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https://www.readbyqxmd.com/read/28629075/fabrication-of-chitosan-au-tio2-nanotube-based-dry-electrodes-for-electroencephalography-recording
#1
Yanjuan Song, Penghai Li, Mingji Li, Hongji Li, Cuiping Li, Dazhi Sun, Baohe Yang
In this paper, we describe a method for fabricating dry electrodes for use in recording electroencephalograms (EEGs), which are based on the use of chitosan (Ch), gold (Au) particles, and titanium dioxide (TiO2) nanotube arrays deposited on titanium (Ti) thin sheets. The samples were characterized by scanning electron microscopy, X-ray diffraction, electrochemical impedance spectroscopy, and EEG signal collection. The TiO2 nanotube arrays were grown on the Ti thin sheet by an electrochemical anodic oxidation method...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28629024/electrospun-silk-fibroin-scaffolds-coated-with-reduced-graphene-promote-neurite-outgrowth-of-pc-12-cells-under-electrical-stimulation
#2
Salvador Aznar-Cervantes, Ana Pagán, Jose G Martínez, Antonia Bernabeu-Esclapez, Toribio F Otero, Luis Meseguer-Olmo, Juan I Paredes, Jose L Cenis
Novel approaches to neural research require biocompatible materials capable to act as electrode structures or scaffolds for tissue engineering in order to stimulate or restore the functionality of damaged tissues. This work offers promising results that indicate the potential use of electrospun silk fibroin (SF) scaffolds coated with reduced graphene oxide (rGO) in this sense. The coated material becomes conductor and electroactive. A complete characterisation of SF/rGO scaffolds is provided in terms of electrochemistry, mechanical behaviour and chemical conformation of fibroin...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28628267/opto-electrochemical-in-situ-monitoring-of-cathodic-single-cobalt-nanoparticle-formation
#3
Vitor Brasiliense, Jan Clausmeyer, Alice L Dauphin, Jean-Marc Noël, Pascal Berto, Gilles Tessier, Wolfgang Schuhmann, Frederic Kanoufi
Single particle electrochemistry at a nanoelectrode is explored by dark-field optical microscopy. The analysis of the scattered light allows in situ dynamic monitoring of the electrodeposition of single cobalt nanoparticles down to a radius of 65 nm. Larger sub-micrometer particles are directly sized optically by edges super-localization and the scattered light contains complementary chemical information concerning the particle redox chemistry. This opto-electrochemical approach is used to derive mechanistic insights about electrocatalysis which are not accessible from single particle electrochemistry...
June 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28627135/in-situ-electrochemistry-of-rechargeable-battery-materials-status-report-and-perspectives
#4
REVIEW
Yijun Yang, Xizheng Liu, Zhonghua Dai, Fangli Yuan, Yoshio Bando, Dmitri Golberg, Xi Wang
The development of rechargeable batteries with high performance is considered to be a feasible way to satisfy the increasing needs of electric vehicles and portable devices. It is of vital importance to design electrodes with high electrochemical performance and to understand the nature of the electrode/electrolyte interfaces during battery operation, which allows a direct observation of the complicated chemical and physical processes within the electrodes and electrolyte, and thus provides real-time information for further design and optimization of the battery performance...
June 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28624997/expression-and-purification-of-cytochrome-p450-55b1-from-chlamydomonas-reinhardtii-and-its-application-in-nitric-oxide-biosensing
#5
Bin Gong, Xiaosheng Liang, Yong Li, Qian Xiao, Panchun Yang, Yunhua Wu
Cytochrome P450 55B1 from Chlamydomonas reinhardtii is reported to function as a nitric oxide reductase (NOR). Here, we expressed the cytochrome P450 55B1 gene with an HIS-tag in E scherichia coli using a pET28a vector. The native protein was produced at a level of 1.59 μmol/g of total protein, with approximately 85% of the P450 being soluble. The CYP55B1 protein was characterized spectrally and purified by a HIS-trap column. This procedure allowed recovery of 45% of the expressed protein and CYP55B1 with a specific content of 0...
