Готові списки джерел за темами / PVA Nanocomposite

Добірка наукової літератури з теми "PVA Nanocomposite"

Автор: Grafiati
Опубліковано: 7 вересня 2023

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Статті в журналах з теми "PVA Nanocomposite"

1

Fujino, Shigeru, and Hiroshi Ikeda. "Room Temperature Imprint Using Crack-Free Monolithic SiO2-PVA Nanocomposite for Fabricating Microhole Array on Silica Glass." Journal of Nanomaterials 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/584320.

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This paper aims to fabricate microhole arrays onto a silica glass via a room temperature imprint and subsequent sintering by using a monolithic SiO2-poly(vinyl alcohol) (PVA) nanocomposite as the silica glass precursor. The SiO2-PVA suspension was prepared from fumed silica particles and PVA, followed by drying to obtain tailored SiO2-PVA nanocomposites. The dependence of particle size of the fumed silica particles on pore size of the nanocomposite was examined. Nanocomposites prepared from 7 nm silica particles possessed suitable mesopores, whereas the corresponding nanocomposites prepared from 30 nm silica particles hardly possessed mesopores. The pore size of the nanocomposites increased as a function of decreasing pH of the SiO2-PVA suspension. As a consequence, the crack-free monolithic SiO2-PVA nanocomposite was obtained using 7 nm silica particles via the suspension at pH 3. Micropatterns were imprinted on the monolithic SiO2-PVA nanocomposite at room temperature. The imprinted nanocomposite was sintered to a transparent silica glass at 1200°C in air. The fabricated sintered glass possessed the microhole array on their surface with aspect ratios identical to the mold.
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2

Purwandari, Vivi, and Malemta Tarigan. "PREPARASI FILM NANOKOMPOSIT POLIVINIL ALKOHOL (PVA)/NANOKARBON DARI CANGKANG BUAH SAWIT (NCCS) DENGAN METODE PENCAMPURAN LARUTAN." JURNAL KIMIA SAINTEK DAN PENDIDIKAN 6, no. 1 (July 24, 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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Bandyopadhyay, Abhijit, Mousumi De Sarkar, and Anil K. Bhowmick. "Solution Rheology of Poly(vinyl alcohol)/Silica Hybrid Nanocomposites." Polymers and Polymer Composites 13, no. 5 (July 2005): 429–42. http://dx.doi.org/10.1177/096739110501300501.

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The solution behavior of polymer/silica hybrid nanocomposites was investigated using a Brookfield viscometer. The nanocomposites were prepared using the sol-gel technique with tetraethoxysilane (TEOS) as the precursor for silica. The sol-gel reaction was carried out in the pH range of 1.0-2.0, which was maintained by the addition of concentrated HCl. Poly (vinyl alcohol) (PVA)/silica nanocomposites demonstrated a bigger rise in solution viscosity after continuous measurement for five days than either- acrylic rubber (ACM)/silica or epoxidised natural rubber (ENR)/silica nanocomposites. Detailed investigation of the PVA/silica system indicated that it exhibited Newtonian behaviour when the solutions contained (5 or 7.5 wt% of PVA,) even when increasing the TEOS concentration to 50 wt%, although at one particular TEOS concentration (10 wt%), the nanocomposite was pseudoplastic when the concentration of PVA was increased to 10 wt%. The reinforcement factor [Formula: see text] for those PVA/silica hybrid nanocomposites containing 5 wt% of PVA deviated strongly from the Guth-Smallwood prediction. Instead they obeyed a relationship of the type ηmax = η0(1 + aϕb), where a = 4.45 and b = 0.38, calculated for this system. The viscosity decreased with increasing temperature for both PVA and the representative nanocomposite with 30 wt% TEOS (PVA30), although the activation energy for flow of the nanocomposite did not vary to a great extent.
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Wang, Mengqing, Yanling Xu, Haihu Tan, Lijian Xu, Changfan Zhang, and Jianxiong Xu. "Multicolor Luminescent Anti-Counterfeiting Barcode Based on Transparent Lanthanide-Doped NaYF4/Poly(Vinyl Alcohol) Nanocomposite with Tunable Full-Color Upconversion Emission." Nanoscience and Nanotechnology Letters 10, no. 3 (March 1, 2018): 365–72. http://dx.doi.org/10.1166/nnl.2018.2631.

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In this paper, we report the synthesis of transparent lanthanide-doped NaYF4 phosphors/poly(vinyl alcohol) (UCPs/PVA) nanocomposites with full-color upconversion emission for construction of multicolor luminescent anti-counterfeiting barcode. By deliberate design of water-dispersible lanthanidedoped NaYF4 upconversion phosphors and precise control of the doped lanthanide ions (dopant pairs and molar ratio), three-primary RGB UCPs with fine red, green and blue upconversion emission were synthesized. The as-prepared three-primary RGB UCPs were incorporated into poly(vinyl alcohol) (PVA) matrix at a fixed concentration to balance the transparence and fluorescence intensity of the UCPs/PVA nanocomposite. The combination of emissions from different types of UCPs with selected ratios in PVA matrix was used to prepare UCPs/PVA nanocomposite with various upconversion emissions. It was demonstrated that the separation distance between UCPs was large enough to suppress inter-particle energy transfer, and thus the emissions of each UCPs were well preserved. This facilitated the fabrication of UCPs/PVA nanocomposite with tunable full-color upconversion emission based on the trichromatic additive color theory. The relevance of these multicolor UCPs/PVA nanocomposites to barcode materials and application in anti-counterfeiting field were also confirmed.
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5

Wu, Ming-Chung, Shun-Hsiang Chan, and Ting-Han Lin. "Fabrication and photocatalytic performance of electrospun PVA/silk/TiO2 nanocomposite textile." Functional Materials Letters 08, no. 03 (June 2015): 1540013. http://dx.doi.org/10.1142/s1793604715400135.

