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Kannan, Karthik, Mostafa H. Sliem, Aboubakr M. Abdullah, Kishor Kumar Sadasivuni i Bijandra Kumar. "Fabrication of ZnO-Fe-MXene Based Nanocomposites for Efficient CO2 Reduction". Catalysts 10, nr 5 (15.05.2020): 549. http://dx.doi.org/10.3390/catal10050549.
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A ZnO-Fe-MXene nanocomposite was fabricated and examined with diverse spectroscopic techniques. The hexagonal structure of ZnO, MXene, and ZnO-Fe-MXene nanocomposites were validated through XRD. FTIR showed the characteristic vibrational frequencies of ZnO and MXene. The micrographs of the SEM showed nanoparticles with a flower-like structure. The electrocatalytic reduction efficiency of ZnO-Fe-MXene nanocomposite was analyzed through cyclic voltammetry and electrochemical impedance spectroscopy methods. The ZnO-Fe-MXene electrode was confirmed to have a high current density of 18.75 mA/cm2 under a CO2 atmosphere. Nyquist plots also illustrated a decrease in the impedance of the ZnO-Fe-MXene layer, indicating fast charge transfer between the Zn and MXene layers. Additionally, this electrochemical study highlights new features of ZnO-Fe-MXene for CO2 reduction.
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Kaur, Daljeet, Amardeep Bharti, Tripti Sharma i Charu Madhu. "Dielectric Properties of ZnO-Based Nanocomposites and Their Potential Applications". International Journal of Optics 2021 (22.07.2021): 1–20. http://dx.doi.org/10.1155/2021/9950202.
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Energy storage devices constitute one of the research areas in recent years. Capacitors are commonly used for the storage of electrical energy. The current research is focusing on not only the improvement in energy density but also the materials which are environment friendly. Polymer composites are known to be technically essential materials owing to their wide range of applications. Enormous research has been devoted to zinc oxide- (ZnO-) based polymer nanocomposites, due to their extraordinary dielectric properties. This review article presents a detailed study of the dielectric properties of ZnO-based nanocomposites. The dielectric constant study includes the effect of transition metals and rare earth metals as a dopant in ZnO. This review gives an insight into the mechanism responsible for the variation of dielectric constant in ZnO nanocomposites due to various factors like size of nanoparticles, thickness of the thin film, operating frequency, doping concentration, and atomic number. The observations have been summarized to convey the mechanism and structural changes involved in the ZnO nanocomposites to the researchers. The deployment of biodegradable nanocomposite materials is expected to open an innovative way for their outstanding electronic applications as storage materials.
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Su, Li Fen, Lei Miao i Sakae Tanemura. "ZnO/SiO2 Nanocomposite Cryogels Prepared by Vacuum Freeze Drying". Materials Science Forum 663-665 (listopad 2010): 1242–46. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.1242.
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In recent years, ZnO/SiO2 nanocomposite thin films have attracted much attention for a wide range of device applications based on their specific optical and electrical properties. Traditionally, the ZnO/SiO2 nanocomposites were prepared at the form of thin film because the ZnO/SiO2 nanocomposite gels are difficult to synthesize. Therefore, in the present study, a novel route of the mixed ZnO/SiO2 nanocomposite cryogels were prepared by sol-gel technology and dried by vacuum freeze drying. The wet gels were synthesized by co-precursor method with the precursors containing tetraethoxysilane [Si(OC2H5)4,TEOS] and zinc acetate [Zn(CH3COO)2.2H2O]. After vacuum freeze drying, the nanocomposites were annealed at different temperature. The properties of the resulting ZnO/SiO2 nanocomposite cryogels were characterized using Scanning Electron Microscopy (SEM), nitrogen absorption/desorption isotherms, thermogravimetric and differential scanning calorimeter (TG-DSC).
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Al Haiqi, Omer, Abdurahman Hamid Nour, Bamidele Victor Ayodele i Rushdi Bargaa. "Interaction Effect of Process Variables on Solar-Assisted Photocatalytic Phenol Degradation in Oilfield Produced Water Over ZnO/Fe2O3 Nanocomposites". Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 78, nr 1 (1.12.2020): 100–121. http://dx.doi.org/10.37934/arfmts.78.1.100121.
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This study investigates the interaction effects of process variables on photocatalytic phenol degradation in oil produce water. A series of ZnO/Fe2O3 nanocomposite prepared using the sol-gel method and calcined at a temperature range of 400-600 oC were employed as photocatalysts. The characterization analysis using different instrument techniques revealed that the ZnO/Fe2O3 nanocomposites have suitable physicochemical properties as photocatalysts. The photocatalytic activity of the ZnO/Fe2O3 nanocomposite was examined in photo-reactor considering the degradation of the phenol and the reduction in chemical oxygen demand (COD) in the oilfield produced water under direct sunlight. It was ascertained that process variables such as irradiation time, calcination temperature of the ZnO/Fe2O3 nanocomposites, and the ZnO/Fe2O3 nanocomposites concentration significantly influenced the chemical oxygen demand and phenol removal. Based on the analysis of variance (ANOVA), the effects of the process variables on the phenol and COD removal can be ranked as irradiation time (p-value < 0.0001) > calcination temperature of the ZnO/Fe2O3 nanocomposite (p-value = 0.0003) > ZnO/Fe2O3 concentration (p-value = 0.0013). The interaction between the parameters was observed to have a substantial effect on COD and phenol removal. However, the interaction effect that produced the most significant influence on the COD and phenol removal was recorded between the irradiation time and the ZnO/Fe2O3 nanocomposite concentration.
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Fakoori, Elham, Hassan Karami i Azizollah Nezhadali. "Synthesis and characterization of binary and ternary nanocomposites based on TiO2, SiO2 and ZnO with PVA based template-free gel combustion method". Materials Science-Poland 37, nr 3 (1.09.2019): 426–36. http://dx.doi.org/10.2478/msp-2019-0051.
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AbstractBinary and ternary nanocomposites based on TiO2, SiO2 and ZnO were synthesized by PVA-based template-free gel combustion method. The morphology and the particles sizes of the synthesized samples depended on some parameters including the initial concentrations of metal salts and PVA amount in the sol, solvent composition and solution pH. Effects of these parameters were investigated and optimized by using the Taguchi method. In the experimental design, the Taguchi L25 array was used to investigate six factors at five levels. The samples were characterized by dynamic light scattering (DLS), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) specific surface areas, scanning electron microscopy (SEM). The obtained results showed that the present method can be used to synthesize TiO2/SiO2/ZnO ternary nanocomposite with an effective surface area of 0.3 m2 · g−1 and ZnO/TiO2, TiO2/SiO2, ZnO/SiO2 binary nanocomposites with an effective surface area of 234 m2 · g−1, 6 m2 · g−1 and 0.5 m2 · g−1, respectively. The ZnO/TiO2 nanocomposite which was synthesized under the following experimental conditions: 2.5 wt.% Zn salt, 2.5 wt.% Ti salt, 2.0 wt.% PVA, pH = 1 and ethanol:water ratio 30:70 was selected by the Taguchi method as an optimum sample with the smallest particles (average diameter = 50 nm).
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Farha, Ashraf H., Abdullah F. Al Naim i Shehab A. Mansour. "Thermal Degradation of Polystyrene (PS) Nanocomposites Loaded with Sol Gel-Synthesized ZnO Nanorods". Polymers 12, nr 9 (27.08.2020): 1935. http://dx.doi.org/10.3390/polym12091935.
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Thermal degradation of polystyrene/ZnO (PS/ZnO) nanocomposites was investigated in this study. PS/ZnO polymer nanocomposites were prepared by using ZnO nanorods as nanofillers that were prepared via the sol-gel route. The as-prepared ZnO nanoparticles showed nanocrystallites in rod-like shapes with a non-uniform hexagonal cross-section and diameter varying from 40 to 75 nm. PS/ZnO nanocomposites with ZnO nanoparticles content ranging from 0–3 wt% are prepared via the common casting method. Even dispersion for ZnO nanoparticles within as-prepared PS/ZnO nanocomposites was verified through SEM/EDX measurements. Thermal degradation of the samples was checked by using the thermogravimetric (TG) analysis and differential scanning calorimetry (DSC) under non-isothermal conditions and a constant heating rate of 10 °C min. The thermal stability of the nanocomposite is elevated compared to that of pristine PS due to the addition of the ZnO nanoparticles. The homogeneity of the PS/ZnO nanocomposites is verified by systematic increases in thermal degradation with increasing ZnO content. The characterization degradation temperatures at different weight loss percentages of ZnO nanoparticles increase at high ZnO wt%. Static activation energy of decomposing is based on TGA data. Activation energies showed some enhancement after the addition of ZnO nanorods into the PS matrix. Enhancing the thermal stability of PS with ZnO addition within the investigated ZnO concentration range is verified by TG, DSC results.
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Miao, Yuxin, Guofeng Pan, Caixuan Sun, Ping He, Guanlong Cao, Chao Luo, Li Zhang i Hongliang Li. "Enhanced photoelectric responses induced by visible light of acetone gas sensors based on CuO-ZnO nanocomposites at about room temperature". Sensor Review 38, nr 3 (18.06.2018): 311–20. http://dx.doi.org/10.1108/sr-08-2017-0158.
