Littérature scientifique sur le sujet « TiO2 nanocomposite »
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Articles de revues sur le sujet "TiO2 nanocomposite"
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Kustiningsih, Indar, Asep Ridwan, Devi Abriyani, Muhammad Syairazy, Teguh Kurniawan et Dhena Ria Barleany. « Development of Chitosan-TiO2 Nanocomposite for Packaging Film and its Ability to Inactive Staphylococcus Aureus ». Oriental Journal of Chemistry 35, no 3 (18 juin 2019) : 1132–37. http://dx.doi.org/10.13005/ojc/350329.
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The aim of present study is to synthesize chitosan-TiO2 nanocomposite for packaging and its ability to inactive Staphylococcus aureus. TiO2 Degussa P25 were dispersed in chitosan matrix in order to produce film-forming solution. The samples were characterized by SEM, FTIR, tensile strength, antibacterial and biodegradable test. The tensile strength test results showed that Cs-0.1Ti was the best nanocomposite compared to other variations of TiO2 addition. Whereas for the test of S. aureus bacteria showed that no more S. aureus bacteria were found in chitosan-TiO2 nanocomposite after incubation for 24 hours. It indicated more effective use of nanocomposites by adding TiO2 compared to without adding TiO2. For biodegradation analysis, the addition of TiO2 slows the nanocompostites degradation process, which is indicated by the less mass loss that occurs in Cs-0.5 Ti nanocomposite.
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Alakrach, Abdulkader M., Awad A. Al-Rashdi, Mohamed Khalid Al-Omar, Taha M. Jassam, Sam Sung Ting, Omar S. Dahham et Nik Noriman Zulkepli. « Physical and Barrier Properties of Polylactic Acid/Halloysite Nanotubes-Titanium Dioxide Nanocomposites ». Materials Science Forum 1021 (février 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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Mai Xuan, Truong, Cuong Tran Manh, Huong Hau Van et Nguyen Bui Duc. « Visible light photocatalytic activity of TiO2/MWCNTS nanocomposite prepared using hydrothermal method ». Vietnam Journal of Catalysis and Adsorption 10, no 1S (15 octobre 2021) : 334–38. http://dx.doi.org/10.51316/jca.2021.121.
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Titanium dioxide nanocomposites/multi-walled carbon nanotubes (TiO2/MWCNTs) were successfully synthesized by hydrothermal method. The synthesized TiO2/MWCNTs nanocomposites (10, 30 and 50% TiO2/MWCNTs) nanocomposites were characterized with powder X-ray diffraction (XRD), transmission electron microscope(TEM) and UV–visible diffuse reflection spectrum (DRS). The photocatalytic activity of TiO2/MWCNTs nanocomposite for the degradation of Rhodamin B (RhB) under visible light irradiation was studied. Compared with pure TiO2 nanoparticles, the TiO2/MWCNTs nanocomposite displayed higher photocatalytic activity for the degradation of RhB and the 30% TiO2/MWCNTs photocatalyst exhibited the highest photocatalytic activity.
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Fajriati, Imelda, Mudasir Mudasir et Endang Tri Wahyuni. « Photocatalytic Decolorization Study of Methyl Orange by TiO2–Chitosan Nanocomposites ». Indonesian Journal of Chemistry 14, no 3 (21 octobre 2014) : 209–18. http://dx.doi.org/10.22146/ijc.21230.
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The photocatalytic decolorization of methyl orange (MO) by TiO2-chitosan nanocomposite has been studied. This study was started by synthesizing TiO2-chitosan nanocomposites using sol-gel method with various concentrations of Titanium(IV) isopropoxide (TTIP) as the TiO2 precursor. The structure, surface morphology, thermal and optical property of TiO2-chitosan nanocomposite were characterized by X-ray diffraction (XRD), fourier transform infra red (FTIR) spectroscopy, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and diffuse reflectance ultra violet (DRUV) spectroscopy. The photocatalytic activity of TiO2-chitosan nanocomposite was evaluated by photocatalytic decolorization of methyl orange as a model pollutant. The results indicate that the particle size of TiO2 increases with increasing ofthe concentration of TTIP, in which TiO2 with smallest particle size exhibit the highest photocatalytic activity. The highest photocatalytic decolorization was obtained at 5 h of contact time, initial concentration of MO at 20 ppm and at solution pH of 4. Using these conditions, over 90% of MO was able to be decolorized using 0.02 g of TiO2-chitosan nanocomposite under UV light irradiation. The TiO2-chitosan nanocomposite could be reused, which meant that the TiO2-chitosan nanocomposites can be developed as an effective and economical photocatalyst to decolorize or treat dye in wastewater.
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Pon Maha Lakshmi, P., C. Vedhi et P. Rajakani. « Electrocatalytic Activity of PMMA–Anatase TiO2 Nanocomposites ». ECS Transactions 107, no 1 (24 avril 2022) : 3933–44. http://dx.doi.org/10.1149/10701.3933ecst.
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We characterized optically and electrochemically synthesised pure PMMA and PMMA–TiO2 nanocomposites developed through various proportions of anatase TiO2 (TiO2 (A)) added by chemical polymerization at room temperature. The characterization of the nanocomposite was carried out using FT-IR, UV-Vis, XRD, and FESEM. Cyclic voltammetric studies exhibit good adherent behaviour on the electrode surface at pH 7.0 for PMMA and pH 4.0 for PMMA–TiO2 nanocomposite. It has been observed that PMMA–TiO2 nanocomposite modified GCE has good oxygen reduction ability, and also enhances resistance behaviour.
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Fajriati, Imelda, Mudasir Mudasir et Endang Tri Wahyuni. « Adsorption and Photodegradation of Cationic and Anionic Dyes by TiO2-Chitosan Nanocomposite ». Indonesian Journal of Chemistry 19, no 2 (9 avril 2019) : 441. http://dx.doi.org/10.22146/ijc.38278.
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The adsorption and photodegradation of cationic and anionic dyes by TiO2-chitosan nanocomposites have been studied. This study investigated the specific surface area, pores volume, pores size of TiO2-Chitosan nanocomposite, and determination kinetics of the reaction on the adsorption and photodegradation process. The methods were carried out by mixing TiO2-nanocomposite into cationic and anionic dyes in various contact times and initial dye concentrations. The results showed that nanocomposite adsorption capacity increased with an increase in the amount of chitosan (TiO2/Chit 0.13) even though the specific surface area (SBET) was reduced. The results indicated that the adsorption on nanocomposite was influenced by the amount of -NH2 and -OH on the chitosan surface. The maximum adsorption capacity (qm) and the observed reaction constant (kObs) for MO were also known to be higher than MB, which means that the TiO2-chitosan nanocomposites could remove anionic dye more than cationic one.
