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https://www.readbyqxmd.com/read/28212336/the-influence-of-anion-shape-on-the-electrical-double-layer-microstructure-and-capacitance-of-ionic-liquids-based-supercapacitors-by-molecular-simulations
#1
Ming Chen, Song Li, Guang Feng
Room-temperature ionic liquids (RTILs) are an emerging class of electrolytes for supercapacitors. In this work, we investigate the effects of different supercapacitor models and anion shape on the electrical double layers (EDLs) of two different RTILs: 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([Emim][Tf₂N]) and 1-ethyl-3-methylimidazolium 2-(cyano)pyrrolide ([Emim][CNPyr]) by molecular dynamics (MD) simulation. The EDL microstructure is represented by number densities of cations and anions, and the potential drop near neutral and charged electrodes reveal that the supercapacitor model with a single electrode has the same EDL structure as the model with two opposite electrodes...
February 16, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28212326/electrochemical-oxidation-of-l-selenomethionine-and-se-methylseleno-l-cysteine-at-a-thiol-compound-modified-gold-electrode-its-application-in-a-flow-through-voltammetric-sensor
#2
Lai-Hao Wang, Yu-Han Zhang
A flow-electrolytic cell that consists of a bare gold wire or of different thiol-compound-modified gold electrodes (such as 2,4-thiazolidinedione, 2-mercapto-5-thiazoline, 2-mercaptothiazoline, l-cysteine, thioglycolic acid) was designed to be used in a voltammetric detector to identify l-selenomethionine and Se-methylseleno-l-cysteine using high-performance liquid chromatography. Both l-selenomethionine and Se-methylseleno-l-cysteine are more efficiently electrochemically oxidized on a thiol/gold than on a bare gold electrode...
February 16, 2017: Sensors
https://www.readbyqxmd.com/read/28212003/tip2o7-and-expanded-graphite-nanocomposite-as-anode-material-for-aqueous-lithium-ion-batteries
#3
Yunping Wen, Long Chen, Ying Pang, Zhaowei Guo, Duan Bin, Yong-Gang Wang, Congxiao Wang, Yongyao Xia
This paper reports a facile sol-gel synthesis method to successfully prepare the TiP2O7/expanded graphite (EG) nanocomposite as an advanced anode material for aqueous lithium-ion batteries. The constructed TiP2O7 nanocomposite (50-100 nm) are in-situ encapsulated in the pore and layer structure of expanded graphite with good conductivity and high specific surface area. As a consequence, the resulting TiP2O7/EG electrode exhibits a reversible capacity of 66 mAh g-1 at 0.1 A g-1 with an appropriate potential of -0...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28211275/suppression-of-hydrogen-evolution-by-oxygen-reduction-in-nanoporous-electrocatalysts
#4
Ellen Benn, Bernard Gaskey, Jonah D Erlebacher
Electroreduction of small molecules in aqueous solution often competes with the hydrogen evolution reaction (HER), especially if the reaction is driven even moderately hard using a large overpotential. Here, the oxygen reduction reaction (ORR) was studied under proton diffusion-limited conditions in slightly acidic electrolytes - a model system to study the relative transport kinetics of protons and reactants to an electrocatalyst and the relationship between transport and catalytic performance. Using dealloyed nanoporous nickel-platinum (np-NiPt) electrodes, we find the hydrogen evolution reaction can be completely suppressed even at high overpotentials (-400 mV vs...
February 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28210984/effect-of-solution-ionic-strength-on-the-pka-of-the-nitroxide-ph-epr-probe-2-2-3-4-5-5-hexamethylimidazolidin-1-oxyl
#5
Kaleigh Margita, Maxim A Voinov, Alex I Smirnov
Spin probe and spin labeling Electron Paramagnetic Resonance methods are indispensable research tools for solving a wide range of bioanalytical problems-from measuring microviscosity and polarity of phase-separated liquids to oxygen concentrations in tissues. One of the emerging uses of spin probes are the studies of proton transfer-related and surface electrostatic phenomena. The latter Electron Paramagnetic Resonance methods rely on molecular probes containing an additional functionality capable of reversible ionization (protonation, in particular) in the immediate proximity to an Electron Paramagnetic Resonance-active reporter group, such as (N-O(•)) for nitroxides...
