Read by QxMD icon Read

conductive polymers

Dong-Gue Kang, Minwook Park, Dae-Yoon Kim, Munju Goh, Namil Kim, Kwang-Un Jeong
For the development of advanced heat transfer organic materials (HTOMs) with excellent thermal conductivities, triphenylene-based reactive discogens, 2,3,6,7,10,11-hexakis(but-3-enyloxy) triphenylene (HABET) and 4,4',4'',4''',4'''',4'''''-(triphenylene-2,3,6,7,10,11-hexaylhexakis(oxy)) hexakis(butane-1-thiol) (THBT), were synthesized as discotic liquid crystal (DLC) monomers and crosslinkers, respectively. Temperature-composition phase diagram of HABET-THBT mixtures was first established based on their thermal and microscopic analyses...
October 20, 2016: ACS Applied Materials & Interfaces
Jungmin Seo, Jee Hye Wee, Jeong Hoan Park, Pona Park, Jeong-Whun Kim, Sung June Kim
OBJECTIVE: A novel nerve cuff electrode with embedded magnets was fabricated and developed. In this study, a pair of magnets was fully embedded and encapsulated in a liquid crystal polymer (LCP) substrate to utilize magnetic force in order to replace the conventional installing techniques of cuff electrodes. In vitro and in vivo experiments were conducted to evaluate the feasibility of the magnet-embedded nerve cuff electrode (MENCE). Lastly, several issues pertaining to the MENCE such as the cuff-to-nerve diameter ratio, the force of the magnets, and possible concerns were discussed in the discussion section...
October 20, 2016: Journal of Neural Engineering
Naader Alizadeh, Ehsan Shamaeli, Masooma Fazili
PURPOSE: The potential of electrochemical/temperature dual stimuli-responsive conducting polymer to be used as general drug delivery systems. It allows on-demand release of incorporated drug is kinetically investigated in real time. METHODS: Online spectroscopic monitoring was used to investigate the electrochemically/thermally controlled release behavior of a model drug (naproxen) from drug-doped polypyrrole (DDPPy) film. Avrami's equation has been used to study the kinetics and further analyzing has been carried out using the Arrhenius and the Eyring equations...
October 19, 2016: Pharmaceutical Research
Minh T Nguyen, Richard A Jones, Bradley J Holliday
CdSe nanocrystals with tunable sizes and distributions were synthesized directly from Cd(ii) ions coordinated to the conjugated backbone of a thiophene-based conducting metallopolymer. Using our seeded growth technique, the resulting nanocrystals are in direct electronic communication with the polymer, which leads to effective charge transfer between the donor and acceptor.
October 19, 2016: Chemical Communications: Chem Comm
Punam Dalai, Hannes Lukas Pleyer, Henry Strasdeit, Stefan Fox
On the Hadean-Early Archean Earth, the first islands must have provided hot and dry environments for abiotically formed organic molecules. The heat sources, mainly volcanism and meteorite impacts, were also available on Mars during the Noachian period. In recent work simulating this scenario, we have shown that neat glycine forms a black, sparingly water-soluble polymer ("thermomelanoid") when dry-heated at 200 °C under pure nitrogen. The present study explores whether relevant minerals and mineral mixtures can change this thermal behavior...
October 18, 2016: Origins of Life and Evolution of the Biosphere
M T Camci, P Aydogan, B Ulgut, C Kocabas, S Suzer
We present an X-ray photoelectron spectroscopic (XPS) investigation of potential screening across two gold electrodes fabricated on a porous polymer surface which is impregnated with the ionic liquid (IL) N-N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium bis(trifluoromethanesulfonyl)imide [DEME-TFSI]. The IL provides a sheet of conducting layers to the insulating polymer film, and allows monitoring charging and screening dynamics at the polymer + IL/vacuum interface in a laterally resolved fashion across the electrodes...
October 19, 2016: Physical Chemistry Chemical Physics: PCCP
Hohyeon Lee, Haemin Kim, Thang Phan Nguyen, Jin Ho Chang, Soo Young Kim, Hyuncheol Kim, Eunah Kang
Photoacoustic activity is the generation of an ultrasonic signal via thermal expansion or bubble formation, stimulated by laser irradiation. Photoacoustic nanoplatforms have recently gained focus for application in bio-electric interfaces. Various photoacoustic material types have been evaluated, including gold nanoparticles, semiconductive π-conjugating polymers (SP), etc. In this study, surfactant-free methoxy-polyethylene glycol-co-polypyrrole copolymer (mPEG-co-PPyr) nanoparticles (NPs) and mPEG-co-PPyr NP/molybdenum disulfide (mPEG-co-PPyr/MoS2) nanocomposites (NCs) were prepared and their photoacoustic activity was demonstrated...
