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conductive polymers

Srabanti Ghosh, Laurence Ramos, Hynd Remita
Materials are the key roadblocks for the commercialization of energy conversion devices in fuel cells and solar cells. Significant research has focused on tuning the intrinsic properties of materials at the nanometer scale. The soft template mediated controlled fabrication of advanced nanostructured materials is attracting considerable interest due to the promising applications of these materials in catalysis and electrocatalysis. Swollen hexagonal lyotropic liquid crystals (SLCs) consist of oil-swollen surfactant-stabilized 1D, 2D or 3D nanometric assemblies regularly arranged in an aqueous solvent...
March 16, 2018: Nanoscale
Chao Wang, Zhi-Yi Hu, Heng Zhao, Wenbei Yu, Sijia Wu, Jing Liu, Lihua Chen, Yu Li, Bao-Lian Su
We report three types of conducting polymers (CPs), polyaniline (PANI), polypyrrole (PPY) and poly (3,4-ethylenedioxythiophene) (PEDOT) to modify the surface of the CdS nanorods to probe their photocorrosion inhibition and photocatalytic hydrogen production. Various characterizations, such as high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV) and density function theory (DFT) calculations have been conducted to reveal the intrinsic structure of the as-constructed CPs@CdS (@ means CPs at the surface of CdS) core-shell nanorods...
March 6, 2018: Journal of Colloid and Interface Science
Fenhong Song, Dapeng Ju, Fangwei Gu, Yan Liu, Yuan Ji, Yulin Ren, Xiaocong He, Baoyong Sha, Ben Q Li, Qingzhen Yang
Electric field induced micro/nano patterns in thin polymer film, sometimes referred as electrohydrodynamic patterning, is a promising technique to fabricate micro/nano structures. Extensive attentions have been attracted due to its advantages in micro contact (easy demolding) and low cost. Although considerable work has been done on this technique, including both experimental and theoretical ones, there still appears a requirement for understanding the mechanism of electrohydrodynamic patterning. Thus we systematically studied the effect of different parameters on electrohydrodynamic patterning with a numerical phase field model...
March 15, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Lin Lei, Dylan A Kovacevich, Michael P Nitzsche, Jihyun Ryu, Kutaiba Al-Marzoki, Gabriela Rodriguez, Lisa Klein, Andrei Jitianu, Jonathan P Singer
The electrospray process utilizes the balance of electrostatic forces and surface tension within a charged spray to produce charged microdroplets with a narrow dispersion in size. In electrospray deposition, each droplet carries a small quantity of suspended material to a target substrate. Past electrospray deposition results fall into two major categories: (1) continuous spray of films onto conducting substrates and (2) spray of isolated droplets onto insulating substrates. A cross-over regime, or a self-limited spray, has only been limitedly observed in the spray of insulating materials onto conductive substrates...
March 15, 2018: ACS Applied Materials & Interfaces
Yancong Feng, Rui Tan, Yan Zhao, Rongtan Gao, Luyi Yang, Jinlong Yang, Hao Li, Guofu Zhou, Haibiao Chen, Feng Pan
A novel hybrid single Li-ion conductor (SLIC) for a Li-ion solid electrolyte was prepared by mixing aluminate complexes-polyethylene glycol (LiAl-PEG) and polyethylene oxide (PEO) for solid-state Li-ion batteries. The LiAl-PEG/PEO blend possesses high thermal stability and electrochemical stability with an oxidation decomposition voltage up to 4.8 V. Notably, this hybrid SLIC exhibits not only excellent Li-ion migration kinetics, but also good ionic conductivity as high as 4.0 × 10-5 and 2.6 × 10-4 S cm-1 at 30 and 100 °C, respectively, which is much higher than previously reported SLICs...
March 15, 2018: Nanoscale
Xiaoye Yang, Xiaoqun Shi, Jianbo Ji, Guangxi Zhai
The development of imaging-guided smart drug delivery systems for combinational photodynamic/chemotherapy of the tumor has become highly demanded in oncology. Herein, redox-responsive theranostic polymeric nanoparticles (NPs) were fabricated innovatively using low molecular weight heparin (LWMH) as the backbone. Chlorin e6 (Ce6) and alpha-tocopherol succinate (TOS) were conjugated to LMWH via cystamine as the redox-sensitive linker, forming amphiphilic Ce6-LMWH-TOS (CHT) polymer, which could self-assemble into NPs in water and encapsulate paclitaxel (PTX) inside the inner core (PTX/CHT NPs)...
