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Polymer nanocomposite

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https://www.readbyqxmd.com/read/30099269/enhanced-wound-healing-activity-of-peg-pcl-copolymer-combined-with-bioactive-nanoparticles-in-wound-care-after-anorectal-surgery-via-bio-inspired-methodology
#1
Fengli Wang, Yan Xu, Chunmei Lv, Chunling Han, Yan Li
Over the past decade, the implementation of the novel nanomaterials in the field of nanotechnology for the biomedical applications is essential for the comfort factors such as non-toxicity and biocompatibility in the human biological systems. In this context, a novel synthesis was worked out through bacterial species (citrobacter braakii) in the biofabrication of bioactive gold nanoparticles (Au NPs) for the wound healing management. The biosynthesized Au NPs were further modified and improved its compatibility with polyethylene glycol (PEG) and polycaprolactone (PCL) for formed as Au-PEG/PCL nanocomposites to extent the activity in wound healing application...
July 22, 2018: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/30094455/low-field-giant-magneto-ionic-response-in-polymer-based-nanocomposites
#2
Daniela M Correia, Pedro Martins, Mohammad Tariq, José M S S Esperança, Senentxu Lanceros-Méndez
The future of magnetoelectric (ME) materials is closely linked to the optimization of the ME response on nanocomposites or to the introduction of new effects to achieve higher ME performance from low magnetic fields. Here, we report a P(VDF-TrFE)/[C4mim][FeCl4] nanocomposite with a magneto-ionic response that produces giant magnetoelectric coefficients up to ≈10 V cm-1 Oe-1. This response comprises a magnetically triggered ionic/charge movement within the porous structure of the polymer, being this a novel phenomenon never experimentally observed or explored in magnetoelectric composites...
August 10, 2018: Nanoscale
https://www.readbyqxmd.com/read/30088763/achieving-high-energy-density-and-low-loss-in-pvdf-bst-nanodielectrics-with-enhanced-structural-homogeneity
#3
Yunchuan Xie, Wanrong Jiang, Tao Fu, Jingjing Liu, Zhicheng Zhang, Shengnan Wang
Poor compatibility of polymer/ceramic composites used as high-pulse capacitors with high permittivity suffers from the reduced breakdown strength (Eb) and lowered energy density (Ue). Herein, mussels-inspired poly(dopamine) (PDA) modified BaSrTiO3 nanoparticle (mBST) and PVDF matrix are bonded together to fabricate nanocomposites with crosslinked 3D network and enhanced compatibility. The significantly improved Eb of 466 MV/m and the highest Ue of 11.0 J/cm3 for PVDF-based polymer/BST composites have been obtained...
August 8, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30085403/carbon-nanotube-reinforced-supramolecular-hydrogels-for-bioapplications
#4
Marko Mihajlovic, Milos Mihajlovic, Patricia Y W Dankers, Rosalinde Masereeuw, Rint P Sijbesma
Nanocomposite hydrogels based on carbon nanotubes (CNTs) are known to possess remarkable stiffness, electrical, and thermal conductivity. However, they often make use of CNTs as fillers in covalently cross-linked hydrogel networks or involve direct cross-linking between CNTs and polymer chains, limiting processability properties. Herein, nanocomposite hydrogels are developed, in which CNTs are fillers in a physically cross-linked hydrogel. Supramolecular nanocomposites are prepared at various CNT concentrations, ranging from 0...
August 7, 2018: Macromolecular Bioscience
https://www.readbyqxmd.com/read/30082252/synthesis-of-poly-acrylamide-co-itaconic-acid-mwcnts-superabsorbent-hydrogel-nanocomposite-by-ultrasound-assisted-technique-swelling-behavior-and-pb-ii-adsorption-capacity
#5
Alireza Mohammadinezhad, Gholam Bagheri Marandi, Majid Farsadrooh, Hamedreza Javadian
In this research, the poly (acrylamide-co-itaconic acid)/multi-walled carbon nanotubes (P(AAm-co-IA)/MWCNTs) as a novel superabsorbent hydrogel nanocomposite was synthesized by graft copolymerization of acrylamide (AAm) and itaconic acid (IA) mixture in the presence of the MWCNTs using ammonium persulfate (APS) as a free radical initiator and methylenebisacrylamide (MBA) as a crosslinker under ultrasound-assisted condition. The blank P(AAm-co-IA) hydrogel and its composite with the MWCNTs were characterized by means of SEM, FTIR, XRD and TGA methods...
