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https://www.readbyqxmd.com/read/28107665/a-%C3%AF-%C3%AF-conjugation-containing-soft-and-conductive-injectable-polymer-hydrogel-highly-efficiently-rebuilds-cardiac-function-after-myocardial-infarction
#1
Rui Bao, Baoyu Tan, Shuang Liang, Ning Zhang, Wei Wang, Wenguang Liu
Previous studies suggested that a stiffer hydrogel system exhibited a better performance to promote heart function after myocardial infarction (MI). However, the nature of myocardium, a tissue that alternately contracts and relaxes with electrical impulses, leads us to hypothesize that a soft and conductive hydrogel may be in favor of mechanical and electrical signals transmission to enhance heart function after MI. In this work, π-π conjugation interaction was first employed to produce a soft injectable hydrogel with conductive property...
January 12, 2017: Biomaterials
https://www.readbyqxmd.com/read/28105604/influence-of-working-temperature-on-the-formation-of-electrospun-polymer-nanofibers
#2
Guang-Zhi Yang, Hai-Peng Li, Jun-He Yang, Jia Wan, Deng-Guang Yu
Temperature is an important parameter during electrospinning, and virtually, all solution electrospinning processes are conducted at ambient temperature. Nanofiber diameters presumably decrease with the elevation of working fluid temperature. The present study investigated the influence of temperature variations on the formation of polymeric nanofibers during single-fluid electrospinning. The surface tension and viscosity of the fluid decreased with increasing working temperature, which led to the formation of high-quality nanofibers...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28105396/a-solution-doped-polymer-semiconductor-insulator-blend-for-thermoelectrics
#3
David Kiefer, Liyang Yu, Erik Fransson, Andrés Gómez, Daniel Primetzhofer, Aram Amassian, Mariano Campoy-Quiles, Christian Müller
Poly(ethylene oxide) is demonstrated to be a suitable matrix polymer for the solution-doped conjugated polymer poly(3-hexylthiophene). The polarity of the insulator combined with carefully chosen processing conditions permits the fabrication of tens of micrometer-thick films that feature a fine distribution of the F4TCNQ dopant:semiconductor complex. Changes in electrical conductivity from 0.1 to 0.3 S cm(-1) and Seebeck coefficient from 100 to 60 μV K(-1) upon addition of the insulator correlate with an increase in doping efficiency from 20% to 40% for heavily doped ternary blends...
January 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28103488/effects-of-superabsorbent-polymers-on-the-fate-of-fungicidal-carbendazim-in-soils
#4
Yatian Yang, Haiyan Wang, Lei Huang, Sufen Zhang, Yupeng He, Qi Gao, Qingfu Ye
Superabsorbent polymers (SAPs) have been extensively used as soil amendments to retain water, and they often coexist with pesticides in agricultural fields. However, effects of SAPs on the fate of pesticides in soil remain poorly understood. In this study, a laboratory experiment was conducted to evaluate the effects of SAPs on the transformation of (14)C-carbendazim in soils. The results showed that compared to the SAPs-free control, 11.4% relative reduction of (14)C-carbendazim extractable residue was observed in red clayey soil with SAPs amendment after 100days of incubation (p<0...
January 8, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28103044/when-salt-rejecting-polymers-meet-protons-an-electrochemical-impedance-spectroscopy-investigation
#5
Noga Fridman-Bishop, Viatcheslav Freger
Polymeric membranes are widely used for salt removal, but mechanism of ion permeation is still insufficiently understood. Here we analyze ion transport and scaling in polymers relevant to desalination (dense aromatic polyamide Nomex and cellulose acetate, CA) using impedance spectroscopy (EIS), focusing on the effects of the salt type, concentration and pH. The results highlight the role of proton uptake in ion permeation. For Nomex the exceptionally high affinity to proton results in a power-low dependence of conductivity on salt concentrations with an unusual exponent 1/2...