November 2018: Drug Delivery
Ganhua Xie, Pei Li, Zhiju Zhao, Zhongpeng Zhu, Xiang-Yu Kong, Zhen Zhang, Kai Xiao, Liping Wen, Lei Jiang
Water wetting behavior in nano-confined environments plays an important role in mass transport and signal trans-mission of organisms. It is valuable and challengeable to investigate how water behaves in such a nanometer-scale with external stimuli, in particular with electric field and light. Unfortunately, the mechanism of hydrophobic reaction inside the nano-spaces is still obscure and lacks of experimental supporting for the current electric-field- or photo-responsive nanochannels which suffer from fragility or monofunctionality...
March 15, 2018: Journal of the American Chemical Society
N Shaari, S K Kamarudin, S Basri, L K Shyuan, M S Masdar, D Nordin
The high methanol crossover and high cost of Nafion® membrane are the major challenges for direct methanol fuel cell application. With the aim of solving these problems, a non-Nafion polymer electrolyte membrane with low methanol permeability and high proton conductivity based on the sodium alginate (SA) polymer as the matrix and sulfonated graphene oxide (SGO) as an inorganic filler (0.02-0.2 wt%) was prepared by a simple solution casting technique. The strong electrostatic attraction between -SO3 H of SGO and the sodium alginate polymer increased the mechanical stability, optimized the water absorption and thus inhibited the methanol crossover in the membrane...
March 13, 2018: Nanoscale Research Letters
Tian Li, Jianwei Song, Xinpeng Zhao, Zhi Yang, Glenn Pastel, Shaomao Xu, Chao Jia, Jiaqi Dai, Chaoji Chen, Amy Gong, Feng Jiang, Yonggang Yao, Tianzhu Fan, Bao Yang, Lars Wågberg, Ronggui Yang, Liangbing Hu
There has been a growing interest in thermal management materials due to the prevailing energy challenges and unfulfilled needs for thermal insulation applications. We demonstrate the exceptional thermal management capabilities of a large-scale, hierarchal alignment of cellulose nanofibrils directly fabricated from wood, hereafter referred to as nanowood. Nanowood exhibits anisotropic thermal properties with an extremely low thermal conductivity of 0.03 W/m·K in the transverse direction (perpendicular to the nanofibrils) and approximately two times higher thermal conductivity of 0...
March 2018: Science Advances
Hyosung An, Touseef Habib, Smit Shah, Huili Gao, Miladin Radovic, Micah J Green, Jodie L Lutkenhaus
Stretchable, bendable, and foldable conductive coatings are crucial for wearable electronics and biometric sensors. These coatings should maintain functionality while simultaneously interfacing with different types of surfaces undergoing mechanical deformation. MXene sheets as conductive two-dimensional nanomaterials are promising for this purpose, but it is still extremely difficult to form surface-agnostic MXene coatings that can withstand extreme mechanical deformation. We report on conductive and conformal MXene multilayer coatings that can undergo large-scale mechanical deformation while maintaining a conductivity as high as 2000 S/m...
March 2018: Science Advances
Barbara Davis, Monique Williams, Prue Talbot
OBJECTIVE: To evaluate performance of the I quit original smoking (iQOS) heat-not-burn system as a function of cleaning and puffing topography, investigate the validity of manufacturer's claims that this device does not burn tobacco and determine if the polymer-film filter is potentially harmful. METHODS: iQOS performance was evaluated using five running conditions incorporating two different cleaning protocols. Heatsticks were visually and stereomicroscopically inspected preuse and postuse to determine the extent of tobacco plug charring (from pyrolysis) and polymer-film filter melting, and to elucidate the effects of cleaning on charring...
March 13, 2018: Tobacco Control
Wenjia Wu, Yifan Li, Jindun Liu, Jingtao Wang, Yakun He, Kenneth Davey, Shi-Zhang Qiao
Nanophase-separated membranes hold promise for fast molecule or ion transfer. However, development and practical application are significantly hindered by both the difficulty of chemical modification and nanophase instability. This can be addressed by organic-inorganic hybridization of functional fillers with a precise distribution in specific nanophase. Here, a molecular-level hybridization for nanophase-separated Nafion using 2-5 nm quantum dots (QDs) as a new smart filler is demonstrated. Two kinds of QDs are prepared and used: hydrophilic polymer-like QDs (PQDs) and hydrophobic graphene oxide QDs (GQDs)...
March 13, 2018: Advanced Materials
Shunli Liu, Kewen Li, Imtiaz Hussain, Olayinka Oderinde, Fang Yao, Jiuyang Zhang, Guo Dong Fu
Mechanically-tough and electrical conductive self-healing hydrogels may have broad applications in wearable electronics, health-monitoring systems, and smart robotics in the following years. Here, we proposed a new design strategy to synthesize a dual physical cross-linked polyethylene glycol/poly(acrylic acid) (PEG/PAA) double network hydrogel, consisting of an ferric ions cross-linked linear chain extension of PEG (2, 6-pyridinedicarbonyl moieties incorporated in the PEG backbone, PEG-H2pdca) as the first physical network and a PAA-Fe3+ gel as the second physical network...