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Many organic/inorganic nanocomposites have been fabricated into fibrous materials using electrospinning techniques, because electrospinning processes have many attractive advantages and the ability to produce relatively large-scale continuous films. In this study, the polyvinyl alcohol (PVA)/silk/titanium dioxide ( TiO 2) nanocomposite self-cleaning textiles were successfully produced using electrospinning technique. After optimizing electrospinning conditions, we successfully obtained the PVA/silk/ TiO 2 nanocomposite fibers with average diameter of ∼220 nm and TiO 2 concentration can be as high as 18.0 wt.%. For the case of the PVA/silk/ TiO 2 nanocomposite textile, the color of brilliant green coated on the textile surface changed from the initial green color to colorless after ultraviolet (UV) irradiation. Because of its worthy photocatalytic performance, the developed PVA/silk/ TiO 2 nanocomposite materials in this study will be beneficial for the design and fabrication of multifunctional fibers and textiles.
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6

Mohaimeed, Ameen alwan. "The Study the Influence of TiO2-Nanoparticles Doped in Polyvinyl Alcohol by Measuring Optical Properties of PVA Films." Iraqi Journal of Nanotechnology, no. 3 (October 14, 2022): 59–70. http://dx.doi.org/10.47758/ijn.vi3.62.

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It was investigated how titanium dioxide nanoparticles affected the optical properties of polyvinyl alcohol. Polymer nanocomposites (PVA-TiO2) are created via stirring and casting. The results demonstrate that transmittance improves from 75% to 95% while titanium dioxide concentration enhances the absorbance of nanocomposites. Nanocomposite films made of PVA and TiO2 had reflectance values of 12 and 16 percent (weight percent=0.15 and 0.85%).The refractive index and coefficient of extinction rise with increasing density, and optical absorption and photon dispersion in the nanocomposite (PVA-TiO2) also rise as the concentration of titanium dioxide nanoparticles rises. Real dielectric (r) and imaginary dielectric I constants also rise as titanium dioxide nanoparticle concentration does. The results show that when the weight % of (TiO2) nanoparticles increased, the energy gap decreased from 3.32 to 2.23. Additionally, optical conductivity increased with the concentration of (TiO2) NPs. Nanocomposites of PVA and TiO2 are essential for optical applications.
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7

Yilmaz Dogan, Hazal, Yasin Altin, and 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 (January 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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Cobos, Mónica, M. Fernández, and M. Fernández. "Graphene Based Poly(Vinyl Alcohol) Nanocomposites Prepared by In Situ Green Reduction of Graphene Oxide by Ascorbic Acid: Influence of Graphene Content and Glycerol Plasticizer on Properties." Nanomaterials 8, no. 12 (December 6, 2018): 1013. http://dx.doi.org/10.3390/nano8121013.

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Анотація:
The enhanced properties of polymer nanocomposites as compared with pure polymers are only achieved in the presence of well-dispersed nanofillers and strong interfacial adhesion. In this study, we report the preparation of nanocomposite films based on poly(vinyl alcohol) (PVA) filled with well dispersed graphene sheets (GS) by in situ reduction of graphene oxide (GO) dispersed in PVA solution using ascorbic acid (L-AA) as environmentally friendly reductant. The combined effect of GS content and glycerol as plasticizer on the structure, thermal, mechanical, water absorption, and water barrier properties of PVA/GS nanocomposite films is studied for the first time. Higher glass transition temperature, lower crystallinity, melting, and crystallization temperature, higher mechanical properties, and remarkable improvement in the thermal stability compared to neat PVA are obtained as a result of strong interfacial interactions between GS and PVA by hydrogen bonding. PVA/GS composite film prepared by ex situ process is more brittle than its in situ prepared counterpart. The presence of GS improves the water barrier and water resistance properties of nanocomposite films by decreasing water vapor permeability and water absorption of PVA. This work demonstrates that the tailoring of PVA/GS nanocomposite properties is enabled by controlling GS and glycerol content. The new developed materials, particularly those containing plasticizer, could be potential carriers for transdermal drug delivery.
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Noshirvani, Nooshin, Babak Ghanbarzadeh, Hadi Fasihi, and Hadi Almasi. "Starch–PVA Nanocomposite Film Incorporated with Cellulose Nanocrystals and MMT: A Comparative Study." International Journal of Food Engineering 12, no. 1 (February 1, 2016): 37–48. http://dx.doi.org/10.1515/ijfe-2015-0145.

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Abstract The goal of this work was to compare the barrier, mechanical, and thermal properties of two types of starch–polyvinyl alcohol (PVA) nanocomposites. Sodium montmorillonite (MMT) and nanocrystalline cellulose were chosen as nanoreinforcements. X-ray diffraction (XRD) test showed well-distributed MMT in the starch–PVA matrix, possibly implying that the clay nanolayers formed an exfoliated structure. The moisture sorption, solubility and water vapor permeability (WVP) studies revealed that the addition of MMT and nanocrystalline cellulose reduced the moisture affinity of starch–PVA biocomposite. At the level of 7 % MMT, the nanocomposite films showed the highest ultimate tensile strength (UTS) (4.93 MPa) and the lowest strain to break (SB) (57.65 %). The differential scanning calorimetry (DSC) results showed an improvement in thermal properties for the starch–PVA–MMT nanocomposites, but not for the starch–PVA–NCC nanocomposites. Results of this study demonstrated that the use of MMT in the fabrication of starch–PVA nanocomposites is more favorable than that of nanocrystalline cellulose to produce a desirable biodegradable film for food packaging applications.
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Cho, Beom-Gon, Shalik Ram Joshi, Seongjin Lee, Shin-Kwan Kim, Young-Bin Park, and Gun-Ho Kim. "Enhanced Mechanical and Antibacterial Properties of Nanocomposites Based on Poly(vinyl Alcohol) and Biopolymer-Derived Reduced Graphene Oxide." Polymers 13, no. 4 (February 18, 2021): 615. http://dx.doi.org/10.3390/polym13040615.

