Artículos de revistas: "Films nanocomposite"

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Wang, Wei, Zhen Li y Li Li. "Preparation and Characterization of Fe₃O₄/Poly (2-Hydroxyethyl Methacrylate) Magnetic Nanocomposite Films". Key Engineering Materials 396-398 (octubre de 2008): 465–68. http://dx.doi.org/10.4028/www.scientific.net/kem.396-398.465.

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Magnetic nanocomposite films of the Fe3O4/pHEMA were prepared by dispersing the Fe3O4 nanoparticles into the HEMA monomer before they were polymerized. The resultant nanocomposite films were characterized by Fourier transform infrared (FT-IR) and the vibrating sample magnetometer (VSM). The swelling behavies and the hemolytic ratios of the filmes were also investigated in this work.The equilibrium swelling ratio decreased with the increase of the amount of nanoparticles. The nanocomposite films had a clear superparamagnetic behavior because of the addition of nanoparticles. The hemolytic ratios were all lower than 5%, which indicated that the nanocomposites films had the good blood compatibility and can be used in the biomedical field

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Kumari, Sangeeta, Raj Pal Singh, Nayaku N. Chavan, Shivendra V. Sahi y Nilesh Sharma. "Characterization of a Novel Nanocomposite Film Based on Functionalized Chitosan–Pt–Fe3O4 Hybrid Nanoparticles". Nanomaterials 11, n.º 5 (13 de mayo de 2021): 1275. http://dx.doi.org/10.3390/nano11051275.

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The development of organic—inorganic hybrids or nanocomposite films is increasingly becoming attractive in light of their emerging applications. This research focuses on the formation of a unique nanocomposite film with enhanced elasticity suitable for many biomedical applications. The physical property measurement system and transmission electron microscopy were used to analyze Pt–Fe3O4 hybrid nanoparticles. These nanohybrids exhibited magnetic effects. They were further exploited to prepare the nanocomposite films in conjunction with a chitosan-g–glycolic acid organic fraction. The nanocomposite films were then examined using standard techniques: thermogravimetric analysis, X-ray diffraction, Fourier transform infrared spectroscopy, and atomic force microscopy. Tensile strength testing demonstrated a significantly greater elastic strength of these nanocomposite films than pure chitosan films. The water absorption behavior of the nanocomposites was evaluated by measuring swelling degree. These nanocomposites were observed to have substantially improved physical properties. Such novel nanocomposites can be extended to various biomedical applications, which include drug delivery and tissue engineering.

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Alakrach, Abdulkader M., Awad A. Al-Rashdi, Mohamed Khalid Al-Omar, Taha M. Jassam, Sam Sung Ting, Omar S. Dahham y Nik Noriman Zulkepli. "Physical and Barrier Properties of Polylactic Acid/Halloysite Nanotubes-Titanium Dioxide Nanocomposites". Materials Science Forum 1021 (febrero de 2021): 280–89. http://dx.doi.org/10.4028/www.scientific.net/msf.1021.280.

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In this study, PLA/TiO2 and PLA/HNTs-TiO2 nanocomposites films were fabricated via solution casting method. By testing the film density, solubility, water contact angle and water vapor permeability, the PLA nanocomposite films, the comprehensive performances of the nanocomposites were analysed. The outcomes demonstrated that maximum film density of PLA/TiO2 and PLA/HNTs-TiO2 nanocomposites films increased gradually with the increasing of nanofiller loadings. Moreover, the incorporation of TiO2 and HNTs-TiO2 significantly decreased the water vapor transmittance rate of the nanocomposite films with a slight priority to the addition of HNTs-TiO2, the water solubility was significantly improved with the addition of both nanofillers. Furthermore, the barrier properties were developed with the addition of both TiO2 and HNTs-TiO2 especially after the addition of low nanofiller loadings. Overall, the performance of the PLA/HNTs-TiO2 nanocomposite films was better than that PLA/TiO2 film. Nevertheless, both of the PLA nanocomposite samples achieved the requests of food packaging applications.

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Al-Asbahi, Bandar Ali, Mohammad Hafizuddin Haji Jumali y Rashad Al-Gaashani. "Efficient Charge Transfer Mechanism in Polyfluorene/ZnO Nanocomposite Thin Films". Journal of Nanomaterials 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/608572.

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The optical properties and charge transfer mechanism of poly (9,9′-di-n-octylfluorenyl-2.7-diyl) (PFO)/ZnO thin films have been investigated. The ZnO nanorods (NRs) were prepared via a microwave technique. The solution blending method was used to prepare the PFO/ZnO nanocomposites. X-ray diffraction (XRD) and field emission scanning electron microscope (FE-SEM) were used to determine the structural properties, while UV-Vis and photoluminescence (PL) were employed to investigate the optical properties of the films. XRD patterns confirmed that there was no variation in the structure of both PFO and ZnO NRs due to the blending process. FE-SEM micrographs displayed that ZnO NRs were well coated by PFO in all nanocomposite films. The absorption spectra of the nanocomposite thin films exhibited a red-shift indicating the increment in conjugation length of the PFO/ZnO nanocomposite. Significant quenching in the emission intensity of PFO was observed in fluorescence spectra of the nanocomposite films. This quenching was attributed to efficient charge transfer in the PFO/ZnO nanocomposites, which was further supported by the shorter PL lifetime of PFO/ZnO than that of the PFO thin film. The continuous decline in PL intensity of these nanocomposites is attributed to homogenous dynamic quenching between PFO and ZnO NRs.

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Suppiah, K., Teh Pei Leng, S. Husseinsyah, R. Rahman y Yeoh Chow Keat. "The Mechanical Properties of Carboxymethyl Cellulose (CMC) Filled Halloysite Nanotube (HNT) Bio-Nanocomposite Films: Effect of Sodium Dodecyl Sulfate (SDS)". Solid State Phenomena 280 (agosto de 2018): 335–39. http://dx.doi.org/10.4028/www.scientific.net/ssp.280.335.

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In this study, carboxymethyl cellulose (CMC) used as matrix, while halloysite nanotube (HNT) used as nanofiller to produce bio-nanocomposite films via solvent casting method. The effect of sodium dodecyl sulfate (SDS) on tensile properties and morphology study of CMC/HNT bio-nanocomposite films have been investigated. The results showed that the mechanical properties of treated CMC/HNT bio-nanocomposite films using SDS enhanced the tensile strength, elongation at break and modulus of elasticity compared to untreated CMC/HNT bio-nanocomposites. Besides, the tensile fracture surface of treated bio-nanocomposites demonstrated by field emission scanning electron micrograph (FESEM) indicates that the presence of SDS improved the interfacial interaction between CMC matrix and treated HNT nanofiller.

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Sapkota, Bedanga, Md Tanvir Hasan, Alix Martin, Rifat Mahbub, Jeffrey E. Shield y Vijaya Rangari. "Fabrication and magnetoelectric investigation of flexible PVDF-TrFE/cobalt ferrite nanocomposite films". Materials Research Express 9, n.º 4 (1 de abril de 2022): 046302. http://dx.doi.org/10.1088/2053-1591/ac6151.

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Abstract Flexible nanocomposite films, with cobalt ferrite nanoparticles (CFN) as the ferromagnetic component and polyvinylidene fluoride–trifluoroethylene (PVDF-TrFE) copolymer as the ferroelectric matrix, were fabricated using a blade coating technique. Nanocomposite films were prepared using a two-step process; the first process involves the synthesis of cobalt ferrite (CoFe2O4) nanoparticles using a sonochemical method, and then incorporation of various weight percentages (0, 2.5, 5, and 10%) of cobalt ferrite nanoparticles into the PVDF-TrFE to form nanocomposites. The ferroelectric polar β phase of PVDF-TrFE was confirmed by x-ray diffraction (XRD). Thermal studies of films showed notable improvement in the thermal properties of the nanocomposite films with the incorporation of nanoparticles. The ferroelectric properties of the pure polymer/composite films were studied, showing a significant improvement of maximum polarization upon 5wt% CFN loading in PVDF-TrFE composite films compared to the PVDF-TrFE film. The magnetic properties of as-synthesized CFN and the polymer nanocomposites were studied, showing a magnetic saturation of 53.7 emu g−1 at room temperature, while 10% cobalt ferrite-(PVDF-TrFE) nanocomposite shows 27.6 emu/g. We also describe a process for fabricating high optical quality pure PVDF-TrFE and pinhole-free nanocomposite films. Finally, the mechanical studies revealed that the mechanical strength of the films increases up to 5 wt% loading of the nanoparticles in the copolymer matrix and then decreases. This signifies that the obtained films could be suited for flexible electronics.