June 17, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28621376/current-and-future-directions-in-electron-transfer-chemistry-of-graphene
#6
REVIEW
Amir Kaplan, Zhe Yuan, Jesse D Benck, Ananth Govind Rajan, Ximo S Chu, Qing Hua Wang, Michael S Strano
The participation of graphene in electron transfer chemistry, where an electron is transferred between graphene and other species, encompasses many important processes that have shown versatility and potential for use in important applications. Examples of these processes range from covalent functionalization of graphene to modify its properties and incorporate different functional groups, to electrochemical reactions and selective etching. In this paper, we review recent developments in these areas of the electron transfer chemistry of graphene...
June 16, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28621375/roles-of-phenol-groups-and-auxiliary-ligand-of-copper-ii-complexes-with-tetradentate-ligands-in-the-aerobic-oxidation-of-benzyl-alcohol
#7
Guangli Zhan, Wei Zhong, Zhenhong Wei, Zhenzhen Liu, Xiaoming Liu
Herein, six copper(ii) complexes with multidentate ligands, [Cu(HL1)(OAc)(HOAc)] (1), [Cu(HL2)(OAc)] (2), [Cu(HL3)(OAc)] (3), [CuL4(OAc)] (4), [Cu(HL2)Cl] (5), and [Cu(HL3)Cl] (6) {H2L1 = [bis(3-tert-butyl-2-hydroxybenzyl)](2-pyridylmethyl)amine, H2L2 = [(3-tert-butyl-2-hydoxybenzyl)(3-trifluoromethyl-2-hydroxybenzyl) (2-pyridylmethyl)]amine, H2L3 = [bis(3-trifluoromethyl-2-hydroxybenzyl)] (2-pyridylmethyl)amine, and HL4 = [bis(2-pyridylmethyl)] (3-tert-butyl-2-hydroxybenzyl)amine}, are reported. The complexes were characterized by UV-vis spectroscopy, high-resolution mass spectrometry, X-ray single-crystal diffraction analysis and electrochemistry...
June 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28620938/anisotropic-metal-deposition-on-tio2-particles-by-electric-field-induced-charge-separation
#8
Supakit Tiewcharoen, Chompunuch Warakulwit, Veronique Lapeyre, Patrick Garrigue, Lucas Fourier, Catherine Ellisalde, Sonia Buffière, Philippe Legros, Marion Gayot, Jumras Limtrakul, Alexander Kuhn
Deposition of metals on TiO2 semiconductor particles (M-TiO2) results in hybrid Janus objects combining the interesting properties of both materials. One of the techniques that have been proposed to generate Janus particles is bipolar electrochemistry (BPE). The concept can be applied in a straightforward way for the site selective modification of conducting particles, but is less obvious to use for semiconductors. In this work we report the bulk synthesis of anisotropic M-TiO2 particles based on the synergy of BPE and photochemistry, allowing to overcome intrinsic limitations when they are used separately...
June 16, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28619651/structure-and-electrochemistry-of-proteins-harboring-iron-sulfur-clusters-of-different-nuclearities-part-i-4fe-4s-2fe-2s-iron-sulfur-proteins
#9
REVIEW
Piero Zanello
In a recent series of review papers we have updated structure/electrochemistry of metalloproteins harboring single types of iron-sulfur clusters, namely {Fe(Cys)4}, {[Fe2S2](Cys)4}, {[Fe2S2](Cys)3(X)} (X = Asp, Arg, His), {[Fe2S2](Cys)2(His)2}, {[Fe3S4](Cys)3}, {[Fe4S4](Cys)4} and {[Fe4S4](S(γ)Cys)3(nonthiolate ligand)} cores, and their synthetic analogs. We now face with iron-sulfur proteins harboring iron-sulfur centres of different nuclearities. In this picture we start with proteins containing [4Fe-4S]+[2Fe-2S] clusters...
June 12, 2017: Journal of Structural Biology
https://www.readbyqxmd.com/read/28617586/research-progress-towards-the-practical-applications-of-lithium-sulfur-li-s-batteries
#10
Joshua Lochala, Dianying Liu, Bingbin Wu, Cynthia Robinson, Jie Xiao
The renaissance of Li-S battery technology is witnessed by the intensive R&D efforts in recent years. Although the theoretical capacity and energy of a Li-S battery is theoretically very high, the projected usable energy is expected to be no more than twice that of state-of-art Li-ion batteries, or 500 Wh/kg. The recent "sulfur fever" has certainly gathered new knowledge on sulfur chemistry and electrochemistry, electrolytes, lithium metal and their interactions in this "new" system; however, a real advance towards a practical Li-S battery is still missing...