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PurposeThe purpose of this paper is to study the effect of doping, annealing temperature and visible optical excitation on CuO-ZnO nanocomposites’ acetone sensing properties and introduce an attractive candidate for acetone detection at about room temperature.Design/methodology/approachZnO nanoparticles doped with CuO were prepared by sol-gel method, and the structure and morphology were characterized via X-ray diffraction, scanning electron microscope, energy dispersive spectroscopy and Brunauer-Emmett-Teller. The photoelectric responses of CuO-ZnO nanocomposites to cetone under the irradiation of visible light were investigated at about 30°C. The photoelectric response mechanism was also discussed with the model of double Schottky.FindingsThe doping of CuO enhanced performance of ZnO nanoparticles in terms of the photoelectric responses and the gas response and selectivity to acetone of ZnO nanoparticles, in addition, decreasing the operating temperature to about 30ºC. The optimum performance was obtained by 4.17% CuO-ZnO nanocomposites. Even at the operating temperature, about 30ºC, the response to 1,000 ppm acetone was significantly increased to 579.24 under the visible light irradiation.Practical implicationsThe sensor fabricated by 4.17% CuO-ZnO nanocomposites exhibited excellent acetone-sensing characteristics at about 30ºC. It is promising to be applied in low power and miniature acetone gas sensors.Originality/valueIn the present research, a new nanocomposite material of CuO-ZnO was prepared by Sol-gel method. The optimum gas sensing properties to acetone were obtained by 4.17% CuO-ZnO nanocomposites at about 30ºC operating temperature when it was irradiated by visible light with the wavelength more than 420 nm.
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Alkaim, Ayad F., Firas H. Abdulrazzak, Shaimaa M. Essa, Usama S. Altimari, Montather F. Ramadan i Aseel M. Aljeboree. "Methacrylic Acid-Acrylamide based ZnO Hydrogel Nanocomposite Assisted Photocatalytic Decolorization of Methylene Blue Dye". INTERNATIONAL JOURNAL OF PHARMACEUTICAL QUALITY ASSURANCE 14, nr 02 (25.06.2023): 279–82. http://dx.doi.org/10.25258/ijpqa.14.2.06.
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In this research, preparation of methacrylic acid-acrylamide based ZnO hydrogel nanocomposite (MAA-AM)/ZnO hydrogel nanocomposite by way of co-polymerization via used acrylate acid (AA) (or acrylate salt) (AA) or methacrylic acid (MAA)) and acrylamide (AM). Nanocomposites based on acrylate are characterized via being hydrophilic and able to retain water. Nanocomposite properties were studied using different techniques (FE-SEM, TEM, and EDX). The photocatalytic degradation of methylene blue MB dye under different conditions was studied using nanocomposite like time of irradiation, mass of catalyst (MAA- AM)/ZnO hydrogel nanocomposite, initial MB dye concentration onto photocatalytic degradation and reactivation were studied. The result increases the photocatalytic degradation with the rise weight of catalyst (MAA- AM)/ZnO hydrogel nanocomposite range (0.1–0.25 g). Too, a decrease in photocatalytic degradation was observed with an increase in MB. Observed that after reuse, ((MAA- AM)/ZnO) nanocomposite hydrogel appear photocatalytic efficiency from of the use 1 to 6 cycle 87.88 to 58.87%, showing that ((MAA- AM)/ZnO hydrogel nanocomposite surface appear good stability.
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Venkidusamy, Vasanthi, Sivanantham Nallusamy, Gopalakrishnan Nammalvar, Ramakrishnan Veerabahu, Arun Thirumurugan, Chidhambaram Natarajan, Shanmuga Sundar Dhanabalan, Durga Prasad Pabba, Carolina Venegas Abarzúa i Sathish-Kumar Kamaraj. "ZnO/Graphene Composite from Solvent-Exfoliated Few-Layer Graphene Nanosheets for Photocatalytic Dye Degradation under Sunlight Irradiation". Micromachines 14, nr 1 (12.01.2023): 189. http://dx.doi.org/10.3390/mi14010189.
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ZnO/graphene nanocomposites were prepared using a facile approach. Graphene nanosheets were prepared by ultrasonication-based liquid phase exfoliation of graphite powder in a low boiling point organic solvent, 1,2-Dichloroethane, for the preparation of ZnO/graphene nanocomposites. Structural properties of the synthesized ZnO/graphene nanocomposites were studied through powder XRD and micro-Raman analysis. The characteristic Raman active modes of ZnO and graphene present in the micro-Raman spectra ensured the formation of ZnO/graphene nanocomposite and it is inferred that the graphene sheets in the composites were few layers in nature. Increasing the concentration of graphene influenced the surface morphology of the ZnO nanoparticles and a flower shape ZnO was formed on the graphene nanosheets of the composite with high graphene concentration. The efficiencies of the samples for the photocatalytic degradation of Methylene Blue dye under sunlight irradiation were investigated and 97% degradation efficiency was observed. The stability of the nanocomposites was evaluated by performing five cycles, and 92% degradation efficiency was maintained. The observed results were compared with that of ZnO/graphene composite derived from other methods.
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Morici, Elisabetta, Rossella Arrigo i Nadka Tz Dintcheva. "On the role of multi-functional polyhedral oligomeric silsesquioxane in polystyrene-zinc oxide nanocomposites". Journal of Polymer Engineering 35, nr 4 (1.05.2015): 329–37. http://dx.doi.org/10.1515/polyeng-2014-0212.
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Abstract Multi-functional trisilanol phenyl (TSPH) and trisilanol isobutyl (TSIB) polyhedral oligomeric silsesquioxane (POSS) have been used in the formulation of advanced polystyrene (PS)-zinc oxide (ZnO) nanocomposites. The neat matrix and PS/ZnO-based nanocomposites have been characterized through rheological, morphological, mechanical, and dynamic thermo-mechanical analysis. Both TSPH and TSIB are able to improve the dispersion of ZnO into the polystyrene matrix; furthermore, adding TSIB leads to better results because it facilitates better solubility into the PS matrix and interaction/reaction with the ZnO nanopowder. Finally, the optical properties and photo-oxidative resistance of the nanocomposite films have been evaluated. The POSS molecules synergistically interact with ZnO nanopowder in the protection of PS matrix against photo-oxidative process. The nanocomposite films containing both ZnO and POSS molecules, particularly TSIB, exhibit better UV-shielding properties than the PS/ZnO one, without loss of optical transparency.
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Arvanagh, Farid Mohammadi, Abolfazl Bayrami Masoumabad, Aziz Habibi Yangjeh, Mahdi Bayrami, Solmaz Feizpoor, Mohammad Reza Nourani i Ramezan Ali Taheri. "Anti-inflammatory and collagenation effects of zinc oxide-based nanocomposites biosynthesised with Mentha longifolia leaf extract". Journal of Wound Care 32, nr 1 (2.01.2023): 44–54. http://dx.doi.org/10.12968/jowc.2023.32.1.44.
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Objective: The integration of nanomaterials and herbal medicine has led to the design of new nanocomposites, which are therapeutically more effective. The purpose of this study was to prepare different zinc oxide (ZnO)-based nanoparticles (NPs) via Mentha longifolia extract based on gauze linen fibre and study its effects on wound healing. Methods: The textural properties, morphology, thermal stability, purity, spectroscopic and phase structure of nanoparticles were investigated. Subsequently, male Wistar rats were subjected to wounds in six different treatment groups: Group I: control; group II: ZnO/W prepared in water (W); group III: ZnO/M synthesised with Mentha longifolia (M) extract; group IV: ZnO/copper(II) oxide (CuO)/M nanocomposite synthesised with M extract; group IV: treated with ZnO/silver (Ag)/M nanocomposite; group V: treated with ZnO/Ag/M nanocomposite; and finally, group VI: treated with ZnO/CuO/Ag/M nanocomposite. In all groups, the wounds were treated for 21 days with prepared samples. Every seven days, after measuring the decreasing rate of the wound size, tissue samples from each group were taken for histopathological analysis. The prepared tissue sections were assessed by haematoxylin and eosin staining for the formation of the epidermis, dermis and muscular tissue, and Masson's Trichrome staining for the formation of collagen fibres. Results: The results showed that the ZnO/CuO/Ag/M nanocomposite was a significantly more effective wound healing material in comparison with other samples (p<0.05). Conclusion: In this study, the integration of ZnO/CuO/Ag nanocomposites with secondary metabolites of Mentha longifolia gave rise to a superior combination, which could support different phases of wound healing via the regulation of cytokines and growth factors in the course of healing.
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Yaqoob, Asim Ali, Nur Habibah binti Mohd Noor, Albert Serrà i Mohamad Nasir Mohamad Ibrahim. "Advances and Challenges in Developing Efficient Graphene Oxide-Based ZnO Photocatalysts for Dye Photo-Oxidation". Nanomaterials 10, nr 5 (12.05.2020): 932. http://dx.doi.org/10.3390/nano10050932.
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The efficient remediation of organic dyes from wastewater is increasingly valuable in water treatment technology, largely owing to the tons of hazardous chemicals currently and constantly released into rivers and seas from various industries, including the paper, pharmaceutical, textile, and dye production industries. Using solar energy as an inexhaustible source, photocatalysis ranks among the most promising wastewater treatment techniques for eliminating persistent organic pollutants and new emerging contaminants. In that context, developing efficient photocatalysts using sunlight irradiation and effectively integrating them into reactors, however, pose major challenges in the technologically relevant application of photocatalysts. As a potential solution, graphene oxide (GO)-based zinc oxide (ZnO) nanocomposites may be used together with different components (i.e., ZnO and GO-based materials) to overcome the drawbacks of ZnO photocatalysts. Indeed, mounting evidence suggests that using GO-based ZnO nanocomposites can promote light absorption, charge separation, charge transportation, and photo-oxidation of dyes. Despite such advances, viable, low-cost GO-based ZnO nanocomposite photocatalysts with sufficient efficiency, stability, and photostability remain to be developed, especially ones that can be integrated into photocatalytic reactors. This article offers a concise overview of state-of-the-art GO-based ZnO nanocomposites and the principal challenges in developing them.
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Astuti, Astuti, Syukri Arief i Devi Pebrina. "Effect of the Amount of Carbon in the Fe3O4@ZnO-C Nanocomposites on Its Structure and Magnetic Properties". Jurnal Kimia Sains dan Aplikasi 25, nr 10 (23.12.2022): 362–67. http://dx.doi.org/10.14710/jksa.25.10.362-367.