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7

Lin, Bao Ping, Hong Jian Liu, Yue Ming Sun y Chun Wei Yuan. "Preparation and Characterization of Polyimide/BaTiO₃ Nanocomposite Films with Lower Infrared Emissivity". Key Engineering Materials 326-328 (diciembre de 2006): 1749–52. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.1749.

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The silicon-containing polyimide/BaTiO3 nanocomposite films were prepared by mixing the silicon-containing poly(amic acid) based on bis(3,4-dicarboxyphenyl)dimethylsilane dianhydride and 4,4'-Oxydianiline with BaTiO3 nanoparticles, followed by thermal imidization. Structure and properties of the nanocomposite films were measured with FTIR, SEM, XPS and DMTA. The results indicated that the interfacial interaction between BaTiO3 nanoparticles and the silicon-containing polyimide was conspicuous, and that BaTiO3 nanoparticles appeared to be better dispersed in the polyimide matrix at a higher BaTiO3 concentration than at a lower one. The siliconcontaining polyimide/BaTiO3 nanocomposite films exhibited higher storage modulus and glass transition temperature than the original polyimide. It was also found that the infrared emissivity of the nanocomposite films varied with the content of BaTiO3 in the nanocomposites, and the nanocomposite films exhibited lower infrared emissivity value than the corresponding polyimide by measure of infrared emissivity.

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8

Jokar, Maryam, Russly Abdul Rahman y Luqman Chuah Abdullah. "Physical and Antimicrobial Characterization of Self Assembled Silver Nanoparticle/Chitosan onto Low Density Polyethylene Film as Active Packaging Polymer". Journal of Nano Research 27 (marzo de 2014): 53–64. http://dx.doi.org/10.4028/www.scientific.net/jnanor.27.53.

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Colloidal Silver nanoparticles with a size of 5 nm produced by chemical reduction using poly ethylene glycol (PEG 200). Layers of silver nanoparticles and chitosan were deposited onto low density polyethylene (LDPE) substrate by layer by layer (LBL) self-assembly technique. Silver nanocomposite films were built by sequential dipping of LDPE film in either anionic silver nanoparticles or cationic chitosan. Silver nanoparticles and chitosan led to the formation of nanocomposite films possessing antimicrobial properties with the thickness of 2, 4, 8, 12 and 20 layers. Silver nanocomposite films were characterized by atomic force microscopy (AFM). Thermal, mechanical and barrier properties of LBL deposited nanocomposite films were investigated. Results showed that the LBL deposition of silver nanoparticles and chitosan increased the crystallinity of the composites and also improved mechanical and barrier properties of LDPE film significantly (p<0.05). Antimicrobial activity of silver nanocomposites againstEscherichia coliandStaphylococcus aureuswas evaluated. Growth kinetic parameters ofE.coliandS.aureusaffected by silver nanocomposites were calculated by modeling of absorbance data according to Gomperz equation. LDPE-silver nanocomposite affected bacterial growth parameters significantly (p<0.05). The specific growth rate reduced from 0.30 to 0.11 h-1forE. coliand decreased 0.27 to 0.06 h-1forS. aureus.

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9

Arshad, Adillah Nurashikin, Rozana Mohd Dahan, Mohamad Hafiz Mohd Wahid, Zulkefle Habibah, Nyl Ismail Lyly, Muhamad Naiman Sarip y Rusop Mahmood Mohamad. "The Study of the Surface Morphology of PVDF/MgO Nanocomposites Thin Films". Advanced Materials Research 626 (diciembre de 2012): 311–16. http://dx.doi.org/10.4028/www.scientific.net/amr.626.311.

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This study investigates the effect of varying loading percentages of MgO on the topography and morphology of Poly (vinylideneflouride)/Magnesium Oxide (PVDF/MgO) nanocomposites thin films. PVDF/MgO nanocomposites spin coated thin films with thicknesses ranging from 200nm to 456nm were successfully characterized. The nanocomposite solutions were spin coated on Al-glass substrates at 1500rpm. The topography and surface roughness of PVDF/MgO nanocomposites were characterized by using AFM. FE-SEM was used to investigate the surface morphology of the nanocomposites thin films and ATR-FTIR was used to determine the chemical bonding of PVDF/MgO nanocomposites. MgO (7%) was found to be the optimum loading percentage for PVDF/MgO nanocomposite film with favorable distribution of MgO particles, minimum defects and high content of β-phase as evident by FESEM and FTIR.

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10

Abdul Ghani, Siti Waqina, Aznizam Abu Bakar y Sani Amril Samsudin. "Mechanical Properties of Chitosan Modified Montmorillonite Filled Tapioca Starch Nanocomposite Films". Advanced Materials Research 686 (abril de 2013): 145–54. http://dx.doi.org/10.4028/www.scientific.net/amr.686.145.

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This study was carried out to develop renewable and degradable plastics film with good mechanical properties. The mechanical properties between compatibilized montmorillonite (MMT)/chitosan filled tapioca starch (TPS), uncompatibilized MMT/TPS, and chitosan/TPS nanocomposite films were investigated. Experimental works were started with the extraction of local chitosan from chitin derived from prawn shells which involving deprotenization, demineralization and deacetylation treatments. Degree of deacetylation of chitosan was determined using infrared spectroscopy method. Chitosan was acted as compatibilizer between MMT and starch in order to improve the dispersion of MMT in nanocomposite systems. Nanocomposite films were prepared using a solution casting method with addition of glycerol as the plasticizer. The starch solution was cast onto PTFE mold with cavity thickness of 0.5mm. Characterizations of the nanocomposite films were done using Fourier Transform Infrared Analysis (FTIR). Tensile properties of nanocomposites were investigated. The compatibilized nanocomposite films, chitosan/MMT/TPS give significant effects to tensile properties. Chitosan has played its role as the compatibilizer and also as flexibility improvers to nanocomposite films because elongation at break improved after addition of chitosan.

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11

Wang, Adele Qi y Teresa Diane Golden. "Electrochemical Formation of Cerium Oxide/Layered Silicate Nanocomposite Films". Journal of Nanotechnology 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/8459374.

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Cerium oxide/montmorillonite nanocomposite films were synthesized electrochemically from solutions containing 0.5 to 50% Na-montmorillonite. The nanocomposites were characterized by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and Raman spectroscopy. Nanocomposite films synthesized from montmorillonite concentrations lower than 10% were continuous, uniform, and dense. X-ray diffraction confirmed that the nanocomposite films retain the face-centered cubic structure of cerium oxide while incorporating exfoliated platelets of the montmorillonite into the matrix. In addition, calculations from XRD data showed particle sizes ranging from 4.50 to 6.50 nm for the nanocomposite coatings. Raman and FTIR spectroscopy had peaks present for cerium oxide and the layered silicates in the coatings. Cross-sectional scanning electron microscopy and energy-dispersive X-ray spectroscopy confirmed the presence of montmorillonite throughout the cerium oxide matrix.

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12

Zhang, Yin-Ping, Xin Wang, Yi Shen, Kiran Thakur, Jian-Guo Zhang, Fei Hu y Zhao-Jun Wei. "Preparation and Characterization of Bio-Nanocomposites Film of Chitosan and Montmorillonite Incorporated with Ginger Essential Oil and Its Application in Chilled Beef Preservation". Antibiotics 10, n.º 7 (30 de junio de 2021): 796. http://dx.doi.org/10.3390/antibiotics10070796.

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In this study, bio-nanocomposite films containing different proportions of ginger essential oil (GEO), chitosan (Ch), and montmorillonite (MMT) were prepared and characterized, and the antibacterial effect of bio-nanocomposite films on chilled beef was evaluated. Fourier transform infrared analysis showed a series of intense interactions among the components of the bio-nanocomposite films. The infiltration of GEO increased the thickness of the film, reduced the tensile strength of the film, and increased the percentage of breaking elongation and the water vapor permeability. The migration of phenols in the films began to increase exponentially and reached equilibrium at about 48 h. The bio-nanocomposite films (Ch +0.5% GEO group, and Ch + MMT + 0.5% GEO group) effectively delayed the rise of pH, hue angle, and moisture values of chilled beef with time and slowed down the lipid oxidation and the growth of surface microorganisms on chilled beef. Altogether, the prepared biological nanocomposites can be used as promising materials to replace commercial and non-degradable plastic films.

