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Polymer nanocomposite

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https://www.readbyqxmd.com/read/30546990/ternary-nanocomposites-of-reduced-graphene-oxide-polyaniline-and-hexaniobate-hierarchical-architecture-and-high-polaron-formation
#1
Claudio H B Silva, Maria Iliut, Christopher Muryn, Christian Berger, Zachary Coldrick, Vera R L Constantino, Marcia L A Temperini, Aravind Vijayaraghavan
Nanostructured systems, such as nanocomposites, are potential materials for usage in different fields since synergistic effects of their components at the nanoscale domain may improve physical/chemical properties when compared to individual phases. We report here the preparation and characterisation of a new nanocomposite composed of polyaniline (PANI), reduced graphene oxide (rGO) and hexaniobate (hexNb) nanoscrolls. Atomic force microscopy images show an interesting architecture of rGO flakes coated with PANI and decorated by hexNb...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30544584/studies-on-the-curing-efficiency-and-mechanical-properties-of-bis-gma-and-tegdma-nanocomposites-containing-silver-nanoparticles
#2
Izabela Barszczewska-Rybarek, Grzegorz Chladek
Bioactive dimethacrylate composites filled with silver nanoparticles (AgNP) might be used in medical applications, such as dental restorations and bone cements. The composition of bisphenol A glycerolate dimethacrylate (Bis-GMA) and triethylene glycol dimethacrylate (TEGDMA) mixed in a 60/40 wt% ratio was filled from 25 to 5000 ppm of AgNP. An exponential increase in resin viscosity was observed with an increase in AgNP concentration. Curing was performed by way of photopolymerization, room temperature polymerization, and thermal polymerization...
December 7, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/30542562/anion-exchange-in-inorganic-perovskite-nanocrystal-polymer-composites
#3
Maria Sygletou, Maria-Eleni Kyriazi, Antonios G Kanaras, Emmanuel Stratakis
We demonstrate a facile, low-cost and room-temperature method of anion exchange in cesium lead bromide nanocrystals (CsPbBr3 NCs), embedded into a polymer matrix. The anion exchange occurs upon exposure of the solid CsPbBr3 NCs/PDMS nanocomposite to a controlled anion precursor gas atmosphere. The rate and extent of the anion exchange reaction can be controlled via the variation of either the exposure time or the relative concentration of the anion precursor gas. Post-synthesis chemical transformation of perovskite nanocrystal-polymer composites is not readily achievable using conventional methods of anion exchange, which renders the gas-assisted strategy extremely useful...
November 14, 2018: Chemical Science
https://www.readbyqxmd.com/read/30537501/sol-gel-synthesis-of-hybrid-chitosan-calcium-aluminosilicate-nanocomposite-membranes-and-its-application-as-support-for-co-2-sensor
#4
Ali B Abou Hammad, Amany M Elnahrawy, Ahmed M Youssef
Modification of chitosan with cross-linkers, blends with various kinds of polymers, nanoparticles and new organic-inorganic hybrid composites in order to obtain some improved properties attached more attention nowadays due to their good sensitivity in changing electrical and optical properties. In the current work modified hybrid chitosan/calcium aluminosilicate (CH/CAS) nanocomposite membranes and doped with (3, 5 & 7 mol%) Al2 O3 nanoparticles were synthesized via sol-gel process in acidic conditions, which can be efficiently employed to capture CO2 gas at lower and moderate temperatures...
December 8, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/30537017/interfacial-coupling-boosts-giant-electrocaloric-effects-in-relaxor-polymer-nanocomposites-in-situ-characterization-and-phase-field-simulation
#5
Jianfeng Qian, Renci Peng, Zhonghui Shen, Jianyong Jiang, Fei Xue, Tiannan Yang, Longqing Chen, Yang Shen
The electrocaloric effect (ECE) refers to reversible thermal changes of a polarizable material upon the application or removal of electric fields. Without a compressor or cooling agents, all-solid-state electrocaloric (EC) refrigeration systems are environmentally benign, highly compact, and of very high energy efficiency. Relaxor ferroelectric ceramics and polymers are promising candidates as EC materials. Here, synergistic efforts are made by composing relaxor Ba(Zr0.21 Ti0.79 )O3 nanofibers with P(VDF-TrFE-CFE) to make relaxor-relaxor-type polymer nanocomposites...
