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https://www.readbyqxmd.com/read/28449547/cobalt-oxide-porous-nanofibers-directly-grown-on-conductive-substrate-as-a-binder-additive-free-lithium-ion-battery-anode-with-high-capacity
#1
Hao Liu, Zheng Zheng, Bochao Chen, Libing Liao, Xina Wang
In order to reduce the amount of inactive materials, such as binders and carbon additives in battery electrode, porous cobalt monoxide nanofibers were directly grown on conductive substrate as a binder/additive-free lithium-ion battery anode. This electrode exhibited very high specific discharging/charging capacities at various rates and good cycling stability. It was promising as high capacity anode materials for lithium-ion battery.
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28449544/measurements-of-defect-structures-by-positron-annihilation-lifetime-spectroscopy-of-the-tellurite-glass-70teo2-5xo-10p2o5-10zno-5pbf2-x%C3%A2-%C3%A2-mg-bi2-ti-doped-with-ions-of-the-rare-earth-element-er-3
#2
K Pach, J Filipecki, E Golis, El S Yousef, V Boyko
The objective of the study was the structural analysis of the 70TeO2-5XO-10P2O5-10ZnO-5PbF2 (X = Mg, Bi2, Ti) tellurite glasses doped with ions of the rare-earth elements Er(3+), based on the PALS (positron annihilation lifetime spectroscopy) method of measuring positron lifetimes. Values of positron lifetimes and the corresponding intensities may be connected with the sizes and number of structural defects, the sizes of which range from a few angstroms to a few dozen nanometers. Experimental positron lifetime spectrum revealed existence of two positron lifetime components τ 1 andτ 2...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28449406/a-water-stable-dual-channel-luminescence-sensor-for-uo22-ion-based-on-an-anionic-terbium-iii-metal-organic-framework
#3
Junwei Ye, Raji Feyisa Bogale, Yangwei Shi, Yanzhen Chen, Xigang Liu, Yaoyao Yang, Siqi Zhang, Jianzhang Zhao, Guiling Ning
A stable 3D Tb(III)-based metal-organic framework [Tb(BPDC)2]*(CH3)2NH2 (DUT-101) was synthesized, and it is the first efficient dual-channel luminescence sensor for aqueous UO22+ ion. DUT-101 possesses an anionic three-dimensional framework and protonated dimethylamine molecules embedded within the channels. Intense green emission of DUT-101 could be highly selectively and sensitively quenched by UO22+ ions even in the coexistence of other competing metal ions. The possible sensing mechanism was proposed as well based on both suppression of luminescence resonance energy transfer and enhancement of intermolecular electronic transfer...
April 27, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28449002/purification-and-biochemical-and-kinetic-properties-of-an-endo-polygalacturonase-from-the-industrial-fungus-aspergillus-sojae
#4
Dante Fratebianchi, Ivana Alejandra Cavello, Sebastián Fernando Cavalitto
An endo-polygalacturonase secreted by Aspergillus sojae was characterized after being purified to homogeneity from submerged cultures with orange peel as the sole carbon source by gel filtration and ion-exchange chromatographies. According to SDS-PAGE and analytical isoelectric focusing analyses, the enzyme presents a molecular weight of 47 kDa and pI value of 4.2. This enzyme exhibits considerable stability under highly acidic to neutral conditions (pH 1.5-6.5) and presents a half-life of 2 h at 50°C. Besides its activity towards pectin and polygalacturonic acid, the enzyme displays pectin-releasing activity, acting best in a pH range of 3...
April 28, 2017: Journal of Molecular Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28448913/temporal-characterization-of-flowback-and-produced-water-quality-from-a-hydraulically-fractured-oil-and-gas-well
#5
James Rosenblum, Andrew W Nelson, Bridger Ruyle, Michael K Schultz, Joseph N Ryan, Karl G Linden
This study examined water quality, naturally-occurring radioactive materials (NORM), major ions, trace metals, and well flow data for water used and produced from start-up to operation of an oil and gas producing hydraulically-fractured well (horizontal) in the Denver-Julesburg (DJ) Basin in northeastern Colorado. Analysis was conducted on the groundwater used to make the fracturing fluid, the fracturing fluid itself, and nine flowback/produced water samples over 220days of operation. The chemical oxygen demand of the wastewater produced during operation decreased from 8200 to 2500mg/L, while the total dissolved solids (TDS) increased in this same period from 14,200 to roughly 19,000mg/L...