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13

Park, Jin-Ho, Jin-Hoe Kim, Jin-Woo Park, Jin-Hae Chang y Chang-Sik Ha. "Preparation and Properties of Fluorine-Containing Colorless Polyimide Nanocomposite Films with Organo-Modified Montmorillonites for Potential Flexible Substrate". Journal of Nanoscience and Nanotechnology 8, n.º 4 (1 de abril de 2008): 1700–1706. http://dx.doi.org/10.1166/jnn.2008.18233.

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We prepared transparent polyimide (PI) and organo-modified montmorillonite (OMMT) nanocomposite films from the solution of poly(amic acid) and various amounts (0.5–2 wt%) of OMMT in N,N-dimethylacetamide (DMAc). The Poly(amic acid) was prepared from the reaction of 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and 2,2′-bis (trifluoromethyl)-4,4′-diamino phenyl (TFDB). Dodecylamine (C12-) and dodecyltriphenylphosphonium chloride (C12PPh-Cl–) were used as organic modifiers in OMMT. The PI/OMMT nanocomposite films were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), transmission electron microscope (TEM), UV-Vis transmission spectra, thermomechanical analysis (TMA), and rheometric dynamic analysis (RDA). As the OMMT contents is increased, PI/OMMT nanocomposites generally show better properties compared to pristine PI films, although the transparency of the PI/OMMT nanocomposite films is sacrificed slightly. However, it is concluded that these nanocomposite films are good candidates for potential flexible substrates.

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Abou El Fadl, Faten Ismail, Maysa A. Mohamed, Magida Mamdouh Mahmoud y Sayeda M. Ibrahim. "Studying the electrical conductivity and mechanical properties of irradiated natural rubber latex/magnetite nanocomposite". Radiochimica Acta 110, n.º 2 (22 de noviembre de 2021): 133–44. http://dx.doi.org/10.1515/ract-2021-1080.

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Abstract Nanocomposites have received voluminous interest due to the combination of unique properties of organic and inorganic component in one material. In this class, magnetic polymer nanocomposites are of particular interest because of the combination of excellent magnetic properties, stability, and good biocompatibility. This paper reports the preparation and characterization of nanocomposites films based on natural rubber in latex state (NRL) loaded with different concentrations of semiconducting magnetite nanoparticles (Fe3O4) (MNPs) (5, 10, 15, 20, and 30%). NRL (100%) and NRL/Fe3O4 nanocomposites were prepared by solution casting technique then, exposed to various irradiation doses (50, 70, 100 kGy).The nanocomposite’s morphological, and physical properties were investigated through various spectroscopic techniques such as Fourier-transformed infrared, X-ray diffraction, scanning electron, and transmission electron microscopies. The mechanical properties, including the tensile strength and elongation at break percentage (E b %) of the nanocomposites were also studied and compared with the 100% NRL films. Based on the results obtained from the mechanical study, it is found that the NRL/20% Fe3O4 nanocomposite film exhibited the highest tensile strength at 100 kGy. On the other hand, based on the conductivity study, it is found that, NRL/Fe3O4 nanocomposite with 10% magnetite exhibit the highest conductivity as the content of magnetite plays an important and effective role based on the high and homogeneous dispersity.

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15

Saha, Dipti, Mithun Kumar Majumdar, Ajoy Kumar Das, A. M. Sarwaruddin Chowdhury y Md Ashaduzzaman. "Structural Nanocomposite Fabrication from Self-Assembled Choline Chloride Modified Kaolinite into Poly(Methylmethacrylate)". Journal of Composites Science 3, n.º 3 (13 de agosto de 2019): 83. http://dx.doi.org/10.3390/jcs3030083.

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Composite materials produced from indigenous nanoscale particles and synthetic polymers have created demand in the field of nanoscience and technology. Layered silicates are potential candidates for reinforcing the properties of composites. Here, we report the fabrication of nanocomposites using poly(methylmethacrylate) (PMMA) as the matrix and the Bijoypur clay of Bangladesh known as kaolinite (200–250 nm) as the filler via solution casting. Kaolinite was first modified using choline chloride to prepare core-shell particles through a precipitation technique and was used for self-assembled nanocomposite films preparation. A series of nanocomposites films using 0, 1, 3, 5 and 10% (w/w) modified kaolinite was prepared. The neat PMMA and nanocomposite films were characterized by attenuated total reflection infra-red (ATR-IR) spectroscopy and X-ray diffraction (XRD) techniques. The mechanical properties, thermal stability, and morphology of the films were investigated using a universal testing machine (UTM), a thermal gravimetric analyzer (TGA), and a scanning electron microscope (SEM). The nanocomposite films exhibited better mechanical properties and thermal stability than neat PMMA film. Development of such structural nanocomposite materials using naturally occurring nanoscale particles would play a crucial role in the field of materials science for packaging applications and separation technology.

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Zhang, Shanju, Uwe H. F. Bunz y David G. Bucknall. "Chromatic Conductive Polymer Nanocomposites of Poly (p-Phenylene Ethynylene)s and Single-Walled Carbon Nanotubes". Journal of Composites Science 5, n.º 6 (14 de junio de 2021): 158. http://dx.doi.org/10.3390/jcs5060158.

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We report on dispersions and thin films of chromatic conductive nanocomposites of poly(p-phenylene ethynylene)s (PPEs) and single-walled carbon nanotubes (SWNTs) generated via solution mixing. The linear, conjugated PPEs with dialkyl- and dialkyloxy-side chain groups are shown to debundle and disperse high concentration (up to 2.5 mg/mL) SWNTs in various organic solvents. The solubilization of SWNTs and PPE wrapping is accompanied with the change in the solution color. Ultraviolet visible absorption spectra of nanocomposite solutions demonstrate a new absorption peak at a higher wavelength, supporting the observed chromatism. Fluorescence spectra of nanocomposite solutions display significant quenching of the fluorescence intensity and the Stern–Volmer model is used to analyze fluorescence quenching. Electron microscopy of the chromatic solid films of high mass fraction PPE/SWNT nanocomposites obtained by vacuum filtration reveals the debundled SWNTs in the PPE matrix. The tensile strength and Young’s modulus of these PPE/SWNT nanocomposite films are as high as 150 MPa and 15 GPa, respectively. The composite films exhibit remarkably high conductivities, ranging from ~1000 S/m to ~10,000 S/m for 10 wt% and 60 wt% SWNT nanocomposites, respectively.

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Chakravadhanula, Venkata Sai Kiran, Yogendra Kumar Mishra, Venkata Girish Kotnur, Devesh Kumar Avasthi, Thomas Strunskus, Vladimir Zaporotchenko, Dietmar Fink, Lorenz Kienle y Franz Faupel. "Microstructural and plasmonic modifications in Ag–TiO2 and Au–TiO2 nanocomposites through ion beam irradiation". Beilstein Journal of Nanotechnology 5 (1 de septiembre de 2014): 1419–31. http://dx.doi.org/10.3762/bjnano.5.154.

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The development of new fabrication techniques of plasmonic nanocomposites with specific properties is an ongoing issue in the plasmonic and nanophotonics community. In this paper we report detailed investigations on the modifications of the microstructural and plasmonic properties of metal–titania nanocomposite films induced by swift heavy ions. Au–TiO2 and Ag–TiO2 nanocomposite thin films with varying metal volume fractions were deposited by co-sputtering and were subsequently irradiated by 100 MeV Ag8+ ions at various ion fluences. The morphology of these nanocomposite thin films before and after ion beam irradiation has been investigated in detail by transmission electron microscopy studies, which showed interesting changes in the titania matrix. Additionally, interesting modifications in the plasmonic absorption behavior for both Au–TiO2 and Ag–TiO2 nanocomposites were observed, which have been discussed in terms of ion beam induced growth of nanoparticles and structural modifications in the titania matrix.

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Tamborra, M., M. Striccoli, M. L. Curri y A. Agostiano. "Hybrid Nanocomposites Based on Luminescent Colloidal Nanocrystals in Poly(methyl methacrylate): Spectroscopical and Morphological Studies". Journal of Nanoscience and Nanotechnology 8, n.º 2 (1 de febrero de 2008): 628–34. http://dx.doi.org/10.1166/jnn.2008.a088.