June 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28613896/catalytic-n2-reduction-into-silylamines-and-thermodynamics-of-n2-binding-at-square-planar-fe
#11
Demyan E Prokopchuk, Eric S Wiedner, Eric D Walter, Codrina V Popescu, Nicholas A Piro, W Scott Kassel, R Morris Bullock, Michael T Mock
The geometric constraints imposed by a tetradentate P4N2 ligand play an essential role in stabilizing square planar Fe complexes with changes in metal oxidation state. A combination of high-pressure electrochemistry and variable temperature UV-vis spectroscopy were used to obtain thermodynamic measurements of N2 binding. In addition, X-ray crystallography, 57Fe Mössbauer spectroscopy, and EPR spectroscopy were used to fully characterize these new compounds. Analysis of Fe0, FeI, and FeII complexes reveals that the free energy of N2 binding across three oxidation states spans more than 37 kcal mol-1...
June 14, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28610424/single-molecule-chemistry-with-surface-and-tip-enhanced-raman-spectroscopy
#12
Alyssa B Zrimsek, Naihao Chiang, Michael Mattei, Stephanie Zaleski, Michael O McAnally, Craig T Chapman, Anne-Isabelle Henry, George C Schatz, Richard P Van Duyne
Single-molecule (SM) surface-enhanced Raman spectroscopy (SERS) and tip-enhanced Raman spectroscopy (TERS) have emerged as analytical techniques for characterizing molecular systems in nanoscale environments. SERS and TERS use plasmonically enhanced Raman scattering to characterize the chemical information on single molecules. Additionally, TERS can image single molecules with subnanometer spatial resolution. In this review, we cover the development and history of SERS and TERS, including the concept of SERS hot spots and the plasmonic nanostructures necessary for SM detection, the past and current methodologies for verifying SMSERS, and investigations into understanding the signal heterogeneities observed with SMSERS...
June 14, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28608820/a-multi-parametric-device-with-innovative-solid-electrodes-for-long-term-monitoring-of-ph-redox-potential-and-conductivity-in-a-nuclear-waste-repository
#13
Jordan Daoudi, Stephanie Betelu, Theodore Tzedakis, Johan Bertrand, Ioannis Ignatiadis
We present an innovative electrochemical probe for the monitoring of pH, redox potential and conductivity in near-field rocks of deep geological radioactive waste repositories. The probe is composed of a monocrystalline antimony electrode for pH sensing, four AgCl/Ag-based reference or Cl(-) selective electrodes, one Ag₂S/Ag-based reference or S(2-) selective electrode, as well as four platinum electrodes, a gold electrode and a glassy-carbon electrode for redox potential measurements. Galvanostatic electrochemistry impedance spectroscopy using AgCl/Ag-based and platinum electrodes measure conductivity...
June 13, 2017: Sensors
https://www.readbyqxmd.com/read/28607991/electrochemistry-of-single-droplets-of-inverse-water-in-oil-emulsions
#14
Haozhi Zhang, Lior Sepunaru, Stanislav V Sokolov, Eduardo Laborda, Christopher Batchelor-McAuley, Richard G Compton
We demonstrate the feasibility of electrochemically detecting individual water droplets dispersed in an oil phase (inverse emulsions) via the use of a redox probe confined in the droplet phase. The water droplets were tagged with potassium ferrocyanide, and were injected into an electrolyte cyclohexene/dichloromethane oil solution. Via simple cyclic voltammetry scans it is shown that single water droplets from a water-in-oil emulsion can be detected provided that rapid anion transfer from the oil to the water phase maintains electro-neutrality in the droplet...
June 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28604860/understanding-iridium-oxide-nanoparticle-surface-sites-by-their-interaction-with-catechol
#15
Daniel Finkelstein-Shapiro, Maxime Fournier, Dalvin D Méndez-Hernández, Chengchen Guo, Monica Calatayud, Thomas A Moore, Ana L Moore, Devens Gust, Jeffery L Yarger
Iridium oxide (IrOx) is one of the best water splitting electrocatalysts, but its active site details are not well known. As with all heterogeneous catalysts, a strategy for counting the number of active sites is not clear, and understanding their nature and structure is remarkably difficult. In this work, we performed a combined study using optical spectroscopy, magnetic resonance and electrochemistry to characterize the interaction of IrOx nanoparticles (NPs) with a probe molecule, catechol. The catalyst is heterogeneous given that the substrate is in a different phase, but behaves as a homogeneous catalyst from the point of view of electrochemistry since it remains in colloidal suspension...
