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https://www.readbyqxmd.com/read/27925711/evaluation-of-susceptibility-of-polymer-and-rubber-materials-intended-into-contact-with-drinking-water-on-biofilm-formation
#1
Maciej Szczotko, Agnieszka Stankiewicz, Małgorzata Jamsheer-Bratkowska
Background: Plumbing materials in water distribution networks and indoor installations are constantly evolving. The application of new, more economical solutions with plastic materials eliminates the corrosion problems, however, do not fully protect the consumer against secondary microbial contamination of water intended for human consumption caused by the presence of a biofilm on the inner surface of materials applied. National Institute of Public Health - National Institute of Hygiene conducts research aimed at a comprehensive assessment of this type of materials, resulting their further marketing authorization in Poland...
2016: Roczniki Państwowego Zakładu Higieny
https://www.readbyqxmd.com/read/27925258/ohmic-heating-of-an-electrically-conductive-food-package
#2
Kanyawee Kanogchaipramot, Kullanart Tongkhao, Tanaboon Sajjaanantakul, Pitiya Kamonpatana
Ohmic heating through an electrically conductive food package is a new approach to heat the food and its package as a whole after packing to avoid post-process contamination and to serve consumer needs for convenience. This process has been successfully completed using polymer film integrated with an electrically conductive film to form a conductive package. Orange juice packed in the conductive package surrounded with a conductive medium was pasteurized in an ohmic heater. A mathematical model was developed to simulate the temperature distribution within the package and its surroundings...
December 2016: Journal of Food Science
https://www.readbyqxmd.com/read/27924913/thermal-alternating-polymer-nanocomposite-tapnc-coating-designed-to-prevent-aerodynamic-insect-fouling
#3
Ilker S Bayer, K Ghokulla Krishnan, Robert Robison, Eric Loth, Douglas H Berry, Thomas E Farrell, Jeffrey D Crouch
Insect residue adhesion to moving surfaces such as turbine blades and aircraft not only causes surface contamination problems but also increases drag on these surfaces. Insect fouling during takeoff, climb and landing can result in increased drag and fuel consumption for aircraft with laminar-flow surfaces. Hence, certain topographical and chemical features of non-wettable surfaces need to be designed properly for preventing insect residue accumulation on surfaces. In this work, we developed a superhydrophobic coating that is able to maintain negligible levels of insect residue after 100 high speed (50 m/s) insect impact events produced in a wind tunnel...
December 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27918568/solution-based-electrical-doping-of-semiconducting-polymer-films-over-a-limited-depth
#4
Vladimir A Kolesov, Canek Fuentes-Hernandez, Wen-Fang Chou, Naoya Aizawa, Felipe A Larrain, Ming Wang, Alberto Perrotta, Sangmoo Choi, Samuel Graham, Guillermo C Bazan, Thuc-Quyen Nguyen, Seth R Marder, Bernard Kippelen
Solution-based electrical doping protocols may allow more versatility in the design of organic electronic devices; yet, controlling the diffusion of dopants in organic semiconductors and their stability has proven challenging. Here we present a solution-based approach for electrical p-doping of films of donor conjugated organic semiconductors and their blends with acceptors over a limited depth with a decay constant of 10-20 nm by post-process immersion into a polyoxometalate solution (phosphomolybdic acid, PMA) in nitromethane...
December 5, 2016: Nature Materials
https://www.readbyqxmd.com/read/27918056/proton-conducting-crystalline-porous-materials
#5
REVIEW
Xing Meng, Hai-Ning Wang, Shu-Yan Song, Hong-Jie Zhang
Crystalline porous materials are currently a hot research topic in the field of proton-conducting materials. Crystalline porous materials include metal-organic frameworks (MOFs), coordination polymers (CPs), polyoxometalates (POMs) and covalent organic frameworks (COFs). The designable structures and high surface areas of these materials provide great opportunities to orderly accommodate proton carriers and to systemically modify the concentration and mobility of proton carriers in available spaces. Based on the understanding of the relationship between the structure and proton conductivity, controllable synthesis of porous materials with high proton conductivity will gradually be achieved...