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We report on preparation process and optical characterization of a nanocomposite material obtained dispersing colloidal semiconductor nanocrystals (NCs), namely CdS and CdSe@ZnS core–shell system in poly(methyl methacrylate) (PMMA). Such method allows a large flexibility on nanocrystal materials and on the choice of the polymer characteristics. Nanocomposite thin films were extensively investigated by means optical and morphological techniques. The effects on NC composition, concentration, size, and surface chemistry on the spectroscopical and structural behaviour of the nanocomposite properties were studied. The NC size dependent optical properties of the nanocomposites are mainly accounted by the NC composition and size, while the morphology of the films is explained on the base of the NC surface characteristics and their concentration in the nanocomposites.

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Sahoo, Rajesh Kumar. "Preparation of Polypropylene/Silver Nanoparticles Nanocomposite Film and Evaluation of its Mechanical and Antimicrobial Properties w.r.t it’s Use in Packaging Applications". International Journal for Research in Applied Science and Engineering Technology 9, n.º VII (31 de julio de 2021): 3830–38. http://dx.doi.org/10.22214/ijraset.2021.37207.

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Polypropylene/silver nanoparticles nanocomposite films were prepared by melt compounding method by using polypropylene pallets and silver nanoparticles powder. The physical properties of the virgin polypropylene film and nanocomposite films were evaluated by mechanical testing. The effect of various silver nanoparticles content in the polymer nanocomposites with respect to its antimicrobial efficacy against the Gram positive bacteria Escherichia coli and Gram positive bacteria Staphylococcus aureus were studied. Nanocomposite film containing higher percentage of silver nanoparticles loading showed 99.9 % efficacy against the bacteria as compared to virgin polypropylene film.

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Szymczyk, Anna, Sandra Paszkiewicz, Iwona Pawelec, Sławomir Lisiecki, Marek Jotko, Zdenko Špitalský, Jaroslav Mosnáček y Zbigniew Rosłaniec. "Oxygen Barrier Properties and Melt Crystallization Behavior of Poly(ethylene terephthalate)/Graphene Oxide Nanocomposites". Journal of Nanomaterials 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/382610.

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Poly(ethylene terephthalate) nanocomposites with low loading (0.1–0.5 wt%) of graphene oxide (GO) have been prepared by usingin situpolymerization method. TEM study of nanocomposites morphology has shown uniform distribution of highly exfoliated graphene oxide nanoplatelets in PET matrix. Investigations of oxygen permeability of amorphous films of nanocomposites showed that the nanocomposites had better oxygen barrier properties than the neat PET. The improvement of oxygen permeability for PET nanocomposite films over the neat PET is approximately factors of 2–3.3. DSC study on the nonisothermal crystallization behaviors proves that GO acts as a nucleating agent to accelerate the crystallization of PET matrix. The evolution of the lamellar nanostructure of nanocomposite and neat PET was monitored by SAXS during nonisothermal crystallization from the melt. It was found that unfilled PET and nanocomposite with the highest concentration of GO (0.5 wt%) showed almost similar values of the long period (L=11.4 nm for neat PET andL=11.5 nm for PET/0.5GO).

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Nasar, Gulfam, Hazrat Amin, Fawad Ahmad y Shahbaz Nazir. "Structural and Thermal Behavior Evaluation of Ag-PVA Nanocomposites Synthesized via Chemical Reduction Technique". Journal of Materials and Physical Sciences 1, n.º 1 (30 de junio de 2020): 19–25. http://dx.doi.org/10.52131/jmps.2020.0101.0003.

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Silver nanoparticles were prepared via process of chemical reduction using sodium borohydride as reductant. The prepared nanoparticles were then utilized for synthesizing various compositions of nanocomposites with polymeric matrix of poly (vinyl alcohol). For doing so, the nanoparticles were dispersed in the polymer solution by vigorous stirring. The solutions of the nanocomposites were cast in films. The nanocomposite films were used for various characterization techniques; out of which three are being reported in this communication; XRD, TGA/DTA and SEM. The upshot of XRD proposes a semi-crystalline nature of synthesized nanocomposite. The crystalline character of the nanocomposite enhances with an increasing doping concentration of the prepared nanoparticles. Thermal analysis suggests the degradation pattern of the polymer nanocomposite material and represents that thermal stability improves as the silver nanoparticles are added. The SEM micrograph reveals a uniform surface with a well dispersed nanoparticle in the polymer matrix.

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Grozdanov, Anita, Ana Tomova, Perica Paunović y T. Aleksandar Dimitrov. "Polymer Nanocomposite Films with Functionalized MWCNTs". Applied Mechanics and Materials 328 (junio de 2013): 778–83. http://dx.doi.org/10.4028/www.scientific.net/amm.328.778.

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Polymer nanocomposites with carbon nanotubes (CNTs) have become very attractive class of materials for numerous engineering applications since carbon nanotubes exhibit a high aspect ration, unique electrical, mechanical and structural properties. Functionalization of CNTs offer new potentials for other technical challenges of the polymer based nanocomposites associated with their specific interactions. A biocompatible polymer matrices PMMA and PCL were used to provide good interfacial bonding between carbon nanotubes. MWCNT (d=30-50 nm, purity>95%) were used for preparation of polymer based nanocomposites with 0.2, 0.5 and 1.0 % w/w MWCNTs content. PMMA-based nanocomposites were prepared via the mixing of the MWCNT and polymer in a dichloromethane solution for 24 h, while for the PCL-based nanocomposites as a solvent tetrahyrofurane was used. Functionalization of the CNTs was performed in acid (HNO3) and alkali (NH4OH+H2O2) medium as well as by additional thermal oxidation at 490°C. Characterization of the nanocomposite films was performed by DSC, TGA, WAX, FTIR and SEM. The obtained results have shown that introducing MWCNT into polymer matrix significantly changes have been found in the properties of the obtained nanocomposites.

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Yilmaz Dogan, Hazal, Yasin Altin y Ayşe Çelik Bedeloğlu. "Fabrication and properties of graphene oxide and reduced graphene oxide reinforced Poly(Vinyl alcohol) nanocomposite films for packaging applications". Polymers and Polymer Composites 30 (enero de 2022): 096739112211133. http://dx.doi.org/10.1177/09673911221113328.

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Petroleum-based polymers have a wide range of uses in the packaging industry, including films, food packaging, rigid containers, foamed containers, medical products, etc. This study focuses on improving the properties of polyvinyl alcohol (PVA) based material systems, one of the most popular water-soluble biopolymers, to reduce the waste of petroleum-based plastics, which are widely used. Polyvinyl alcohol (PVA) nanocomposite films containing low concentrations (0.05–1%) of graphene oxide (GO) and reduced graphene oxide (rGO) were produced via the solution casting method. When electrical properties of nanocomposite films were evaluated, the addition of 1 wt% GO and rGO resulted in a 36% and 45% decrease in the volumetric resistance of the films as well as a decrease in surface resistance of 24.5% and 34.9%, respectively. The maximum tensile strength of 1% GO and rGO-reinforced PVA nanocomposites was found to be ∼59 MPa and ∼68 MPa with an increase of 20% and 38% compared to neat PVA films, respectively. The average Young’s modulus of 1% GO and rGO-reinforced PVA nanocomposites also increased from 2561 MPa to 3515 MPa and 4219 MPa with an increase of 37% and 65%, respectively. As a result, the electrical conductivity, Young’s modulus, maximum tensile strength, thermal properties, and optical absorption of nanocomposite films increased by adding GO and rGO to PVA. The results show that the produced nanocomposite film may be a promising material for packaging applications.

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24

Humud, Hammad R. "Structure and optical properties of PANI/MWCNTs nanocomposites thin films prepared by plasma jet polymerization". Iraqi Journal of Physics (IJP) 15, n.º 34 (8 de enero de 2019): 55–64. http://dx.doi.org/10.30723/ijp.v15i34.120.

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Polyaniline Multi walled Carbon nanotubes (PANI/MWCNTs) nanocomposite thin films have been prepared by non-equilibrium atmospheric pressure plasma jet on glass substrate with different weight percentage of MWCNTs 1, 2, 3, 4%. The diameter of the MWCNTs was in the range of 8-55 nm and length - - 55 55 μm. the nanocomposite thin films were characterized by UV-VIS, XRD, FTIR, and SEM. The optical studies show that the energy band gap of PANI/MWCNTs nanocomposites thin films will be different according to the MWCNTs polyaniline concentration. The XRD pattern indicates that the synthesized PANI/MWCNTs nanocomposite is amorphous. FTIR reveals the presence of MWCNTs nanoparticle embedded into polyaniline. SEM surface images show that the MWCNTs homogenously inside the polyaniline house. It can be concluded that the nanocomposite can be prepared PANI/MWCNTs thin films by plasma jet polymerization and control the optical energy band gap irregulars by controlling the MWCNTs weight concentration.