December 9, 2018: Advanced Materials
https://www.readbyqxmd.com/read/30536997/dielectric-and-resistive-heating-of-polymeric-media-toward-remote-thermal-activation-of-stimuli-responsive-soft-materials
#6
Daniel P Armstrong, Richard J Spontak
Stimuli-responsive soft materials are becoming increasingly important in a wide range of contemporary technologies, and methods by which to promote thermal stimulation remotely are of considerable interest for controllable device deployment, particularly in inaccessible environments such as outer space. Until now, remote thermal stimulation of responsive polymers has relied extensively on the use of nanocomposites wherein embedded nanoparticles/structures are selectively targeted for heating purposes. In this study, an alternative remote-heating mechanism demonstrates that the dielectric and resistive thermal losses introduced upon application of an alternating current generate sufficient heat to raise the temperature of a neat polyimide by over 70 °C within ≈10 s...
December 11, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30525657/monte-carlo-simulation-modeling-of-nanoparticle-polymer-co-suspensions
#7
Michelle Gervasio, Kathy Lu
Creation of high quality and novel polymer-particle nanocomposites to a large extent depends on understanding the behaviors of individual polymer chains and particles, especially at the mixing state in a liquid solvent. Simulations can help identify critical parameters and equations that govern the suspension behaviors. This study is the first attempt to understand the agglomeration processes of ZnO nanoparticle and PMMA polymer co-suspensions through a constant number Monte Carlo simulation. A modified DLVO theory is used to describe the particle-particle interactions that lead to agglomeration...
December 11, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/30524022/high-temperature-transparent-superhydrophobic-teflon-af-2400-indium-tin-oxide-nanocomposite-thin-films
#8
Raad A Alawajji, Ganesh Kumara Kannarpady, Zeid A Nima, Nigel Kelly, Fumiya Watanabe, Alexandru Sorin Biris
The outstanding properties of Teflon AF-2400-chemical, optical, etc.-inspired us to make modifications to enhance its hydrophobicity. The AF-2400/Indium Tin Oxide Nanoparticles Nanocomposite was prepared by a spin coating technique at room temperature, using the AF-2400 polymer as the matrix and indium tin oxide (ITO) nanoparticles as the filler. Different ITONs concentrations ranging from 3 mg/ml to 30 mg/ml were prepared to study the effect of nanoparticle loading on the films' properties and superhydrophobicity...
November 20, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30523988/carbon-based-polymer-nanocomposites-as-dielectric-energy-storage-materials
#9
Mohammed H Al-Saleh
Nanostructured polymeric materials based on conductive nanofillers have promising applications in the energy storage field owing to the extraordinary characteristics of the nanofillers. Conductive nanofillers, such as graphene nanoplatelets, are characterized by small size, extraordinary surface area to volume ratio, high aspect-ratio and extremely low electrical resistivity. In this work, the dielectric behaviors and the corresponding energy storage capabilities of high aspect-ratio carbon nanofiller/polymer composites were reviewed...
December 7, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30523926/experimental-and-analytical-studies-on-the-flexible-low-voltage-electrothermal-film-based-on-the-multi-walled-carbon-nanotube-polymer-nanocomposite
#10
Fangxin Wang, Kai Zhang, Wenyan Liang, Zhenqing Wang, Bin Yang
This paper presents multi-walled carbon nanotube (MWCNT)/poly(m-phenylene isophthalamide) (PMIA) nanocomposite films as electrothermal elements, which offer advantages in flexibility, low energy consumption and rapid temperature growth. The electrical properties, electrothermal behavior and thermal stability of the films were investigated as a function of MWCNT content. The percolation behavior analysis revealed MWCNTs built a continuously conductive network in PMIA matrix at the corresponding percolation threshold of ~0...