January 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28103039/single-walled-carbon-nanotubes-mimics-of-biological-ion-channels
#6
Hasti Amiri, Kenneth L Shepard, Colin Nuckolls, Raúl Hernández Sánchez
Here we report on the ion conductance through individual, small diameter single-walled carbon nanotubes. We find that they are mimics of ion channels found in natural systems. We explore the factors governing the ion selectivity and permeation through single-walled carbon nanotubes by considering an electrostatic mechanism built around a simplified version of the Gouy-Chapman theory. We find that the single-walled carbon nanotubes preferentially transported cations and that the cation permeability is size-dependent...
January 19, 2017: Nano Letters
https://www.readbyqxmd.com/read/28098293/polyaniline-nanofibers-broadening-applications-for-conducting-polymers
#7
REVIEW
Christina O Baker, Xinwei Huang, Wyatt Nelson, Richard B Kaner
Polyaniline is a conducting polymer with incredible promise, but it has had limited use due to poor reaction control and processability associated with conventional morphologies. Polyaniline nanofibers, on the other hand, have demonstrated, through manufacturing techniques discovered during the past decade, increased processability, higher surface area, and improved consistency and stability in aqueous dispersions, which are finally allowing for expanded commercial development of this promising polymer. This review explores some intriguing applications of polyaniline nanofibers, as well as the advantages and remaining challenges in developing better products using polyaniline in this new morphology...
January 18, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28098280/single-lithium-ion-conducting-solid-polymer-electrolytes-advances-and-perspectives
#8
REVIEW
Heng Zhang, Chunmei Li, Michal Piszcz, Estibaliz Coya, Teofilo Rojo, Lide M Rodriguez-Martinez, Michel Armand, Zhibin Zhou
Electrochemical energy storage is one of the main societal challenges to humankind in this century. The performances of classical Li-ion batteries (LIBs) with non-aqueous liquid electrolytes have made great advances in the past two decades, but the intrinsic instability of liquid electrolytes results in safety issues, and the energy density of the state-of-the-art LIBs cannot satisfy the practical requirement. Therefore, rechargeable lithium metal batteries (LMBs) have been intensively investigated considering the high theoretical capacity of lithium metal and its low negative potential...
January 18, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28094935/sulfonic-group-functionalized-mixed-ligand-coordination-polymers-synthesis-characterization-water-sorption-and-proton-conduction-studies
#9
Dilip Kumar Maity, Kenichi Otake, Saheli Ghosh, Hiroshi Kitagawa, Debajyoti Ghoshal
Five sulfonic acid group functionalized mixed ligand coordination polymers (CPs), namely, {[Zn(bpeH)(5-sip)(H2O)]·(H2O)}n (1), {[Cu(pyz)(5-Hsip)(H2O)2]·(H2O)2}n (2), {[Cu(bpee)0.5(5-sip)(H2O)2]·(H2O)4(bpeeH2)0.5}n (3), {[Cu(bpy)(5-Hsip)(H2O)]·(H2O)2}n (4), and {[Cu(bpy)2(5-H2sip)2]·(H2O)6}n (5) [where sip(3-) = 5-sulfoisophthalate; bpe = 4,4'-bispyridylethane; pyz = pyrazine; bpee = 4,4'-bispyridylethylene; bpy = 4,4'-bipyridine], have been synthesized with varying different N,N'-donor linkers using slow diffusion techniques at room temperature...
January 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28092153/removable-large-area-ultra-smooth-silver-nanowire-transparent-composite-electrode
#10
Yunxia Jin, Kaiqing Wang, Yuanrong Cheng, Qibing Pei, Yuxi Xu, Fei Xiao
In this work, a composite silver nanowire (AgNW) transparent electrode that is large-area ultra-smooth without conductivity or transmittance scarifice, removable but with good resistance to both water and organic solvent is reported. Via a simple low-temperature solution process without complicated transfer steps or additional pressure pressing, a new kind of AgNWs composite with biocompatible and patternable chitosan polymer complex demonstrates a quite low RMS (root mean square) roughness ~7 nm at a largest reported scan size of 50 μm*50 μm, which is among the best flat surface...