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Functionalized graphene–polymer nanocomposites have gained significant attention for their enhanced mechanical, thermal, and antibacterial properties, but the requirement of multi-step processes or hazardous reducing agents to functionalize graphene limits their current applications. Here, we present a single-step synthesis of thermally reduced graphene oxide (TrGO) based on shellac, which is a low-cost biopolymer that can be employed to produce poly(vinyl alcohol) (PVA)/TrGO nanocomposites (PVA–TrGO). The concentration of TrGO varied from 0.1 to 2.0 wt.%, and the critical concentration of homogeneous TrGO dispersion was observed to be 1.5 wt.%, below which strong interfacial molecular interactions between the TrGO and the PVA matrix resulted in improved thermal and mechanical properties. At 1.5 wt.% filler loading, the tensile strength and modulus of the PVA–TrGO nanocomposite were increased by 98.7% and 97.4%, respectively, while the storage modulus was increased by 69%. Furthermore, the nanocomposite was 96% more effective in preventing bacterial colonization relative to the neat PVA matrix. The present findings indicate that TrGO can be considered a promising material for potential applications in biomedical devices.
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Більше джерел

Дисертації з теми "PVA Nanocomposite"

1

Busu, Alice. "Development of PVA/PDA nanocomposite membranes for CO2 capture." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Анотація:
In this project, composite membranes containing nanoparticles of polydopamine PDA (dopamine polymer) will be manufactured and characterized in view of their use for the separation of CO2. Polysulfone will be used as a polymer matrix support while poly(vinyilalcohol) has been chosen as selective layer material. The work will first focus on the optimization of the manufacturing parameters of nano composite membranes and then on the influence of the integration of PDA nanoparticles in the polymeric support at different concentrations. The final objective is to test the material properties, with particular reference to the separation performances of the membranes produced, and critically comment on the results obtained.
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2

Coskun, Temmuz. "Investigating solid-state supercapacitors constructed with PVA/CNT nanocomposite electrolytes." Thesis, Wichita State University, 2014. http://hdl.handle.net/10057/10951.

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The search for alternative energy generation methods requires development for new energy storage methods as well. The ability to use nanotechnology to achieve high surface area, which is correlated to increased energy storage, brought advancements in supercapacitor applications. Supercapacitors have the potential to charge and discharge quickly and hold as much energy as batteries and other chemical storage devices. By having a completely solid-state supercapacitor, problems with leakage and decay could be avoided. Supercapacitors were assembled from electrodes made by reducing graphene oxide in a computer disc drive and adhering two electrodes with composite electrolytes having various concentrations of PVA/CNT. Tests were performed on the completed supercapacitors, as well as the individual components. The analysis of the different concentrations of carbon nanotubes in PVA electrolytes showed the lowest resistivity for 0.5wt% CNT (294 Omega cm) and the highest specific capacitance for 1.0wt% CNT (123.5 F/g). This specific capacitance is a 27% improvement on an electrolyte without CNT. The electrolyte with pure PVA has similar capacitance to other solid-state supercapacitors in the literature. Electrolytes with higher percentages of CNT (0.5%) show higher resistivity because of the decreased carbon solubility or agglomerations. The final product supercapacitors, thin, flexible, and environmentally friendly, can be used in wide temperature ranges, and have a theoretically long lifespan. They can charge more quickly than batteries, and hold more energy than capacitors. This study shows promising enhancements in solid-state supercapacitors, making them an even more plausible replacement for batteries in the near future. The improvements made on the specific capacitance with the different electrolytes could lead to greater efficiency and lower cost in many unique applications requiring absence of liquid components.
Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Mechanical Engineering
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3

Gaume, Julien. "Etude du photovieillissement de matériaux nanocomposites pour l'encapsulation de cellules solaires organiques." Thesis, Clermont-Ferrand 2, 2011. http://www.theses.fr/2011CLF22173.

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Ce travail est consacré à l‟étude de la stabilité photochimique de nanocomposites polymère / argile en vue de leur insertion dans un système multicouche organique / inorganique pour l‟encapsulation des cellules solaires organiques. L‟objectif est d‟obtenir des films de nanocomposites polymère / argile flexibles, transparents, pouvant être mis en oeuvre par voie liquide, et photochimiquement stables. Dans une première partie, la caractérisation de nanocomposites à base d‟alcool polyvinylique (PVA) a montré leur aptitude à être insérés dans un système multicouche, notamment en ce qui concerne les propriétés barrière aux gaz. L‟étude du comportement photochimique du PVA basée sur l‟identification des produits de dégradation a permis de proposer un mécanisme de photooxydation du PVA et de déterminer les effets du photovieillissement sur les propriétés du film (rugosité, perméabilité, transparence). L‟insertion de nanocharges lamellaires (Montmorillonite, Laponite ou Hydroxydes Doubles Lamellaires) dans le PVA induit des effets différents (prodégradant ou stabilisant) en fonction de la nature de l‟argile (naturelle ou synthétique). Cependant, lors d‟irradiations en absence d‟oxygène, le PVA et les nanocomposites PVA / argile sont très stables. Enfin, l‟encapsulation alternant couche inorganique SiOx et couche organique PVA ou nanocomposite PVA / argile, permet d‟atteindre les niveaux de perméation requis pour les cellules solaires organiques pour des applications nomades
This work was devoted to the study of the photochemical behavior of polymer / clay nanocomposites with the aim to use these nanocomposites in a multilayer organic / inorganic coating for organic solar cells encapsulation. The goal of this work was to obtain polymer / clay nanocomposite films that are flexible, transparent, which can be processed by solution, and that are photochemically stable. In the first part, the characterization of nanocomposites based on polyvinyl alcohol (PVA) has shown their ability to be inserted into a multilayer system, particularly for gas barrier properties. The study of the photochemical behavior of PVA with the identification of photodegradation products allows us to propose a photooxidation mechanism of PVA and to determine the effects of photoageing on the film properties (roughness, permeability, transparency). The insertion of lamellar nanofillers (Montmorillonite, Laponite or Layered Double Hydroxide) in PVA induces different effects (prodegradant or stabilising) depending on the nature of the clay (natural or synthetic). However, in absence of oxygen, the PVA and PVA / clay nanocomposites are very photostable. Finally, encapsulation alternating inorganic SiOx layer and PVA or PVA / clay nanocomposite layer permits to obtain the permeability levels required for organic solar cells in niche markets (consumer electronics)
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4

Mabrouk, Mohamed Mostafa. "Preparation of PVA / Bioactive Glass nanocomposite scaffolds : in vitro studies for applications as biomaterials : association with active molecule." Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S063/document.

