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https://www.readbyqxmd.com/read/28527339/selective-removal-of-toxic-cr-vi-from-aqueous-solution-by-adsorption-combined-with-reduction-at-a-magnetic-nanocomposite-surface
#1
Nazia H Kera, Madhumita Bhaumik, Kriveshini Pillay, Suprakas Sinha Ray, Arjun Maity
The adsorption of toxic hexavalent chromium (Cr(VI)) and its reduction to trivalent chromium (Cr(III)) are important processes for the treatment of industrial wastewater. Conducting polymers can adsorb and reduce Cr(VI) to less toxic Cr(III) but have low adsorption capacities due to agglomeration of particles and are difficult to separate from treated water. In this study, magnetic polypyrrole (PPy)-polyaniline (PANI)/iron oxide (Fe3O4) nanocomposite was synthesized for the selective removal of Cr(VI) in aqueous solution...
May 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28526863/potential-of-pedot-pss-as-a-hole-selective-front-contact-for-silicon-heterojunction-solar-cells
#2
Sara Jäckle, Martin Liebhaber, Clemens Gersmann, Mathias Mews, Klaus Jäger, Silke Christiansen, Klaus Lips
We show that the highly conductive polymer poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) can successfully be applied as a hole selective front contact in silicon heterojunction (SHJ) solar cells. In combination with a superior electron selective heterojunction back contact based on amorphous silicon (a-Si), mono-crystalline n-type silicon (c-Si) solar cells reach power conversion efficiencies up to 14.8% and high open-circuit voltages exceeding 660 mV. Since in the PEDOT:PSS/c-Si/a-Si solar cell the inferior hybrid junction is determining the electrical device performance we are capable of assessing the recombination velocity (v I ) at the PEDOT:PSS/c-Si interface...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28525676/dynamic-mechanical-analysis-of-carbon-nanotube-reinforced-nanocomposites
#3
Shiuh-Chuan Her, Kuan-Yu Lin
BACKGROUND: To predict the mechanical properties of multiwalled carbon nanotube (MWCNT)-reinforced polymers, it is necessary to understand the role of the nanotube-polymer interface with regard to load transfer and the formation of the interphase region. The main objective of this study was to explore and attempt to clarify the reinforcement mechanisms of MWCNTs in epoxy matrix. METHODS: Nanocomposites were fabricated by adding different amounts of MWCNTs to epoxy resin...
May 18, 2017: Journal of Applied Biomaterials & Functional Materials
https://www.readbyqxmd.com/read/28523914/polymerizable-supramolecular-approach-to-highly-conductive-pedot-pss-patterns
#4
Taegeun Kim, Suryong Ha, Hyosung Choi, Kyungchan Uh, Umesha Kundapur, Sumin Park, Chan Woo Lee, Sang-Hwa Lee, Jaeyong Kim, Jong-Man Kim
Owing to its high conductivity, solution processability, mechanical flexibility and transparency, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been extensively explored for use in functional devices including solar cells, sensors, light emitting diodes and supercapacitors. The ability to fabricate patterned PEDOT:PSS on a solid substrate is of significant importance in order to develop practical applications of this conducting polymer. Herein we describe a new approach to obtain PEDOT:PSS patterns that is based on a polymerizable supramolecular concept...
May 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28522410/a-global-human-health-risk-assessment-for-octamethylcyclotetrasiloxane-d4
#5
Robinan Gentry, Allison Franzen, Cynthia Van Landingham, Tracy Greene, Kathy Plotzke
Octamethylcyclotetrasiloxane (D4) is a low-molecular-weight volatile cyclic siloxane, primarily used as an intermediate in the production of some widely-used industrial and consumer silicone based polymers and may be present as a component in a variety of consumer products. A global "harmonized" risk assessment was conducted to meet requirements for substance-specific risk assessments conducted by regulatory agencies such as USEPA's Integrated Risk Information System (IRIS), Health Canada's Chemical Management Program (CMP) and various independent scientific committees of the European Commission (e...