November 16, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30523855/photocatalytic-and-antibacterial-activities-of-silver-and-iron-doped-titania-nanoparticles-in-solution-and-polyaspartic-coatings
#11
Paul A Charpentier, Chao Chen, Koosha Azhie, Bernd Grohe, Md Abdul Mumin, Adria F Lotus, Patrick Therrien, Silvia Mittler
Visible region active photocatalytic coatings are of interest for antimicrobial activity in low light applications or those employing LED lights with limited UV content. This work examined Ag and Fe doped titania nanoparticles (nTiO2) with varying dopant ranges in polyaspartic polymer coatings for potential light and dark activity. First, the Ag and Fe doped nTiO2 were synthesized by sol-gel chemistry with varying dopant concentrations, then characterized with respect to their size and aggregate size distribution, crystallinity, and surface and band gap features...
November 30, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30515984/a-superior-method-for-constructing-electrical-percolation-network-of-nanocomposite-fibers-in-situ-thermally-reduced-silver-nanoparticles
#12
C Muhammed Ajmal, Seonghyun Bae, Seunghyun Baik
Nanocomposite fibers, composed of conductive nanoparticles and polymer matrix, are crucial for wearable electronics. However, the nanoparticle mixing approach results in aggregation and dispersion problems. A revolutionary synthesis method by premixing silver precursor ions (silver ammonium acetate) with polyvinyl alcohol is reported here. The solvation of ions-prevented aggregation, and uniformly distributed silver nanoparticles (in situ AgNPs, 77 nm) are formed after thermal reduction (155 °C) without using additional reducing or dispersion agents...
December 4, 2018: Small
https://www.readbyqxmd.com/read/30514859/green-preparation-and-characterization-of-graphene-oxide-carbon-nanotubes-loaded-carboxymethyl-cellulose-nanocomposites
#13
Yeong-Rae Son, Soo-Jin Park
In this study, a homogeneous and stable dispersion of graphene oxide (GO)/carbon nanotube (CNT) complexes (GCCs) was obtained by dispersing CNTs in an aqueous solution using GO in the absence of dispersing agents. Furthermore, carboxymethyl cellulose/GCC (CMC/GCC) nanocomposite films were prepared by a simple solution mixing-evaporation method. The dispersibility of the GCCs with different CNT contents was investigated by UV-Vis spectrophotometry. The morphological and crystalline structures of the samples were analyzed by transmission electron microscopy, scanning electron microscopy, and X-ray diffraction...
December 4, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30511464/photoacoustic-and-fluorescent-effects-in-multilayer-plasmon-dye-interfaces
#14
Marina V Novoselova, Daniil N Bratashov, Mustafa Sarimollaoglu, Dmitry A Nedosekin, Walter Harringston, J Alex Watts, Mikyung Han, Boris N Khlebtsov, Ekaterina I Galanzha, Dmitry A Gorin, Vladimir P Zharov
Progress in understanding the cell biology and progression of disease depends on advanced imaging and labeling techniques. Here, we address this demand by exploring novel multilayered nanocomposites (MNCs) with plasmonic nanoparticles and adsorbing dyes in thin nonabsorbing shells as supercontrast multimodal photoacoustic (PA) and fluorescent agents in the near-infrared range. The proof of concept was performed with gold nanorods (GNRs) and indocyanine green (ICG) dispersed in a matrix of biodegradable polymers...
December 3, 2018: Journal of Biophotonics
https://www.readbyqxmd.com/read/30502426/using-photo-modification-to-compatibilize-nano-zno-in-development-of-starch-kefiran-zno-green-nanocomposite-as-food-packaging-material
#15
Iman Shahabi-Ghahfarrokhi, Amin Babaei-Ghazvini
In this study, the effect of UV-C light on starch-kefiran-ZnO (1%) primary solution in different exposure times (1, 6, and 12 h) was investigated. Starch-kefiran-ZnO (SKZ) solution was modified by UV irradiation in different time periods. Also, nano-ZnO (ZN) was used as a photo-initiator and reinforcement agent, simultaneously. Mechanical properties of the films were affected after the UV treatment. The tensile strength increased because of the enhanced interaction between the biopolymer mixture and nano filler but elongation at break was decreased...