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Synthesis and characterization of structure magnetic properties of Fe3O4@ZnO- C nanocomposite have been done through the precipitation method. This study aimed to discover the effect of concentrations/thickness of carbon layer on crystal structure and magnetic properties of Fe3O4@ZnO-C nanocomposites. Fe3O4 and Fe3O4@ZnO were the samples used in the study, and variations in the amount of carbon were 0.2, 0.1, and 0.05 g. Nanocomposites were characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and vibrating sample magnetometer (VSM). Based on the results of XRD, it has been found that the crystal structure for Fe3O4 was cubic, while ZnO was hexagonal wurtzite. The addition of carbons to Fe3O4@ZnO caused a broadening of the diffraction peaks and a decrease in the degree of crystallinity. The bonds formed on Fe3O4@ZnO-C nanocomposites, i.e. Fe-O bonds indicated the formation of Fe3O4, Zn-O bonds showed the formation of ZnO and C-O, C-H, and O-H bonds revealed the presence of a carbon layer originated from glucose. The VSM results showed that the magnetic saturation decreased with increasing carbon mass. Overall, the carbon-coated nanocomposite material with a carbon mass variation of 0.2, 0.1, and 0.05 g showed superparamagnetic properties with a magnetic saturation of 18.23 emu/g, 19.33 emu/g and 22.05 emu/g, while for the coercive field of 92.29 Oe, 92.90 Oe and 89.60 Oe, respectively. Based on these characterization results, Fe3O4@ZnO-C nanocomposite materials can potentially be developed as biomedical materials, such as the materials for photothermal therapy for cancer cells.
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Anandhi, P., V. Jawahar Senthil Kumar i S. Harikrishnan. "Improved electrochemical behavior of metal oxides-based nanocomposites for supercapacitor". Functional Materials Letters 12, nr 05 (17.09.2019): 1950064. http://dx.doi.org/10.1142/s1793604719500644.
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This paper investigates the synthesis and enhanced electrochemical behaviors of ZnO and NiO/ZnO nanocomposites for electrode material of supercapacitors. ZnO and NiO/ZnO nanocomposites were produced via sol–gel technique. Transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM) were used to determine the size and structure of as-synthesized nanomaterials, respectively. The capacitive behavior and charge–discharge characteristics of the electrode using ZnO and NiO/ZnO nanocomposites (as active material) were individually probed with the help of cyclic voltammetry (CV) and galvanostatic charge-discharge tests, respectively. The specific capacitance of nanocomposites-based electrode calculated from galvanostatic charge-discharge tests was 469[Formula: see text]F [Formula: see text] at the scan rate of 1[Formula: see text]mA [Formula: see text] in 1M Na2SO4 electrolyte. The power density and energy density at the current density of 1[Formula: see text]mA [Formula: see text] were determined as 1458.33[Formula: see text]W [Formula: see text] and 91.14[Formula: see text]Wh[Formula: see text][Formula: see text], respectively. Hence, NiO/ZnO nanocomposites could be reckoned to be a promising electrode material for supercapacitor while comparing to ZnO-based electrode material.
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Hudika, Tomislav, Nevijo Zdolec, Marta Kiš i Tomislav Cigula. "Providing Antimicrobial Properties to Cardboard Food Packaging by Coating with ZnO, TiO2, and SiO2—Water-Based Varnish Nanocomposites". Processes 10, nr 11 (4.11.2022): 2285. http://dx.doi.org/10.3390/pr10112285.
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Packaging acts like a bond between visual communication and production technology. Packaging material is often coated to enhance visual appearance and some protective features. The COVID pandemic changed consumers’ behavior and understanding of the importance regarding the antimicrobial properties of goods that come in contact with hands. The aim of this research is to investigate and determine the antimicrobial properties of nanocomposite coatings which include nanosized zinc oxide (ZnO), titanium dioxide (TiO2), and silicon dioxide (SiO2). For the purpose of this research, a lithographic printed packaging was coated with a nanocomposite composed of flexographic water-based varnish with incorporated ZnO, TiO2, and SiO2 nanosized particles. A total of eight modulations were presented and compared to the lone water-based varnish. The results have shown that applying nanocomposites will increase the total surface free energy of the packaging surface but will decrease the polar component of the surface free energy leading to lower hydrophilic properties. Both nanocomposite types showed that the increase in the nanoparticle weight ratio leads to higher protection benefits. Nanocomposites with ZnO have better antimicrobial activity than the ones with TiO2. The Hybrid/Z (ZnO + SiO2) significantly improved the antimicrobial capacity of water-based varnish, primarily against the ubiquitous foodborne pathogen Listeria monocytogenes.
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Hui, Aiping, Fangfang Yang, Rui Yan, Yuru Kang i Aiqin Wang. "Palygorskite-Based Organic–Inorganic Hybrid Nanocomposite for Enhanced Antibacterial Activities". Nanomaterials 11, nr 12 (28.11.2021): 3230. http://dx.doi.org/10.3390/nano11123230.
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A synergistic antibacterial strategy is effective in enhancing the antibacterial efficacy of a single antibacterial material. Plant essential oils (PEOs) are safe antibacterial agents. However, some of their characteristics such as intense aroma, volatility, and poor thermal stability limit their antibacterial activity and applications. In this paper, five kinds of PEOs were incorporated onto ZnO/palygorskite (ZnO/PAL) nanoparticles by a simple adsorption process to form organic–inorganic nanocomposites (PEOs/ZnO/PAL) with excellent antibacterial properties. TEM and SEM analyses demonstrated that ZnO nanoparticles uniformly anchored onto the surface of rod-like PAL, and that the structure of ZnO/PAL maintained after the incorporation of ZnO nanoparticles and PEOs. It was found that carvacrol/ZnO/palygorskite (CAR/ZnO/PAL) exhibited higher antibacterial activities than other PEOs/ZnO/PAL nanocomposites, with minimum inhibitory concentration (MIC) values of 0.5 mg/mL and 1.5 mg/mL against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), respectively. Moreover, the antibacterial efficiency of CAR/ZnO/PAL nanocomposites was superior to that of ZnO/PAL and pure CAR, demonstrating the synergistic effect that occurs in the combined system. PAL serving as a carrier for the combination of organic PEOs and ZnO nanoparticles is an effective strategy for enhanced, clay-based, organic–inorganic hybrid antibacterial nanocomposites.
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Alamgeer, Muhammad Tahir, Mahidur R. Sarker, Shabina Ali, Ibraheem, Shahid Hussian, Sajad Ali i in. "Polyaniline/ZnO Hybrid Nanocomposite: Morphology, Spectroscopy and Optimization of ZnO Concentration for Photovoltaic Applications". Polymers 15, nr 2 (10.01.2023): 363. http://dx.doi.org/10.3390/polym15020363.
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The appropriate combination of semiconducting polymer–inorganic nanocomposites can enhance the existing performance of polymers-only-based photovoltaic devices. Hence, polyaniline (PANI)/zinc oxide (ZnO) nanocomposites were prepared by combining ZnO nanoparticles with PANI in four distinct ratios to optimize their photovoltaic performance. Using a simple coating method, PANI, ZnO, and its nanocomposite, with varying weight percent (wt%) concentrations of ZnO nanoparticles, i.e., (1 wt%, 2 wt%, 3 wt%, and 4 wt%), were fabricated and utilized as an active layer to evaluate the potential for the high-power conversion efficiency of various concentrations, respectively. PANI/ZnO nanocomposites are characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), atomic force microscopy (AFM), Fourier transform infrared (FTIR) spectroscopy, ultraviolet-visible (UV-vis) absorption, energy dispersive X-ray (EDX), and I-V measurement techniques. The XRD analysis showed a distinct, narrow peak, which corresponds to the wurtzite ZnO (101) plane. The SEM analysis verified the production of the PANI/ZnO composite by demonstrating that the crystalline ZnO was integrated into the PANI matrix. The elemental composition was determined by energy dispersive X-ray analysis (EDX), which confirmed the existence of PANI and ZnO without any impurities, respectively. Using Fourier transform infrared (FTIR) spectroscopy, various chemical bonds and stretching vibrations were analyzed and assigned to different peaks. The bandgap narrowing with an increasing PANI/ZnO composition led to exceptional optical improvement. The I-V characterization was utilized to investigate the impact of the nanocomposite on the electrical properties of the PANI/ZnO, and various concentrations of ZnO (1 wt%, 2 wt%, 3 wt%, and 4 wt%) in the PANI matrix were analyzed under both light and dark conditions at an STC of 1.5 AM globally. A high PCE of 4.48% was achieved for the PANI/ZnO (3 wt%), which revealed that the conductivity of the PANI/ZnO nanocomposite thin films improved with the increasing nanocomposite concentration.
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Alhogbi, Basma G., Ohowd Ibrahim, Mohamed Abdel Salam, Mohammed S. El-Shahawi i Mohammed Aslam. "Facile Preparation and Analytical Utility of ZnO/Date Palm Fiber Nanocomposites in Lead Removal from Environmental Water Samples". Molecules 27, nr 17 (30.08.2022): 5592. http://dx.doi.org/10.3390/molecules27175592.