October 18, 2016: ACS Applied Materials & Interfaces
Mingqiang Wang, Shuai Zhang, Yuanjun Song, Jidong Dong, Huawei Wei, Huaquan Xie, Xiaojiao Fang, Lu Shao, Yudong Huang, Zaixing Jiang
Graphene oxide nanoribbons (GONRs) are one of the most promising carbon based materials. The integration of 2D GONR sheets into macroscopic materials, such as continuous fibers or film, leads the way in translating the good properties of individual GONR sheets into macroscopic and ordered materials for future applications. In this study, we first report the fabrication of GONR fibers utilizing GONR sheets as the raw material without any supporting surfactant or polymer. The method of fabricating fibers is referred to as '3D solution printing'...
October 17, 2016: Nanotechnology
Dong Jin Lee, G Mohan Kumar, P Ilanchezhiyan, Jae-Chul Lee, Sung Ryong Ryu, Tae Won Kang
Nowadays, solid-state inorganic-organic hybrid solar cells based on one-dimensional (1D) inorganic semiconducting nanostructures and organic polymers are believed to offer convincing solutions for the realm of next generation solar cells. In this regard, 1D ZnCdS nanowire (NW) arrays were fabricated on transparent conducting substrates through a catalyst free co-evaporation method and their wurtzite structural characteristics, 1D morphological layout and valence state/composition were studied in detail using X-ray diffraction, high-resolution electron microscopy and X-ray photoelectron spectroscopy, respectively...
October 5, 2016: Journal of Colloid and Interface Science
Giovanni Fusco, Francesca Gallo, Cristina Tortolini, Paolo Bollella, Federica Ietto, Antonella De Mico, Andrea D'Annibale, Riccarda Antiochia, Gabriele Favero, Franco Mazzei
In this work, we developed an impedimetric label-free immunosensor for the detection of 2,4-Dichlorophenoxy Acetic Acid (2,4-D) herbicide either in standard solution and spiked real samples. For this purpose, we prepared by electropolymerization a conductive polymer poly-(aniline-co-3-aminobenzoic acid) (PANABA) then we immobilized anti-2,4-D antibody onto a nanocomposite AuNPs-PANABA-MWCNTs employing the carboxylic moieties as anchor sites. The nanocomposite was synthesized by electrochemical polymerization of aniline and 3-aminobenzoic acid, in the presence of a dispersion of gold nanoparticles, onto a multi-walled carbon nanotubes-based screen printed electrode...
October 5, 2016: Biosensors & Bioelectronics
Felipe de Salas, Isabel Pardo, Horacio J Salavagione, Pablo Aza, Eleni Amougi, Jesper Vind, Angel T Martínez, Susana Camarero
Polyaniline is a conductive polymer with distinctive optical and electrical properties. Its enzymatic synthesis is an environmentally friendly alternative to the use of harsh oxidants and extremely acidic conditions. 7D5L, a high-redox potential laccase developed in our lab, is the biocatalyst of choice for the synthesis of green polyaniline (emeraldine salt) due to its superior ability to oxidize aniline and kinetic stability at the required polymerization conditions (pH 3 and presence of anionic surfactants) as compared with other fungal laccases...
2016: PloS One
Xuewei Fu, Yead Jewel, Yu Wang, Jin Liu, Wei-Hong Katie Zhong
Simultaneous achievement of good electrochemical and mechanical properties is crucial for practical applications of solid ion conductors. Conventional polymer conductors suffer from low conductivity, low transference number and deteriorated mechanical properties with the enhancement of conductivity, resulting from the coupling between ion transport and polymer movement. Here we present a successful fabrication and fundamental understanding of a high performance soy protein-based solid conductor. The conductor shows ionic conductivity of ~ 10(-5) S/cm, transference number of 0...
October 14, 2016: Journal of Physical Chemistry Letters
Qingyu Peng, Hongqiu Wei, Yuyang Qin, Zaishan Lin, Xu Zhao, Fan Xu, Jinsong Leng, Xiaodong He, Anyuan Cao, Yibin Li
Electrical stimulation of shape-memory polymers (SMPs) has many advantages over thermal methods; creating an efficient conductive path through the bulk polymers is essential for developing high performance electroactive systems. Here, we show that a three-dimensional (3D) porous carbon nanotube sponge can serve as a built-in integral conductive network to provide internal, homogeneous, in situ Joule heating for shape-memory polymers, thus significantly improving the mechanical and thermal behavior of SMPs. As a result, the 3D nanocomposites show a fast response and produce large exerting forces (with a maximum flexural stress of 14...