April 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28448840/a-cocktail-of-volatile-compounds-emitted-from-alcaligenes-faecalis-jbcs1294-induces-salt-tolerance-in-arabidopsis-thaliana-by-modulating-hormonal-pathways-and-ion-transporters
#6
Dipto Bhattacharyya, Yong Hoon Lee
In our previous study we showed that volatile organic compounds (VOCs) from Alcaligenes faecalis JBCS1294 (JBCS1294) induced tolerance to salt stress in Arabidopsis thaliana by influencing the auxin and gibberellin pathways and upregulating the expression of key ion transporters. The aim of this study was to evaluate the contribution of each VOC and blends of the VOCs on the induction of salt tolerance and signaling pathways. The key VOCs emitted from JBCS1294 were dissolved in lanolin and applied to one side of bipartite I-plates that contained Arabidopsis seeds on Murashige and Skoog (MS) media supplemented with NaCl on the other side...
April 12, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28448834/cmc-prediction-for-ionic-surfactants-in-pure-water-and-aqueous-salt-solutions-based-solely-on-tabulated-molecular-parameters
#7
Stoyan I Karakashev, Stoyan K Smoukov
The critical micelle concentration (CMC) of various surfactants is difficult to predict accurately, yet often necessary to do in both industry and science. Hence, quantum-chemical software packages for precise calculation of CMC were developed, but they are expensive and time consuming. We show here an easy method for calculating CMC with a reasonable accuracy. Firstly, CMC0 (intrinsic CMC, absent added salt) was coupled with quantitative structure - property relationship (QSPR) with defined by us parameter "CMC predictor" f1...
April 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28448833/facile-green-synthesis-of-a-co3v2o8-nanoparticle-electrode-for-high-energy-lithium-ion-battery-applications
#8
Vaiyapuri Soundharrajan, Balaji Sambandam, Jinju Song, Sungjin Kim, Jeonggeun Jo, Pham Tung Duong, Seokhun Kim, Vinod Mathew, Jaekook Kim
In the present study, a metal-organic framework (MOF) derived from a facile water-assisted green precipitation technique is employed to synthesize phase-pure cobalt vanadate (Co3V2O8, CVO) anode for lithium-ion battery (LIB) application. The material obtained by this eco-friendly method is systematically characterized using various techniques such as powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and N2 adsorption-desorption measurements...
April 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28448828/note-on-in-situ-scanning-transmission-electron-microscopy-study-of-liquid-samples
#9
Nan Jiang
Liquid cell (scanning) transmission electron microscopy has been developed rapidly, using amorphous SiNx membranes as electron transparent windows. The current interpretations of electron beam effects are mainly based on radiolytic processes. In this note, additional effects of the electric field due to electron-beam irradiation are discussed. The electric field can be produced by the charge accumulation due to the emission of secondary and Auger electrons. Besides various beam-induced phenomena, such as nanoparticle precipitation and gas bubble formation and motion, two other effects need to be considered; one is the change of Gibbs free energy of nucleation and the other is the violation of Brownian motion due to ion drifting driven by the electric field...
April 19, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28448473/transcriptomic-analysis-of-calcium-remodeling-in-colorectal-cancer
#10
Enrique Pérez-Riesgo, Lucía G Gutiérrez, Daniel Ubierna, Alberto Acedo, Mary P Moyer, Lucía Núñez, Carlos Villalobos
Colorectal cancer (CRC) cells undergo the remodeling of intracellular Ca(2+) homeostasis, which contributes to cancer hallmarks such as enhanced proliferation, invasion and survival. Ca(2+) remodeling includes critical changes in store-operated Ca(2+) entry (SOCE) and Ca(2+) store content. Some changes have been investigated at the molecular level. However, since nearly 100 genes are involved in intracellular Ca(2+) transport, a comprehensive view of Ca(2+) remodeling in CRC is lacking. We have used Next Generation Sequencing (NGS) to investigate differences in expression of 77 selected gene transcripts involved in intracellular Ca(2+) transport in CRC...