December 16, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30081308/new-polymer-matrix-nanocomposites-based-on-swcnts-and-pvk-ppv-copolymer-synthesis-functionalization-and-characterization
#6
M Mbarek, F Abbassi, K Alimi
An original nanocomposite material was prepared by in-situ grafting of a PVK-PPV copolymer onto SWCNTs. The new composites were elaborated with various SWCNTs weight concentrations into homemade PVK-PPV copolymer. Different experimental analyses were performed to investigate their morphological features and their optical and vibrational spectroscopy behaviors as a function of the concentration of carbon nanotubes. Π-staking and covalent interactions and functionalization process between copolymer and SWCNT undergo dramatic effect in vibrational and photoemissives properties of copolymer matrix...
July 22, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/30081102/carbon-nanofiber-amalgamated-3d-poly-%C3%AE%C2%B5-caprolactone-scaffold-functionalized-porous-nanoarchitectures-for-human-meniscal-tissue-engineering-in-vitro-and-in-vivo-biocompatibility-studies
#7
J Gopinathan, Mamatha M Pillai, S Shanthakumari, S Gnanapoongothai, B K Dinakar Rai, K Santosh Sahanand, R Selvakumar, Amitava Bhattacharyya
We developed customizable biomolecule functionalized 3D poly-ε-caprolactone (PCL) scaffolds reinforced with carbon nanofibers (CNF) for human meniscal tissue engineering. 3D nanocomposite scaffolds exhibited commendable mechanical integrity and electrical properties with augmented cytocompatibility. Especially, the functionalized 3D (10wt% CNF) scaffolds showed ~363% increase in compressive moduli compared to the pristine PCL. In dynamic mechanical analysis, these scaffolds achieved highest value (~42MPa at 10Hz) among all tested scaffolds including pristine PCL and human menisci (33, 41, 56 years)...
August 3, 2018: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/30075905/effects-of-the-addition-of-mwcnt-and-zro-2-nanoparticles-on-the-dosimetric-properties-of-pvdf
#8
Esther Lorrayne Machado Pereira, Adriana de Souza Medeiros Batista, Neriene Alves, Arno Heeren de Oliveira, Fabiola A S Ribeiro, Adelina P Santos, Luiz Oliveira de Faria
The industrial application of radiation processing involves high doses of gamma or electron radiation to cause structural changes in materials, such as rubber vulcanization and polymer degradation, among others. A reliable dosimetric system is necessary to guarantee the desired effects and also to avoid damages. Poly(vinylidene fluoride) [PVDF] homopolymer has been recently proposed for application in high gamma dose dosimetry. In this work, nanocomposites made of PVDF filled with zirconium oxide [ZrO2 ] nanoparticles and multiwalled carbon nanotubes [MWCNT] were studied for applications in high dose dosimetry, for doses ranging from 100...
July 11, 2018: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/30074761/using-unentangled-oligomers-to-toughen-materials
#9
Scott G Isaacson, Yusuke Matsuda, Krystelle Lionti, Theo Frot, Willi Volksen, Reinhold H Dauskardt, Geraud Jean-Michel Dubois
Entanglements between polymer chains are responsible for the strength and toughness of polymeric materials. When the chains are too short to form entanglements, the polymer becomes weak and brittle. Here we show that molecular bridging of oligomers in molecular-scale confinement can dramatically toughen materials even when inter-molecular entanglements are completely absent. We describe the fabrication of nanocomposite materials that confine oligomer chains to molecular-scale dimensions, and demonstrate that confined unentangled oligomers can toughen materials far beyond rule-of-mixtures estimates...
August 3, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30073736/theoretical-model-of-time-temperature-superposition-principle-of-the-self-healing-kinetics-of-supramolecular-polymer-nanocomposites
#10
Zijian Zheng, Xiuyang Xia, Xianxiang Zeng, Xiu Li, Youping Wu, Jun Liu, Liqun Zhang
The matrix-free polymer nanocomposites (PNCs) formed by polymer-grafted nanoparticles(NPs) gain enormous attention due to their controllable morphology and robust properties. Herein, through molecular dynamics simulation, such PNCs are successfully constructed, and the dispersion state of the NPs can be tailored by varying the grafting density. By manipulating the interaction strength between the end groups of the grafted polymer chains, the tensile fracture behavior and the chain orientation are examined. It is revealed that both of them fall down at large strain because of the propagation of the cavities...