October 14, 2016: Nanoscale
Benjamin P Partlow, Mehran Bagheri, James L Harden, David L Kaplan
Native silk fibers exhibit strength and toughness that rival those of the best synthetic fibers. Importantly, the silkworm is able to spin these fibers using only water as a solvent with fine control of applied shear, drawing, pH and salt concentrations to efficiently convert the spinning dope into a fiber. This is in contrast to synthetic polymers that often require organic solvents and extreme processing conditions. Further insight is still needed into the mechanisms by which silkworms are capable of spinning such tough fibers...
October 13, 2016: Biomacromolecules
Ali Aldalbahi, Peter Feng, Norah Alhokbany, Eida Al-Farraj, Saad M Alshehri, Tansir Ahamad
Functionalized (MWCNTs-COOH), non-functionalized multiwalled carbon nanotubes (MWCNTs) and polyaniline (PANI) based conducting nanocomposites (PANI/polymer/MWCNTs and PANI/polymer/MWCNTs-COOH) have been prepared in polymer matrix. The prepared nanocomposites were characterized via FTIR, TGA, Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). It was observed that the prepared conducting nanocomposites show excellent sensing performances toward CH4 at room temperature and both the response and recovery time were recorded at around 5s, respectively, at the room...
September 12, 2016: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
XiaoHao Sun, HengAn Wu, Rong Long
We study a covalent adaptable polymer that can rearrange its network topology through thermally activated bond exchange reactions. When the polymer is deformed, such a network rearrangement leads to macroscopic stress relaxation, which allows the polymer to be thermoformed without a mold. Based on a previously developed constitutive model, we investigate thermal-mechanical behaviors of this material under a non-uniform and evolving temperature field through numerical simulations. Our focus is on the complex coupling between mechanical deformation, heat conduction and bond exchange reactions...
October 12, 2016: Soft Matter
Sunbin Hwang, William J Potscavage, Yu Seok Yang, In Seob Park, Toshinori Matsushima, Chihaya Adachi
Recent progress in conducting polymer-based organic thermoelectric generators (OTEGs) has resulted in high performance due to high Seebeck coefficient, high electrical conductivity (σ), and low thermal conductivity obtained by chemically controlling the materials's redox levels. In addition to improving the properties of individual OTEGs to obtain high performance, the development of solution processes for the fabrication of OTEG modules is necessary to realize large thermoelectric voltage and low-cost mass production...
October 12, 2016: Physical Chemistry Chemical Physics: PCCP
Dedeepya Uppalapati, Ben J Boyd, Sanjay Garg, Jadranka Travas-Sejdic, Darren Svirskis
Conducting polymers (CPs) are redox active materials with tunable electronic and physical properties. The charge of the CP backbone can be manipulated through redox processes, with accompanied movement of ions into and out of the polymer to maintain electrostatic neutrality. CPs with defined micro- or nanostructures have greatly enhanced surface areas, compared to conventionally prepared CPs. The resulting high surface area interface between polymer and liquid media facilities ion exchange and can lead to larger and more rapid responses to redox cycling...
September 29, 2016: Biomaterials
Karina Ferreira Noronha Cruz, Daniela Maria Ducatti Formaggio, Dayane Batista Tada, Fernando Henrique Cristovan, Lilia Müller Guerrini
Electroactive nanofibers based on thermoplastic polyurethane (TPU) and poly (alkoxy anilines) produced by electrospinning has been explored for biomaterials applications. The thermoplastic polyurethane is a biocompatible polymer with good mechanical properties. The production of TPU nanofibers requires the application of high voltage during electrospinning in order to prepare uniform mats due to its weak ability to elongate during the process. In order to overcome this limitation, a conductive polymer can be incorporated to the process, allowing generates mats without defects...
October 11, 2016: Journal of Biomedical Materials Research. Part A
Qiang Ma, Xingguo Qi, Bo Tong, Yuheng Zheng, Wenfang Feng, Jin Nie, Yongsheng Hu, Hong Li, Xuejie Huang, Liquan Chen, Zhi-Bin Zhou
Solid polymer electrolytes (SPEs) would be promising candidates for application in high-energy rechargeable lithium (Li) batteries to replace the conventional organic liquid electrolytes, in terms of the enhanced safety and excellent design flexibility. Herein, we report novel perfluorinated sulfonimide salt-based SPEs, composed of lithium (trifluoromethanesulfonyl)(n-nonafluorobutanesulfonyl)imide (Li[(CF3SO2)(n-C4F9SO2)N, LiTNFSI) and poly(ethylene oxide) (PEO), which exhibit relatively efficient ionic conductivity (e...
October 11, 2016: ACS Applied Materials & Interfaces
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"