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Oktarina, Kurniawati. « REMOVAL OF DYES IN SONGKET WASTE WATER BY USING PHOTOCATALYST Chitosan-TiO2 ». Jurnal Distilasi 4, no 1 (28 janvier 2020) : 1. http://dx.doi.org/10.32502/jd.v4i1.2153.
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Photocatalyst is one of the catalysts that works when given a certain light and generally is a semiconductor that has a full valence band and an empty conduction band, such as TiO2. Synthesis of chitosan-TiO2 nanocomposite research has been carried out, nanocomposites produced from squid cartilage as chitosan-?. Nanocomposites are synthesized by combining chitosan as a supporting material and TiO2 which has a function as a high photocatalytic. Characterization of chitosan-TiO2 nanocomposites by FTIR and SEM / EDX which shows the functional groups and surface morphology of the nanocomposite. FTIR analysis shows the absorption band of O-Ti-O in the region of 678.98 cm-1 and the typical absorption of chitosan at wave numbers –OH 3425.58 cm 1, 3834.49 cm-1, and 3873.06 cm-1. From SEM / EDX analysis it can be seen that TiO2 is evenly distributed on the surface of chitosan. Then nanocomposite was applied with wrna procion in Palembang songket liquid waste. Chitosan-TiO2 nanocomposites from squid cartilage were able to degrade procion dyes in water medium with the help of UV light at the optimum wavelength of 520 nm, where the percentage of photodegradation was 54.47%. Which nanocomposite is also able to reduce the concentration of procion dyes from 5 mg / L to 1.9 mg / L with an initial acidity (pH) of 10.34 to 7.13. Key words: Photocatalyst, nanocomposites, Procion Red
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ABBASI, AMIRALI, et JABER JAHANBIN SARDROODI. « ADSORPTION OF THIOPHENE ON N-DOPED TiO2/MoS2 NANOCOMPOSITES INVESTIGATED BY VAN DER WAALS CORRECTED DENSITY FUNCTIONAL THEORY ». Surface Review and Letters 25, no 01 (janvier 2018) : 1850038. http://dx.doi.org/10.1142/s0218625x18500385.
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Comparison of structural and electronic properties between pristine and N-doped titanium dioxide-(TiO2)/molybdenum disulfide (MoS2) nanocomposites and their effects on the adsorption of thiophene molecule were performed using density functional theory calculations. To correctly estimate the adsorption energies, the van der Waals interactions were taken into account in the calculations. On the TiO2/MoS2 nanocomposite, thiophene molecule tends to be strongly adsorbed by its sulfur atom. The five-fold coordinated titanium atom of TiO2 was found to be an active binding site for thiophene adsorption. The results suggest that the thiophene molecule has not any mutual interaction with MoS2 nanosheet. The electronic structures of the complex systems are discussed in terms of the density of states and molecular orbitals of the thiophene molecules adsorbed to the TiO2/MoS2 nanocomposites. It was also found that the doping of nitrogen atom is conductive to the interaction of thiophene with nanocomposite. Thus, it can be concluded that the interaction of thiophene with N-doped TiO2/MoS2 nanocomposite is more energetically favorable than the interaction with undoped nanocomposite. The sensing capability of TiO2/MoS2 toward thiophene detection was greatly increased upon nitrogen doping. These processes ultimately lead to the strong adsorption of thiophene on the N-doped TiO2/MoS2 nanocomposites, indicating potential applicability of these nanocomposites as novel gas sensors.
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Alakrach, Abdulkader M., Awad A. Al-Rashdi, Taha Alqadi, Mohammed Abdulhakim Al Saadi, Sam Sung Ting, Omar S. Dahham et Nik Noriman Zulkepli. « Polylactic Acid/Halloysite Nanotubes-Titanium Dioxide Nanocomposites : Antibacterial and Mechanical Properties ». Materials Science Forum 1021 (février 2021) : 270–79. http://dx.doi.org/10.4028/www.scientific.net/msf.1021.270.
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Polylactic acid (PLA) nanocomposite samples with different properties like mechanical, thermal, barrier and antibacterial properties are good candidates as packaging biomaterials. Unique PLA/TiO2 and PLA/HNTs-TiO2 nanocomposite samples were fabricated by solution casting method. The mechanical and antibacterial properties of PLA/TiO2 and PLA/HNTs-TiO2 samples were investigated with comparing to the pristine PLA film as a control sample. PLA nanocomposite samples with TiO2 nanofillers showed poorer mechanical properties while PLA films with PLA/HNTs-TiO2 showed unique developments, which tensile strength improved by 46% with the incorporation of 5 wt%. The PLA nanocomposites showed a high efficiency to both Gram positive and Gram negative bacteria, significant antibacterial effect being proved after first week elapsed time by comparing to the control sample (presenting no antibacterial effect). By considering the multifunctional characteristics of PLA/TiO2 and PLA/HNTs-TiO2 nanocomposites, the samples produced by solution casting can be considered a favourable alternative as environmental-friendly packaging materials.
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Buasri, Achanai, Pornpimon Loakhonka, Tanaporn Benjapolchai, Nitchanan Chusripet et Vorrada Loryuenyong. « Surface Modification and Characterization of Photodegradable Polystyrene-TiO2 Nanocomposites ». Applied Mechanics and Materials 372 (août 2013) : 128–31. http://dx.doi.org/10.4028/www.scientific.net/amm.372.128.
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In this study, polystyrene (PS) nanocomposites with TiO2 and surface-modified TiO2 nanoparticles were prepared by compression molding method. TiO2 nanoparticles were modified by 3-(methacryloxy) propyl trimethoxysilane (MPS). The resulting nanocomposite thick films were compared with pure polystyrene. It was found that MPS-modified TiO2 nanoparticles were better dispersed in PS matrix due to their hydrophobic characteristics. The addition of small amount of TiO2 nanoparticles could greatly decrease the optical bandgap of PS from 4.0 eV in pure PS to less than 3.0 eV in PS-TiO2 nanocomposite. The effects of surface modification and UVC irradiation on the physical properties and the degradation of nanocomposites were investigated.
Thèses sur le sujet "TiO2 nanocomposite"
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Fasahat, F., R. Dastjerdi et M. R. M. Mojtahedi. « Thermophysiological Comfort by PA6/TiO2 Nanocomposite Yarns ». Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35603.