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This study reports a facile approach for preparing low-cost, eco-friendly nanocomposites of ZnO nanoparticles (NPs) and date palm tree fiber (DPF) as a biomass sorbent. The hypothesis of this research work is the formation of an outstanding adsorbent based on the date palm fiber and ZnO nanoparticles. ZnO NP/DPF nanocomposites were synthesized by mixing the synthesized ZnO NPs and DPF in different mass ratios and evaluating their efficacy in adsorbing Pb2+ from aqueous solutions. The structure and surface morphology of the developed ZnO NP/DPF nanocomposite were critically characterized by XRD, FESEM, and TEM techniques. Compared to ZnO NPs, the ZnO NP/DPF nanocomposites displayed significantly enhanced Pb2+ uptake. Pb2+ adsorption was confirmed via various isotherm and kinetic models and thermodynamics. The computed Langmuir sorption capacity (qm) was found to be 88.76 mg/g (R2 > 0.998), and the pseudo-second-order R2 > 0.999 model was most appropriate for describing Pb2 adsorption. Impregnating the biomass with ZnO NPs enhanced the spontaneity of the process, and the value (−56.55 kJ/mol) of ΔH displayed the exothermic characteristics of Pb2 retention. Only the loaded ZnO NP/DPF achieved the removal of a high percentage (84.92%) of Pb2+ from the environmental water sample (seawater). This finding suggests the use of ZnO NP/DPF nanocomposites for removing heavy metals from environmental water samples to purify the samples.
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Gao, Chenhao, Keyi Zhong, Xuan Fang, Dan Fang, Hongbin Zhao, Dengkui Wang, Bobo Li i in. "Brief Review of Photocatalysis and Photoresponse Properties of ZnO–Graphene Nanocomposites". Energies 14, nr 19 (7.10.2021): 6403. http://dx.doi.org/10.3390/en14196403.
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As a typical wide bandgap semiconductor, ZnO has received a great deal of attention from researchers because of its strong physicochemical characteristics. During the past few years, great progress has been made in the optoelectronic applications of ZnO, particularly in the photocatalysis and photodetection fields. To enable further improvements in the material’s optoelectronic performance, construction of a variety of ZnO-based composite structures will be essential. In this paper, we review recent progress in the growth of different ZnO–graphene nanocomposite structures. The related band structures and photocatalysis and photoresponse properties of these nanocomposites are discussed. Additionally, specific examples of the materials are included to provide an insight into the common general physical properties and carrier transport characteristics involved in these unique nanocomposite structures. Finally, further directions for the development of ZnO–graphene nanocomposite materials are forecasted.
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Astuti, Syukri Arief, Muldarisnur, Zulhadjri i R. A. Usna. "Synthesis and Properties of Magnetic-Luminescent Fe3O4@ZnO/C Nanocomposites". Journal of Nanotechnology 2023 (8.04.2023): 1–7. http://dx.doi.org/10.1155/2023/2381623.
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A Fe3O4@ZnO/C nanocomposite with a core-shell structure was synthesized using the co-precipitation method. To prevent the aggregation of the Fe3O4 magnetic particles, polyethylene glycol (PEG) was added. The X-ray diffractometer (XRD) results confirmed the formation of Fe3O4 and ZnO phases, with Fe3O4 having a cubic crystal system and ZnO having a hexagonal crystal system. Carbon in Fe3O4@ZnO/C had no effect on the crystal structure of Fe3O4@ZnO. Images from transmission electron microscopy (TEM) and scanning electron microscopy (SEM) revealed that the nanocomposite formed a core-shell structure. The Fourier transform infrared (FTIR) spectra verified the presence of bonds among ZnO, Fe3O4, and carbon. The appearance of the stretching vibration of the C≡C bond on the Fe3O4@ZnO/C sample revealed the nanocomposites’ carbon coupling. Photoluminescence (PL) spectroscopy was used to characterize the optical properties of the nanocomposites. Based on the results of the PL, the sample absorption of visible light was in the wavelength range of 400–700 nm. The photoluminescence of Fe3O4@ZnO differed from that of the Fe3O4@ZnO/C, especially in the deep-level emission (DLE) band. There was a phenomenon of broadening and shift of the band at a shorter wavelength, namely, in the blue wavelength region. Magnetic properties were characterized by vibrating-sample magnetometry (VSM). Based on the VSM results, the sample coupled with carbon exhibited a decrease in magnetic saturation. The presence of carbon changed photon energy into thermal energy. So, this material, apart from being a bioimaging material, can also be developed as a photothermal therapy material.
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Sharma, Prashant, Na-Yoon Jang, Jae-Won Lee, Bum Chul Park, Young Keun Kim i Nam-Hyuk Cho. "Application of ZnO-Based Nanocomposites for Vaccines and Cancer Immunotherapy". Pharmaceutics 11, nr 10 (26.09.2019): 493. http://dx.doi.org/10.3390/pharmaceutics11100493.
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Engineering and application of nanomaterials have recently helped advance various biomedical fields. Zinc oxide (ZnO)-based nanocomposites have become one of the most promising candidates for biomedical applications due to their biocompatibility, unique physicochemical properties, and cost-effective mass production. In addition, recent advances in nano-engineering technologies enable the generation of ZnO nanocomposites with unique three-dimensional structures and surface characteristics that are optimally designed for in vivo applications. Here, we review recent advances in the application of diverse ZnO nanocomposites, with an especial focus on their development as vaccine adjuvant and cancer immunotherapeutics, as well as their intrinsic properties interacting with the immune system and potential toxic effect in vivo. Finally, we summarize promising proof-of-concept applications as prophylactic and therapeutic vaccines against infections and cancers. Understanding the nano-bio interfaces between ZnO-based nanocomposites and the immune system, together with bio-effective design of the nanomaterial using nano-architectonic technology, may open new avenues in expanding the biomedical application of ZnO nanocomposites as a novel vaccine platform.
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Zsirka, Balázs, Veronika Vágvölgyi, Erzsébet Horváth, Tatjána Juzsakova, Orsolya Fónagy, Erzsébet Szabó-Bárdos i János Kristóf. "Halloysite-Zinc Oxide Nanocomposites as Potential Photocatalysts". Minerals 12, nr 4 (13.04.2022): 476. http://dx.doi.org/10.3390/min12040476.
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The synthesis and structural characterization of synthetic zinc oxide and halloysite-based zinc oxide nanocomposites (with 2–28 m/m% ZnO content) are presented. The chemical precipitation of zinc hydroxide precursors and its subsequent drying at 80 °C yielded dominantly zinc oxide (zincite). Thermal treatment at 350 °C completely transformed the remaining precursor to ZnO without causing structural dehydroxylation of the halloysite support. The procedure yielded zinc oxide nanoparticles with 10–22 nm average size having quasi-spherical scale-like morphology. The specific surface area of the synthetic zinc oxide was found to be low (13 m2/g), which was significantly enhanced after nanocomposite preparation (27–47 m2/g). The photocatalytic activity of the prepared nanocomposites was probed by the degradation of a phenolic compound (4-nitrophenol) upon UV irradiation in liquid phase. Compared to their individual constituents, an increased activity of the nanocomposites was observed, while the SSA-normalized photocatalytic activity revealed a synergic effect in nanocomposites above 9 m/m% ZnO content. The nanocomposites were found to be stable at pH = 5.6, with a minor and major mobilization of zinc ions at pH = 12.4 and pH = 1.9, respectively. The toxicity of leachates in different pH environments by Vibrio fischeri bioluminescence indicated low toxicity for ZnO nanoparticles and insignificant toxicity for the nanocomposites. The enhanced photocatalytic activity together with the lower toxicity of the halloysite-ZnO nanocomposites highlight their application potential in water treatment.
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Han, Lei, Wen Li, Chao Meng, Yan Chen i Shan Fan. "Charge transport mechanism of polyaniline/ZnO nanocomposites based on inorganic/organic heterojunctions". MATEC Web of Conferences 179 (2018): 02005. http://dx.doi.org/10.1051/matecconf/201817902005.
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The key to improve the photocurrent is how to promote the generation rate and reduce the recombination rate of the photo-hole pair. In this paper, a p-n heterjunction structure in Polyaniline (PANI)/ZnO nanocomposites was formed via mechanical mixing process. Compared with ZnO, PANI doped ZnO nanocomposites exhibit obviously enhanced response. It might be attributed to the p-n heterojunctions formed between p-type and n-type enhanced response, enhancing the charge separation and in turn promoting the photoconductivity of the film. The 5at-%PANI doped ZnO nanocomposites demonstrates the highest response.
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Supramaniam, Janarthanan, Darren Yi Sern Low, See Kiat Wong, Loh Teng Hern Tan, Bey Fen Leo, Bey Hing Goh, Dazylah Darji i in. "Facile Synthesis and Characterization of Palm CNF-ZnO Nanocomposites with Antibacterial and Reinforcing Properties". International Journal of Molecular Sciences 22, nr 11 (28.05.2021): 5781. http://dx.doi.org/10.3390/ijms22115781.
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Cellulose nanofibers (CNF) isolated from plant biomass have attracted considerable interests in polymer engineering. The limitations associated with CNF-based nanocomposites are often linked to the time-consuming preparation methods and lack of desired surface functionalities. Herein, we demonstrate the feasibility of preparing a multifunctional CNF-zinc oxide (CNF-ZnO) nanocomposite with dual antibacterial and reinforcing properties via a facile and efficient ultrasound route. We characterized and examined the antibacterial and mechanical reinforcement performances of our ultrasonically induced nanocomposite. Based on our electron microscopy analyses, the ZnO deposited onto the nanofibrous network had a flake-like morphology with particle sizes ranging between 21 to 34 nm. pH levels between 8–10 led to the formation of ultrafine ZnO particles with a uniform size distribution. The resultant CNF-ZnO composite showed improved thermal stability compared to pure CNF. The composite showed potent inhibitory activities against Gram-positive (methicillin-resistant Staphylococcus aureus (MRSA)) and Gram-negative Salmonella typhi (S. typhi) bacteria. A CNF-ZnO-reinforced natural rubber (NR/CNF-ZnO) composite film, which was produced via latex mixing and casting methods, exhibited up to 42% improvement in tensile strength compared with the neat NR. The findings of this study suggest that ultrasonically-synthesized palm CNF-ZnO nanocomposites could find potential applications in the biomedical field and in the development of high strength rubber composites.