May 15, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/28520409/feco-anchored-reduced-graphene-oxide-framework-based-soft-composites-containing-carbon-nanotubes-as-highly-efficient-microwave-absorbers-with-excellent-heat-dissipation-ability
#6
Injamamul Arief, Sourav Biswas, Suryasarathi Bose
Conducting polymer composites containing ferromagnetic grafted-graphene derivatives are already appreciated for their lightweight, flexibility and cost effectiveness in terms of microwave absorption. To further leverage the said properties of this wonder material, we propose a highly efficient replacement by blending conducting multi-wall carbon nanotube (MWCNT) and FeCo anchored covalent cross-linked reduced graphene oxide (rGO) with polyvinylidene fluoride (PVDF). Interconnected conducting network of MWCNTs introduces higher electrical conductivity in the blend which is essential for microwave absorption...
May 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28520233/nanojunction-polymer-photoelectrode-for-efficient-charge-transport-and-separation
#7
Qiushi Ruan, Wenjun Luo, Jijia Xie, Yiou Wang, Xu Liu, Zhiming Bai, Claire J Carmalt, Junwang Tang
A novel nanojunction archiecture of metal-free photoanode, composed of B-doped carbon nitride nanolayer and bulk carbon nitride has been fabricated by a one-step construction approach. This type of nanojunction overcomes a few intrinsic drawbacks of carbon nitride film, e.g. severe bulk charge recombination and slow charge transfer. For the optium sample, the top layer of the nanojunction has a depth of ca. 100 nm and the bottom layer is ca. 900 nm. The nanojunction photoanode results into a 10 fold higher photocurrent than bulk graphitic carbon nitride and an extremely high incident photon-to-current efficiency (IPCE) of ca...
May 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28516893/design-of-electrohydrodynamic-sprayed-polyethylene-glycol-hydrogel-microspheres-for-cell-encapsulation
#8
Anisa S Qayyum, Era Jain, Grant Kolar, Yonghyun Kim, Scott A Sell, Silviya P Zustiak
Electrohydrodynamic spraying (EHS) has recently gained popularity for microencapsulation of cells for applications in cell delivery and tissue engineering. Some of the polymers compatible with EHS are alginate, chitosan, and other similar natural polymers, which are subject to ionotropic or physical gelation. It is desirable to further extend the use of the EHS technique beyond such polymers for wider biofabrication applications. Here, building upon our previous work of making PEG microspheres via EHS, we utilized the principles of EHS to fabricate cell-laden polyethylene glycol (PEG) hydrogel microspheres...
May 18, 2017: Biofabrication
https://www.readbyqxmd.com/read/28516507/an-all-plastic-field-effect-nanofluidic-diode-gated-by-a-conducting-polymer-layer
#9
Gonzalo Pérez-Mitta, Waldemar A Marmisollé, Christina Trautmann, María Eugenia Toimil-Molares, Omar Azzaroni
The design of an all-plastic field-effect nanofluidic diode is proposed, which allows precise nanofluidic operations to be performed. The fabrication process involves the chemical synthesis of a conductive poly(3,4-ethylenedioxythiophene) (PEDOT) layer over a previously fabricated solid-state nanopore. The conducting layer acts as gate electrode by changing its electrochemical state upon the application of different voltages, ultimately changing the surface charge of the nanopore. A PEDOT-based nanopore is able to discriminate the ionic species passing through it in a quantitative and qualitative manner, as PEDOT nanopores display three well-defined voltage-controlled transport regimes: cation-rectifying, non-rectifying, and anion rectifying regimes...
May 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28513994/ultrahigh-conductivity-polymer-hydrogels-with-arbitrary-structures
#10
Bowen Yao, Haiyan Wang, Qinqin Zhou, Mingmao Wu, Miao Zhang, Chun Li, Gaoquan Shi
A poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) hydrogel is prepared by thermal treatment of a commercial PEDOT:PSS (PH1000) suspension in 0.1 mol L(-1) sulfuric acid followed by partially removing its PSS component with concentrated sulfuric acid. This hydrogel has a low solid content of 4% (by weight) and an extremely high conductivity of 880 S m(-1) . It can be fabricated into different shapes such as films, fibers, and columns with arbitrary sizes for practical applications. A highly conductive and mechanically strong porous fiber is prepared by drying PEDOT:PSS hydrogel fiber to fabricate a current-collector-free solid-state flexible supercapacitor...