November 28, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/30501808/toxicity-of-the-zinc-oxide-and-vermiculite-zinc-oxide-nanomaterials
#16
Karla Čech Barabaszová, Hana Rajhelová, Julie Smijová, Marianna Hundáková
Nanomaterials and nanocomposite materials on the base of zinc oxide (ZnO) are being produced and applied in our daily life at a rapid pace mainly as additives to the different polymer materials. The antibacterial behaviors of ZnO nanoparticles are intensively studied but related health and environmental toxicity assessments are lagging behind. The aim of this work was evaluated the toxic effect of self-synthesized samples (ZnO nanoparticles, vermiculite/ZnO nanocomposite) and one commercial sample of the ZnO nanoparticles, to induce oxidative stress via lipid peroxidation...
May 1, 2019: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/30501801/synthesis-and-antimicrobial-activity-of-polyethylene-chlorhexidine-vermiculite-nanocomposites
#17
Sylva Holešová, Magda Reli, Marianna Hundáková, Karla Čech Barabaszová, Michal Ritz, Eva Plevová, Erich Pazdziora
The set of polyethylene/clay nanocomposites with increasing amount of antimicrobial nanofiller (3, 6 and 10 wt%) was prepared by melt compounding procedure. The antimicrobial drug chlorhexidine diacetate was loaded into natural clay mineral vermiculite and also to its monoionic sodium form and then these organoclay nanofillers were incorporated into polymeric matrix. The structure of prepared organoclays and nanocomposites was studied by X-ray diffraction analysis and Fourier transforms infrared spectroscopy...
May 1, 2019: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/30501786/stevensite-rich-moroccan-clay-intercalated-by-polypyrrole-towards-the-enhancement-of-electrical-conductivity
#18
Jonáš Tokarský, Petra Vilímová, Pavlína Peikertová, Katečrina Mamulová Kutláková, Lenka Kulhánková
Regularly arranged chains strongly affect the electrical conductivity of conductive polymers (e.g., polypyrrole). One of the easiest ways to achieve this arrangement is the insertion of the polymer into the interlayer space of solid inorganic layered matrix, i.e., the intercalation process. Among various kinds of layered materials, the clay minerals, especially the smectite group, deserves particular attention. Negative charge of smectite layers helps the intercalation process resulting in higher conductivity of the polymer in clay/polymer intercalates...
May 1, 2019: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/30501779/characterization-of-montmorillonites-by-infrared-and-raman-spectroscopy-for-preparation-of-polymer-clay-nanocomposites
#19
Lenka Vaculíková, Eva Plevová, Michal Ritz
The detailed structural chemistry of clay minerals is an important aspect of polymer-clay nanocomposite research. A variety of analytical methods are currently available for material characterization. Keep in mind, however, that each method has some limitations. The best results are usually achieved by a combination of several analytical methods. The contribution demonstrates the potential and applicability of infrared and Raman spectroscopy in identification and structural characterization of montmorillonites...
May 1, 2019: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/30501759/synthesis-of-biogenic-copper-nanoparticles-embedded-in-graphene-oxide-chitosan-composite-and-its-anti-bacterial-and-cytotoxic-activities
#20
Subramanian Mugesh, Renganathan Arun, Kulanthaiyesu Arunkumar, Marudhamuthu Murugan
In the current scenario, nanoparticle synthesis has been fascinated by biogenic approaches than the chemical methods. However, reproducibility of the source stands essentially in nanoparticle synthesis. Nanoparticle synthesis by fungi has more advantages such as the potential for bioaccumulation, immunity towards toxicity, relatively easier to handle, simpler in synthesis and downstream processing. In this study, biogenic copper nanoparticles (CuNPs) were embedded within graphene oxide-chitosan (GO-CS) polymer to endure the biocompatibility and toxicological effects on both normal and cancer cells...
May 1, 2019: Journal of Nanoscience and Nanotechnology
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