December 5, 2016: Chemical Society Reviews
https://www.readbyqxmd.com/read/27916373/antibiotic-releasing-microspheres-prevent-mesh-infection-in%C3%A2-vivo
#6
Kevin T Grafmiller, Sean T Zuckerman, Clayton Petro, Lijia Liu, Horst A von Recum, Michael J Rosen, Julius N Korley
BACKGROUND: Infection remains a dreaded complication after implantation of surgical prosthetics, particularly after hernia repair with synthetic mesh. We previously demonstrated the ability of a newly developed polymer to provide controlled release of an antibiotic in a linear fashion over 45 d. We subsequently showed that coating mesh with the drug-releasing polymer prevented a Staphylococcus aureus (SA) infection in vivo. To broaden the applicability of this technology, the polymer was synthesized as isolated "microspheres" and loaded with vancomycin (VM) before conducting a noninferiority analysis...
November 2016: Journal of Surgical Research
https://www.readbyqxmd.com/read/27912918/the-use-of-potassium-hydroxide-koh-solution-as-a-suitable-approach-to-isolate-plastics-ingested-by-marine-organisms
#7
Susanne Kühn, Bernike van Werven, Albert van Oyen, André Meijboom, Elisa L Bravo Rebolledo, Jan A van Franeker
In studies of plastic ingestion by marine wildlife, visual separation of plastic particles from gastrointestinal tracts or their dietary content can be challenging. Earlier studies have used solutions to dissolve organic materials leaving synthetic particles unaffected. However, insufficient tests have been conducted to ensure that different categories of consumer products partly degraded in the environment and/or in gastrointestinal tracts were not affected. In this study 63 synthetic materials and 11 other dietary items and non-plastic marine debris were tested...
November 29, 2016: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/27910889/direct-imaging-of-defect-formation-in-strained-organic-flexible-electronics-by-scanning-kelvin-probe-microscopy
#8
Tobias Cramer, Lorenzo Travaglini, Stefano Lai, Luca Patruno, Stefano de Miranda, Annalisa Bonfiglio, Piero Cosseddu, Beatrice Fraboni
The development of new materials and devices for flexible electronics depends crucially on the understanding of how strain affects electronic material properties at the nano-scale. Scanning Kelvin-Probe Microscopy (SKPM) is a unique technique for nanoelectronic investigations as it combines non-invasive measurement of surface topography and surface electrical potential. Here we show that SKPM in non-contact mode is feasible on deformed flexible samples and allows to identify strain induced electronic defects...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27910220/inverse-vulcanization-of-sulfur-with-natural-dienes-as-sustainable-materials-for-lithium-sulfur-batteries
#9
David Mecerreyes, Iñaki Gomez, Alberto Blazquez, Olatz Leonet
Lithium sufur batteries are among the most promising next generation battery systems due to the high capacity properties of sulfur as cathodic material. Beyond its interesting intrinsic properties, sulfur possesses a very low conductivity and complex electrochemistry which involves the high solubility of the lithium sulfides in the electrolyte. These two characteristics trigger a series of limitations on its performance as active cathode material which leads to batteries with low cyclability. Recently, inverse vulcanizated sulfur has shown to retain capacity far better than elemental sulfur leading to batteries with excellent cyclability...
December 2, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27906382/laser-patterned-functionalized-cvd-graphene-as-highly-transparent-conductive-electrodes-for-polymer-solar-cells
#10
Luca La Notte, Enrica Villari, Alessandro Lorenzo Palma, Alberto Sacchetti, Maria Michela Giangregorio, Giovanni Bruno, Aldo Di Carlo, Giuseppe Valerio Bianco, Andrea Reale
A five-layer (5L) graphene on a glass substrate has been demonstrated as a transparent conductive electrode to replace indium tin oxide (ITO) in organic photovoltaic devices. The required low sheet resistance, while maintaining high transparency, and the need of a wettable surface are the main issues. To overcome these, two strategies have been applied: (i) the p-doping of the multilayer graphene, thus reaching 25 Ω □(-1) or (ii) the O2-plasma oxidation of the last layer of the 5L graphene that results in a contact angle of 58° and a sheet resistance of 134 Ω □(-1)...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27905315/spray-coated-carbon-nanotube-carpets-for-creeping-reduction-of-conducting-polymer-based-artificial-muscles
#11
Aiva Simaite, Aude Delagarde, Bertrand Tondu, Philippe Souères, Emmanuel Flahaut, Christian Bergaud
During cyclic actuation, conducting polymer based artificial muscles are often creeping from the initial movement range. One of the likely reasons of such behaviour is unbalanced charging during conducting polymer oxidation and reduction. To improve the actuation reversibility and subsequently the long time performance of ionic actuators, we suggest using spray-coated carbon nanotube (CNT) carpets on the surface of the conducting polymer electrodes. We show that carbon nanotubes facilitate a conducting polymer redox reaction and improve its reversibility...