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25

Chen, Yingxia, Shuya Fan, Xibin Yi, Bing Li, Shiwei Chen, Shuyu Liu, Tao Hu y Si Chen. "Preparation and Property of Bio-Polyimide/Halloysite Nanocomposite Based on 2,5-Furandicarboxylic Acid". Polymers 13, n.º 23 (23 de noviembre de 2021): 4057. http://dx.doi.org/10.3390/polym13234057.

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Bio-based polyimide (PI)/halloysite nanotube (HNT) nanocomposites based on 2,5-furandicarboxylic acid were prepared by in situ polymerization. The pristine HNTs were modified by tetraethoxysilane (TEOS) and 4,4′-oxybisbenzenamine (ODA). The bio-based PI/HNT nanocomposite film exhibited lower moisture absorption than pure bio-based polyimide, showing that the water resistance of the bio-based polyimide film was improved. The thermal stability and glass transition temperature (Tg) of PI/HNTs nanocomposites were improved with the addition of modified HNTs. Both the tensile strength and Young’s modulus of bio-based PI/HNTs nanocomposite films were enhanced. A 37.7% increase in tensile strength and a 75.1% increase in Young’s modulus of bio-based PI/HNTs nanocomposite films, with 1 wt% of the modified HNTs, were achieved. The result confirmed that 2,5-furandicarboxylic acid could replace the oil-based material effectively, thus reducing pollution and protecting the environment. Finally, a preparation mechanism to prepare bio-based PI/HNTs nanocomposite is proposed.

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26

Gopal, N., A. Saxena, B. Kumar y R. Sahney. "Carbon Nanotube and Ethylene-Vinyl Acetate Based Soft Nanocomposite Film: Preparation and Characterization". Asian Journal of Chemistry 33, n.º 7 (2021): 1656–62. http://dx.doi.org/10.14233/ajchem.2021.23319.

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Soft and conductive interfaces are valuable in wearable electronics as they are capable for integration of diverse classes of electronic and sensor technologies directly with living body which can be used as health monitoring systems. In present work, we explore the development of multi-walled carbon nanotube-ethylene vinyl acetate nanocomposite (MWCNT-EVA) film and their properties. Oxidation of MWCNT is known to improve their dispersion properties and increase the electrical conductivity of MWCNT-polymer nanocomposites. Thus, pristine MWCNTs (p-MWCNTs) and functionalized MWCNTs (f-MWCNTs) were further used as conductive filler to construct p-MWCNT-EVA and f-MWCNT-EVA nanocomposite films. The films were characterized by Fourier-transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray analysis and electrochemical technique. The results indicated that the chemical oxidation of p-MWCNT generates carboxylic function at the p-MWCNT surface important for sensor fabrication. The concentration of carboxylic functional group in f-MWCNT higher than in nanocomposites. The f-MWCNT-EVA nanocomposite film electrode surface show much higher conductivitythan p-MWCNT-EVAnanocomposite film. Thus, the soft and flexible f-MWCNT-EVA nanocomposite films are effective for the development of electrochemical platform for biosensor fabrication in wearable applications.

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27

Purwandari, Vivi y Malemta Tarigan. "PREPARASI FILM NANOKOMPOSIT POLIVINIL ALKOHOL (PVA)/NANOKARBON DARI CANGKANG BUAH SAWIT (NCCS) DENGAN METODE PENCAMPURAN LARUTAN". JURNAL KIMIA SAINTEK DAN PENDIDIKAN 6, n.º 1 (24 de julio de 2022): 11–16. http://dx.doi.org/10.51544/kimia.v6i1.2977.

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Polyvinyl alcohol (PVA) has good compatibility when added as filler in the form of nanocarbon so that it can produce environmentally friendly nanocomposite products. Thus, the addition of nanocomposites to PVA-based films is expected to increase and improve the mechanical properties of the resulting PVA films. This study aims to utilize palm fruit shells as raw materials for nanocarbons and as fillers for nanocomposites, as well as to determine the mechanical properties and thermal strength of nanocarbon nanofibers in the PVA matrix. Composite films were made using the solution mixing method. The research was conducted by mixing PVA solution (3.5 g) with various concentrations of nanocarbon from palm fruit shells (NCCS) and 2 ml of glycerol and 1 g of PEG 400. Film characterization includes tensile test, scanning differential calorimetry (DSC), and conductivity test. Tensile test of PVA/NCCS nanocomposite resulted in tensile strength of 0.314 MPa and an elongation of 4.21925 %. The thermal test of PVA/NCCS nanocomposite with DSC yielded a melting point of around 146.06oC. Electrical conductivity of PVA/NCCS 107.1 (1.07 x 10-3) s/cm. PVA/NCCS nanocomposite based on conductivity scale including a semiconductor material.

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28

Sivagami, D. y B. Geetha Priyadarshini. "Role of carbon quantum dot for enhanced performance of photo-absorption in Cu₂CoSnS₄ superstrate solar cell device". Materials Advances 3, n.º 5 (2022): 2405–16. http://dx.doi.org/10.1039/d1ma01117k.

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1. CCTS and CCTS:CQD nanocomposites were successfully deposited. 2. Physical characteristics of synthesized CCTS and CCTS:CQD thin films were examined. 3. CCTS:CQD nanocomposite was used as a p-type layer in an inorganic thin-film solar cell. 4. The photoconversion efficiencies were obtained for CCTS and CCTS:CQD nanocomposite.

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Abdelfattah, E. M., H. Elzanaty, W. B. Elsharkawy, M. A. Azzam, Z. M. Elqahtani, S. Alotibi, M. Alyami y T. Fahmy. "Enhancement of the Structure, Thermal, Linear/Nonlinear Optical Properties, and Antibacterial Activity of Poly (vinyl alcohol)/Chitosan/ZnO Nanocomposites for Eco-Friendly Applications". Polymers 15, n.º 21 (31 de octubre de 2023): 4282. http://dx.doi.org/10.3390/polym15214282.

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The preparation of poly (vinyl alcohol)/chitosan/ZnO (PVA/Cs/ZnO) nanocomposite films as bioactive nanocomposites was implemented through an environmentally friendly approach that included mixing, solution pouring, and solvent evaporation. The nanocomposite films were characterized using various techniques such as X-ray diffraction (XRD), Fourier-transform infrared (FT-IR) spectroscopy, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and UV-Vis spectroscopy. The XRD study revealed the encapsulation of nanoparticles by the PVA/Cs blend matrix. The DSC results showed that the addition of ZnO NPs increased glass transition and melting temperature values of the PVA/Cs blend. ATR-FTIR spectra detected an irregular shift (either red or blue) in some of the characteristic bands of the PVA/Cs nanocomposite, indicating the existence of intra/intermolecular hydrogen bonding creating an interaction between the OH groups of PVA/Cs and ZnO nanoparticles. A thermogravimetric (TGA) analysis demonstrated that the nanocomposites achieved better thermal resistance than a pure PVA/Cs blend and its thermal stability was enhanced with increasing concentration of ZnO nanoparticles. UV analysis showed that with an increase in the content of ZnO NPs, the optical bandgap of PVA/Cs was decreased from 4.43 eV to 3.55 eV and linear and nonlinear parameters were enhanced. Our optical results suggest the use of PVA/Cs/ZnO nanocomposite films for various optoelectronics applications. PVA/Cs/ZnO nanocomposites exhibited significant antibacterial activity against Gram-positive and Gram-negative bacteria. It was found that nanocomposite samples were more effective against Gram-positive compared to Gram-negative bacteria.

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Wang, Ying, Shuai Zhang, Yanli Lin, Qianyi Wang, Ying Zhang, Changmei Sun y Rongjun Qu. "Preparation and Properties of UV-Curable Waterborne Polyurethane Acrylate/MXene Nanocomposite Films". Nanomaterials 13, n.º 23 (26 de noviembre de 2023): 3022. http://dx.doi.org/10.3390/nano13233022.