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Lei, Gaiying, Shu Yang, Ranran Cao, Peng Zhou, Han Peng, Rui Peng, Xiaoming Zhang i in. "In Situ Preparation of Amphibious ZnO Quantum Dots with Blue Fluorescence Based on Hyperbranched Polymers and their Application in Bio-Imaging". Polymers 12, nr 1 (6.01.2020): 144. http://dx.doi.org/10.3390/polym12010144.
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A new strategy for preparing amphibious ZnO quantum dots (QDs) with blue fluorescence within hyper-branched poly(ethylenimine)s (HPEI) was proposed in this paper. By changing [Zn2+]/[OH−] molar ratio and heating time, ZnO QDs with a quantum yields (QY) of 30% in ethanol were obtained. Benefiting from the amphibious property of HPEI, the ZnO/HPEI nanocomposites in ethanol could be dissolved in chloroform and water, acquiring a QY of 53%, chloroform and 11% in water. By this strategy, the ZnO/HPEI nano-composites could be applied in not only in optoelectronics, but also biomedical fields (such as bio-imaging and gene transfection). The bio-imaging application of water-soluble ZnO/HPEI nanocomposites was investigated and it was found that they could easily be endocytosed by the COS-7 cells, without transfection reagent, and they exhibited excellent biological imaging behavior.
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Pyrz, Ryszard. "Optical and Piezoelectric Properties of ZnO Nanowires and Functional Polymer-Based Nanocomposites". Advanced Materials Research 32 (luty 2008): 107–10. http://dx.doi.org/10.4028/www.scientific.net/amr.32.107.
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Molecular dynamics simulations are employed to study electronic and mechanical properties of smallest ZnO nanowires. It has been shown that the electronic band structure of nanowires varies with uniaxial strain and this property can be used for sensing deformation state when nanowires are embedded in a polymer matrix. A new atomic strain concept is formulated that allows calculation of continuum quantities directly within a discrete atomic (molecular) system. Molecular modeling and strain calculations have been performed on ZnO/polypropylene nanocomposites and compared with a carbon nanotube/polypropylene system. The simulation cell of nanocomposite has been subjected to uniaxial tension along an inclusion axis and the analysis has been performed for seven deformation steps with equilibration runs after each step. Both nanoinclusions follow global nanocomposite strain to a certain loading and then both exhibit deformation lag as loading level increases. This is clear evidence that both systems are prone to interfacial sliding. The sliding is more significant with the ZnO nanowire as compared to carbon nanotube, which is also evidenced in weaker interaction of this system.
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Ulfawanti Intan Subadra, ST, Ahmad Taufiq, Sunaryono Sunaryono, Arif Hidayat, Nandang Mufti, Hendra Susanto i Muhammad Chair Effendi. "Synthesis and characterisation of Fe3O4/MWCNT/ZnO nanocomposites covered by a soft template as a new antibacterial agent". Advances in Natural Sciences: Nanoscience and Nanotechnology 13, nr 3 (1.09.2022): 035010. http://dx.doi.org/10.1088/2043-6262/ac8de8.
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Abstract This study successfully developed a new antibacterial agent based on Fe3O4/MWCNT/ZnO nanocomposites prepared using diethylamine as a soft template. The prepared samples were characterised using x-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, energy-dispersive x-ray spectroscopy, vibrating sample magnetometry, ultraviolet-visible spectroscopy, and antibacterial tests by the diffusion method. The results of the data analysis showed that Fe3O4/MWCNT/ZnO nanocomposites were composed of Fe3O4, MWCNT, ZnO with inverse cubic spinel, hexagonal, and hexagonal wurtzite structures, respectively. The nanocomposite particles tended to agglomerate and their size decreased with increasing volume of added diethylamine in the range of ∼23–26 nm. The nanocomposites remain stable even after being stored for more than 3 years. The nanocomposites had superparamagnetic properties with saturation magnetisation values of 24 to 31 emu g−1 and band gap values of 2.96 to 2.99 eV. The diameters of the bacterial inhibition zone of the nanocomposites were 12.57–20.38 mm, 14.25–17.25 mm, and 14.63–16.38 mm against E. coli, S. aureus, and B. subtilis, respectively. Therefore, the combination of Fe3O4, MWCNT, ZnO, and diethylamine with natural base materials such as iron sand has good potential to develop new antibacterial agents.
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Elderdery, Abozer Y., Abdulaziz H. Alhamidi, Ahmed M. E. Elkhalifa, Maryam M. Althobiti, Entesar M. A. Tebien, Nawal Eltayeb Omer, Siddiqa M. A. Hamza i in. "Synthesis and characterization of ZnO–TiO2–chitosan–escin metallic nanocomposites: Evaluation of their antimicrobial and anticancer activities". Green Processing and Synthesis 11, nr 1 (1.01.2022): 1026–39. http://dx.doi.org/10.1515/gps-2022-0086.
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Abstract This work intended to formulate bio-nanocomposites of zinc oxide (ZnO), titanium oxide (TiO2), chitosan, and escin, characterize their physical properties, and evaluate their antimicrobial and anticancer properties. X-ray diffractometers (XRD) and scanning and transmission electron microscopes were applied to characterize the morphology and ultrastructure of chemically synthesized bio-nanocomposites. To investigate the functional groups of bio-nanocomposites, we used Perkin–Elmer spectrometers for Fourier transform infrared (FTIR) analysis and photoluminescence (PL) spectroscopy for PL spectrum analysis. Antimicrobial activities against bacterial and fungal strains were tested with agar well diffusion. Bio-nanocomposites were tested for anticancer effects on a MOLT4 blood cancer cell line using morphological analysis, methyl thiazole tetrazolium assay, apoptosis by acridine orange/ethidium bromide, and mitochondrial membrane potential (ΔΨm). In XRD, FTIR, and PL, the active compounds of ZnO–TiO2, chitosan, and escin peaks were observed. Our bio-nanocomposites demonstrated antimicrobial activity against bacterial and fungal pathogens. The bio-nanocomposite was cytotoxic to MOLT4 cells at an IC50 concentration of 33.4 µg·mL−1. Bio-nanocomposites caused cytotoxicity, changes in cell morphology, and mitochondrial membrane potential degradation, all of which resulted in apoptotic cell death. MOLT4 cells were found to be responsive to bio-nanocomposites based on ZnO–TiO2–chitosan–escin.
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Irimpan, Litty, V. P. N. Nampoori i P. Radhakrishnan. "Enhanced luminescence and nonlinear optical properties of nanocomposites of ZnO–Cu". Journal of Materials Research 23, nr 11 (listopad 2008): 2836–45. http://dx.doi.org/10.1557/jmr.2008.0364.
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In this article, we present the spectral and nonlinear optical properties of ZnO–Cu nanocomposites prepared by colloidal chemical synthesis. The emission consisted of two peaks. The 385-nm ultraviolet (UV) peak is attributed to ZnO and the 550-nm visible peak is attributed to Cu nanocolloids. Obvious enhancement of UV and visible emission of the samples is observed and the strongest UV emission of a typical ZnO–Cu nanocomposite is over three times stronger than that of pure ZnO. Cu acts as a sensitizer and the enhancement of UV emission are caused by excitons formed at the interface between Cu and ZnO. As the volume fraction of Cu increases beyond a particular value, the intensity of the UV peak decreases while the intensity of the visible peak increases, and the strongest visible emission of a typical ZnO–Cu nanocomposite is over ten times stronger than that of pure Cu. The emission mechanism is discussed. Nonlinear optical response of these samples is studied using nanosecond laser pulses from a tunable laser in the wavelength range of 450–650 nm, which includes the surface plasmon absorption (SPA) band. The nonlinear response is wavelength dependent and switching from reverse saturable absorption (RSA) to saturable absorption (SA) has been observed for Cu nanocolloids as the excitation wavelength changes from the low absorption window region to higher absorption regime near the SPA band. However, ZnO colloids and ZnO–Cu nanocomposites exhibit induced absorption at this wavelength. Such a changeover in the sign of the nonlinearity of ZnO–Cu nanocomposites, with respect to Cu nanocolloids, is related to the interplay of plasmon band bleach and optical limiting mechanisms. The SA again changes back to RSA when we move over to the infrared region. The ZnO–Cu nanocomposites show self-defocusing nonlinearity and good nonlinear absorption behavior. The nonlinear refractive index and the nonlinear absorption increases with increasing Cu volume fraction at 532 nm. The observed nonlinear absorption is explained through two-photon absorption followed by weak free-carrier absorption and interband absorption mechanisms. This study is important in identifying the spectral range and composition over which the nonlinear material acts as a RSA-based optical limiter. ZnO–Cu is a potential nanocomposite material for the light emission and for the development of nonlinear optical devices with a relatively small limiting threshold.
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Dumitrescu, Lucia, Dana Perniu i Ileana Manciulea. "Nanocomposites Based on Acrylic Copolymer, Iron Lignosulfonate and ZnO Nanoparticles Used as Wood Preservatives". Solid State Phenomena 151 (kwiecień 2009): 139–44. http://dx.doi.org/10.4028/www.scientific.net/ssp.151.139.
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The paper presents research concerning the synthesis and characterization of some new nanocomposite used as wood coating nanomaterials, consisting of a hybrid of organic (functionalized acrylic copolymers with iron lignosulfonate) and inorganic nanomaterials (ZnO nanoparticles obtained by sol-gel process). The presence of acrylic copolymers in water emulsion (based on monomers ethyl acrylate, butyl acrylate, acrylonitrile and the lignin derivative iron lignosulfonate) and ZnO nanoparticles enables the formation of a crosslinked nanometric network of inorganic and organic domains, emphasized by AFM analysis. The interphase characterization of the nanostructured materials synthesized was performed using FT-IR analysis. Considering the biocide activity for the acrylic copolymers, the lignin derivative iron lignosulfonate and ZnO nanoparticles, the obtained nanocomposites were biologically investigated and proposed as wood preservation agents.