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Thermophysiological comfort is one of the most important factors for people to choose desirable gar-ments, which can be evaluated via measuring permeability of body heat and sweat. In this paper the water vapor permeability of nanocomposite nylon 6 fabrics produced from melt spun nanocomposite yarns with different TiO2 nanoparticle concentrations have been investigated. Results from measuring water vapor permeability at different environment temperatures for 4 h. indicated that sample with 0.4 wt% of TiO2 nanoparticle can provide fabric with maximum comfort properties. At low temperature 27.5% decline of permeability as compared to pure fabric causes this sample to protect body from cool weather through pre-venting loss of body heat. By increasing temperature from 12 to 35 oC water vapor permeability enhance-ment of nanocomposite improved about 99% as compared to pure one. Consequently nanocomposite with suitable nanoparticle content can provide more comfortable fabrics in different temperatures and applica-tions.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35603
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Niparte, Baiba. « New insights in super-hydrophilicity of TiO2-SiO2 nanocomposite films ». Master's thesis, Universidade de Aveiro, 2012. http://hdl.handle.net/10773/9228.
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Mestrado em Ciência e Engenharia de MateriaisOs efeitos resultantes da hidrofilicidade de compósitos TiO2-SiO2 com diferente reatividade e composição química em processos sol-gel têm sido descritos na literatura. Esses resultados mostram que formulações sol-gel menos reativas originam super-hidrofilicidade, isto é, um ângulo de contacto inferior a 10° após envelhecimento superior a 8 semanas (envelhecimento em condições ambiente). Tendo em conta a morfologia de derivados de filmes compósitos e diferentes modelos termodinâmicos de superficie, sugere-se que um filme compósito com uma textura mais porosa poderá levar a um efeito de super-hidrofilicidade superior. Para verificar esta hipótese, neste projeto optou-se por estudar em detalhe compósitos TiO2-SiO2 mais reativos com diferentes composições (0, 20, 60 e 100 mol% de SiO2), em que a uma maior reatividade sol-gel é esperada uma redução da super-hidrofilicidade dos filmes compósitos. Com o objetivo de criar artificialmente uma morfologia rugosa/porosa, utilizaram-se neste caso camadas de esferas de poliestireno (PS) com um diâmetro médio de 0.6 μm. Com o objetivo de definir as melhores condições para obter camadas compactas 2D de esferas de PS foram estudados diferentes parâmetros no método de revestimento spin-coating. Realizaram-se experiências com diferentes velocidades de rotação (1000rpm e 500rpm). Outros parâmetros de deposição por spin-coating ajustados foram a rotação a 5000rpm/s, tempo de rotação de 1s, concentração de esferas de PS a 1wt% em EtOH, e um volume de 100μL para a solução de PS. As camadas 2D de PS foram posteriormente impregnadas em sóis de TiO2-SiO2. A utilização de esferas de PS permitiu obter filmes compósitos de TiO2-SiO2 com rugosidade aproximadamente cem vezes superior aos filmes compósitos obtidos na ausência das esferas de PS. Estas características morfológicas foram confirmadas por microscopia ótica, microcopia eletrónica (SEM) e microscopia de força atómica (AFM). Por sua vez, medições do ângulo de contacto mostraram que a hidrofilicidade aumenta após as modificações morfológicas efetuadas e, nos melhores casos (amostras com 20-60 mol% de SiO2), os ângulos de contacto de água obtidos foram inferiores a 5o, após 6 semanas de envelhecimento (sob condições ambiente). Este estudo mostrou igualmente que nestes casos existe uma relação entre: 1) o revestimento da superfície das esferas de PS, 2) a rugosidade/porosidade da superfície dos filmes S1-X+PS, e 3) a persistência da super-hidrofilicidade.
Enhanced hydrophilicity effects arising from TiO2-SiO2 granular interfaces in composite films deposited via sol-gel routes have been studied before. Results obtained so far have shown that sol-gel formulations yielding less reactive sols lead to enhanced super-hydrophilicity persistence of composite films, i.e. a water contact angle less than 10o after aging for more than 8 weeks (aging under ambient conditions without UV radiation). Taking into account the morphology of derived composite films and different surface thermodynamics models, we have suggested that a more rough/porous structure of the composite film might even increase this enhanced hydrophilicity effect. To verify this hypothesis, we have chosen to study more reactive TiO2-SiO2 composite sols with different compositions (0, 20, 60 and 100mol% of SiO2). This greater sol-gel reactivity is expected to reduce the natural super-hydrophilicity of composite films in order to better assess eventual effects of the morphology. Then, in order to artificially create rough/porous morphologies, we have used polystyrene (PS) beads with average diameter of 0.6μm. Different parameters of spin-coating deposition method were tested to define the best conditions to obtain 2D layers of closely packed PS beads. Further, two experiments with different rotation speeds (1000rpm and 500rpm) were performed. Other spin-coating conditions were fixed as follows: acceleration of 5000rpm/s, rotation time of 1s, concentration of PS beads 1wt% in EtOH, volume of PS solution 100μL. Such 2D PS layers were then impregnated with TiO2-SiO2 composite sols. Using PS beads, we have obtained TiO2-SiO2 composite films with a roughness that is almost 100 times higher than composite films without PS beads. These morphology features are confirmed by optical microscopy, AFM and FEG-SEM measurements. Water contact angle measurements show in turn that the hydrophilicity effects are increased by morphologic modifications, and in the best cases (samples with 20-60mol% of SiO2) water contact angles are close to 5o after 6 weeks of aging under ambient conditions without UV radiation. This study also shows that, in these cases, there is some relation between: 1) the surface coverage of PS beads, 2) the surface roughness/porosity of S1-X+PS films, and 3) their super-hydrophilicity persistence.
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Cacciato, Giuseppe. « Metal-TiO2 nanocomposites towards efficient solar-driven photocatalysis ». Doctoral thesis, Università di Catania, 2019. http://hdl.handle.net/10761/4182.
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Water, together with energy and food, has been addressed as one of the main urgent problem of humanity. The reduction of fresh clean water sources will definitely lead to huge issues in the next future, especially in developing countries. The conventional wastewater treatments suffer some limitations related to the effectiveness in decontamination (mechanical filtration), in the heavy use of chemicals (chlorination), or in elevate operational costs and energy requirements (desalination and reverse osmosis). In this sense, new materials such as nanocomposites may overcome these issues taking advantage of the peculiar properties of materials at nanoscale. Research on novel nanotechnologies must bring advances in order to contrast and prevent water scarcity and pollution. In order to be effective, these nanotechnologies should run at low operational cost, even in places unequipped by strong infrastructures and in concert with conventional cheap methodologies.
Among the alternative water purification methods, TiO2-based photocatalysis has attracted great attention due to material stability, abundance, non-toxicity and high decontamination efficiency. In this material, electron-hole pairs, generated by light absorption, separate from each other and migrate to catalytically active sites at the surface of the photocatalyst. Photogenerated carriers are able to induce the water splitting reaction and, consequently, to decompose organic pollutants. The main deficiency of this material, related to its large band gap, is that only the UV fraction of the solar spectrum is effective to this purpose. Several approaches have been proposed to overpass this issue and, among them, the use of metal-TiO2 nanocomposites with proper nanostructurarion seems very promising for water purification strategies.