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In this study, waterborne polyurethane acrylate (WPUA)/MXene nanocomposite films with varying MXene loadings were fabricated using UV-curing technology, where MXene (Ti3C2Tx) was employed as a nanofiller. The microstructure and chemical structure of the WPUA/MXene nanocomposite films were examined by XRD and FTIR, respectively. The water contact angle testing demonstrated that the incorporation of MXene into the nanocomposite films led to an increase in their hydrophilic properties. The tensile strength, the elongation at break, and Young’s modulus of the WPUA/MXene nanocomposite coatings exhibited an initial increase followed by a decrease with increasing MXene loadings. Compared to the pure WPUA film, the tensile strength and elongation at break of nanocomposites with 0.077 wt% MXene loading reached their maximum values, which increased by 39.9% and 38.5%, respectively. Furthermore, the glass transition temperature and the thermal stability were both enhanced by MXene to some extent. This study introduces a novel method for utilizing MXene in UV-curable waterborne coatings.

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Yussuf, A. A., M. A. Al-Saleh y S. T. Al-Enezi. "Investigation of Thermal and Rheological Properties of Polypropylene and Montmorillonite (MMT) Nanocomposites". Advanced Materials Research 1105 (mayo de 2015): 3–6. http://dx.doi.org/10.4028/www.scientific.net/amr.1105.3.

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The performances of PP/MMT nanocomposite (70μm thick films), in terms of thermal and rheological properties were investigated. A twin-screw extruder was used to compound PP, MMT, compatibilizer, and extruded nanocomposite films were collected for test. All results were compared and the influence of MMT contents on the final properties were observed and reported. The thermal properties of PP had improved by increasing MMT content from 0-3 phr. However at 4 phr thermal stability of the nanocomposite had slightly dropped. In terms of rhelogical properties, the addition of MMT to the PP blend increased the complex viscosity of the nanocomposites, particularly at low frequency regions.

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32

VYAS, RISHI, SARLA SHARMA, PARUL GUPTA, K. SACHDEV y S. K. SHARMA. "SYNTHESIS AND HYDROGEN SENSING PROPERTIES OF CNT-ZnO NANOCOMPOSITE THIN FILMS". International Journal of Modern Physics: Conference Series 22 (enero de 2013): 478–82. http://dx.doi.org/10.1142/s2010194513010544.

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CNT-ZnO nanocomposite powders were synthesized by addition of carbon nanotubes (CNT) during the growth of ZnO nanoparticles using a wet-chemical method. These CNT-ZnO nanocomposites powder were then spin coated on corning glass substrates to obtain thin films which were characterized using X-ray diffraction, scanning electron microscopy and current voltage characteristics. Hydrogen sensing (50- 1000 ppm) carried out on pure and CNT-ZnO nanocomposites at operating temperature of 250 and 300°C in N2 atmosphere (0.4±0.03 mbar) revealed higher sensitivity in 2 wt.% CNT-ZnO nanocomposite thin film compared to the pure ZnO thin film.

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33

Zhang, Mi, Yu Gao, Yixing Zhan, Xiaoqing Ding, Ming Wang y Xinlong Wang. "Preparing the Degradable, Flame-Retardant and Low Dielectric Constant Nanocomposites for Flexible and Miniaturized Electronics with Poly(lactic acid), Nano ZIF-8@GO and Resorcinol Di(phenyl phosphate)". Materials 11, n.º 9 (18 de septiembre de 2018): 1756. http://dx.doi.org/10.3390/ma11091756.

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Degradable, flame retardant, and flexible nanocomposite films with low dielectric constant were prepared with poly (lactic acid) (PLA), nano ZIF-8@GO, and degradable flame-retardant resorcinol di(phenyl phosphate) (RDP). The SEM results of the fractured surfaces indicated that ZIF-8@GO and RDP were dispersed uniformly in the PLA matrix. The prepared films had good mechanical properties and the tensile strength of the film with 1.5 wt% of ZIF-8@GO was increased to 48.2 MPa, compared with 38.5 MPa of pure PLA. Meanwhile, the nanocomposite films were flexible due to the toughing effect of RDP. Moreover, above 27.0% of limited oxygen index (LOI) and a VTM-0 rating were achieved for the nanocomposite films. The effects of nano ZIF-8@GO hybrids and RDP on the dielectric properties were investigated, and the results showed that ZIF-8@GO and RDP were beneficial in reducing the dielectric constant and dielectric loss of the nanocomposites.

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Tang, Ben Zhong, Yanhou Geng, Qunhui Sun, Xi Xiang Zhang y Xiabin Jing. "Processible nanomaterials with high conductivity and magnetizability. Preparation and properties of maghemite/polyaniline nanocomposite films". Pure and Applied Chemistry 72, n.º 1-2 (1 de enero de 2000): 157–62. http://dx.doi.org/10.1351/pac200072010157.

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A versatile process employing anionic surfactants has been developed for the preparation of processible nanocomposite films with electrical conductivity and magnetic susceptibility. Maghemite (γFe2O3) nanoclusters (~10 nm in size) are coated with 4-dodecyl-benzenesulfonic acid, and polyaniline (PAn) chains are doped with 10-camphorsulfonic acid. The coated nanoclusters and doped polymers are soluble in common solvents, and casting the solutions readily gives free-standing nanocomposite films with nanocluster contents as high as ~50 wt %. The γFe2O3/PAn nanocomposites show high conductivity (82–237 S cm -1 ) and magnetizability (up to ~35 emu/g γFe2O3).

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35

Vertlib, Viatcheslav, Marianne Dietiker, Michael Plötze, Lee Yezek, Ralph Spolenak y Alexander M. Puzrin. "Fast assembly of bio-inspired nanocomposite films". Journal of Materials Research 23, n.º 4 (abril de 2008): 1026–35. http://dx.doi.org/10.1557/jmr.2008.0147.

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This paper presents a spin-coating layer-by-layer assembly process to prepare multilayered polyelectrolyte-clay nanocomposites. This method allows for the fast production of films with controlled layered structure. The preparation of a 100-bilayer film with a thickness of about 330 nm needs less than 1 h, which is 20 times faster than conventional dip-coating processes maintaining the same hardness and modulus values. For validation of this technique, nanocomposite films with thicknesses up to 0.5 μm have been created with the common dip self-assembly and with the spin coating layer-by-layer assembly technique from a poly(diallyldimethylammonium)chloride (PDDA) solution and a suspension of a smectite clay mineral (Laponite). Geometrical characteristics (thickness, roughness, and texture) as well as mechanical characteristics (hardness and modulus) of the clay-polyelectrolyte films have been studied. The spin-coated nanocomposite films exhibit clearly improved mechanical properties (hardness 0.4 GPa, elastic modulus 7 GPa) compared to the “pure” polymer film, namely a sixfold increase in hardness and a 17-fold increase in Young’s modulus.

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36

Kim, Sung, Mac Kim, Jae Park y Sang-Jin Lee. "Optical, Electrical, and Surface Properties of Cu/Plasma Polymer Fluorocarbon Nanocomposite Thin Film Fabricated Using Metal/Polymer Composite Target". Applied Sciences 9, n.º 7 (28 de marzo de 2019): 1296. http://dx.doi.org/10.3390/app9071296.

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We propose a new method of fabricating metal–polymer composite targets for sputtering, which makes it easier to control the composition and enables the homogeneous and reproducible fabrication of metal–polymer nanocomposites over large areas. Using Cu/polytetrafluoroethylene composite targets containing 20, 50, and 80 wt.% Cu, Cu/plasma polymer fluorocarbon (PPFC) nanocomposite thin films were prepared by radio-frequency (RF) sputtering. Targets with 80 wt.% Cu were conductive; moreover, sputtering was possible not only with RF but also with mid-range frequency (MF) and direct current (DC) power sources. The nanocomposite thin film deposited by MF and DC power using an 80 wt.% Cu target showed near-metallic characteristics, exhibited absorption peaks at 618 and 678 nm, and had a surface resistance of 2 × 104 and 34.55 Ω/sq, respectively. We also analyzed the structure and composition of the Cu/PPFC nanocomposite films by X-ray diffraction and X-ray photoelectron spectroscopy. The described metal–polymer targets can advance the applications and commercialization of nanocomposite thin films.

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Bhatt, Nirali A., Robynne L. Paldi, James P. Barnard, Juanjuan Lu, Zihao He, Bo Yang, Chao Shen et al. "ZnO-Au Hybrid Metamaterial Thin Films with Tunable Optical Properties". Crystals 14, n.º 1 (6 de enero de 2024): 65. http://dx.doi.org/10.3390/cryst14010065.