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Gorbunova, Marina N., Natalya Borisovna Kondrashova i Andrei Yurievich Ustinov. "Biocide nanocomposite materials on the basis of zinc oxide". Вестник Пермского университета. Серия «Химия» = Bulletin of Perm University. CHEMISTRY 12, nr 2 (2022): 69–77. http://dx.doi.org/10.17072/2223-1838-2022-2-69-77.
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The aim of this work is the synthesis of composite materials based on highly dispersed zinc oxide and the study of the effect of synthesis conditions on their composition and structure. Finely dispersed zinc oxide was prepared by a thermal decomposition of products of ZnCl2 and (NH4)2CO3 interaction. ZnO nanocomposite materials modified by silver were synthesized by chemical and photochemical reduction of silver salts in a zinc oxide matrix. It is shown that, in the case of chemical reduction, Ag/ZnO nanocomposites with an average silver particle size of 22 nm are obtained. When using the photochemical method of reduction of silver ions, the effect of the ratio of components on the morphology of the samples was noted: at a ratio of ZnO:AgNO3:NaCl - 1:0.5:0.5, the formation of Ag/AgCl/ZnO nanocomposites is observed, with an increase in the silver salt content, the formation of silver nanoparticles is not observed, and AgCl/ZnO nanocomposites are formed. The high bactericidal activity of Ag/ZnО was shown.
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Cursaru, Laura-Madalina, Sorina Nicoleta Valsan, Maria-Eliza Puscasu, Ioan Albert Tudor, Nicoleta Zarnescu-Ivan, Bogdan Stefan Vasile i Roxana Mioara Piticescu. "Study of ZnO-CNT Nanocomposites in High-Pressure Conditions". Materials 14, nr 18 (15.09.2021): 5330. http://dx.doi.org/10.3390/ma14185330.
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Recently, carbon nanotubes (CNTs) have been used extensively to develop new materials and devices due to their specific morphology and properties. The reinforcement of different metal oxides such as zinc oxide (ZnO) with CNT develops advanced multifunctional materials with improved properties. Our aim is to obtain ZnO-CNT nanocomposites by in situ hydrothermal method in high-pressure conditions. Various compositions were tested. The structure and morphology of ZnO-CNT nanocomposites were analyzed by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry—thermogravimetry (DSC-TG), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and transmission electron microscopy (TEM). These analyses showed the formation of complex ZnO-CNT structures. FT-IR spectra suggest possible interactions between CNT and ZnO. DSC-TG analysis also reveals the formation of some physical bonds between ZnO and CNT, through the appearance of endothermic peaks which could be assigned to the decomposition of functional groups of the CNT chain and breaking of the ZnO-CNT bonds. XRD characterization demonstrated the existence of ZnO nanocrystallites with size around 60 nm. The best ZnO:CNT composition was further selected for preliminary investigations of the potential of these nanocomposite powders to be processed as pastes for extrusion-based 3D printing.
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Burunkova, J. A., I. Yu Denisyuk i S. A. Semina. "Self-Organization of ZnO Nanoparticles on UV-Curable Acrylate Nanocomposites". Journal of Nanotechnology 2011 (2011): 1–6. http://dx.doi.org/10.1155/2011/951036.
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Our work focused on synthesis and investigation of nanoparticles role in structuring of homogenous nanocomposite based on ZnO nanoparticles in UV-curable monomers mixture. Due to strong interaction between nanoparticles surface and polymerizable carboxylic acid, nanoparticles were distributed homogeneously, and density of nanocomposite increased also in comparison with pure polymer matrix. Light scattering, plasticity, and water sorption non-monotonically depends on the concentration of nanoparticles concentration. UV-curable active matrix polymerization on the surface of ZnO nanoparticles was investigated using IR spectroscopy. The set of structural modifications of polymeric nanocomposites were observed by ASM, light scattering, Brinell hardness, and water sorption.Suggestions that the nanoparticles in the polymerization process play the role of photocatalysts and provide structuring effect on the nanocomposite were discussed.
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D. HUSSEIN, Amel. "FABRICATION SENSORS BASED ON NANOCOMPOSITES ZnO/PVDF". MINAR International Journal of Applied Sciences and Technology 04, nr 03 (1.09.2022): 123–28. http://dx.doi.org/10.47832/2717-8234.12.13.
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This paper focused on generated output voltage by converting the mechanical energy to electrical response piezoelectric output voltage by tapping the finger of the hand on flexible nanogenerators fabrication of nanocomposites fibers (zinc oxide/polyvinylidene fluoride) ZnO/PVDF. Since, zinc oxide nanostructured materials have unique properties as their nanostructures, semiconducting, and piezoelectric which synthesize practically simply by a hydrothermal process at low temperatures. The structure and morphology of reactant materials, and, the fabricated nanofibers of the nanocomposites are characterized by XRD and SEM. The output is measured by an oscilloscope. The maximum output piezoelectric voltage for 18%ZnO–16%PVDF was 1.600 V. Therefore, the generators can be used as sensors in medical applications and other fields.
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H Ifijen, Ikhazuagbe, Nyaknno U Udokpoh, Gregory E Onaiwu, Eribe M Jonathan i Esther U Ikhuoria. "Coating Properties of Alkyd Resin, Epoxy Resins and Polyurethane Based Nanocomposites: A Review". Momona Ethiopian Journal of Science 14, nr 1 (22.10.2022): 1–31. http://dx.doi.org/10.4314/mejs.v14i1.1.
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The uniqueness of alkyd resin, epoxy resin, and polyurethane nanocomposites has brought prominent recognition to the field of heavy-duty coating materials. This is expected due to the collaborative features of nano-sized materials such as the high surface area to volume ratio, great functionality per-unit space, extremely small sizes with high density, and that of alkyd resin, epoxy resin, and polyurethane (biodegradability, great gloss retention, adaptability, flexibility, durability, good drying properties, and weathering resistance). The objective of this review was to analyze the extent and currency of research and the development of alkyd, epoxy, and polyurethane nanocomposites in coating applications. Some of the several types of modifications discussed in this review are the incorporation of varying types of nanoclay and metal nanoparticles materials into alkyd resins, the incorporation of carbon nanotubes, MGel-graphene oxide (GO)/gelatin (MGel), Ni (II) Complex-Zeolite and starch-modified nano-ZnO into epoxy resin and the incorporation of (Rb2Co(H2P2O7)2.2H2O), modified nanoparticles of ZnO, diminished graphene oxide (dGO) into polyurethane and their effects on coating applications. The various studied modifications resulted in nanocomposite end-products with much improved properties. However, there are several challenges to the development of nanocomposites that need urgent attention. Some of the challenges discussed are the difficulty involved in transforming fabricated nanocomposites from laboratory to commercialized scale, the capital-intensive nature of synthesizing large nanopowder, etc.
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Mahesh, Dabbugalla, i Swapan K. Mandal. "Multiferroicity in ZnO nanodumbbell/BiFeO3 nanoparticle heterostructures". International Journal of Modern Physics B 30, nr 12 (6.05.2016): 1650074. http://dx.doi.org/10.1142/s0217979216500740.
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We report here on the multiferroic properties of ZnO–BiFeO3 (BiFeO3 referred hereinafter as BFO) nanocomposite structures obtained by using a facile solution-based synthesis route. ZnO is found to grow in the form of well-crystallized and self-assembled dumbbell-like structures. BFO nanoparticles (NPs) are deposited onto ZnO nanodumbbells (NDs) to obtain ZnO–BFO heterostructures. The nanocomposites show prominent ferroelectric polarization hysteresis loop along with enhanced magnetization in comparison to pure BFO NPs. The ordered alignment of spins along with the suppression of Fe–O–Fe antiferromagnetic super-exchange interactions at the ZnO/BFO interface plausibly gives rise to observed multiferroic properties.
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Jha, Pankaj Kumar, Chamorn Chawengkijwanich, Chonlada Pokum, Pichai Soisan i Kuaanan Techato. "Antibacterial Activities of Biosynthesized Zinc Oxide Nanoparticles and Silver-Zinc Oxide Nanocomposites using Camellia Sinensis Leaf Extract". Trends in Sciences 20, nr 3 (15.01.2023): 5649. http://dx.doi.org/10.48048/tis.2023.5649.
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Green route of nanomaterials synthesis is increasing in demand due to ecofriendly to the environment. In this research, objective is to biosynthesize and evaluate the antibacterial performance of pure ZnO and Ag/ZnO nanocomposites using Camellia sinensis leaf extracts. Pure ZnO nanoparticles and Ag/ZnO nanocomposites were synthesized using Camellia sinensis leaf extract. The antibacterial effectiveness against gram-positive (Staphylococcus aureus) and gram-negative (Escherichia coli) bacteria were examined and compared with 1 % Chlorox as a commercial disinfectant by well diffusion method based on the zone of inhibition. Pure ZnO nanoparticles and Ag/ZnO nanocomposites had hexagonal shape ZnO nanoparticles and rectangular shape Ag nanoparticles in Ag/ZnO nanocomposites with a particle crystal size between 20 - 30 nm with carboxylic and phenolic functional group attached on it. Ag/ZnO nanocomposites exhibited antibacterial effectiveness against both gram-positive and gram-negative bacteria, while pure ZnO nanoparticles exhibited antibacterial effectiveness against only gram-positive bacteria. Conversely, 1 % Chlorox and 1 % DMSO showed no significant antibacterial activity against gram-positive and gram-negative bacteria. Camellia sinensis mediated ZnO and Ag/ZnO nanoparticles showed antibacterial potential against S. aureus and E. coli suggesting that green route to synthesis of antibacterial nanoparticles can be an excellent strategy to develop eco-friendly disinfectant products HIGHLIGHTS Zinc oxide nanocomposites biosynthesis by Camellia sinensis at low pH, Antibacterial properties of ZnO nanoparticles and Ag/ZnO nanocomposites on Escherichia coli ATCC 8739 and Staphylococcus aureus ATCC 6538P strains, Disinfection application. GRAPHICAL ABSTRACT
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Geetha, P., E. Sai Ram, N. Anasuya i P. Sarita. "Facile Synthesis of Graphene Based ZnO Nanocomposite". Volume 4,Issue 5,2018 4, nr 5 (28.10.2018): 508–10. http://dx.doi.org/10.30799/jnst.158.18040512.