Aim of this work is to investigate the possibility to develop efficient solar-driven TiO2 photocatalyst taking advantage of metallic nanostructures to efficiently couple the incident light to the photoactive semiconductor. Two approaches have been followed: TiO2 nanoparticles obtained via pulsed laser ablation in liquid and optical engineering of multilayered metal-TiO2 thin films. The first approach maximizes the exposed surface, thus enhancing the photocatalytic efficiency. However, in this case nanomaterials is dispersed in the surrounding environment, and in order to avoid this drawback we have investigated, as second approach, the use of metal-TiO2 thin films.
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Rossouw, Arnoux. « Modified track-etched membranes using photocatalytic semiconductors for advanced oxidation water treatment processes ». Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80276.
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Thesis (MScEng)--Stellenbosch University, 2013.ENGLISH ABSTRACT: The purpose of this study was to develop modi ed tract-etched membranes using nanocomposite TiO2 for advanced water treatment processes. Photocatalytic oxidation and reduction reactions take place on TiO2 surfaces under UV light irradiation, therefore sunlight and even normal indoor lighting could be utilised to achieve this effect. In membrane ltration, caking is a major problem, by enhancing the anti-fouling properties of photocatalysts to mineralise organic compounds the membrane life and e ciency can be improved upon. In this study the rst approach in nanocomposite membrane development was to directly modify the surface of polyethylenetherephthalate (PET) track-etched membranes (TMs) with titanium dioxide (TiO2) using inverted cylindrical magnetron sputtering (ICMS) for TiO2 thin lm deposition. The second approach was rst to thermally evaporate silver (Ag) over the entire TM surface, followed by sputtering TiO2 over the silver-coated TM. As a result a noble metal-titania nanocomposite thin lm layer is produced on top of the TM surface with both self-cleaning and superhydrophilic properties. Reactive inverted cylindrical magnetron sputtering is a physical vapour deposition method, where material is separated from a target using high energy ions and then re-assimilated on a substrate to grow thin lms. Argon gas is introduced simultaneously into the deposition chamber along with O2 (the reactive gas) to form TiO2. The photocatalytic activity and other lm properties, such as crystallinity can be in uenced by changing the sputtering power, chamber pressure, target-to-substrate distance, substrate temperature, sputtering gas composition and ow rate. These characteristics make sputtering the perfect tool for the preparation of di erent kinds of TiO2 lms and nanostructures for photocatalysis. In this work, the utilisation of ICMS to prepare photocatalytic TiO2 thin lms deposited on track-etched membranes was studied in detail with emphasis on bandgap reduction and TM surface regeneration. Nanostructured TiO2 photocatalysts were prepared through template directed deposition on track-etched membrane substrates by exploiting the good qualities of ICMS. The TiO2-TM as well as Ag-TiO2-TM thin lms were thoroughly characterised. ICMS prepared TiO2 lms were shown to exhibit good photocatalytic activities. However, the nanocomposite Ag-TiO2 thin lms were identi ed to be a much better choice than TiO2 thin lms on their own. Finally a clear enhancement in the photocatalytic activity was achieved by forming the Ag-TiO2 nanocomposite TMs. This was evident from the band-gap improvement from 3.05 eV of the TiO2 thin lms to the 2.76 eV of the Ag-TiO2 thin lms as well as the superior surface regenerative properties of the Ag-TiO2-TMs.
AFRIKAANSE OPSOMMING: Die doel van hierdie studie was om verbeterde baan-ge etste membrane (BMe) met behulp van nano-saamgestelde titaandioksied (TiO2) vir gevorderde water behandeling prosesse te ontwikkel. Fotokatalitiese oksidasie- en reduksie reaksies vind plaas op die TiO2 oppervlaktes onder UV-lig bestraling, en dus kan sonlig en selfs gewone binnenshuise beligting gebruik word om die gewenste uitwerking te verkry. In membraan ltrasie is die aanpaksel van onsuiwerhede 'n groot probleem, maar die verbetering van die self-reinigende eienskappe van fotokatalisators deur organiese verbindings te mineraliseer, kan die membraan se leeftyd en doeltre endheid verbeter word. In hierdie studie was die eerste benadering om nano-saamgestelde membraan ontwikkeling direk te verander deur die oppervlak van polyethylenetherephthalate (PET) BMe met 'n dun lagie TiO2 te bedek, met behulp van reaktiewe omgekeerde silindriese magnetron verstuiwing (OSMV).Die tweede benadering was eers om silwer (Ag) termies te verdamp oor die hele BM oppervlak, gevolg deur TiO2 verstuiwing bo-oor die silwer bedekte BM. As gevolg hiervan is 'n edelmetaal-titanium nano-saamgestelde dun lm laag gevorm bo-op die oppervlak van die BM, met beide self-reinigende en verhoogde hidro liese eienskappe. OSMV is 'n siese damp neerslag metode, waar materiaal van 'n teiken, met behulp van ho e-energie-ione, geskei word, en dan weer opgeneem word op 'n substraat om dun lms te vorm. Argon gas word gelyktydig in die neerslag kamer, saam met O2 (die reaktiewe gas), vrygestel om TiO2 te vorm. Die fotokatalitiese aktiwiteit en ander lm eienskappe, soos kristalliniteit, kan be nvloed word deur die verandering van byvoorbeeld die verstuiwingskrag, die druk in die reaksiekamer, teiken-tot-substraat afstand, substraattemperatuur, verstuiwing gassamestelling en vloeitempo. Hierdie eienskappe maak verstuiwing die ideale hulpmiddel vir die voorbereiding van die verskillende soorte TiO2 lms en nanostrukture vir fotokatalisasie. In hierdie tesis word OSMV gebruik ter voorbereiding van fotokatalitiese TiO2 dun lms, wat gedeponeer is op BMe. Hierdie lms word dan in diepte bestudeer, met die klem op bandgaping vermindering en BM oppervlak hergenerasie. Nanogestruktureerde TiO2 fotokataliste is voorberei deur middel van sjabloongerigte neerslag op BM substrate deur die ontginning van die goeie eienskappe van OSMV. Die TiO2-BM dun lms, sowel as Ag-TiO2-BM dun lms, is deeglik gekarakteriseer. OSMV voorbereide TiO2 dun lms toon goeie fotokatalitiese aktiwiteite. Nano-saamgestelde Ag-TiO2 dun lms is egter ge denti seer as 'n veel beter keuse as TiO2 dun lms. Ten slotte is 'n duidelike verbetering in die fotokatalitiese aktiwiteit bereik deur die vorming van die Ag-TiO2 nano-saamgestelde BMe. Dit was duidelik uit die bandgapingverbetering van 3,05 eV van TiO2 dun lms in vergelyking met die 2,76 eV van Ag-TiO2 dun lms. 'n Duidelike verbetering is behaal in die fotokatalitiese aktiwiteit deur die vorming van die Ag-TiO2 nano-saamgestelde TMs.