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Le Poly Vinyl Alcohol (PVA) a été associé aux verres élaborés dans un système quaternaire (BG) 46S6 par les procédés cités (fusion, sol-gel et sacffolds). Différents paramètres intervenant dans les synthèses des verres bioactifs ont été étudiés, nous citons à titre d’exemple : la température, le pH, la taille des particules, le rapport Polymère / verres, la microstructure, la porosité et la biodégradation. Les caractéristiques thermiques des verres élaborés ont été également déterminées après chaque synthèse par analyse thermique différentielle (DSC/TG, DTA/TG). Ainsi, la température de fusion, la température de transition vitreuse et la température de cristallisation ont été élucidées. Ces caractéristiques thermiques changent lorsque la composition chimique du verre est modifiée. A ce titre, les compositions chimiques ont été étudiées par Fluorescence (XRF) et Inductively Coupled Plasma-Opticale Emission Spectroscopy (ICP-OES) après chaque synthèse pour s’assurer de la pureté des verres bioactifs élaborés et destinés à des applications médicales. Plusieurs techniques physico chimiques d’analyses (DRX, MEB, MET, FT-IR, XRF, ICPOES) ont été mises en oeuvre pour déterminer les propriétés physico chimiques de nos verres bioactifs avant et après expérimentations « in vitro ». Le nano composite Polymère-Verres scaffolds que nous avons obtenu présente des particules de tailles comprises entre 40 et 61 nm et une porosité d’environ 85%. La biodégradation des verres scaffolds décroît lorsque la teneur en verre scaffolds dans le nano composite croît. Les expérimentations « in vitro » montrent qu’après immersion de ces nano composites dans un liquide physiologique synthétique (SBF), une couche d’apatite (phosphate de calcium) se forme à leur surface. L’épaisseur de la couche formée dépend clairement de la taille des particules et du rapport polymère / verre scaffolds
The aim of the present work is the preparation of Bioactive Glass (BG) 46S6 by different techniques. Fabrication of composite scaffolds by using of Poly Vinyl Alcohol (PVA) and quaternary BG (two methods melting and sol-gel) with different ratios to the prepared scaffolds was carried out. Different factor affecting the final properties of the prepared composite scaffolds were investigated in this study, such as; temperature of treatment, BG particle size, polymer/glass ratio, microstructure, porosity, biodegradation, bioactivity, and drug release. The thermal behavior of the prepared bioactive glass by sol-gel and melting techniques were identified using Differential Scanning Calorimetric/Thermo Gravimetric (DSC/TG) or Differential Thermal Analysis/Thermo Gravimetric (DTA /TG). The elemental composition of the prepared bioactive glasses was determined by X-rays Fluorescence (XRF) to confirm that the prepared bioactive glasses have the same elemental compositions and high purity for biomedical applications. The particle size of the prepared bioactive glass was determined by Transmission Electron Microscopic (TEM). Nano-bioactive glass could be obtained by modified sol-gel and the obtained particle size ranged between 40 to 61 nm. The prepared bioactive glass by both applied methods has the same amorphous phase and all identified groups as well as. The porous scaffold has 85% porosity with a slight decrease by increasing the glass contents. The degradation rate decreased by increasing of glass content in the prepared scaffolds. The bioactivity of the prepared composite scaffolds was evaluated by XRD, FTIR, SEM coupled with EDX and Inductively Coupled Plasma-Optical Emission Spectroscopic (ICP-OES). It has been observed that after soaking in Simulated Body Fluid (SBF), there was an apatite layer formed on the surface of the prepared samples with different thickness depending on the glass particle size and polymer/glass ratio
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5

Silva, Dany Geraldo Kramer Cavalcanti e. "Desenvolvimento de nanocomp?sito (hidroxiapatita/ poliuretano) pela gela??o (gelling) de poli ( ?lcool vin?lico) (PVA) para remo??o de metais pesados." Universidade Federal do Rio Grande do Norte, 2013. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15605.

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Removing microcontaminants from effluents is a challenge today, because of its high cost and low efficiency, especially in the treatment of effluents containing heavy metals. An alternative that has emerged is the use of biodegradable nanocomposites, which exhibit good removal and recovery performances, in addition to its low cost. With this in mind, the present study aimed to develop and characterize a nanocomposite based on hydroxyapatite (HAP), polyurethane (PU) and polyvinyl alcohol (PVA) for removing heavy metals. Thus, the research was conducted in several steps: i)- Physico-chemical and microbiological hospital effluent characterization; ii)- Production of hydroxyapatite by aqueous precipitation technique, and their characterization; iii)- Production of the nanocomposite in which the hydroxyapatite was added to the polyurethane prepolymers and then the polyvinyl alcohol/hydroxyapatite film was produced; iv)- Polyvinyl composite without film PU/HAp was also produced in the proportions of 20 and 40% HAp; v)- The composites was characterized by the techniques of XRD, FTIR, SEM / EDS, BET, Zeta Potential and TGA; vi)- The sisal and coconut fibres were washed and dried for comparative tests of adsorption; vii)- Adsorption tests for evaluating the removal of heavy metals (nickel and cadmium). Initial screening adsorption capacity (HAp; PU/HAp - 20 and 40%; PU / HAp / PVA), kinetic studies of adsorption of Cd (II) by HAp; multifactorial design analysis (factorial design) for identifying the most important variables in the adsorption of Cd (II) by composite PU/HAp. Also comparative analysis of adsorption of Cd and Ni by composite PU/HAp were conducted, as well as comparative tests of adsorption of Cd (coconut fibre) and Ni (sisal fibre). It was possible to verify that the composite PU/HAp 40% showed better effectiveness for the removal of Cd (II) and Ni (II), above 80%, equivalent to the lignocellulosic fibre used and HAp produced. As main conclusion, it can be referred that the composite PU/HAp 40% is an effective adsorvent to wastewater treatment for heavy metal removal, with low cost and high efficiency
A remo??o de microcontaminantes, em especial no tratamento de efluentes contendo metais pesados, ? um desafio na atualidade, em decorr?ncia de seu elevado custo e baixa efici?ncia. Uma tecnologia que vem surgindo como promissora ? a aplica??o de nanocomp?sitos biodegrad?veis, a qual apresenta uma efici?ncia favor?vel de remo??o e recupera??o deste microcontaminante, al?m de seu baixo custo. Neste ?mbito, o presente estudo objetivou desenvolver e caracterizar um nanocomp?sito ? base de hidroxiapatita (HAP), poliuretano (PU) e ?lcool povinil?co (PVA) para remo??o de metais pesados. A investiga??o foi desenvolvida em v?rias etapas: i)- caracteriza??o f?sico-qu?mica e microbiol?gica de efluentes hospitalares, como potencial caso de estudo; ii)- produ??o de hidroxiapatita por meio da t?cnica de precipita??o aquosa, e respectiva caracteriza??o; iii)- produ??o de nanocomp?sito com revestimento, no qual a hidroxiapatita (HAp) foi adicionada aos pr?-pol?meros de poliuretano, e a pel?cula de ?lcool poliv?nilico e hidroxiapatita foi produzida e aderida ao comp?sito; iv)- produ??o de comp?sito n?o-peliculado PU/HAp nas propor??es a 20 e 40% de HAp; v)- caracteriza??o do comp?sito pelas t?cnicas de DRX, FTIR, MEV/EDS, BET, Potencial Zeta e TGA; vi)- tratamento f?sico-qu?mico da fibra de sisal e coco, como potenciais bioadsorventes de baixo custo utilizados em estudos comparativos; vii)- testes de adsor??o de metais pesados (n?quel e c?dmio). Neste ?mbito, foi realizada uma triagem inicial de capacidade de adsor??o da HAp, PU/HAp 20 e 40% e PU/HAp/PVA, envolvendo estudos cin?ticos de adsor??o de Cd (II). De modo a identificar as vari?veis mais importantes na adsor??o de Cd (II) pelo comp?sito PU/HAp, foi tamb?m considerado o desenho de experi?ncias (factorial design). Adicionalmente, este adsorvente (PU/HAp) foi tamb?m testado como adsorvente de Cd e Ni. Finalmente, foram realizados testes de adsor??o de Cd em fibras de coco, e de Ni em fibras de sisal. O estudo realizado permitiu concluir que o comp?sito PU/HAp 40% apresentou elevada efici?ncia na remo??o de Cd (II) e Ni (II), superiores a 80%, sendo equivalente ?s fibras lignocelul?sicas utilizadas e ? HAp produzida. Como principal conclus?o deste estudo, destaca-se o fato de que estes materiais podem ser utilizados no tratamento de efluentes para remo??o de metais pesados, dado que apresentam baixo e custo e elevada efici?ncia
2020-01-01
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6