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Graphene is one of the best conductive materials for developing nanocomposites due to its outstanding electronic properties. Graphene is developed by modified Hummers’ method. Zinc oxide (ZnO) based composites were developed by using different weight percentages (0.1%, 0.5% and 1%) as reinforcement. To enhance the dispersion of graphene in ZnO matrix the synthesis was processed by ultrasonication process. The obtained graphene oxide, ZnO and composites were characterized by X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FESEM) techniques for structural information, band analysis and surface morphology respectively. The proposed nanocomposites were developed by varying loading percentages 0.1%, 0.5% and 1% weight of graphene. These materials are used in various applications like varistors, energy storage, sensors, super capacitors and so on.
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Dinç Zor, Şule, i Hüsnü Cankurtaran. "Impedimetric Humidity Sensor Based on Nanohybrid Composite of Conducting Poly(diphenylamine sulfonic acid)". Journal of Sensors 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/5479092.
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Interdigitated thin film humidity sensors have been prepared using organic/inorganic nanocomposites of poly(diphenylamine sulfonic acid) (PSDA), 3-mercaptopropyltrimethoxysilane (MPTMS), and nano-ZnO. Humidity sensing properties of the sensors, regarding the effect of nano-ZnO addition and the applied alternating current frequency, were studied by impedance measurements in the frequency range of 100 Hz–1 kHz. It was found that the sensing properties of the ZnO based nanocomposite sensors had better properties than those of the PSDA-MPTMS based composite due to contribution of the nanomaterial. Good sensitivity (about three orders’ magnitude change in impedance), linear response, rapid response (90 s) and recovery (60 s), and low hysteresis within 4% as well as good repeatability and stability in the range from 12% to 95% RH were obtained.
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Kumar, Santosh, Fei Ye, Babak Mazinani, Sergey Dobretsov i Joydeep Dutta. "Chitosan Nanocomposite Coatings Containing Chemically Resistant ZnO–SnOx Core–shell Nanoparticles for Photocatalytic Antifouling". International Journal of Molecular Sciences 22, nr 9 (26.04.2021): 4513. http://dx.doi.org/10.3390/ijms22094513.
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Functional nanocomposites with biopolymers and zinc oxide (ZnO) nanoparticles is an emerging application of photocatalysis in antifouling coatings. The reduced chemical stability of ZnO in the acidic media in which chitosan is soluble affects the performance of chitosan nanocomposites in antifouling applications. In this study, a thin shell of amorphous tin dioxide (SnOx) was grown on the surface of ZnO to form ZnO–SnOx core–shell nanoparticles that improved the chemical stability of the photocatalyst nanoparticles, as examined at pH 3 and 6. The photocatalytic activity of ZnO–SnOx in the degradation of methylene blue (MB) dye under visible light showed a higher efficiency than that of ZnO nanoparticles due to the passivation of electronic defects. Chitosan-based antifouling coatings with varying percentages of ZnO or ZnO–SnOx nanoparticles, with or without the glutaraldehyde (GA) crosslinking of chitosan, were developed and studied. The incorporation of photocatalysts into the chitosan matrix enhanced the thermal stability of the coatings. Through a mesocosm study using running natural seawater, it was found that chitosan/ZnO–SnOx/GA coatings enabled better inhibition of bacterial growth compared to chitosan coatings alone. This study demonstrates the antifouling potential of chitosan nanocomposite coatings containing core–shell nanoparticles as an effective solution for the prevention of biofouling.
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Rahman, Mohammed M., Hadi M. Marwani, Faisal K. Algethami i Abdullah M. Asiri. "Xanthine sensor development based on ZnO–CNT, ZnO–CB, ZnO–GO and ZnO nanoparticles: an electrochemical approach". New Journal of Chemistry 41, nr 14 (2017): 6262–71. http://dx.doi.org/10.1039/c7nj00278e.
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The wet-chemical method was used to prepare the various ZnO–CNT, ZnO–CB, ZnO–GO nanocomposites, and ZnO nanoparticles in higher pH medium, which were finally utilized with 5% nafion to produce a thin film of NCs/Nafion/GCE sensor that has a faster response towards selected xanthine with higher sensitivity, lower detection limit, and large linear dynamic range by electrochemical approach.
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Wang, Weiwei, Dongyue Wang, Xixi Zhang, Chunqing Yang i Dongzhi Zhang. "Self-Powered Nitrogen Dioxide Sensor Based on Pd-Decorated ZnO/MoSe2 Nanocomposite Driven by Triboelectric Nanogenerator". Nanomaterials 12, nr 23 (1.12.2022): 4274. http://dx.doi.org/10.3390/nano12234274.
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This paper introduces a high-performance self-powered nitrogen dioxide gas sensor based on Pd-modified ZnO/MoSe2 nanocomposites. Poly(vinyl alcohol) (PVA) nanofibers were prepared by high-voltage electrospinning and tribological nanogenerators (TENGs) were designed. The output voltage of TENG and the performance of the generator at different frequencies were measured. The absolute value of the maximum positive and negative voltage exceeds 200 V. Then, the output voltage of a single ZnO thin-film sensor, Pd@ZnO thin-film sensor and Pd@ZnO/MoSe2 thin-film sensor was tested by using the energy generated by TENG at 5 Hz, when the thin-film sensor was exposed to 1–50 ppm NO2 gas. The experimental results showed that the sensing response of the Pd@ZnO/MoSe2 thin-film sensor was higher than that of the single ZnO film sensor and Pd@ZnO thin-film sensor. The TENG-driven response rate of the Pd@ZnO/MoSe2 sensor on exposure to 50 ppm NO2 gas was 13.8. At the same time, the sensor had good repeatability and selectivity. The synthetic Pd@ZnO/MoSe2 ternary nanocomposite was an ideal material for the NO2 sensor, with excellent structure and performance.
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Khan, Mujeeb, Syed Adil, Mohamed Assal, Abdulrahman Alharthi, Mohammed Shaik, Mufsir Kuniyil, Abdulrahman Al-Warthan i in. "Solventless Mechanochemical Fabrication of ZnO–MnCO3/N-Doped Graphene Nanocomposite: Efficacious and Recoverable Catalyst for Selective Aerobic Dehydrogenation of Alcohols under Alkali-Free Conditions". Catalysts 11, nr 7 (23.06.2021): 760. http://dx.doi.org/10.3390/catal11070760.
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Catalytic efficacy of metal-based catalysts can be significantly enhanced by doping graphene or its derivatives in the catalytic protocol. In continuation of previous work regarding the catalytic properties of highly-reduced graphene oxide (HRG), graphene-oxide (GO) doped mixed metal oxide-based nanocomposites, herein we report a simple, straightforward and solventless mechanochemical preparation of N-doped graphene (NDG)/mixed metal oxide-based nanocomposites of ZnO–MnCO3 (i.e., ZnO–MnCO3/(X%-NDG)), wherein N-doped graphene (NDG) is employed as a dopant. The nanocomposites were prepared by physical milling of separately fabricated NDG and ZnO–MnCO3 calcined at 300 °C through eco-friendly ball mill procedure. The as-obtained samples were characterized via X-ray diffraction (XRD), Thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FT-IR), Raman, Field emission scanning electron microscopy (FESEM), Energy-dispersive X-ray spectroscopy (EDX) and surface area analysis techniques. To explore the effectiveness of the obtained materials, liquid-phase dehydrogenation of benzyl alcohol (BOH) to benzaldehyde (BH) was chosen as a benchmark reaction using eco-friendly oxidant (O2) without adding any harmful surfactants or additives. During the systematic investigation of reaction, it was revealed that the ZnO–MnCO3/NDG catalyst exhibited very distinct specific-activity (80 mmol/h.g) with a 100% BOH conversion and <99% selectivity towards BH in a very short time. The mechanochemically synthesized NDG-based nanocomposite showed remarkable enhancement in the catalytic performance and increased surface area compared with the catalyst without graphene (i.e., ZnO–MnCO3). Under the optimum catalytic conditions, the catalyst successfully transformed various aromatic, heterocyclic, allylic, primary, secondary and aliphatic alcohols to their respective ketones and aldehydes with high selectively and convertibility without over-oxidation to acids. In addition, the ZnO–MnCO3/NDG was also recycled up to six times with no apparent loss in its efficacy.
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Sathiya, S. M., Gunadhor S. Okram, S. Maria Dhivya, Subramanian Mugesh, Maruthamuthu Murugan i M. A. Jothi Rajan. "Synergistic Bactericidal Effect of Chitosan/Zinc Oxide Based Nanocomposites Against Staphylococcus aureus". Advanced Science Letters 24, nr 8 (1.08.2018): 5537–42. http://dx.doi.org/10.1166/asl.2018.12144.
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The biocompatible Chitosan/Zinc oxide (CS/ZnO) nanocomposites (NCs) material was synthesized via a simple and versatile microwave assisted wet synthesis method. After the incorporation of CS in the ZnO nanoparticles (NPs), the crystalline structure of the modified NPs was retained in the NCs and it was clearly exposed in the X-ray diffraction (XRD) measurements. The Zeta potential measurement of CS/ZnO nanocomposites (NCs) shows more stability than ZnO NPs. The Field Emission Scanning Electron Microscopy (FE-SEM) measurements depict the formation of cauliflower like structure after the integration of CS in the ZnO NPs. The interaction between ZnO molecules in CS becomes more compact and is confirmed in the Fourier Transform Infrared Spectroscopy (FTIR) measurement. Bacterial activity was increased gradually with the CS/ZnO content and was analytically stronger against Gram-positive cells. This study has conclusively proved that reactive oxygen species (ROS) such as •OH, •O2− , and H2O2 were significantly produced from aqueous suspension of CS/ZnO and were primarily responsible for the bactericidal activity.