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Li, Zhelun. « Fabrication and VMD Performance of TiO2 Nanocomposite PVDF Membranes and PVDF-PTFE Composite Membranes ». Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37900.
Texte intégralRésumé :
In this study, two different strategies were carried out to modify the polyvinylidene fluoride (PVDF) distillation membrane for desalination. The first strategy was the addition of TiO2 nanoparticles into the target membranes and a synergistic effect of hydrophilic and hydrophobic nanoparticles was found for the first time in this work. And the other strategy was the introduction of another polymer material, polytetrafluoroethylene (PTFE), to the PVDF membranes to fabricate a flat sheet PVDF-PTFE composite membrane and this is the first attempt that such a membrane to be made. Two types of membranes were characterized by scanning electron microscopy (SEM) detection, porosity measurement, energy dispersive X-ray spectroscopy (EDX), Attenuated total reflectance (ATR)-Fourier transformed infrared spectroscopy (FTIR), contact angle (CA) measurement, atomic force spectroscopy (AFM) detection and liquid entry pressure of water (LEPw) measurement. Their performance was evaluated by vacuum membrane distillation (VMD) experiments. And the best VMD pure water permeate flux of the membranes fabricated under these two modify strategies could achieve 4.26 kg/m2h (M-L5-B2) and 5.61 kg/m2h (M-40), respectively, when that of pure PVDF membrane is only 0.71 kg/m2h. The salt rejection of the prepared composite membranes are all stably higher than 99.5% which demonstrate their capacity for desalination.
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Mungkalasiri, Jitti. « Elaboration par DLI-MOCVD de dépôts nanocomposites TiO2-M (M = Ag, Cu) et propriétés antibactériennes de ces surfaces solides ». Thesis, Toulouse, INPT, 2009. http://www.theses.fr/2009INPT006G/document.
Texte intégralRésumé :
La présence de bactéries et biofilms est une préoccupation permanente dans de nombreux domaines. Ils sont à l’origine de nombreux faits d’actualité qui ont un coût important pour le système de santé. L’objectif de notre travail visait à élaborer des films nanocomposite transparents contenant des particules métalliques nanométriques d'élément antibactérien (Ag ou Cu) immergées dans une matrice d’oxyde (TiO2). La méthode de dépôt DLI-MOCVD (Direct Liquid Injection-Metal Organic Chemical Vapor Deposition) a été employée pour élaborer les films composites. Ce procédé permet le contrôle de la fraction molaire des précurseurs injectés dans le réacteur CVD et de revêtir des supports 3D (poreux). La croissance et la structure du dioxyde de titane (TiO2) sont influencées par la présence du précurseur contenant l’élément antibactérien. La fraction molaire du précurseur (Ag ou Cu) modifie les caractéristiques physico chimiques et structurales des dépôts. L'activité antibactérienne est mesurée selon la norme JIS Z 2801:2000 avec S. aureus et E. coli en l’absence de lumière. Des essais antibactériens spécifiques ont été optimisés afin d'évaluer leur activité proche de condition réelle. La composition des dépôts influence fortement l’activité antibactérienne d’inactif à bactéricide. Des corrélations entre la microstructure et la composition des films et leurs propriétés antibactériennes sont discutéesThe presence of bacteria and biofilms is permanent concern in many fields. Their presences are at the origin of many events which have high costs for the health system. In this objective, this work aimed to elaborate transparent nanocomposite thin films which are composed of nanometric metallic particles of antibacterial element (Ag or Cu) embedded in an oxide matrix (TiO2). The DLI-MOCVD process (Direct Liquid Injection-Metal Organic Chemical Vapour Deposition) was used to elaborate these thin films. This process allows the quantity of precursors injected into the CVD reactor to be controlled and porous body to be coated. The growth mechanisms and the structure of the Titanium dioxide (TiO2) are influenced by the presence of the organic precursor which contains the antibacterial element. The mole fraction of precursor (Ag or Cu) modifies the physico-chemical and structural properties of films. The antibacterial activity was tested according to the standard JIS Z 2801: 2000 with S. aureus and E. coli without light Specific tests were optimised in order to evaluate their activity in environments more representative. The composition of coatings impacts strongly the antibacterial activities from inactive to bactericidal properties. Correlations between the microstructure and composition of films and their antibacterial properties are discussed
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Alrobei, Hussein. « Synthesis and Characterization of Alpha-Hematite Nanomaterials for Water-Splitting Applications ». Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7661.
Texte intégralRésumé :
The recent momentum in energy research has simplified converting solar to electrical energy through photoelectrochemical (PEC) cells. There are numerous benefits to these PEC cells, such as the inexpensive fabrication of thin film, reduction in absorption loss (due to transparent electrolyte), and a substantial increase in the energy conversion efficiency. Alpha-hematite ([U+F061]-Fe2O3) has received considerable attention as a photoanode for water-splitting applications in photoelectrochemical (PEC) devices. The alpha-hematite ([U+F061]-Fe2O3) nanomaterial is attractive due to its bandgap of 2.1eV allowing it to absorb visible light. Other benefits of [U+F061]-Fe2O3 include low cost, chemical stability and availability in nature, and excellent photoelectrochemical (PEC) properties to split water into hydrogen and oxygen. However, [U+F061]-Fe2O3 suffers from low conductivity, slow surface kinetics, and low carrier diffusion that causes degradation of PEC device performance. The low carrier diffusion of [U+F061]-hematite is related to higher resistivity, slow surface kinetics, low electron mobility, and higher electro-hole combinations. All the drawbacks of [U+F061]-Fe2O3, such as low carrier mobility and electronic diffusion properties, can be enhanced by doping, which forms the nanocomposite and nanostructure films.
In this study, all nanomaterials were synthesized utilizing the sol-gel technique and investigated using Scanning Electron Microscopy (SEM), X-ray Diffractometer (XRD), UV-Visible Spectrophotometer (UV-Vis), Fourier Transform Infrared Spectroscopy (FTIR), Raman techniques, Particle Analyzer, Cyclic Voltammetry (CV), and Chronoamperometry, respectively. The surface morphology is studied by SEM. X-Ray diffractometer (XRD) is used to identify the crystalline phase and to estimate the crystalline size. FTIR is used to identify the chemical bonds as well as functional groups in the compound. A UV-Vis absorption spectral study may assist in understanding electronic structure of the optical band gap of the material. Cyclic voltammetry and chronoamperometry were used to estimate the diffusion coefficient and study electrochemical activities at the electrode/electrolyte interface.