May 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28513679/a-novel-synthesis-of-an-fe-3-fe-2-layered-double-hydroxide-green-rust-via-controlled-electron-transfer-with-a-conducting-polymer
#11
Min-Sung Kim, Tae-Hyun Kim, Young Sun Seo, Jae-Min Oh, Jin Kuen Park
This report examines the influence of a conducting polymer on the crystal growth of labile green rust (GR) through hybridization with polypyrrole. All hybrids used in this study were prepared via one-pot co-precipitation at neutral pH, with specific stoichiometric ratios among all chemical species. The role of the conducting polymer and the effective stoichiometric ratio were demonstrated to facilitate the crystal growth of GR.
May 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28508925/using-maldi-tof-ms-imaging-and-lc-hrms-for-the-investigation-of-the-degradation-of-polycaprolactone-diol-exposed-to-different-wastewater-treatments
#12
Daniel Rivas, Bozo Zonja, Peter Eichhorn, Antoni Ginebreda, Sandra Pérez, Damià Barceló
Polymers are used in high amounts in a wide range of applications from biomedicine to industry. Because of the growing awareness of the increasing amounts of plastic wastes in the aquatic environment during recent years, the evaluation of their biodegradability deserves special attention. In the past, most efforts were dedicated to studying the biodegradation of polyesters in soil and compost, while very little research has been conducted on their fate in wastewater. Here, we assessed the ability of bacterial communities residing in the aerobic and denitrification tank from a wastewater treatment plant (WWTP) to degrade the polymeric ester polycaprolactone diol (PCLD; average molecular weight of 1250 Da)...
May 16, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28508898/dicyanoaurate-based-heterobimetallic-uranyl-coordination-polymers
#13
Matthew L Brown, Jeffrey S Ovens, Daniel B Leznoff
The first series of uranyl ([UO2](2+))-dicyanoaurate coordination polymers and molecular complexes has been synthesized. Reactions of [A][Au(CN)2] (A = [(n)Bu4N](+) or [(Ph3P)2N](+) ([PPN])) and uranyl nitrate in alcoholic solvents in ambient light led to [A]2[(UO2)2(μ-η(2):η(2)-O2)(NO3)2(μ-Au(CN)2)2], which incorporates peroxo ligands into a one-dimensional ladder topology with alternating aurophilic and peroxo rungs. Conducting the reaction with non-alcoholic solvents formed two polymorphs of a one-dimensional chain, [PPN][UO2(NO3)2Au(CN)2], from acetone, and a molecular analogue, [PPN]2[UO2(NO3)2(Au(CN)2)2], from acetonitrile, none of which exhibited aurophilic interactions...
May 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28508474/interrogation-of-a-ps1-based-photocathode-by-means-of-scanning-photoelectrochemical-microscopy
#14
Fangyuan Zhao, Nicolas Plumeré, Marc M Nowaczyk, Adrian Ruff, Wolfgang Schuhmann, Felipe Conzuelo
In the development of photosystem-based energy conversion devices, the in-depth understanding of electron transfer processes involved in photocurrent generation and possible charge recombination is essential as a basis for the development of photo-bioelectrochemical architectures with increased efficiency. The evaluation of a bio-photocathode based on photosystem 1 (PS1) integrated within a redox hydrogel by means of scanning photoelectrochemical microscopy (SPECM) is reported. The redox polymer acts as a conducting matrix for the transfer of electrons from the electrode surface to the photo-oxidized P700 centers within PS1, while methyl viologen is used as charge carrier for the collection of electrons at the reduced FB site of PS1...
May 16, 2017: Small
https://www.readbyqxmd.com/read/28507700/stepwise-observation-and-quantification-and-mixed-matrix-membrane-separation-of-co2-within-a-hydroxy-decorated-porous-host
#15
Christopher G Morris, Nicholas M Jacques, Harry G W Godfrey, Tamoghna Mitra, Detlev Fritsch, Zhenzhong Lu, Claire A Murray, Jonathan Potter, Tom M Cobb, Fajin Yuan, Chiu C Tang, Sihai Yang, Martin Schröder
The identification of preferred binding domains within a host structure provides important insights into the function of materials. State-of-the-art reports mostly focus on crystallographic studies of empty and single component guest-loaded host structures to determine the location of guests. However, measurements of material properties (e.g., adsorption and breakthrough of substrates) are usually performed for a wide range of pressure (guest coverage) and/or using multi-component gas mixtures. Here we report the development of a multifunctional gas dosing system for use in X-ray powder diffraction studies on Beamline I11 at Diamond Light Source...