February 17, 2017: Cell Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28210501/perioperative-concerns-for-profound-metabolic-alkalosis-during-kidney-transplantation-a-case-report
#6
Jung Ju Choi, Yong Beom Kim, Hong Soon Kim, Kyung Cheon Lee, Youn Yi Jo
INTRODUCTION: Profound metabolic alkalosis is an uncommon consideration for the anesthetic management of kidney transplantation. Serum total carbon dioxide content and complex electrolyte abnormalities might be important diagnostic clues for the presence of metabolic alkalosis in the absence of arterial blood gas analysis. CASE PRESENTATION: A 34-year-old female visited Gachon University Gil Medical Center, Incheon, South Korea during year 2015. She experienced aggravated renal function due to chronic hypokalemia and severe hypochloremic metabolic alkalosis, induced by laxative abuse, and underwent ABO incompatible kidney transplantation...
November 2016: Iranian Red Crescent Medical Journal
https://www.readbyqxmd.com/read/28209539/chemically-deposited-nano-grain-composed-mos2-thin-films-for-supercapacitor-application
#7
R B Pujari, A C Lokhande, A R Shelke, J H Kim, C D Lokhande
Low temperature soft chemical synthesis approach is employed towards MoS2 thin film preparation on cost effective stainless steel substrate. 3-D semispherical nano-grain composed surface texture of MoS2 film is observed through FE-SEM technique. Electrochemical supercapacitor performance of MoS2 film is tested from cyclic voltammetry (CV) and galvanostatic charge discharge (GCD) techniques in 1M aqueous Na2SO4 electrolyte. Specific capacitance (Cs) of 180Fg(-1) with CV cycling stability of 82% for 1000 cycles is achieved...
November 9, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28209132/urinary-tract-infection-among-fistula-patients-admitted-at-hamlin-fistula-hospital-addis-ababa-ethiopia
#8
Matifan Dereje, Yimtubezinesh Woldeamanuel, Daneil Asrat, Fekade Ayenachew
BACKGROUND: Urinary Tract Infection (UTI) causes a serious health problem and affects millions of people worldwide. Patients with obstetric fistula usually suffer from incontinence of urine and stool, which can predispose them to frequent infections of the urinary tract. Therefore the aim of this study was to determine the etiologic agents, drug resistance pattern of the isolates and associated risk factor for urinary tract infection among fistula patients in Addis Ababa fistula hospital, Ethiopia...
February 16, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28209079/acid-base-disorders-after-orthotopic-bladder-replacement-comparison-of-an-ileal-neobladder-and-an-ileal-conduit
#9
AJin Cho, Seung Min Lee, Jung Woo Noh, Don Kyoung Choi, Yongseong Lee, Sung Tae Cho, Ki Kyung Kim, Young Goo Lee, Young Ki Lee
OBJECTIVES: For many years, creation of an orthotopic neobladder after cystectomy has been popular. In the present study, we measured the extent of metabolic acidosis in patients with ileal neobladders compared with ileal conduits and defined risk factors for development of metabolic acidosis. METHODS: We retrospectively studied 95 patients, who underwent radical cystectomy and urinary diversion to treat invasive bladder cancer from January 2001 to December 2014 at Hallym University Kangnam Sacred Heart Hospital, through investigation of acid-base balance, serum electrolyte levels and renal function one month and one year after operation...