January 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28091636/assessing-the-electrochemical-properties-of-polypyridine-and-polythiophene-for-prospective-applications-in-sustainable-organic-batteries
#11
Rafael B Araujo, Amitava Banerjee, Puspamitra Panigrahi, Li Yang, Martin Sjödin, Maria Strømme, C Moyses Araujo, Rajeev Ahuja
Conducting polymers are being considered promising candidates for sustainable organic batteries mainly due to their fast electron transport properties and high recyclability. In this work, the key properties of polythiophene and polypyridine have been assessed through a combined theoretical and experimental study focusing on such applications. A theoretical protocol has been developed to calculate redox potentials in solution within the framework of the density functional theory and using continuous solvation models...
January 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28090735/high-throughput-protein-targeted-biomolecular-detection-using-frequency-domain-faraday-rotation-spectroscopy
#12
Richard J Murdock, Shawn A Putnam, Soumen Das, Ankur Gupta, Elyse D Z Chase, Sudipta Seal
A clinically relevant magneto-optical technique (fd-FRS, frequency-domain Faraday rotation spectroscopy) for characterizing proteins using antibody-functionalized magnetic nanoparticles (MNPs) is demonstrated. This technique distinguishes between the Faraday rotation of the solvent, iron oxide core, and functionalization layers of polyethylene glycol polymers (spacer) and model antibody-antigen complexes (anti-BSA/BSA, bovine serum albumin). A detection sensitivity of ≈10 pg mL(-1) and broad detection range of 10 pg mL(-1) ≲ cBSA ≲ 100 µg mL(-1) are observed...
January 16, 2017: Small
https://www.readbyqxmd.com/read/28089938/3d-printed-rf-probeheads-for-low-cost-high-throughput-nmr
#13
R Adam Horch, John C Gore
3D printing has been exploited as a means to fabricate complete NMR probeheads containing arrays of miniature RF circuits for high-throughput solution-state NMR spectroscopy and potentially other purposes. 3D-printed NMR circuits of millimeter scale were constructed consisting of RF coils, variable tuning/matching capacitors, and liquid NMR sample cavities. Channels and cavities capable of being addressed using microfluidics are included in the probehead structure, providing a means for hydraulically-controlled RF tuning/matching and liquid NMR sample loading/unloading...
January 12, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28080999/electrochemical-depositing-rgo-ti-rgo-heterogeneous-substrates-with-higher-thermal-conductivity-and-heat-transfer-performance-compared-to-pure-ti
#14
Jing Wang, Huatao Wang, Wenying Zhang, Xinyi Yang, Guangwu Wen, Yijie Wang, Weiwei Zhou
Titanium (Ti) and its alloys are widely applied in many high strength, light weight applications, but their thermal conductivity is lower compared to that of other metals, which limits their further applications. In this paper, we demonstrated experimentally that rGO-Ti-rGO heterogeneous substrates with higher thermal conductivity, up to ∼38.8% higher than Ti, could be fabricated by electrochemical depositing rGO on their surface. The rGO layers are grown on the surface of Ti substrates, with appearance of bedclothes on the beds...