April 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28503398/synthesis-of-coaxial-nanotubes-of-polyaniline-and-poly-hydroxyethyl-methacrylate-by-oxidative-initiated-chemical-vapor-deposition
#16
Alper Balkan, Efe Armagan, Gozde Ozaydin Ince
Vapor-phase synthesis techniques of polymeric nanostructures offer unique advantages over conventional, solution-based techniques because of their solventless nature. In this work, we report the fabrication of coaxial polymer nanotubes using two different chemical vapor deposition methods. The fabrication process involves the deposition of an outer layer of the conductive polyaniline (PANI) by oxidative chemical vapor deposition, followed by the deposition of the inner layer of poly(2-hydroxyethyl methacrylate) (pHEMA) hydrogel by initiated chemical vapor deposition...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28500935/enhanced-pseudocapacitive-performance-of-electroactive-p-type-conductive-polymer-in-the-presence-of-1-octadecyl-3-methylimidazolium-bromide
#17
A Ehsani, E Kowsari, M Dashti Najafi, R Safari, H Mohammad Shiri
In present work, for improving the electrochemical performance of conductive polymer, POAP/1-octadecyl-3-methylimidazolium Bromide ([OMD]Br) composite films have been fabricated by POAP electropolymerization in the presence of [OMD]Br as active electrodes for electrochemical supercapacitors. Different electrochemical methods including galvanostatic charge discharge experiments, cyclic voltammetry and electrochemical impedance spectroscopy have been applied to study the system performance. Analyses of DFT results show that the atomic-scale electronic properties are generally depend on the bonding and electronic molecular structures (and thus their variation with the external bias in real nano-electrochemical circuits)...
May 4, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28499879/developing-a-flexible-pediatric-dosage-form-for-antiretroviral-therapy-a-fast-dissolving-tablet
#18
Manjari Lal, Manshun Lai, Marcus Estrada, Changcheng Zhu
Current presentations of the anti-HIV drugs lopinavir and ritonavir make appropriate dosing for children difficult. We conducted a feasibility study to develop a formulation for these drugs with child-safe excipients in a flexible dosage form for children across the pediatric age spectrum. The freeze-drying-in-blister approach was used to produce fast-dissolving tablets (FDTs), as these can be dispersed in fluids for easy administration, even to infants, and appropriate portions of the dispersion can be given for different ages/weights...
May 9, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28499598/simultaneous-electromembrane-extraction-of-cationic-and-anionic-herbicides-across-hollow-polymer-inclusion-membranes-with-a-bubbleless-electrode
#19
Nor Akma Mamat, Hong Heng See
A new electric-field driven extraction approach based on the integration of a bubbleless electrode into the electromembrane extraction (EME) across hollow polymer inclusion membranes (HPIMs) was demonstrated for the first time. The bubbleless electrode was prepared based on an in-situ synthesised polyacrylamide within a fused silica capillary. The electrode functions as a salt bridge, which conducts the electrical current between the acceptor phase in the lumen of the HPIM and the acceptor solution in the reservoir connected to a high voltage supply through a platinum electrode...
May 3, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28499092/determining-the-conduction-band-edge-potential-of-solar-cell-relevant-nb2o5-fabricated-by-atomic-layer-deposition
#20
William L Hoffeditz, Michael J Pellin, Omar K Farha, Joseph T Hupp
Often key to boosting photovoltages in photoelectrochemical and related solar-energy-conversion devices is the preferential slowing of rates of charge recombination - especially recombination at semiconductor/solution, semiconductor/polymer, or semiconductor/perovskite interfaces. In devices featuring TiO2 as the semiconducting component, a common approach to slowing recombination is to install an ultrathin metal-oxide barrier layer or trap-passivating layer atop the semiconductor, with the needed layer often being formed via atomic layer deposition (ALD)...
May 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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