June 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28600940/the-synthesis-of-novel-linipo4-core-and-co3o4-coo-shell-materials-by-combining-them-with-hard-template-and-solvothermal-routes
#16
Ahmet Örnek
Pure CoO and Co3O4 surface-modified LiNiPO4 nanoscale powders are successfully synthesized for the first time by newly elaborated hard-template and solvothermal methods. Using this extraordinary technique, LiNiPO4 particles are coated with a thin CoO or Co3O4 layer with a perfect core-shell morphology. The technique's positive contribution to electrochemistry is investigated in detail. The HR-TEM analysis proves that it possible to achieve a continuous surface coverage of about 5nm, a result that contributes towards solving the chronic electrochemical problems of high-voltage cathode material...
June 1, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28598607/electrochemistry-and-electrochemiluminescence-of-organometal-halide-perovskites-nanocrystals-in-aqueous-medium
#17
Xiao Tan, Bin Zhang, Guizheng Zou
The redox nature and electrochemiluminescence (ECL) of highly crystalized organometal halide perovskites CH3NH3PbBr3 nanocrystals (NCs) in aqueous medium were investigated for the first time. CH3NH3PbBr3 NCs could be electrochemically reduced to negtive charged states by injecting electrons onto the lowest unoccupied molecular orbitals and oxidized to positive chargrd states by removing electrons from the highest occupied molecular orbitals, the charge transfer between NCs of positive charged states and negative charged states could bring out ECL...
June 9, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28597932/low-cost-zeta-potentiometry-using-solute-gradients
#18
Sangwoo Shin, Jesse T Ault, Jie Feng, Patrick B Warren, Howard A Stone
The zeta potential is an electric potential in the Debye screening layer of an electrolyte, which represents a key physicochemical surface property in various fields ranging from electrochemistry to pharmaceuticals. Thus, characterizing the zeta potential is essential for many applications, but available measurement techniques are limited. Electrophoretic light scattering is typically used to measure the zeta potential of particles in suspension, whereas zeta potential measurements of a solid wall in solution rely on either streaming potential or electroosmotic mobility measurement techniques, both of which are expensive and sophisticated...
June 9, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28597651/in-operando-investigation-of-electrically-coupling-of-photosystem-1-and-photosystem-2-by-means-of-bipolar-electrochemistry
#19
Vera Essmann, Fangyuan Zhao, Volker Hartmann, Marc M Nowaczyk, Wolfgang Schuhmann, Felipe Conzuelo
Electrochemical communication between two photobioelectrochemical half-cells based on photosystem 1 and photo-system 2 is investigated in operando. The driving force for the electron transfer reactions is applied in a wireless mode using bipolar electrochemistry with the actual electrode potentials being self-regulated by the redox processes. Four parameters are assessed to understand the overall performance and elucidate the limiting reactions of the photobioe-lectrochemical cell. In addition to the potential differences for oxidation and reduction reactions, the current flowing between the half-cells as well as in situ collection of locally evolved O2 by photosystem 2 using a positioned SECM tip are evaluated...
June 9, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28597382/performance-and-microbial-community-dynamics-of-electricity-assisted-sequencing-batch-reactor-sbr-for-treatment-of-saline-petrochemical-wastewater
#20
Jiaxin Liu, Shengnan Shi, Xiangyu Ji, Bei Jiang, Lanlan Xue, Meidi Li, Liang Tan
High-salinity wastewater is often difficult to treat by common biological technologies due to salinity stress on the bacterial community. Electricity-assisted anaerobic technologies have significantly enhanced the treatment performance by alleviating the impact of salinity stress on the bacterial community, but electricity-assisted aerobic technologies have less been reported. Herein, a novel bio-electrochemistry system has been designed and operated in which a pair of stainless iron mesh-graphite plate electrodes were installed into a sequencing batch reactor (SBR, designated as S1) to strengthen the performance of saline petrochemical wastewater under aerobic conditions...
June 8, 2017: Environmental Science and Pollution Research International
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