December 1, 2016: Nanotechnology
https://www.readbyqxmd.com/read/27904497/preparation-of-polypyrrole-embedded-electrospun-poly-lactic-acid-nanofibrous-scaffolds-for-nerve-tissue-engineering
#12
Jun-Feng Zhou, Yi-Guo Wang, Liang Cheng, Zhao Wu, Xiao-Dan Sun, Jiang Peng
Polypyrrole (PPy) is a biocompatible polymer with good conductivity. Studies combining PPy with electrospinning have been reported; however, the associated decrease in PPy conductivity has not yet been resolved. We embedded PPy into poly(lactic acid) (PLA) nanofibers via electrospinning and fabricated a PLA/PPy nanofibrous scaffold containing 15% PPy with sustained conductivity and aligned topography. There was good biocompatibility between the scaffold and human umbilical cord mesenchymal stem cells as well as Schwann cells...
October 2016: Neural Regeneration Research
https://www.readbyqxmd.com/read/27898997/the-effect-of-silica-and-prepolymer-nanoparticles-on-the-mechanical-properties-of-denture-base-acrylic-resin
#13
Pinar Cevik, Arzu Zeynep Yildirim-Bicer
PURPOSE: To evaluate how hydrophobic nanoparticle silica and prepolymer affect the flexural strength, surface hardness, surface roughness, and resilience of a denture base acrylic resin. MATERIALS AND METHODS: A total of 40 denture base acrylic resin specimens with dimensions 65 × 10 × 3 mm(3) were fabricated in this study. Specimens were divided into five experimental groups (n = 8) according to surface-treated silica and prepolymer concentration incorporated into the acrylic resin (weight %) prior to polymerization: G1 acted as control, no fillers were used in this group...
November 29, 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/27897428/functionalization-of-polypyrrole-nano-pipes-with-redox-active-polyoxometalates-poms-for-ultrahigh-energy-density-supercapacitors
#14
Deepak Dubal, Belén Ballesteros, Ashwini Mohite, Pedro Gomez-Romero
Hybrid materials are prominent role-models for the fabrication of high performance supercapacitors. Here, we have explored organic-inorganic hybrid materials based on open-end porous 1D polypyrrole nano-pipes (PPy-NPipes) and heteropolyoxometalate (phosphotungstate ([PW12O40]3- (PW12) or phosphomolybdate [PMo12O40]3- (PMo12)) that display excellent areal capacitances. Two different hybrid materials (PMo12@PPy and PW12@PPy) were effectively synthesized and applied for symmetric supercapacitors. The anchoring of the inorganic nanoclusters onto the conducting polymer nanopipes led indeed to electrodes which stood up to our best expectations exhibiting outstanding areal capacitances which are almost 1...
November 29, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27892593/dual-mode-refractive-index-and-charge-sensing-to-investigate-complex-surface-chemistry-on-nanostructures
#15
Nikhil Bhalla, Doojin Lee, Shivani Sathish, Amy Q Shen
This work presents a novel dual-mode charge and refractive index sensitive device integrated with nanoplasmonic islands, for the first time, on insulator-semiconductor junctions. The developed nano-metal-insulator semiconductor (nMIS) sensor facilitates simultaneous detection of charge and mass changes on the nanoislands due to the binding of biomolecules. The charging of the nanoislands is traced by using the capacitive field-effect electrolyte-metal-insulator-semiconductor structure and the refractive index changes are quantified by measuring the change in the localized surface plasmon resonances of the nanoislands...