November 2017: Renal Failure
https://www.readbyqxmd.com/read/28208307/quantitative-nonaqueous-capillary-electrophoresis-mass-spectrometry-method-for-determining-active-ingredients-in-plant-extracts
#10
Jianhui Cheng, Lingyu Wang, Weifen Liu, David D Y Chen
Nonaqueous capillary electrophoresis (NACE) is very well suited for online coupling with mass spectrometry due to the relatively high volatility and low surface tension of most organic solvents. Here we present a quantitative NACE-ESI-MS/MS method for separating and determining physcion, chrysophanol, and aloe-emodin in rhubarb. Dantron was used as an internal standard to ensure accuracy and reproducibility in quantitative analyses. Parameters including the pH, background electrolyte (BGE) composition, flow-through microvial chemical modifier solution composition, and modifier solution flow rate were carefully optimized...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28208305/predicting-electrophoretic-mobility-of-tryptic-peptides-for-high-throughput-cze-ms-analysis
#11
Oleg V Krokhin, Geoffrey Anderson, Vic Spicer, Liangliang Sun, Norman J Dovichi
A multiparametric sequence-specific model for predicting peptide electrophoretic mobility has been developed using large-scale bottom-up proteomic CE-MS data (5% (∼0.8M) acetic acid as background electrolyte). Peptide charge (Z) and size (molecular mass, M) are the two major factors determining electrophoretic mobility, in complete agreement with previous studies. The extended size of the data set (>4000 peptides) permits access to many sequence-specific factors that impact peptide mobility. The presence of acidic residues Asp and Glu near the peptide N-terminus is by far the most prominent among them...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28208271/cation-dependent-surface-charge-regulation-in-gated-nanofluidic-devices
#12
Marie Fuest, Kaushik K Rangharajan, Caitlin Boone, A T Conlisk, Shaurya Prakash
Surface charge governs nanoscale aqueous electrolyte transport, both in engineered analytical systems and in biological entities such as ion channels and ion pumps as a function of ion type and concentration. Embedded electrodes in a nanofluidic channel, isolated from the fluid in the channel by a dielectric layer, act as active, tunable gates to systematically modify local surface charge density at the interface between the nanochannel surface and the aqueous electrolyte solution, causing significant changes in measured nanochannel conductance...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28208264/scanning-electrochemical-microscopy-with-forced-convection-introduced-by-high-precision-stirring
#13
Christian Iffelsberger, Preety Vatsyayan, Frank-Michael Matysik
In the present report the well-known advantages of hydrodynamic mass transport in electrochemical systems are used in combination with scanning electrochemical microscopy (SECM). The hydrodynamic SECM system integrates a high-precision stirring device into the experimental setup. The well-defined stirring of the SECM electrolyte results in steady state diffusion layer characteristics in the vicinity of large substrate electrodes operated in chronoamperometric measuring mode. For a range of rotation frequencies of a rotating cylinder the thickness and the stability of the diffusion layer was studied by hydrodynamic SECM in the substrate generation/tip collection (SG/TC) as well as in the competition mode using ferrocene methanol as redox mediator...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28207993/comparison-of-jugular-and-transverse-facial-venous-sinus-blood-analytes-in-healthy-and-critically-ill-adult-horses
#14
Kara M Lascola, Karie Vander Werf, Stephanie Freese, Alison Morgera, David J Schaeffer, Pamela Wilkins
OBJECTIVE: To compare blood gas, electrolyte, and metabolic analysis results between blood obtained by jugular and transverse facial venous sinus (TFVS) venipuncture in healthy adult horses and sick adult horses presented for emergency evaluation. DESIGN: Prospective, experimental study, from June 2012 to October 2013. SETTING: Large animal university teaching hospital. ANIMALS: Ten healthy adult University-owned horses and 48 client-owned adult horses (≥2 years old) presenting to the large animal hospital emergency service for medical or surgical evaluation of systemic illness...
February 16, 2017: Journal of Veterinary Emergency and Critical Care
https://www.readbyqxmd.com/read/28207920/paper-based-microfluidic-system-for-tear-electrolyte-analysis
#15
Ali K Yetisen, Nan Jiang, Ali Tamayol, Guillermo U Ruiz-Esparza, Yu Shrike Zhang, Sofía Medina-Pando, Aditi Gupta, James S Wolffsohn, Haider Butt, Ali Khademhosseini, Seok-Hyun Yun
The analysis of tear constituents at point-of-care settings has a potential for early diagnosis of ocular disorders such as dry eye disease, low-cost screening, and surveillance of at-risk subjects. However, current minimally-invasive rapid tear analysis systems for point-of-care settings have been limited to assessment of osmolarity or inflammatory markers and cannot differentiate between dry eye subclassifications. Here, we demonstrate a portable microfluidic system that allows quantitative analysis of electrolytes in the tear fluid that is suited for point-of-care settings...