Souza, Sivoney Ferreira de [UNESP]. "Obtenção de nanofibras de curauá e aplicação como reforço em compósitos baseados em PVA." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/90547.

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
O momento atual de maior preocupação ambiental global, a crescente escassez dos recursos fósseis, bem como as novas regulagens ambientais força a busca por materiais que sejam renováveis e compatíveis com o ambiente. Novos materiais estão sendo desenvolvidos a partir de várias fontes naturais e, entre eles a celulose é o mais abundante dos polímeros naturais e um dos mais utilizados. Logo, o objetivo desta dissertação de mestrado foi obter nanofibras de celulose tendo como fonte a fibra vegetal de curauá. Os processos utilizados foram químicos e mecânicos, baseados nos processos de polpação e branqueamento, a fim de isolar a celulose, seguido de processos mecânicos para atingir a escala nanométrica. As nanofibras de celulose propiciam vantagens como melhoria nas propriedades mecânicas e de barreira, além de manter a transparência de polímeros em geral. A fim de comprovar a capacidade de reforço em matrizes poliméricas, as nanofibras de celulose obtidas foram incorporadas nas mesmas. No entanto, para evitar a tendência de aglomeração das nanofibras, principalmente quando retiradas do meio aquoso, o álcool polivinílico (pva) foi escolhido como a matriz polimérica a ser testada, devido à sua compatibilidade com nanofibras de celulose, por ambos serem de natureza hidrofílica, o que aumenta a compatibilidade interfacial de fases entre a nanocelulose e a matriz escolhida. Após a incorporação das nanofibras na matriz polimérica ocorreram significativas melhoras nas propriedades mecânicas da matriz. Ao incorporar 4% de nanofibras da celulose de curauá obteve-se um ganho de 36% e 67% para a tração e para o módulo de young, respectivamente. Com 5% de nanofibras, o aumento nas propriedades foram ainda mais significativos em torno de 44% para a tração máxima e 448% para o módulo de young
Nowadays is a era of greatest environmental concern, with growing scarcity of fossil resources, as well as new environmental regulations obligating the search for materials that are renewable and environmentally friendly. New materials are being developed from various natural sources, and among them, cellulose is the most abundant natural polymers and the one most used. Therefore, the purpose of this thesis was to obtain cellulose nanofibers fibers from curaua plant. The procedures used were based on chemical and mechanical treatment. Pulping and bleaching, in this sequence were done in order to isolate the cellulose, followed by mechanical processes to achieve the nanometer scale. The cellulose nanofibers provide advantages such as improvement of mechanical properties and barrier, besides maintaining transparency of polymers in general. To prove the capacity of reinforcement in polymer matrices, the cellulose nanofibers obtained were incorporated into them. However, to avoid the tendency of nanofibers agglomeration when removed from water, the polyvinyl alcohol (PVA) was chosen as the polymer matrix to be tested, for the reasons that both are hydrophilic in nature and compatible to cellulose nanofibers, which increases the interface between the matrix and the nanocelulose chosen. After the incorporation of nanofibers in the polymer matrix, a significant improvement were observed in its mechanical properties by incorporating 4% of cellulose nanofiber curauá which provided a gain of 36% and 67% for tension and Young's modulus, respectively. With 5% of nanofibers, the increase in properties was even more significant at around 44% for maximum tension and 448% for Young's modulus
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7

Souza, Sivoney Ferreira de 1982. "Obtenção de nanofibras de curauá e aplicação como reforço em compósitos baseados em PVA /." Botucatu : [s.n.], 2010. http://hdl.handle.net/11449/90547.