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ZnO-Au nanocomposite thin films have been previously reported as hybrid metamaterials with unique optical properties such as plasmonic resonance properties and hyperbolic behaviors. In this study, Au composition in the ZnO-Au nanocomposites has been effectively tuned by target composition variation and thus resulted in microstructure and optical property tuning. Specifically, all the ZnO-Au nanocomposite thin films grown through the pulsed laser deposition (PLD) method show obvious vertically aligned nanocomposite (VAN) structure with the Au nanopillars embedded in the ZnO matrix. Moreover, the average diameter of Au nanopillars increases as Au concentration increases, which also leads to the redshifts in the surface plasmon resonance (SPR) wavelength and changes in the hyperbolic behaviors of the films. As a whole, this work discusses how strain-driven tuning of optical properties and microstructure resulted through a novel Au concentration variation approach which has not been previously attempted in the ZnO-Au thin film system. These highly ordered films present great promise in the areas of sensing, waveguides, and nanophotonics to name a few.

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Huang, Jian-Lin, Derek G. Gray y Chao-Jun Li. "A3-Coupling catalyzed by robust Au nanoparticles covalently bonded to HS-functionalized cellulose nanocrystalline films". Beilstein Journal of Organic Chemistry 9 (10 de julio de 2013): 1388–96. http://dx.doi.org/10.3762/bjoc.9.155.

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We decorated HS-functionalized cellulose nanocrystallite (CNC) films with monodisperse Au nanoparticles (AuNPs) to form a novel nanocomposite catalyst AuNPs@HS-CNC. The uniform, fine AuNPs were made by the reduction of HAuCl4 solution with thiol (HS-) group-functionalized CNC films. The AuNPs@HS-CNC nanocomposites were examined by X-ray photoelectron spectroscopy (XPS), TEM, ATR-IR and solid-state NMR. Characterizations suggested that the size of the AuNPs was about 2–3 nm and they were evenly distributed onto the surface of CNC films. Furthermore, the unique nanocomposite Au@HS-CNC catalyst displayed high catalytic efficiency in promoting three-component coupling of an aldehyde, an alkyne, and an amine (A3-coupling) either in water or without solvent. Most importantly, the catalyst could be used repetitively more than 11 times without significant deactivation. Our strategy also promotes the use of naturally renewable cellulose to prepare reusable nanocomposite catalysts for organic synthesis.

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DURMAZ, EKREM y SAIM ATES. "EFFECT OF NANOCELLULOSE TYPE AND MATRIX MATERIAL ON PRODUCTION OF NANOCOMPOSITE FILMS". Cellulose Chemistry and Technology 57, n.º 5-6 (20 de julio de 2023): 625–35. http://dx.doi.org/10.35812/cellulosechemtechnol.2023.57.57.

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The objective of this study has been to investigate the chemical structure, thermal and mechanical properties of nanocomposite films, which were produced by combining cellulose nanofibrils (CNFs) and cellulose nanocrystals (CNCs) with different ratios of boric acid (BA) and polyvinyl alcohol (PVA) as a matrix. Nanocomposites reinforced with BA had B–O–B, and B–O–C ether bonds, while the addition of PVA did not influence the chemical bonds of the films. Furthermore, the addition of BA to CNF and CNC films enhanced the thermal resistance of the films at high temperatures, but the addition of PVA declined the thermal properties of these films. Considering the mechanical properties of nanocomposite films, it was determined that adding PVA to CNF and CNC films had a positive impact, unlike BA. Consequently, it was concluded that each BA and PVA have their advantages and can be preferred for specific industrial applications.

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Gudkov, Sergey V., Dmitriy E. Burmistrov, Vasily N. Lednev, Aleksander V. Simakin, Oleg V. Uvarov, Roman N. Kucherov, Petr I. Ivashkin, Alexey S. Dorokhov y Andrey Yu Izmailov. "Biosafety Construction Composite Based on Iron Oxide Nanoparticles and PLGA". Inventions 7, n.º 3 (20 de julio de 2022): 61. http://dx.doi.org/10.3390/inventions7030061.

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Nanocomposites based on polymers and nanoparticles are used in agriculture for photoconversion of solar radiation, as a basis for covering material, as a packaging material, and as functional films. At the same time, nanocomposites are almost never used in agriculture as biosafe structural materials. In this work, we have developed a technology for obtaining a nanocomposite based on PLGA and iron oxide nanoparticles. The nanocomposite has unique physical and chemical properties and also exhibits pronounced antibacterial properties at a concentration of iron oxide nanoparticles of more than 0.01%. At the same time, the nanocomposite does not affect the growth and development of pepper and is biocompatible with mammalian cells. Nanocomposites based on PLGA and iron oxide nanoparticles can be an attractive candidate for the manufacture of structural and packaging materials in agriculture.

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Kim, Wang Ryeol, Sungbo Heo, Hyundong Kim, Jun-Ho Kim, In-Wook Park y Wonsub Chung. "High Temperature Oxidation Behavior of Cr–Al–Si–N Nanocomposite Films Deposited by Filtered Arc Ion Plating Technique". Journal of Nanoscience and Nanotechnology 20, n.º 7 (1 de julio de 2020): 4394–97. http://dx.doi.org/10.1166/jnn.2020.17605.

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High temperature oxidation behavior of nanocomposite films is very important characteristics for application of machining and cutting tools. Quaternary Cr–Al–Si–N nanocomposite films with various compositions were deposited onto WC-Co and Si wafer substrates using a filtered arc ion plating technique. The composition of the films were controlled by different combinations of CrAl2 and Cr4Si composite target power in a reactive gas mixture of high purity Ar and N2 during depositions. The instrumental analyses revealed that the synthesized Cr–Al–Si–N films with Si content of 2.78 at.% were nanocomposites consisting of nano-sized crystallites (3–7 nm in dia.) and a thin layer of amorphous Si3N4 phases. The nanohardness of the Cr–Al–Si–N films exhibited the maximum values of ~42 GPa at a Si content of ~2.78 at.% due to the microstructural change to nanocomposite as well as solid-solution hardening. The Cr–Al–Si–N film shows superior result of oxidation resistance at 1050 °C for 30 min in air. Based on the XRD and GDOES analyses on the oxidized films, it could be revealed that the enrichment of Al (17.94 at.%) and Cr (26.24 at.%) elements in the film leads to form an Al2O3 and Cr2O3 layer on the Cr–Al–Si–N film surface. Therefore, in this study, the microstructural changes on the mechanical properties and oxidation behavior with various compositions in the Cr–Al–Si–N nanocomposite films were discussed and correlated with the deposition parameters.

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42

Julinawati, Julinawati, Rahmi Rahmi, Kartika MZ., Irfan Mustafa y Suryati Suryati. "The Effect of Antioxidants of α-Tocopherol on the Characteristic of Mechanical, Thermal, and Morphology Properties of Polypropylene-Montmorillonite (PP-MMT) Nanocomposites". Journal of Carbazon 1, n.º 1 (29 de junio de 2023): 28–34. http://dx.doi.org/10.24815/jokarbazon.v1i1.32812.

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The purpose of this study was to determine the effect of α-tocopherol on the mechanical, thermal, and morphological properties of polypropylene-montmorillonite (PP-MMT) nanocomposites. The preparation of polypropylene-montmorillonite (PP-MMT-AO) nanocomposites was carried out on PP compositions; PP-g-MA; MMT-octadecyl amine; AO is 80;10;10;5 and the PP-MMT nanocomposite composition is PP; PP-g-MA; MMT-Octadecyl amine: 80;10;10. The SEM results showed that polypropylene, MMT, and the antioxidant α-tocopherol could be exfoliated and intercalated to produce compatible nanocomposites. The mechanical and thermal test results showed that the PP-MMT-AO nanocomposite had higher mechanical properties and thermal stability than the PP-MMT nanocomposite. Based on the FTIR test and degradation test on PP-MMT and PP-MMT-AO films which were carried out for up to 15 days and 30 days showed that the PP-MMT-AO nanocomposite against UV light was given, this shows that α-Tocopherol can prevent oxidation reactions polypropylene.

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43

Krasinskyi, V. V., L. Dulebova, I. Gajdos y O. O. Ivanukh. "Research of nanocomposite based on polyvinyl alcohol by differential scanning calorimetry". Chemistry, Technology and Application of Substances 4, n.º 2 (1 de noviembre de 2021): 188–94. http://dx.doi.org/10.23939/ctas2021.02.188.