In this investigation, the [U+F061]-Fe2O3 was doped with various materials such as metal oxide (aluminum, Al), dichalcogenide (molybdenum disulfide, MoS2), and co-catalyst (titanium dioxide, TiO2). By doping or composite formation with different percentage ratios (0.5, 10, 20, 30) of aluminum (Al) containing [U+F061]-Fe2O3, the mobility and carrier diffusion properties of [U+F061]-hematite ([U+F061]-Fe2O3) can be enhanced. The new composite, Al-[U+F061]-Fe2O3, improved charge transport properties through strain introduction in the lattice structure, thus increasing light absorption. The increase of Al contents in [U+F061]-Fe2O3 shows clustering due to the denser formation of the Al-[U+F061]-Fe2O3 particle. The presence of aluminum causes the change in structural and optical and morphological properties of Al-[U+F061]-Fe2O3 more than the properties of the [U+F061]-Fe2O3 photocatalyst. There is a marked variation in the bandgap from 2.1 to 2.4 eV. The structure of the composite formation Al-[U+F061]-Fe2O3, due to a high percentage of Al, shows a rhombohedra structure. The photocurrent (35 A/cm2) clearly distinguishes the enhanced hydrogen production of the Al-[U+F061]-Fe2O3 based photocatalyst.
This work has been conducted with several percentages (0.1, 0.2, 0.5, 1, 2, 5) of molybdenum disulfide (MoS2) that has shown enhanced photocatalytic activity due to its bonding, chemical composition, and nanoparticle growth on the graphene films. The MoS2 material has a bandgap of 1.8 eV that works in visible light, responding as a photocatalyst. The photocurrent and electrode/electrolyte interface of MoS2-[U+F061]-Fe2O3 nanocomposite films were investigated using electrochemical techniques. The MoS2 material could help to play a central role in charge transfer with its slow recombination of electron-hole pairs created due to photo-energy with the charge transfer rate between surface and electrons. The bandgap of the MoS2 doped [U+F061]-Fe2O3 nanocomposite has been estimated to be vary from 1.94 to 2.17 eV. The nanocomposite MoS2-[U+F061]-Fe2O3 films confirmed to be rhombohedral structure with a lower band gap than Al-[U+F061]-Fe2O3 nanomaterial. The nanocomposite MoS2-[U+F061]-Fe2O3 films revealed a more enhanced photocurrent (180 μA/cm2) than pristine [U+F061]-Fe2O3 and other transition metal doped Al-[U+F061]-Fe2O3 nanostructured films.
The p-n configuration has been used because MoS2 can remove the holes from the n-type semiconductor by making a p-n configuration. The photoelectrochemical properties of the p-n configuration of MoS2-α-Fe2O3 as the n-type and ND-RRPHTh as the p-type deposited on both n-type silicon and FTO-coated glass plates. The p-n photoelectrochemical cell is stable and allows for eliminating the photo-corrosion process. Nanomaterial-based electrodes [U+F061]-Fe2O3-MoS2 and ND-RRPHTh have shown an improved hydrogen release compared to [U+F061]-Fe2O3, Al-[U+F061]-Fe2O3 and MoS2-[U+F061]-Fe2O3 nanostructured films in PEC cells. By using p-n configuration, the chronoamperometry results showed that 1% MoS2 in MoS2-[U+F061]-Fe2O3 nanocomposite can be a suitable structure to obtain a higher photocurrent density. The photoelectrochemical properties of the p-n configuration of MoS2-α-Fe2O3 as n-type and ND-RRPHTh as p-type showed 3-4 times higher (450 A/cm2) in current density and energy conversion efficiencies than parent electrode materials in an electrolyte of 1M of NaOH in PEC cells.
Titanium dioxide (TiO2) is known as one of the most explored electrode materials due to its physical and chemical stability in aqueous materials and its non-toxicity. TiO2 has been investigated because of the low cost for the fabrication of photoelectrochemical stability and inexpensive material. Incorporation of various percentages (2.5, 5, 16, 25, 50) of TiO2 in Fe2O3 could achieve better efficiencies as the photoanode by enhancing the electron concentration and low combination rate, and both materials can have a wide range of wavelength which could absorb light in both UV and visible spectrum ranges. TiO2 doped with [U+F061]-Fe2O3 film was shown as increasing contacting area with the electrolyte, reducing e-h recombination and shift light absorption along with visible region. The [U+F061]-Fe2O3-TiO2 nanomaterial has shown a more enhanced photocurrent (800 μA/cm2) than metal doped [U+F061]-Fe2O3 photoelectrochemical devices.
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COLOMBO, ANNALISA. « Synthesis and characterization of TiO2 polymeric nanocomposites with tailorable optical properties ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2012. http://hdl.handle.net/10281/28632.
Texte intégralRésumé :
Main aim of this work was the fabrication and characterization of polymeric TiO2 hybrid nanocomposites. When dispersed at the nanoscale level, TiO2 can tune the optical properties of the polymeric matrix, such as the UV absorption and the increase of refractive index, preserving the transparency in the visible and the flexibility of the polymer.
TiO2 nanopaticles were modified on the surface with different molecules; they were then dispersed in MMA and polymerized in bulk, in order to obtain optically transparent TiO2/Poly-methylmethacrylate (PMMA) sheets. The application of these objects was in the solid-state lighting field, where the nanoparticles play the role of light diffusers according to Rayleigh Scattering.
Films based on poly 2-ethyl-2-oxazoline (PEOX) and TiO2 nanoparticles with concentrations up to 44 % in weight were also prepared by casting from water solutions. Nanocomposites films remained highly transparent in the visible, and absorbed UV radiation up to the proximity of the visible range. The refractive indices of the films raised from about 1.52 to 1.65 with increasing of TiO2 concentration. The good optical properties and the solubility in water of these materials could allow their application in the paint and coating industry, and in the field of conservation of cultural heritage as consolidants or varnishes of paintings.
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Wang, Jin. « Nanoparticules à base d'oxyde de titane par pyrolyse laser : synthèse, proprietés et application au photovotaïque ». Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112222/document.