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Анотація:
Orientador: Alcides Lopes Leão
Banca: Elisabete Frollini
Banca: Pedro de Magalhães Padilha
Resumo: O momento atual de maior preocupação ambiental global, a crescente escassez dos recursos fósseis, bem como as novas regulagens ambientais força a busca por materiais que sejam renováveis e compatíveis com o ambiente. Novos materiais estão sendo desenvolvidos a partir de várias fontes naturais e, entre eles a celulose é o mais abundante dos polímeros naturais e um dos mais utilizados. Logo, o objetivo desta dissertação de mestrado foi obter nanofibras de celulose tendo como fonte a fibra vegetal de curauá. Os processos utilizados foram químicos e mecânicos, baseados nos processos de polpação e branqueamento, a fim de isolar a celulose, seguido de processos mecânicos para atingir a escala nanométrica. As nanofibras de celulose propiciam vantagens como melhoria nas propriedades mecânicas e de barreira, além de manter a transparência de polímeros em geral. A fim de comprovar a capacidade de reforço em matrizes poliméricas, as nanofibras de celulose obtidas foram incorporadas nas mesmas. No entanto, para evitar a tendência de aglomeração das nanofibras, principalmente quando retiradas do meio aquoso, o álcool polivinílico (pva) foi escolhido como a matriz polimérica a ser testada, devido à sua compatibilidade com nanofibras de celulose, por ambos serem de natureza hidrofílica, o que aumenta a compatibilidade interfacial de fases entre a nanocelulose e a matriz escolhida. Após a incorporação das nanofibras na matriz polimérica ocorreram significativas melhoras nas propriedades mecânicas da matriz. Ao incorporar 4% de nanofibras da celulose de curauá obteve-se um ganho de 36% e 67% para a tração e para o módulo de young, respectivamente. Com 5% de nanofibras, o aumento nas propriedades foram ainda mais significativos em torno de 44% para a tração máxima e 448% para o módulo de young
Abstract: Nowadays is a era of greatest environmental concern, with growing scarcity of fossil resources, as well as new environmental regulations obligating the search for materials that are renewable and environmentally friendly. New materials are being developed from various natural sources, and among them, cellulose is the most abundant natural polymers and the one most used. Therefore, the purpose of this thesis was to obtain cellulose nanofibers fibers from curaua plant. The procedures used were based on chemical and mechanical treatment. Pulping and bleaching, in this sequence were done in order to isolate the cellulose, followed by mechanical processes to achieve the nanometer scale. The cellulose nanofibers provide advantages such as improvement of mechanical properties and barrier, besides maintaining transparency of polymers in general. To prove the capacity of reinforcement in polymer matrices, the cellulose nanofibers obtained were incorporated into them. However, to avoid the tendency of nanofibers agglomeration when removed from water, the polyvinyl alcohol (PVA) was chosen as the polymer matrix to be tested, for the reasons that both are hydrophilic in nature and compatible to cellulose nanofibers, which increases the interface between the matrix and the nanocelulose chosen. After the incorporation of nanofibers in the polymer matrix, a significant improvement were observed in its mechanical properties by incorporating 4% of cellulose nanofiber curauá which provided a gain of 36% and 67% for tension and Young's modulus, respectively. With 5% of nanofibers, the increase in properties was even more significant at around 44% for maximum tension and 448% for Young's modulus
Mestre
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8

Rasselet, Damien. "Etude de nanocomposites basés sur des alliages PLA/PA11." Thesis, IMT Mines Alès, 2019. http://www.theses.fr/2019EMAL0001/document.

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L’acide polylactique (PLA) est l’un des polymères biosourcés qui suscite le plus d’intérêt, mais ses propriétés thermomécaniques nécessitent d’être améliorées. Pour ce faire, les méthodes les plus utilisées et étudiées sont de le mélanger avec d’autres polymères ou bien d’y ajouter des charges minérales nanométriques (nanoparticules), afin de constituer un nanocomposite à matrice PLA. C’est dans la combinaison de ces deux approches que s’inscrivent ces travaux de thèse, consacrés à l’élaboration et à la caractérisation des propriétés de nanocomposites à base d’un alliage de PLA et de polyamide 11 (PA11) 80/20 m/m. L’objectif de cette thèse est l’obtention d’un matériau biosourcé aux propriétés thermiques, mécaniques et de réaction au feu améliorées par le contrôle de sa morphologie et l’ajout de nanoparticules et de retardateurs de flamme (RF). Pour y parvenir, deux techniques de compatibilisation, destinées à améliorer l’adhésion interfaciale entre le PLA et le PA11, ont été évaluées. La première consistait à incorporer des nanoparticules de silice. Il a été noté d’importantes modifications de la morphologie et des propriétés rhéologiques du mélange d’étude, selon leur localisation dans le mélange étudié fonction de la nature chimique de la surface de la silice. La deuxième consistait à introduire un copolymère époxyde multifonctionnel réactif, dénommé Joncryl. La réactivité de ce copolymère avec le PLA et le PA11 a permis de compatibiliser le mélange d’étude, conduisant à une morphologie plus fine et à l’obtention de propriétés mécaniques supérieures à celles du mélange d’étude, en particulier avec l’ajout de 3%m de Joncryl. Des échantillons basés sur les mélanges compatibilisés par cette méthode ont été préparés par le procédé de fabrication additive FDM. Une étude de l’impact de ce procédé sur la morphologie et les propriétés mécaniques obtenues a été entreprise. Enfin, une meilleure réaction au feu pour le mélange compatibilisé avec 3%m de Joncryl a pu être obtenue par l’ajout combiné de nanoparticules de phyllosilicates et de RF
Polylactic acid (PLA) is one of the biobased polymers that generates the most interest, but its thermomechanical properties need to be improved. To do that, the most used and studied methods consist of blending PLA with other polymers or adding nanoscaled mineral fillers (nanoparticles) to get a PLA based nanocomposite. This PhD work is dedicated to the elaboration and properties characterization of nanocomposites based on a filled PLA and polyamide 11 80/20 wt/wt blend. The aim is to obtain a biobased material with improved thermal, mechanical and fire reaction properties by controlling its morphology through the addition of nanoparticles and flame retardants additives.To achieve that, two compatibilization techniques, aiming to improve PLA-PA11 interfacial adhesion, were evaluated. The first one consisted of adding silica nanoparticles. Important changes of the blend morphology and rheological properties were noticed, depending on the localization of the two different silica nanoparticles used into the polymer blend phases. The second one consisted of introducing a reactive multifunctional epoxy copolymer, named Joncryl. The reactivity of this copolymer with PLA and PA11 allowed to compatibilize the blend, leading to a fine morphology and higher mechanical properties compared to those of the pristine blend. Samples of compatibilized blends obtained through this method were processed using FDM additive manufacturing process. A study of the influence of this process on the morphology and mechanical properties obtained for these samples was performed. Finally, a better fire reaction of compatibilized polymer blend with 3%wt Joncryl was obtained by the combined addition of phyllosilicates nanoparticles and flame retardants
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9

Piao, Haiyuan. "Microbial-derived cellulose-reinforced biocomposites." Thesis, University of Canterbury. Mechanical Engineering, 2006. http://hdl.handle.net/10092/1139.