February 16, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28206743/electrodeposited-na2vox-fe-cn-6-films-as-a-cathode-material-for-aqueous-na-ion-batteries
#16
Bianca Paulitsch, Jeongsik Yun, Aliaksandr S Bandarenka
The so-called Prussian Blue Analogues (PBAs) are spotlighted as promising cathode materials for aqueous Na-ion batteries regarding their good performance for the application in future large scale energy storage systems. In this work, we demonstrate that one of the PBA representatives, namely Na2VOx[Fe(CN)6] thin films (VHCFs), is a promising cathode material for aqueous Na-ion batteries with very positive intercalation/de-intercalation potentials, which might likely designate a new benchmark in the field. In order to maximize the material utilization, we have formed VHCF thin films on model current collectors from aqueous solutions...
February 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28205588/hypoxia-induced-angiotensin-ii-by-the-lactate-chymase-dependent-mechanism-mediates-radioresistance-of-hypoxic-tumor-cells
#17
Guozhu Xie, Ying Liu, Qiwei Yao, Rong Zheng, Lanfang Zhang, Jie Lin, Zhaoze Guo, Shasha Du, Chen Ren, Quan Yuan, Yawei Yuan
The renin-angiotensin system (RAS) is a principal determinant of arterial blood pressure and fluid and electrolyte balance. RAS component dysregulation was recently found in some malignancies and correlated with poor patient outcomes. However, the exact mechanism of local RAS activation in tumors is still unclear. Here, we find that the local angiotensin II predominantly exists in the hypoxic regions of tumor formed by nasopharyngeal carcinoma CNE2 cells and breast cancer MDA-MB-231 cells, where these tumor cells autocrinely produce angiotensin II by a chymase-dependent rather than an angiotensin converting enzyme-dependent mechanism...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28205444/revisiting-the-corrosion-of-aluminum-current-collector-in-lithium-ion-batteries
#18
Tianyuan Ma, Gui-Liang Xu, Yan Li, Li Wang, Xiangming He, Jianming Zheng, Jun Liu, Mark H Engelhard, Peter Zapol, Larry A Curtiss, Jacob Jorne, Khalil Amine, Zonghai Chen
The corrosion of aluminum current collectors and the oxidation of solvents at a relatively high potential have been widely investigated with an aim to stabilize the electrochemical performance of lithium-ion batteries using such components. The corrosion behavior of aluminum current collectors was revisited using a home-build high-precision electrochemical measurement system, and the impact of electrolyte components and the surface protection layer on aluminum foil was systematically studied. The electrochemical results showed that the corrosion of aluminum foil was triggered by the electrochemical oxidation of solvent molecules, like ethylene carbonate, at a relative high potential...
February 16, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28205438/generation-of-volatile-cadmium-and-zinc-species-based-on-solution-anode-glow-discharge-induced-plasma-electrochemical-processes
#19
Xing Liu, Zhifu Liu, Zhenli Zhu, Dong He, Siqi Yao, Hongtao Zheng, Shenghong Hu
In this study, a novel high efficiency vapor generation strategy was proposed based on solution anode glow discharge for the determination of Cd and Zn by atomic fluorescence spectrometry. In this approach, a glow discharge microplasma was acted as a gaseous cathode to initiate the plasma electrochemical vapor generation of Cd and Zn. Cadmium/Zinc ions could be converted into molecular species efficiently at the plasma-liquid interface from a supporting electrolyte (HCl, pH=3.2). It was found that the overall efficiency of the plasma electrochemical vapor generation (PEVG) system was much higher than the conventional electrochemical hydride generation (EcHG) and HCl-KBH4 system...
February 16, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28205121/effect-of-n-acetylcysteine-on-mortality-and-liver-transplantation-rate-in-non-acetaminophen-induced-acute-liver-failure-a-multicenter-study
#20
Samar K Darweesh, Mona F Ibrahim, Mahmoud A El-Tahawy
INTRODUCTION AND AIM: Previous studies and systematic reviews have not provided conclusive evidence on the effect of N-acetylcysteine (NAC) in non-acetaminophen-induced acute liver failure (NAI-ALF). We aimed to study the value of intravenous NAC in reducing liver transplantation and mortality in NAI-ALF. PATIENTS AND METHODS: In a prospective, multicenter, observational study, acute liver failure patients without clinical or historical evidence of acetaminophen overdose were enrolled...
February 15, 2017: Clinical Drug Investigation
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