Texte intégralRésumé :
Ce travail concerne le domaine des cellules solaires sensibilisé à colorant à l’état solide et plus particulièrement le développement de nouvelles électrodes poreuses de TiO2 à base de nanocristaux synthétisés par pyrolyse laser. Deux types de poudres à base de TiO2 ont été synthétisés : TiO2 dopé à l’azote avec une teneur en azote contrôlée et des nanocomposites TiO2/MWNTC (Multi Wall Carbon Nanotubes). Dans le premier cas, le rendement des cellules élaborées varie en fonction de la teneur en N dans la poudre, cet effet étant relié à la localisation des atomes d’azote au sein du TiO2. Le dopage conduit à une augmentation du taux de recombinaison des charges. Cet effet limitant pour les performances, est partiellement compensé par une augmentation de la conductivité électrique avec le taux d’azote. Pour des taux de dopage modérés, les rendements des cellules sont ainsi sensiblement améliorés par rapport aux cellules à base de TiO2 non dopé. Concernant les nanocomposites TiO2/MWNTC, la synthèse par pyrolyse en une étape à partir d’une suspension contenant des MWCNT conduit à une dispersion très homogène des nanotubes au sein de la poudre de TiO2. La méthode favorise de plus l’enrobage des nanotubes par les particules d’oxyde, conduisant à des interactions électroniques efficaces. Les cellules solaires élaborées à partir de ce composite présentent des rendements améliorés de près de 20% par rapport aux cellules de référence. Cette amélioration est principalement attribuée à un drainage des charges photo-générées vers les électrodes favorisé en présence des nanotubes qui s’accompagne d’une réduction sensible des phénomènes de recombinaisonThis work is related to the development of new TiO2 porous photo-electrodes based on nanopowders synthesized by laser pyrolysis for application in solid-state dye-sensitized solar cells. Two different types of TiO2 powders were synthesized: TiO2 nanoparticles doped with different levels of nitrogen, and TiO2/MWNTC (Multi Wall Carbon Nanotubes) nanocomposites. In the first case, the efficiency of the solar cells is dependent on the nitrogen amount in the powder, in relation with the localization of the dopants in the TiO2 structure. High nitrogen contents are associated with high defect densities at the TiO2 nanoparticle surface, leading to intense charge recombination. Although this effect limits the performance of the cells, it can be counterbalanced by an increased electrical conductivity due to the presence of N atoms. Finally, for moderate doping levels, the incorporation of nitrogen can improve the efficiency of the cells, compared to reference devices. Regarding the use of TiO2/MWNTC nanocomposites, the one step synthesis by laser pyrolysis from a precursor mixture including MWNTC leads to nanopowders where nanotubes appear very homogeneous dispersed of. The nanotubes are also highly coated with TiO2 particles, improving their electrical interactions with the TiO2 particles. The efficiencies of the solar cells made from such composites are found to be 20% larger than that of reference cells. This improvement is mainly attributed to faster charge collection and reduced charge recombination rates
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Shabani-Nooshabadi, M., et Y. Jafari. « Electropolymerized Coatings of Poly (o-anisidine) and Poly (o-anisidine)-TiO2 Nanocompsite on Aluminum Alloy 3004 by using the Galvanostatic Method and Their Corrosion Protection Performance ». Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/34811.
Texte intégralRésumé :
Poly (o-anisidine) (POA) and also poly (o-anisidine)-TiO2 (POA-TiO2) nanocomposite coatings on aluminum
alloy 3004 (AA3004) have been investigated by using the galvanostatic method. The electrosynthesized
coatings were characterized by FT-IR, SEM- EDX, SEM and AFM. The corrosion protection performances
of POA and also POA-TiO2 nanocomposite coatings were investigated in 3.5% NaCl solution by using
the potentiodynamic polarization technique and electrochemical impedance spectroscopy (EIS). The
corrosion rate of nanocomposite coatings was found ∼900 times lower than bare AA3004. The results of
this study clearly ascertain that the POA-TiO2 nanocomposite has outstanding potential to protect the
AA3004 against corrosion.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/34811
Chapitres de livres sur le sujet "TiO2 nanocomposite"
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Ochando-Pulido, Javier Miguel, José Raúl Corpas-Martínez, Marco Stoller et Antonio Martínez-Férez. « Organic/TiO2 Nanocomposite Membranes : Recent Developments ». Dans Organic-Inorganic Composite Polymer Electrolyte Membranes, 25–46. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52739-0_2.
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Chkirida, Soulaima, Nadia Zari, Abou El Kacem Qaiss et Rachid Bouhfid. « Nanocomposite Materials Based on TiO2/Clay for Wastewater Treatment ». Dans Advanced Research in Nanosciences for Water Technology, 363–80. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-02381-2_16.
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Singh, Simranjit, et Monika Joshi. « Synthesis of Ag/TiO2 Nanocomposite for Waste Water Treatment ». Dans Springer Proceedings in Physics, 1277–83. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-97604-4_194.
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Favier, Lidia, et Maria Harja. « TiO2/Fly Ash Nanocomposite for Photodegradation of Organic Pollutant ». Dans Handbook of Nanomaterials and Nanocomposites for Energy and Environmental Applications, 3051–74. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-36268-3_11.
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Lidia, Favier, et Harja Maria. « TiO2/Fly Ash Nanocomposite for Photodegradation of Organic Pollutant ». Dans Handbook of Nanomaterials and Nanocomposites for Energy and Environmental Applications, 1–24. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-11155-7_11-1.
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Favier, Lidia, et Maria Harja. « TiO2/Fly Ash Nanocomposite for Photodegradation of Organic Pollutant ». Dans Handbook of Nanomaterials and Nanocomposites for Energy and Environmental Applications, 1–24. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-11155-7_11-2.
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Saini, Shalu, Anil Lodhi, Anurag Dwivedi, Arpit Khandelwal et Shree Prakash Tiwari. « Resistive Switching Behavior of TiO2/(PVP:MoS2) Nanocomposite Bilayer Hybrid RRAM ». Dans Communications in Computer and Information Science, 478–85. Cham : Springer Nature Switzerland, 2022. http://dx.doi.org/10.1007/978-3-031-21514-8_39.
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Radhika, T. « Cellulose Acetate-TiO2-Based Nanocomposite Flexible Films for Photochromic Applications ». Dans Natural Polymers, 251–81. Boca Raton : Apple Academic Press, 2022. http://dx.doi.org/10.1201/9781003130765-10.
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Chate, Vaibhav R., Soumya Meti, M. S. Veeresh, M. B. Shivaraj, Utsav Naik et Raviraj M. Kulkarni. « Removal of Pharmaceutical Drug from Water Using Activated Kaolinite–TiO2 Nanocomposite ». Dans Lecture Notes in Civil Engineering, 355–64. Singapore : Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8293-6_30.
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Sunidhi et Surinder Singh. « Photocatalytic Degradation of Amaranth Dye from Water Using TiO2-BiOI Nanocomposite ». Dans Advances in Chemical, Bio and Environmental Engineering, 879–96. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-96554-9_58.
Texte intégralActes de conférences sur le sujet "TiO2 nanocomposite"
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Ge, Ming, Assaf Azouri, Kun Xun, Klaus Sattler, Joe Lichwa et Chittaranjan Ray. « Solar Photocatalytic Degradation of Atrazine in Water by TiO2/Ag Nanocomposite ». Dans ASME 2006 Multifunctional Nanocomposites International Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/mn2006-17070.