March 13, 2018: Chemistry: a European Journal
Koen H Hendriks, Sophia G Robinson, Miles N Braten, Christo S Sevov, Brett A Helms, Matthew S Sigman, Shelley D Minteer, Melanie S Sanford
Nonaqueous redox flow batteries (NRFBs) represent an attractive technology for energy storage from intermittent renewable sources. In these batteries, electrical energy is stored in and extracted from electrolyte solutions of redox-active molecules (termed catholytes and anolytes) that are passed through an electrochemical flow cell. To avoid battery self-discharge, the anolyte and catholyte solutions must be separated by a membrane in the flow cell. This membrane prevents crossover of the redox active molecules, while simultaneously allowing facile transport of charge-balancing ions...
February 28, 2018: ACS Central Science
Pengfei Zhao, Qingxin Tang, Xiaoli Zhao, Yanhong Tong, Yichun Liu
The application of conductive polymer polypyrrole (PPY) towards transparent and flexible electronics has been demonstrated by a photolithography-compatible technique. The oxygen plasma pretreatment was found to be important for successful fabrication of PPY electrode patterns on flexible poly(ethylene terephthalate) (PET). By the patterning process of PPY, the transparency of PPY electrode can be improved up to >80% over the visible spectrum, which combined with the excellent chemical and physical stability of PPY shows the huge potential of PPY electrode as flexible transparent conductive electrode...
February 23, 2018: Journal of Colloid and Interface Science
Taichi Ikeda
Glycidyl triazolyl polymer (GTP), which is the product of the Huisgen dipolar cycloaddition reaction between glycidyl azide polymer and alkyne derivatives, is featured here. GTP is the multifunctionalized poly(ethylene glycol) (PEG). The drawback of PEG is that linear PEG has the functional group only at both ends. The low loading capability of the functional groups limits the possibilities of PEG applications. GTP facilitates the synthesis of multifunctionalized PEG derivatives. In this article, 74 examples of GTP homopolymers and copolymers are introduced...
March 12, 2018: Macromolecular Rapid Communications
A Bakkar, F Lafolet, D Roldan, E Puyoo, D Jouvenot, G Royal, E Saint-Aman, S Cobo
Photochromic coordination polymers, based on zinc(ii) bis-terpyridine-appended dimethyldihydropyrene building blocks, have been synthesized following stepwise synthesis on a surface yielding photo-switchable molecular junctions. Under irradiation, reversible structural changes occur by the isomerization of the photosensitive units, thus inducing conductance switching of the molecular junctions with a good reproducibility.
March 12, 2018: Nanoscale
Junliang Han, Feifei Tong, Ping Chen, Xiancai Zeng, Zhengyong Duan
This paper used piezoelectric sensor to study the dysfunction of endothelial cell monolayer barrier caused by inflammatory factors. The biocompatible conductive polymer membrane of pPy[pGlu]-pLys was prepared on the surface of the ITO work electrode to improve the interface between the endothelial cell and the electrode. Both the impedance analysis data and the stable plateau stage of sensor's frequency shift indicated that endothelial cells formed a good monolayer barrier on this polymer surface. The response frequency shifts of lipopolysaccharide (LPS)- and histamine-induced endothelial barrier dysfunction were different, which distinguished their different stimulation mechanism...
March 2, 2018: Biosensors & Bioelectronics
Antonio Di Martino, Marina E Trusova, Pavel S Postnikov, Vladimir Sedlarik
An innovative microcarrier based on a carboxy-enriched and branched polylactic acid derivative was developed to enhance the in vitro phototoxicity of the photosensitizer and prodrug 5-aminolevulinic. Microparticles, prepared by double emulsion technique and loaded with the prodrug were carefully characterized and the effect of the polymer structure on the chemical, physical and biological properties of the final product was evaluated. Results showed that microparticles have a spherical shape and ability to allocate up to 30 μg of the photosensitizer per mg of carrier despite their difference in solubility...
March 3, 2018: Journal of Photochemistry and Photobiology. B, Biology
Frida Román, Pere Colomer, Yolanda Calventus, John M Hutchinson
Two different commercial hyperbranched poly(ethyleneimine)s (HBPEI), with molecular weights (MW) of 800 and 25,000 g/mol, and denoted as PEI800 and PEI25000, respectively, as well as the mixtures with a Diglycidyl Ether of Bisphenol-A (DGEBA) epoxy resin, have been studied using thermal analysis techniques (DSC, TGA), dielectric relaxation spectroscopy (DRS), and dynamic mechanical analysis (DMA). Only a single glass transition is observed in these mixtures by DSC. DRS of the HBPEIs shows three dipolar relaxations: γ, β, and α...
March 9, 2018: Materials
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