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The preparation and characterisation of novel nano-scale biodegradable biocomposite materials, consisting of bacterial cellulose (BC) in a poly(lactic acid) (PLA) matrix, are investigated. BC exhibits high purity, high mechanical strength and an ultra-fine fibrous 3D network structure, while PLA is low cost, biodegradable matrix material derived from natural resources. In this work, composites of BC reinforced PLA were prepared using a solution exchange process and compression molding. The microstructure of the raw materials and composites was characterised using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and atomic force microscopy (AFM). The thermal properties and crystallinity of PLA and composites were measured using differential scanning calorimetry (DSC). The mechanical properties of pure PLA and composite materials were evaluated using static and dynamic mechanical analysis (DMA). In order to improve the interfacial adhesion between the BC and PLA matrix, BC was acetylated (ABC) or treated with 3-aminopropyltriethoxysilane (APS) coupling agent (SBC). The PLA was plasticized with glycerol (PLAG) in order to increase its ductility. As compared to the Young's modulus of neat PLA (1.9 GPa), ABC generated the highest increase in Young's modulus (4.8 GPa) of the resulting composites followed by BC (4.6 GPa) and SBC (4.5 GPa). The tensile strength of PLA (31 MPa) also was enhanced to 75 MPa with BC, 72 MPa with SBC or 38 MPa with ABC. The ductility of PLAG was degraded with the addition of glycerol. A large amount voids led to a reduction in the mechanical properties of PLAG and PLAG based composites. Every reinforcement led to an improvement in the storage modulus (E') of the neat PLA and PLAG, especially at temperatures above the glass transition temperature (Tg). The DMA results showed that the presence of BC based reinforcements significantly reduced the damping properties of PLA. The reinforcements also influenced the crystalline procedure of PLA. With the addition of BC or ABC to the PLA matrix, the melting points of the composites were increased ~ 4-7 ℃ with a slight change on crystallinity; the crystallinity of SBC-PLA composite decreased from 31.9 % to 26.9 % with only a change of ~ 1 ℃ in the melting point.
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10

Ocwelwang, Atsile Rosy. "Photocatalytic activity and antibacterial properties of Ag/N-doped TiO2 nanoparticles on PVAE-CS nanofibre support." Thesis, University of Fort Hare, 2012. http://hdl.handle.net/10353/d1006794.

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Lack of potable water is one of the major challenges that the world faces currently and the effects of this are mainly experienced by people in developing countries. This has therefore propelled research in advanced oxidation technologies AOTs to improve the current water treatment methods using cost effective, non toxic and efficient treatment methods. Hence, in this study the sol-gel synthesis method was used to prepare TiO2 nanoparticles that were photocatalytically active under UV and visible solar light as well as possessing antibacterial properties. Silver and nitrogen doping was carried out to extend the optical absorption of TiO2. For easy removal and reuse of the photocatalyst the nanoparticles were immobilized on chitosan and poly (vinyl-alcohol-co-ethylene) using the electrospining technique. The synthesized nanomaterials were characterized by FTIR, XRD, SEM/EDS, TEM, DRS, and TGA. FTIR and EDS analysis confirmed the formation and composition of TiO2 nanopowders for the doped and undoped nanoparticles. XRD analysis showed that the anatase phase was the dominant crystalline phase of the synthesized nanopowders. SEM and TEM respectively illustrated the distribution and size of the electrospun nanofibers and the nanoparticles of TiO2. DRS results showed that there was a significant shift in the absorption band edge and wavelength of Ag-TiO2 to 397 nm, followed by N-TiO2 at 396 nm compared to the commercial titania which was at 359 nm. The photocatalytic activities and antibacterial properties of these materials were tested on methylene blue dye and E.coli microorganism respectively. Ag-TiO2 immobilized on nanofibers of chitosan and PVAE had the highest photocatalytic activity compared to N-TiO2. Similar results were observed when the biocide properties of these materials were tested on E. coli.
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Книги з теми "PVA Nanocomposite"

1

Roy, Ipsita, and Visakh P M, eds. Polyhydroxyalkanoate (PHA) based Blends, Composites and Nanocomposites. Cambridge: Royal Society of Chemistry, 2014. http://dx.doi.org/10.1039/9781782622314.

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Kim, J., J. Y. Chang, D. Y. Godovsky, M. J. Han, and C. M. Hassan. Biopolymers · PVA Hydrogels Anionic Polymerisation Nanocomposites. Springer, 2003.

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Biopolymers · PVA Hydrogels, Anionic Polymerisation Nanocomposites. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/3-540-46414-x.

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Lee, B., N. A. Peppas, J. Kim, J. Y. Chang, D. Y. Godovsky, M. J. Han, C. M. Hassan, Y. Lee, R. P. Quirk, and T. Yoo. Biopolymers - Pva Hydrogels Anionic Polymerisation Nanocomposites. Springer, 2013.

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(Contributor), J. Y. Chang, D. Y. Godovsky (Contributor), M. J. Han (Contributor), C. M. Hassan (Contributor), J. Kim (Contributor), B. Lee (Contributor), Y. Lee (Contributor), N. A. Peppas (Contributor), R. P. Quirk (Contributor), and T. Yoo (Contributor), eds. Biopolymers/PVA Hydrogels/Anionic Polymerisation/ Nanocomposites (Advances in Polymer Science). Springer, 2000.

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Polyhydroxyalkanoate (PHA) Based Blends, Composites and Nanocomposites. Royal Society of Chemistry, The, 2014.

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7

Lee, Yoon Hwan. Polyethylene/clay nanocomposite foams blown with physical blowing agents (PBA): From microcellular to nanocellular. 2004.

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Частини книг з теми "PVA Nanocomposite"

1

Vera Garcia, P. F., L. A. Guerrero Dimas, J. J. Cedillo Portillo, O. A. Martínez Anguiano, A. Sáenz Galindo, R. I. Narro Cespedes, P. Acuña Vazquez, and A. Castañeda Facio. "PVA Blends and Nanocomposites, Properties and Applications: A Review." In Green-Based Nanocomposite Materials and Applications, 191–206. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-18428-4_10.

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2

Godovsky, D. Y. "Device Applications of Polymer-Nanocomposites." In Biopolymers · PVA Hydrogels, Anionic Polymerisation Nanocomposites, 163–205. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/3-540-46414-x_4.

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Anwar, Hafeez, Muhammad Haseeb, Mariyam Khalid, and Kamila Yunas. "Graphene Reinforced PVA Nanocomposites and Their Applications." In Graphene Based Biopolymer Nanocomposites, 107–34. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-9180-8_6.