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One of the most common herbicides in the world, Atrazine, was used as a model pollutant in this study. The photocatalytic activities of the nanocomposite of TiO2/Ag, with nanopaticles of TiO2 and Ag, were investigated by photodegradation of atrazine under the natural sun. It was found that the efficiency of solar-photocatalytic activity was increased significantly by using the nanocomposites of TiO2/Ag, compared to the use of TiO2 alone. The mechanism of the TiO2/Ag composite for enhancement of photocatalytic activity was elucidated in this work.
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Khodaparast, Payam, et Zoubeida Ounaies. « Preparation of TiO2 Polymer Nanodielectrics via a Solvent-Based Technique ». Dans ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2010. http://dx.doi.org/10.1115/smasis2010-3883.
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The effect of adding surface-functionally treated TiO2 nanoparticles on dielectric properties of PVDF matrix was investigated. Porosity of the nanocomposite films showed to have an impact on dielectric permittivity results. Thermal annealing was proposed as an effective way to overcome the porosity problem. By combination of surface treatment of particles and thermal annealing of nanocomposite films, considerable enhancement in dielectric permittivity of TiO2-PVDF nanocomposites was achieved. The experimental results were far higher than theoretical values based on Maxwell model, indicating the presence of an active interphase with high dielectric constant in the system.
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Mallick, Shoaib, Zubair Ahmad et Farid Touati. « Polymer Nanocomposite-based Moisture Sensors for Monitoring of the Water Contents in the Natural Gas Pipelines ». Dans Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0073.
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In this study, the polymer-based humidity sensors were investigated for humidity sensing applications. The key advantages of polymers that have garnered this attraction are their lightweight, easy preparation, and low cost of both materials and fabrication process. Different techniques are used to enhance the surface morphology and sensitivity of polymeric films, which include synthesis of nanocomposites, copolymerization techniques, and blending of polymers. The incorporation of nanoparticles to the polymer matrix improves the electrical and mechanical properties of the polymeric film. We have investigated different polymer nanocomposites based humidity sensors on enhancing the sensitivity of the sensor, on achieving faster response and recovery time and lower hysteresis loss as compared to the polymeric humidity sensors. In the first phase, we investigated the PLA-TiO2 nanocomposite for humidity sensing applications. We have optimized the concentration of TiO2 in the PLA-TiO2 nanocomposite and apply acetone for the surface treatment of the sensing film. In the second phase, we studied the PVDF-TiO2 nanocomposite-based humidity sensor, achieved a linear response of the sensor, and optimized the concentration of PVDF. In the third phase, we incorporated the BaTiO3 nanoparticles within optimized PVDF and studied the dielectric property of the nanocomposite film. PVDF-BaTiO3 sensors show a smaller hysteresis response. In the 4th phase, we blend the PVDF with SPEEK polymer; the optimized concentration of SPEEK improves the sensitivity of the humidity sensors at a lower humidity level.
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Wyrzykowska, Ewelina, Alicja Mikolajczyk, Joanna Nadolna et Tomasz Puzyn. « Photocatalytic Activity of Er-TiO2 Nanocomposite ». Dans The 2nd World Congress on Recent Advances in Nanotechnology. Avestia Publishing, 2017. http://dx.doi.org/10.11159/icnms17.106.
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HUDIKA, Tomislav, Tomislav CIGULA et Marina VUKOJE. « ANTIMICROBIAL PROPERTIES OF TiO2 NANOCOMPOSITE COATING ». Dans NANOCON 2021. TANGER Ltd., 2021. http://dx.doi.org/10.37904/nanocon.2021.4345.
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Hudika, Tomislav, Tomislav Cigula, Mihaela Žličarić et Maja Strižić Jakovljević. « PCL-TiO2 nanocomposite to improve ageing of offset prints ». Dans 10th International Symposium on Graphic Engineering and Design. University of Novi Sad, Faculty of technical sciences, Department of graphic engineering and design,, 2020. http://dx.doi.org/10.24867/grid-2020-p10.
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UV radiation or sunlight can affect the printed sample by fading the ink surface and therefore the product losses it's decorative purpose and becomes less desirable to the customer. To create the efficient protective coating, titanium dioxide (TiO2) will be used as a well-known compound that should lower the effects of UV radiation. TiO2 should lower the colour fade after UV radiation and this will be determined by densitometric and colorimetric (CIE L*a*b*) measurements. In addition, measurement of print gloss will also be conducted to evaluate visual appearance of the sample. Biopolymer Polycaprolactone (PCL) was the base of the PCL-TiO2 composite in which TiO2 nano sized. To determine influence of the amount of TiO2, three composites were prepared by adding different weight ratio of the TiO2. The prepared nanocomposites were then applied onto the offset prints on gloss art print paper and on the uncoated paper. The results have shown that TiO2 coating does affect ink’s density, colorimetric properties and print gloss after initial coating. The change in chroma due to the accelerated ageing is most visible on yellow ink, cyan and magenta proved to be the more stable. Accelerated ageing caused change in the L* of black. On all colours, increase of the TiO2 weight ratio improved resistance of colour to change. Coated gloss paper was more resistant to density change where uncoated had lower change in chroma. It could be concluded that TiO2 has the ability to protect the prints in the measured time interval but it has to be noted that concentration of the TiO2 particles also causes colour difference and must be observed when defining composure of the nanocomposite.
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Panagiotaras, Dionisios, Eleni Kaplani, Elias Stathatos et Dimitrios Papoulis. « Self-cleaning properties of TiO2/palygorskite and TiO2/halloysite nanocomposite coatings ». Dans INTERNATIONAL CONFERENCE OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING 2014 (ICCMSE 2014). AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4897748.
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Rajan Prakash, R., S. Pandiarajan, P. Venkatesh et N. Kamaraj. « Performance analysis of PMMA - TiO2 nanocomposite dielectrics ». Dans 2011 International Conference on Emerging Trends in Electrical and Computer Technology (ICETECT 2011). IEEE, 2011. http://dx.doi.org/10.1109/icetect.2011.5760089.
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Lazarouk, S. K., A. A. Leshok, D. A. Sasinovich, V. E. Borisenko et S. V. Shvedov. « Multilayer waveguide based on nanocomposite Al2O3/TiO2 ». Dans 2010 20th International Crimean Conference "Microwave & Telecommunication Technology" (CriMiCo 2010). IEEE, 2010. http://dx.doi.org/10.1109/crmico.2010.5632525.
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Ivanenko, Iryna, Khrystyna Hutsul et Yurii Fedenko. « Nanocomposite TiO2-ZnO for Dyes Photocatalytic Degradation ». Dans 2021 IEEE 11th International Conference Nanomaterials : Applications & Properties (NAP). IEEE, 2021. http://dx.doi.org/10.1109/nap51885.2021.9568504.
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