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The methods of obtaining structured and water-soluble nanocomposite films based on polyvinyl alcohol and intercalated montmorillonite are presented in the paper. The structure and thermophysical characteristics of the obtained films were investigated by differential scanning calorimetry. It was found that the modification of polyvinyl alcohol by intercalated montmorillonite reduces the degree of crystallinity of the obtained nanocomposites but significantly increases their heat resistance. Structured films based on polyvinyl alcohol have a homogeneous crosslinked structure.

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Jahantigh, Farhad y Mehdi Nazirzadeh. "Synthesis and Characterization of TiO2Nanoparticles with Polycarbonate and Investigation of its Mechanical Properties". International Journal of Nanoscience 16, n.º 05n06 (11 de agosto de 2017): 1750012. http://dx.doi.org/10.1142/s0219581x17500120.

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In this project, nanocomposite films were prepared with different Titanium dioxide (TiO2) percentages. Properties of polycarbonate (PC) and PC–TiO2nanocomposite films were studied by X-ray diffraction (XRD) analysis and Fourier transform infrared (FTIR) spectroscopy. The structure of samples was studied by XRD. The mechanical properties of PC–TiO2nanocomposite films were investigated by conducting tensile tests and hardness measurements. Thermal stability of the nanocomposites was studied by thermogravimetric analysis (TGA) method. The elastic modulus of the composite increased with increasing weight fraction of nanoparticles. The microhardness value increases with increasing TiO2nanoparticles. The results of tensile testing were in agreement with those of micro-hardness measurements. In addition, TGA curves showed that nanocomposite films have higher resistance to thermal degradation compared to polycarbonate. There are many reports related to the modification of polycarbonate films, but still a systematic study of them is required.

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Su, Li Fen, Lei Miao y Sakae Tanemura. "ZnO/SiO₂ Nanocomposite Cryogels Prepared by Vacuum Freeze Drying". Materials Science Forum 663-665 (noviembre de 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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Ni, Zhang Gen, Zhen Jun Dou, Tao Lin, Miao Cheng y Zong Yi Qin. "Polyurethane Nanocomposite Films by Using Cellulose Nanospheres as Green Nanofillers". Advanced Materials Research 1052 (octubre de 2014): 65–68. http://dx.doi.org/10.4028/www.scientific.net/amr.1052.65.

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To overcome poor mechanical properties of polyurethane, carboxylated cellulose nanospheres were incorporated into polyurethane in an organic polar solvent, dimethylformamide to prepare the nanocomposite films. Morphological, structural, mechanical and thermal characterization of the nanocomposites was done with scanning electron microscopy, Fourier transform infrared spectrometry, micro–control electronic universal testing machine and thermal gravimetric analysis. The critical challenge to achieve high macroscale properties of the bulk nanocomposites is the ability to obtain well–dispersed cellulose nanospheres in polymer matrices.

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Gitari, Baraka, Boon Peng Chang, Manjusri Misra, Alireza Navabi y Amar K. Mohanty. "A comparative study on the mechanical, thermal, and water barrier properties of PLA nanocomposite films prepared with bacterial nanocellulose and cellulose nanofibrils". BioResources 14, n.º 1 (18 de enero de 2019): 1867–89. http://dx.doi.org/10.15376/biores.14.1.1867-1889.

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Mechanical, thermal, and water barrier properties of poly(lactic acid) (PLA) film reinforced with cellulose nanofibrils (CNF) and bacterial nanocellulose (BNC) were studied and compared. The in-situ formation of sodium carbonate (Na2CO3) on the BNC surface may aid in reducing the interchain hydrogen bonding and agglomeration of BNC fibers. At optimum loading, both CNF/PLA and BNC/PLA nanocomposite films exhibited higher tensile strength and Young’s modulus than the neat PLA without sacrificing its toughness. The BNC/PLA nanocomposite films displayed lower water vapor transmission rate (WVTR) as compared to neat PLA and CNF/PLA films at 0.5 and 1.0 wt%. BNC was found to induce imperfect crystal structures and exhibited higher overall crystallinity than neat PLA and CNF/PLA composites at 0.5 wt%. The BNC/PLA showed higher mechanical properties than CNF/PLA nanocomposites. Nanocellulose derived from plants and bacteria could provide promising solutions to develop high performance biobased-nanocomposites film for packaging application.

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Rosddi, Najwa Norimanina Muhammad, Yap Wing Fen, Nur Ain Asyiqin Anas, Nur Alia Sheh Omar, Nur Syahira Md Ramdzan y Wan Mohd Ebtisyam Mustaqim Mohd Daniyal. "Cationically Modified Nanocrystalline Cellulose/Carboxyl-Functionalized Graphene Quantum Dots Nanocomposite Thin Film: Characterization and Potential Sensing Application". Crystals 10, n.º 10 (27 de septiembre de 2020): 875. http://dx.doi.org/10.3390/cryst10100875.

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In this study, highly functional cationically modified nanocrystalline cellulose (NCC)/carboxyl-functionalized graphene quantum dots (CGQD) has been described. The surface of NCC was first modified with hexadecyltrimethylammonium bromide (CTA) before combining with CGQD. The CGQD, CTA-NCC and CTA-NCC/CGQD nanocomposites thin films were prepared using spin coating technique. The obtained nanocomposite thin films were then characterized by using the Fourier transform infrared spectroscopy (FTIR) which confirmed the existence of hydroxyl groups, carboxyl groups and alkyl groups in CTA-NCC/CGQD. The optical properties of the thin films were characterized using UV–Vis spectroscopy. The absorption of CTA-NCC/CGQD was high with an optical band gap of 4.127 eV. On the other hand, the CTA-NCC/CGQD nanocomposite thin film showed positive responses towards glucose solution of different concentration using an optical method based on surface plasmon resonance phenomenon. This work suggests that the novel nanocomposite thin film has potential for a sensing application in glucose detection.

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Huang, Jijie, Weiwei Li, Hao Yang y Judith L. MacManus-Driscoll. "Tailoring physical functionalities of complex oxides by vertically aligned nanocomposite thin-film design". MRS Bulletin 46, n.º 2 (febrero de 2021): 159–67. http://dx.doi.org/10.1557/s43577-021-00028-0.

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AbstractSelf-assembled nanocomposite thin films couple two materials into a single film, typically, in the form of vertically aligned nanopillars embedded in a matrix film. High-density vertical heterointerfaces provide a great platform for engineering new physical properties and novel multifunctionalities, as well as for nanoscale device integration. Tremendous research efforts have been devoted to developing different nanocomposite systems. In this article, we summarize recent progress on vertically aligned nanocomposite thin films for enhanced functionalities such as ferroelectricity, tunable magnetoresistance, multiferroicity, dielectricity, magnetic anisotropy, perpendicular exchange bias, novel electrical/ionic properties, interfacial conduction, and resistive switching. Using specific examples, we discuss how and why the fundamental physical properties can be significantly tuned/improved in vertically aligned nanocomposites. Finally, we propose future research directions to achieve further enhanced performance as well as practical devices.

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Jamróz, Ewelina, Piotr Kulawik y Pavel Kopel. "The Effect of Nanofillers on the Functional Properties of Biopolymer-Based Films: A Review". Polymers 11, n.º 4 (12 de abril de 2019): 675. http://dx.doi.org/10.3390/polym11040675.

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Waste from non-degradable plastics is becoming an increasingly serious problem. Therefore, more and more research focuses on the development of materials with biodegradable properties. Bio-polymers are excellent raw materials for the production of such materials. Bio-based biopolymer films reinforced with nanostructures have become an interesting area of research. Nanocomposite films are a group of materials that mainly consist of bio-based natural (e.g., chitosan, starch) and synthetic (e.g., poly(lactic acid)) polymers and nanofillers (clay, organic, inorganic, or carbon nanostructures), with different properties. The interaction between environmentally friendly biopolymers and nanofillers leads to the improved functionality of nanocomposite materials. Depending on the properties of nanofillers, new or improved properties of nanocomposites can be obtained such as: barrier properties, improved mechanical strength, antimicrobial, and antioxidant properties or thermal stability. This review compiles information about biopolymers used as the matrix for the films with nanofillers as the active agents. Particular emphasis has been placed on the influence of nanofillers on functional properties of biopolymer films and their possible use within the food industry and food packaging systems. The possible applications of those nanocomposite films within other industries (medicine, drug and chemical industry, tissue engineering) is also briefly summarized.

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