August 3, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30057612/recent-progress-of-imprinted-nanomaterials-in-analytical-chemistry
#11
REVIEW
Rüstem Keçili, Chaudhery Mustansar Hussain
Molecularly imprinted polymers (MIPs) are a type of tailor-made materials that have ability to selectively recognize the target compound/s. MIPs have gained significant research interest in solid-phase extraction, catalysis, and sensor applications due to their unique properties such as low cost, robustness, and high selectivity. In addition, MIPs can be prepared as composite nanomaterials using nanoparticles, multiwalled carbon nanotubes (MWCNTs), nanorods, quantum dots (QDs), graphene, and clays. This review paper aims to demonstrate and highlight the recent progress of the applications of imprinted nanocomposite materials in analytical chemistry...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/30056705/computational-design-of-functionalized-substrate-for-capturing-nanoparticles-with-specific-size-and-shape
#12
Lin Shen, Hong-Ming Ding, Yu-Qiang Ma
The efficient capture of nanoscopic particulates plays a key role in many scientific fields like filtration, fabrication of nanocomposites as well as biosensors. In this work, we design two types of nanosubstrates to capture the nanoparticle with specific property by using Brownian dynamics simulations. It is found that the substrate coated with copolymers (composed of non-specific block and specific block) can be used to capture the nanoparticle with different sizes, but its capture efficiency of nanoparticles with different shapes is very low...
July 30, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/30052244/three-dimensional-graphene-based-polymer-nanocomposites-preparation-properties-and-applications
#13
REVIEW
Li-Zhi Guan, Li Zhao, Yan-Jun Wan, Long-Cheng Tang
Motivated by the unique structure and outstanding properties of graphene, three-dimensional (3D) graphene-based polymer nanocomposites (3D-GPNCs) are considered as new generation materials for various multi-functional applications. This review presents an overview of the preparation, properties and applications of 3D-GPNCs. Three main approaches for fabricating 3D-GPNCs, namely 3D graphene based template, polymer particle/foam template, and organic molecule cross-linked graphene, are introduced. A thorough investigation and comparison of the mechanical, electrical and thermal properties of 3D-GPNCs are performed and discussed to understand their structure-property relationship...
July 27, 2018: Nanoscale
https://www.readbyqxmd.com/read/30052027/high-strength-conductive-polyamide-6-nanocomposites-reinforced-by-prebuilt-three-dimensional-carbon-nanotube-networks
#14
Youdan Zheng, Rui Wang, Xiangyu Dong, Lixin Wu, Xu Zhang
The rapidly growing fields of aerospace, energy and electronic devices raise the demand for materials with ever-increasing mechanical properties, electrical and thermal conductivity. However, the combination of unusually high performance is difficult to attain. In this study, using pre-built three-dimensional (3D) closely packed interconnected multi-walled carbon nanotubes (MWNTs) networks as backbone for assembly of polymer matrix, a novel, green (solvent-free) and energy-saving method to prepare robust, highly electrically and thermally conductive polyamide nanocomposites is reported...
July 27, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30048588/high-performance-photopolymerized-poly-vinyl-alcohol-silica-nanocomposite-hydrogels-with-enhanced-cell-adhesion
#15
Can Zhang, Kaili Liang, Ding Zhou, Hongjun Yang, Xin Liu, Xianze Yin, Weilin Xu, Yingshan Zhou, Pu Xiao
Poly (vinyl alcohol) (PVA) hydrogels have been considered as promising implants for various soft tissue engineering applications due to their tissue-like viscoelasticity and biocompatibility. However, two critical barriers including lack of sufficient mechanical properties and non-tissue-adhesive characterization limit their application as tissue substitutes. Herein, PVA is methacrylated with ultralow degrees of substitution of methacryloyl groups to produce PVA-GMA. Subsequently, the PVA-GMA/methacrylate-functionalized silica nanoparticles (MSi) based nanocomposite hydrogels are developed via the photopolymerization approach...