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Liao, Zhijia, Yao Yu, Zhenyu Yuan i Fanli Meng. "Ppb-Level Butanone Sensor Based on ZnO-TiO2-rGO Nanocomposites". Chemosensors 9, nr 10 (6.10.2021): 284. http://dx.doi.org/10.3390/chemosensors9100284.
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In this paper, ZnO-TiO2-rGO nanocomposites were successfully synthesized by the hydrothermal method. The morphology and structure of the synthesized nanomaterials were characterized by SEM, XRD, HRTEM, and XPS. Butanone is a typical ketone product. The vapors are extremely harmful once exposed, triggering skin irritation in mild cases and affecting our breathing in severe cases. In this paper, the gas-sensing properties of TiO2, ZnO, ZnO-TiO2, and ZnO-TiO2-rGO nanomaterials to butanone vapor were studied. The optimum operating temperature of the ZnO-TiO2-rGO sensor is 145 °C, which is substantially lower than the other three sensors. The selectivity for butanone vapor is greatly improved, and the response is 5.6 times higher than that of other organic gases. The lower detection limit to butanone can reach 63 ppb. Therefore, the ZnO-TiO2-rGO sensor demonstrates excellent gas-sensing performance to butanone. Meanwhile, the gas-sensing mechanism of the ZnO-TiO2-rGO sensor to butanone vapor was also analyzed.
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FANG, YONGLING, ZHONGYU LI, SONG XU, DANAN HAN i DAYONG LU. "FABRICATION OF SQUARAINE DYE SENSITIZED SPHERICAL ZINC OXIDE NANOCOMPOSITES AND THEIR VISIBLE-LIGHT INDUCED PHOTOCATALYTIC ACTIVITY". Nano 09, nr 03 (kwiecień 2014): 1450036. http://dx.doi.org/10.1142/s1793292014500362.
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A 1,3-bis[(3,3-dimethylindolin-2-ylidene)methyl]squaraine (ISQ) dye sensitized ZnO nanocomposites via two different preparation methods including hydrothermal and ultrasonic sensitization processes are discussed in this paper. The as-prepared composites were characterized by the X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), Raman spectroscopy, and transmission electron microscopy (TEM). Based on the XRD patterns and TEM images, the ISQ/ ZnO nanocomposites still kept the characteristic peaks and the basic morphology of ZnO and ISQ dye. The photocatalytic activity of ISQ/ ZnO nanocomposites was investigated by degrading methylene blue (MB) under visible-light illumination. Compared with the MB self-degradation rate, the photocatalytic activity of the ISQ/ ZnO composites was enhanced remarkably. The ISQ/ ZnO nanocomposites fabricated by ultrasonic sensitization method exhibited excellent photocatalytic degradation rate, approximately 20% higher than that of the hydrothermal sensitization one.
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Alahmadi, Nadiyah, i Mahmoud A. Hussein. "Impact of Ag/ZnO Reinforcements on the Anticancer and Biological Performances of CA@Ag/ZnO Nanocomposite Materials". Molecules 28, nr 3 (29.01.2023): 1290. http://dx.doi.org/10.3390/molecules28031290.
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In this study, an unpretentious, non-toxic, and cost-effective dissolution casting method was utilized to synthesize a group of anticancer and biologically active hybrid nanocomposite materials containing biopolymer cellulose acetate. Pristine ZnO and Ag(0.01, 0.05, 0.1)/ZnO hybrid nanofillers based on variable Ag NP loadings were prepared via green procedures in the presence of gum arabic (GA). The chemical structures and the morphological features of the designed nanocomposite materials were investigated by PXRD, TEM, SEM, FTIR, TGA, and XPS characterization techniques. The characterization techniques confirmed the formation of CA@Ag(0.01, 0.05, 0.1)/ZnO hybrid nanocomposite materials with an average crystallite size of 15 nm. All investigated materials showed two degradation steps. The thermal stability of the fabricated samples was ranked in the following order: CA/ZnO < CA@Ag(0.01)/ZnO < CA@Ag(0.05)/ZnO = CA@Ag(0.1)/ZnO. Hence, the higher Ag doping level slightly enhanced the thermal stability. The developed nanocomposites were tested against six pathogens and were used as the target material to reduce the number of cancer cells. The presence of Ag NPs had a positive impact on the biological and the anticancer activities of the CA-reinforced Ag/ZnO composite materials. The CA@Ag(0.1)/ZnO hybrid nanocomposite membrane had the highest antimicrobial activity in comparison to the other fabricated materials. Furthermore, the developed CA@Ag(0.1)/ZnO hybrid nanocomposite material effectively induced cell death in breast cancer.
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Su, Guofeng, Ximing Zhong, Songfa Qiu, Jiajin Fan, Hongjun Zhou i Xinhua Zhou. "Preparation of mesoporous silica-based nanocomposites with synergistically antibacterial performance from nano-metal (oxide) and polydopamine". Nanotechnology 33, nr 15 (18.01.2022): 155702. http://dx.doi.org/10.1088/1361-6528/ac467a.
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Abstract In this work, a novel antibacterial nanocomposite system was developed using mesoporous silica (MSN) as an effective nanocarrier, and the resultant nanocomposites demonstrated remarkable antibacterial performance due to the synergistic effect among nano zinc oxides, silver nanoparticles, and polydopamine (PDA). The successful synthesis of MSN/ZnO@PDA/Ag nanocomposites was confirmed. The physicochemical properties and the morphologies of these nanocomposites were investigated. It was found that the particle size increased along with the evolution of these nanocomposites. Besides, nano zinc oxides were formed in the nanochannels of mesoporous silica with a particle size about 2 nm, and that of silver nanoparticle was less than 50 nm. In addition, the results revealed that the presence of mesoporous silica could effectively prevent the formation of large-size silver nanoparticles and facilitate their well dispersion. Due to the synergistic effect among nano zinc oxides, silver nanoparticles, and polydopamine, these nanocomposites exhibited remarkable antibacterial performance even at a low concentration of 313 ppm, and the antibacterial mechanism was also elucidated. Therefore, this work provides a facile and controllable approach to preparing synergistically antibacterial nanocomposites, and the remarkable antibacterial performance make them suitable for practical applications.
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Harun, Nor Hazliana, Rabiatul Basria S. M. N. Mydin, Srimala Sreekantan, Khairul Arifah Saharuddin i Azman Seeni. "LLDPE/TiO<sub>2</sub>-ZnO Nanocomposite Films induces Transitory Oxidative Stress Response on Human Fibroblast and Blood Cell Lines Models". Journal of Biomimetics, Biomaterials and Biomedical Engineering 61 (31.07.2023): 77–91. http://dx.doi.org/10.4028/p-2aa27k.
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Healthcare-associated infections (HAIs) are a major safety concern globally that contribute to mortality rates amongst patients especially associated with indwelling or implanted medical devices. The advanced metal-oxide nanocomposites (MNPs) embedded in polymer matrix present an outstanding antibacterial profile, especially for MDR strains owing to reactive oxygen species (ROS) and free radicals’ mode of action. To date, there is still a lack of knowledge on the implication of external reactive species from MNPs-based polymers to humans. This study investigates the bio-interaction of TiO2-ZnO nanocomposite films embedded in linear low-density polyethylene (LLDPE/ TiO2-ZnO) on human fibroblast and blood cell lines model at molecular genes and protein level. The initial analysis of the in vitro bio-interaction responses on fibroblast and blood cell line models showed signs of cell membrane integrity disturbance, which might be due to free radicals’ activities, such as the release of intracellular ROS and Zn ions (Zn2+) during the initial cellular adaptation process on the TiO2–ZnO polymer nanocomposite film. Further findings found that cell–polymer nanocomposite film interaction could possibly trigger transitory oxidative stress response and cellular redox regulation via NF-kβ interactions. However, further comprehensive studies are needed to support this study, especially involving animal models.
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Wu, Di, i Ali Akhtar. "Ppb-Level Hydrogen Sulfide Gas Sensor Based on the Nanocomposite of MoS2 Octahedron/ZnO-Zn2SnO4 Nanoparticles". Molecules 28, nr 7 (4.04.2023): 3230. http://dx.doi.org/10.3390/molecules28073230.
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Hydrogen sulfide (H2S) detection is extremely necessary due to its hazardous nature. Thus, the design of novel sensors to detect H2S gas at low temperatures is highly desirable. In this study, a series of nanocomposites based on MoS2 octahedrons and ZnO-Zn2SnO4 nanoparticles were synthesized through the hydrothermal method. Various characterizations such as X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectrum (XPS) have been used to verify the crystal phase, morphology and composition of synthesized nanocomposites. Three gas sensors based on the nanocomposites of pure ZnO-Zn2SnO4 (MS-ZNO-0), 5 wt% MoS2-ZnO-Zn2SnO4 (MS-ZNO-5) and 10 wt% MoS2-ZnO-Zn2SnO4 (MS-ZNO-10) were fabricated to check the gas sensing properties of various volatile organic compounds (VOCs). It showed that the gas sensor of (MS-ZNO-5) displayed the highest response of 4 to 2 ppm H2S and fewer responses to all other tested gases at 30 °C. The sensor of MS-ZNO-5 also displayed humble selectivity (1.6), good stability (35 days), promising reproducibility (5 cycles), rapid response/recovery times (10 s/6 s), a limit of detection (LOD) of 0.05 ppm H2S (Ra/Rg = 1.8) and an almost linear relationship between H2S concentration and response. Several elements such as the structure of MoS2, higher BET-specific surface area, n-n junction and improvement in oxygen species corresponded to improving response.