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4

Kobayashi, Hisatoshi. "PVA-HAp Nanocomposites for Artificial Cornea." In Advances in Science and Technology, 9–16. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908158-09-5.9.

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5

Kiran, Ifrah, Naveed Akhtar Shad, M. Munir Sajid, Yasir Jamil, Yasir Javed, M. Irfan Hussain, and Kanwal Akhtar. "Graphene Functionalized PLA Nanocomposites and Their Biomedical Applications." In Graphene Based Biopolymer Nanocomposites, 83–105. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-9180-8_5.

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6

Tehrani, Mahsa A., Abozar Akbari, and Mainak Majumder. "Polylactic Acid (PLA) Layered Silicate Nanocomposites." In Handbook of Polymernanocomposites. Processing, Performance and Application, 53–67. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-38649-7_5.

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7

Akbari, Abozar, Mainak Majumder, and A. Tehrani. "Polylactic Acid (PLA) Carbon Nanotube Nanocomposites." In Handbook of Polymer Nanocomposites. Processing, Performance and Application, 283–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-45229-1_45.

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8

Sharif, Ahmed, Sudipta Mondal, and Md Enamul Hoque. "Polylactic Acid (PLA)-Based Nanocomposites: Processing and Properties." In Bio-based Polymers and Nanocomposites, 233–54. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05825-8_11.

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9

Mohamed Saat, Asmalina, Syarmela Alaauldin, Md Salim Kamil, Fatin Zawani Zainal Azaim, and Mohd Rafie Johan. "The Optical Properties of Polyvinyl Alcohol (PVA), Phosphorylated Polyvinyl Alcohol (PPVA), and Phosphorylated Polyvinyl Alcohol—Aluminum Phosphate (PPVA-AlPO4) Nanocomposites: Effect of Phosphate Groups." In Advanced Structured Materials, 179–87. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-89988-2_13.

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Bello, Sefiu Adekunle, Stephen Idowu Durowaye, Winfred Emoshiogwe Aigbona, Babatunde Olumbe Bolasodun, Kemi Audu, and Soliu Oladejo Abdul Ganiyu. "279Parquetina nigrescens–Reinforced Polylactic Acid (PLA) Composites for Engineering Applications." In Hybrid Polymeric Nanocomposites from Agricultural Waste, 279–319. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003170549-15.

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Тези доповідей конференцій з теми "PVA Nanocomposite"

1

Mitra, Sreemanta, Dhriti Ranjan Saha, Sourish Banerjee, and Dipankar Chakravorty. "Viscoelastic properties of graphene/PVA nanocomposite." In PROCEEDING OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN APPLIED PHYSICS AND MATERIAL SCIENCE: RAM 2013. AIP, 2013. http://dx.doi.org/10.1063/1.4810111.

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2

Mahendia, Suman, A. K. Tomar, P. K. Goyal, Rajesh Kumar, and Shyam Kumar. "PVA-Ag nanocomposite: As glucose sensing material." In 2012 1st International Symposium on Physics and Technology of Sensors (ISPTS). IEEE, 2012. http://dx.doi.org/10.1109/ispts.2012.6260971.

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3

Kushwaha, Kamal Kumar, and Meera Ramrakhaini. "Optical studies of CdSe/PVA nanocomposite films." In 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5032434.

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4

Tyagi, Chetna, and Ambika Sharma. "Linear and nonlinear optical study of pure PVA and CdSe doped PVA nanocomposite." In INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2015): Proceeding of International Conference on Condensed Matter and Applied Physics. Author(s), 2016. http://dx.doi.org/10.1063/1.4946202.

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5

Caraman, I., S. Robu, P. Gaşin, I. Lazar, G. Lazar, and M. Stamate. "Photoluminescence properties of CdS/PVA nanocomposite thin films." In Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies IV, edited by Paul Schiopu, Cornel Panait, George Caruntu, and Adrian Manea. SPIE, 2009. http://dx.doi.org/10.1117/12.823654.

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6

Abdullah, Nor Hakimin, Nur Aiman Mohamad Senusi, Rathesh Kumaran Ulaganathan, Norshahidatul Akhmar Mohd Shohaimi, Zamani Ab Halim, Nurasmat Mohd Shukri, Mohamad Asyraf Mohd Amin, and Abrar Ismardi. "Preparation and characterization of PVA/CNC/CNT nanocomposite." In INTERNATIONAL CONFERENCE ON BIOENGINEERING AND TECHNOLOGY (IConBET2021). AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0078577.

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7

Coskun, T., and R. Asmatulu. "Enhancing the Storage Capacity of Supercapacitors Using PVA/CNT Nanocomposite Electrolytes." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-39794.

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Анотація:
The ability to achieve high surface areas with nanomaterials brought several advancements in energy storage devices and their applications in different industries. Supercapacitors, a new generation of energy storage devises, have quick charge and discharge abilities, and hold as much energy as batteries and other chemical storage devices. The present study focuses on the effects of carbon nanotubes (CNTs) inclusions in polyvinyl alcohol (PVA) electrolytes for the improved capacitance values, which may affect the lifetime, charge holding, and charging and discharging rates of the graphene nanoflake-based supercapacitors. In this research, various supercapacitors were constructed using the reduced graphene oxide nanoflakes, PVA and PVA incorporated with CNTs, and the best candidates were selected for the future considerations. The test results showed that the CNT concentrations of 0.1–1.0wt% in PVA enhanced the capacitance (charge holding capacity) and reduced the internal resistance of the electrolytes significantly. This study may open up new possibilities for the supercapacitors and other energy storage devices currently under developments.
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Xu, Buqin, Jin Yang, Guilong Xu, and Jian Hu. "Preparation and Properties of Na-MMT/PVA Nanocomposite Emulsion." In International Conference on Chemical,Material and Food Engineering. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/cmfe-15.2015.65.

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9

Viswanath, Varsha, C. Beenakumari, and C. I. Muneera. "ZnO-PVA nanocomposite films for low threshold optical limiting applications." In LIGHT AND ITS INTERACTIONS WITH MATTER. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4898305.

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10

Rao, M. C., S. K. Shahenoor Basha, and B. Ranjit Kumar. "Impedance analysis on PVA/PVP: GO blend nanocomposite polymer films." In 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5032939.

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