January 12, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28080021/an-ionic-liquid-as-interface-linker-for-tuning-piezoresistive-sensitivity-and-toughness-in-poly-vinylidene-fluoride-carbon-nanotube-composites
#15
Kai Ke, Petra Potschke, Shanglin Gao, Brigitte Voit
Conductive polymer nanocomposites (CPNCs) have emerged as potential alternatives for metallic foil sensors and semiconductor strain gauges. The simultaneous achievement of high piezoresistive sensitivity and large strain ranges for CPNCs currently presents a great challenge, possibly extending the applications of CPNCs with self-diagnosis capabilities to many structural health monitoring (SHM) systems. Here, we report a facile strategy for fabricating highly piezoresistive and tough poly (vinylidene fluoride) (PVDF) based CPNCs by tuning the interactions between the polymer matrix and multi-walled carbon nanotubes (CNT) using an ionic liquid (IL) as an interface linker/modifier...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28079359/pristine-graphene-electrode-in-hydrogen-evolution-reaction
#16
Aozhen Xie, Ningning Xuan, Kun Ba, Zhengzong Sun
Graphene, the sp2 carbonaceous two dimensional (2D) material, is gaining more attentions in recent electrochemical studies. However, this atomic thick electrode usually suffers with surface contamination and poor electrochemical endurance. To overcome the drawbacks, we developed a PMMA-assisted, flipped transfer method to fabricate the graphene electrode with pristine surface and prolonged lifetime in hydrogen evolution reaction (HER). The HER performances of the single-layer graphene (SLG) were evaluated on various insulating and conductive substrates, including SiO2, polymers, SLG, highly oriented pyrolytic graphite (HOPG), and copper...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28075599/enhancing-cation-diffusion-and-suppressing-anion-diffusion-via-lewis-acidic-polymer-electrolytes
#17
Brett M Savoie, Michael A Webb, Thomas F Miller
Solid polymer electrolytes (SPE) have the potential to increase both the energy density and stability of lithium-based batteries, but low Li+ conductivity remains a barrier to technological viability. SPEs are designed to maximize Li+ diffusivity relative to the anion, while maintaining sufficient salt solubility. It is thus remarkable that polyethylene oxide (PEO), the most widely used SPE, exhibits Li+ diffusivity that is an order of magnitude smaller than that of typical counter-ions at moderate salt concentrations...
January 11, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28071835/macromolecular-design-strategies-for-preventing-active-material-crossover-in-non-aqueous-all-organic-redox-flow-batteries
#18
Sean E Doris, Ashleigh L Ward, Artem Baskin, Peter D Frischmann, Nagarjuna Gavvalapalli, Etienne Chénard, Christo S Sevov, David Prendergast, Jeffrey S Moore, Brett A Helms
Intermittent energy sources, including solar and wind, require scalable, low-cost, multi-hour energy storage solutions in order to be effectively incorporated into the grid. All-Organic non-aqueous redox-flow batteries offer a solution, but suffer from rapid capacity fade and low Coulombic efficiency due to the high permeability of redox-active species across the battery's membrane. Here we show that active-species crossover is arrested by scaling the membrane's pore size to molecular dimensions and in turn increasing the size of the active material above the membrane's pore-size exclusion limit...
January 10, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28069168/advances-in-organic-polymer-based-monolithic-column-technology-for-high-resolution-liquid-chromatography-mass-spectrometry-profiling-of-antibodies-intact-proteins-oligonucleotides-and-peptides
#19
REVIEW
Sebastiaan Eeltink, Sam Wouters, José Luís Dores-Sousa, Frantisek Svec
This review focuses on the preparation of organic polymer-based monolithic stationary phases and their application in the separation of biomolecules, including antibodies, intact proteins and protein isoforms, oligonucleotides, and protein digests. Column and material properties, and the optimization of the macropore structure towards kinetic performance are also discussed. State-of-the-art liquid chromatography-mass spectrometry biomolecule separations are reviewed and practical aspects such as ion-pairing agent selection and carryover are presented...
January 4, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28068769/high-resolution-coarse-grained-model-of-hydrated-anion-exchange-membranes-that-accounts-for-hydrophobic-and-ionic-interactions-through-short-ranged-potentials
#20
Jibao Lu, Liam C Jacobson, Yamila A Perez Sirkin, Valeria Molinero
Molecular simulations provide a versatile tool to study the structure, anion conductivity, and stability of anion-exchange membrane (AEM) materials and can provide a fundamental understanding of the relation between structure and property of membranes that is key for their use in fuel cells and other applications. The quest for large spatial and temporal scales required to model the multiscale structure and transport processes in the polymer electrolyte membranes, however, cannot be met with fully atomistic models, and the available coarse-grained (CG) models suffer from several challenges associated with their low-resolution...
January 10, 2017: Journal of Chemical Theory and Computation
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