July 26, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30047261/nano-structural-effects-in-high-cellulose-content-thermoplastic-nanocomposites-with-covalently-grafted-cellulose-pmma-interface
#16
Assya Boujemaoui, Farhan Ansari, Lars A Berglund
A critical aspect in materials design of polymer nanocomposites is the nature of the nanoparticle/polymer interface. The present study investigates the effect of manipulation of the interface between cellulose nanofibrils (CNF) and poly(methyl methacrylate) (PMMA) on the optical, thermal and mechanical properties of the corresponding nanocomposites. The CNF/PMMA interface is altered with a minimum of changes in material composition, so that interface effects can be analyzed. The hydroxyl-rich surface of CNF fibrils is exploited to modify the CNF surface, via an epoxide-hydroxyl reaction...
July 26, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/30046919/halloysite-nanotubes-in-analytical-sciences-and-in-drug-delivery-a-review
#17
REVIEW
Meriem Fizir, Pierre Dramou, Nasiru Sintali Dahiru, Wang Ruya, Tao Huang, Hua He
Halloysite (HNT) is a natural inorganic mineral that has many applications in manufacturing. This review (with 192 references) covers (a) the chemical properties of halloysites, (b) the effects of alkali and acid etching on the loading capacity and the release behavior of halloysites, (c) the use of halloysite nanotubes in analytical sciences and drug delivery, and (d) recent trends in the preparation of magnetic HNTs. Synthetic methods such as co-precipitation, thermal decomposition, and solvothermal method are discussed, with emphasis on optimal magnetization...
July 25, 2018: Mikrochimica Acta
https://www.readbyqxmd.com/read/30046158/facile-environmentally-benign-and-scalable-approach-to-produce-pristine-few-layers-graphene-suitable-for-preparing-biocompatible-polymer-nanocomposites
#18
Gejo George, Suja Bhargavan Sisupal, Teenu Tomy, Alaganandam Kumaran, Prabha Vadivelu, Vemparthan Suvekbala, Swaminathan Sivaram, Lakshminarayanan Ragupathy
The success of developing graphene based biomaterials depends on its ease of synthesis, use of environmentally benign methods and low toxicity of the chemicals involved as well as biocompatibility of the final products/devices. We report, herein, a simple, scalable and safe method to produce defect free few layers graphene using naturally available phenolics i.e. curcumin/tetrahydrocurcumin/quercetin, as solid-phase exfoliating agents with a productivity of ∼45 g/batch (D/G ≤ 0.54 and D/D' ≤ 1...
July 25, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30043803/transient-and-flexible-polymer-memristors-utilizing-full-solution-processed-polymer-nanocomposites
#19
Zhe Zhou, Huiwu Mao, Xiangjing Wang, Tao Sun, Qing Chang, Yingying Chen, Fei Xiu, Zhengdong Liu, Juqing Liu, Wei Huang
Building transient and flexible memristors is a promising strategy for developing emerging memory technologies. Here, a transient and flexible memristor based on a polymer nanocomposite, with a configuration of silver nanowire (AgNW)/citric acid quantum dot (CA QD)-polyvinyl pyrrolidone (PVP)/AgNW, is fabricated using a full-solution process method. The obtained device exhibits reversible resistive switching behavior and a dynamic random access memory (DRAM) storage feature, with the significant merits of a high ON/OFF ratio, low switching voltage, excellent reproducibility and desirable high flexibility, indicating outstanding memory characteristics such as low misreading, low power operation and low cost potential...
August 9, 2018: Nanoscale
https://www.readbyqxmd.com/read/30039965/radio-frequency-heating-of-carbon-nanotube-composite-materials
#20
Charles B Sweeney, Aaron G Moran, Jacob T Gruener, Alex M Strasser, Martin J Pospisil, Mohammad A Saed, Micah J Green
Here, we give the first-ever report of radio frequency (RF) electromagnetic heating of polymer nanocomposite materials via direct-contact and capacitively coupled electric field applicators. Notably, RF heating allows nanocomposite materials to be resistively heated with electric fields. We highlight our novel RF heating technique for multiwalled carbon nanotube (MWCNT) thermoplastic composites and measure their broadband dielectric properties. We also demonstrate three different electric field applicator configurations and discuss their practical use in an industrial setting...
August 2, 2018: ACS Applied Materials & Interfaces
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