November 28, 2016: Nanoscale
https://www.readbyqxmd.com/read/27889510/amine-functionalized-multi-arm-star-polymers-a-novel-platform-for-removing-glyphosate-from-aqueous-media
#16
Lianna Samuel, Ran Wang, Geraud Dubois, Robert Allen, Rudy Wojtecki, Young-Hye La
We describe a novel method for efficiently removing glyphosate from aqueous media via adsorption onto highly functionalized star-shaped polymeric particles. These particles have a polystyrene core with more than 35 attached methacrylate polymer arms, each containing a plurality of pendant amines (poly(dimethylamino ethyl methacrylate): PDMAEMA) that are partially protonated in water. Kinetic studies demonstrate that these star-polymers successfully remove up to 93% of glyphosate present in aqueous solution (feed concentration: 5 ppm), within 10 min contact time, outperforming activated carbon, which removed 33% after 20 min...
November 24, 2016: Chemosphere
https://www.readbyqxmd.com/read/27886233/apparent-power-law-scaling-of-variable-range-hopping-conduction-in-carbonized-polymer-nanofibers
#17
Kyung Ho Kim, Samuel Lara-Avila, Hojin Kang, Hans He, Johnas Eklӧf, Sung Ju Hong, Min Park, Kasper Moth-Poulsen, Satoshi Matsushita, Kazuo Akagi, Sergey Kubatkin, Yung Woo Park
We induce dramatic changes in the structure of conducting polymer nanofibers by carbonization at 800 °C and compare charge transport properties between carbonized and pristine nanofibers. Despite the profound structural differences, both types of systems display power law dependence of current with voltage and temperature, and all measurements can be scaled into a single universal curve. We analyze our experimental data in the framework of variable range hopping and argue that this mechanism can explain transport properties of pristine polymer nanofibers as well...
November 25, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27885758/cost-effective-high-performance-porous-organic-polymer-conductors-functionalized-with-sulfonic-acid-groups-by-direct-postsynthetic-substitution
#18
Dong Won Kang, Kwang Soo Lim, Kyung Jin Lee, Jong Hyeon Lee, Woo Ram Lee, Jeong Hwa Song, Kyu Hyun Yeom, Jin Young Kim, Chang Seop Hong
We demonstrate the facile microwave-assisted synthesis of a porous organic framework 1 and the sulfonated solid (1S) through postsubstitution. Remarkably, the conductivity of 1S showed an approximately 300-fold enhancement at 30 °C as compared to that of 1, and reached 7.72×10(-2)  S cm(-1) at 80 °C and 90 % relative humidity. The superprotonic conductivity exceeds that observed for any conductive porous organic polymer reported to date. This material, which is cost-effective and scalable for mass production, also revealed long-term performance over more than 3 months without conductivity decay...
November 25, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27883183/effect-of-nanoclay-concentration-level-on-the-electrical-properties-of-polypropylene-under-electron-irradiation-in-a-sem
#19
L Ben Ammar, S Fakhfakh, O Jbara, S Rondot
For studying the electrical properties (charge trapping, transport and secondary electron emission) of the polypropylene-based nanocomposites with different contents of natural clay, the specimens were submitted to electron irradiation of a scanning electron microscope. A device, suitably mounted on the sample holder of the scanning electron microscope, was used to measure two currents (i.e. leakage and displacement currents) induced in the polypropylene-based nanocomposites (polymer nanocomposites) under electron irradiation...
November 24, 2016: Journal of Microscopy
https://www.readbyqxmd.com/read/27883135/synthesis-of-mno2-nanoparticles-and-their-effective-utilization-as-uv-protectors-for-outdoor-high-voltage-polymeric-insulators-used-in-power-transmission-lines
#20
Dipankar Ghosh, Subhendu Bhandari, Dipak Khastgir
Polymeric outdoor insulators derived from polydimethyl siloxane (PDMS) are replacing conventional ceramic insulators in high voltage power transmission lines because of their improved electrical, mechanical and hydrophobic performance. Major impediments like failure of polymeric insulators due to natural aging by UV radiation from sunlight and electrical tracking have limited their usage. Herein, it is demonstrated about the usage of manganese dioxide based nanoparticles as an effective agent to prevent the UV accelerated aging of polymeric insulators...
November 24, 2016: Physical Chemistry Chemical Physics: PCCP
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