April 27, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28448263/zinc-and-wound-healing-a-review-of-zinc-physiology-and-clinical-applications
#11
Samuel Kogan, Aditya Sood, Mark S Garnick
Our understanding of the role of zinc in normal human physiology is constantly expanding, yet there are major gaps in our knowledge with regard to the function of zinc in wound healing. This review aims to provide the clinician with sufficient understanding of zinc biology and an up-to-date perspective on the role of zinc in wound healing. Zinc is an essential ion that is crucial for maintenance of normal physiology, and zinc deficiency has many manifestations ranging from delayed wound healing to immune dysfunction and impairment of multiple sensory systems...
April 2017: Wounds: a Compendium of Clinical Research and Practice
https://www.readbyqxmd.com/read/28448234/leveraging-clinical-imaging-archives-for-radiomics-reliability-of-automated-methods-for-brain-volume-measurement
#12
Viraj R Adduru, Andrew M Michael, Maria Helguera, Stefi A Baum, Gregory J Moore
Purpose To validate the use of thick-section clinically acquired magnetic resonance (MR) imaging data for estimating total brain volume (TBV), gray matter (GM) volume (GMV), and white matter (WM) volume (WMV) by using three widely used automated toolboxes: SPM ( www.fil.ion.ucl.ac.uk/spm/ ), FreeSurfer ( surfer.nmr.mgh.harvard.edu ), and FSL (FMRIB software library; Oxford Centre for Functional MR Imaging of the Brain, Oxford, England, https://fsl.fmrib.ox.ac.uk/fsl ). Materials and Methods MR images from a clinical archive were used and data were deidentified...
April 27, 2017: Radiology
https://www.readbyqxmd.com/read/28448154/improving-lithium-sulfur-battery-performance-under-lean-electrolyte-through-nanoscale-confinement-in-soft-swellable-gels
#13
Junzheng Chen, Wesley A Henderson, Huilin Pan, Brian R Perdue, Ruiguo Cao, Jian Zhi Hu, Chuan Wan, Kee Sung Han, Karl T Mueller, Ji-Guang Zhang, Yuyan Shao, Jun Liu
Li-S batteries have been extensively studied using rigid carbon as the host for sulfur encapsulation, but improving the properties with a reduced electrolyte amount remains a significant challenge. This is critical for achieving high energy density. Here, we developed a soft PEO10LiTFSI polymer swellable gel as a nanoscale reservoir to trap the polysulfides under lean electrolyte conditions. The PEO10LiTFSI gel immobilizes the electrolyte and confines polysulfides within the ion conducting phase. The Li-S cell with a much lower electrolyte to sulfur ratio (E/S) of 4 gE/gS (3...
April 27, 2017: Nano Letters
https://www.readbyqxmd.com/read/28448149/hofmeister-effect-on-pnipam-in-bulk-and-at-an-interface-surface-partitioning-of-weakly-hydrated-anions
#14
Saeed Zajforoushan Moghaddam, Esben Thormann
Effect of sodium fluoride, sodium trichloroacetate, and sodium thiocyanate on the stability and conformation of poly(N-isopropylacrylamide), in bulk solution and at the gold-aqueous interface, is investigated by differential scanning calorimetry, dynamic light scattering, quartz crystal microbalance, and atomic force microscopy. The results indicate a surface partitioning of the weakly hydrated anions, i.e., thiocyanate and trichloroacetate, and the findings are discussed in terms of anion-induced electrostatic stabilization...
April 27, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28448130/the-peculiar-role-of-the-au3-unit-in-aum-clusters-%C3%AF-aromaticity-of-the-au5zn-ion
#15
Yanle Li, Vytor Oliveira, Chunmei Tang, Dieter Cremer, Chunyan Liu, Jing Ma
The stability of small Aum (m = 4-7) clusters is investigated by analyzing their energetic, geometric, vibrational, magnetic, and electron density properties. Gold clusters can be constructed from stable cyclic 3-center-2-electron (3c-2e) Au3(+) units (3-rings) with σ-aromaticity. The stabilization requires a flow of negative charge from internal 3-rings with electron-deficient bonding to peripheral 3-ring units with stronger Au-Au bonds. The valence-isoelectronic clusters Au6 and Au5Zn(+) have similar electronic properties: Au5Zn(+) is a strongly σ-aromatic molecule...
April 27, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28448119/sulfur-nano-dots-stitched-in-2d-bubble-like-interconnected-carbon-fabric-as-reversibility-enhanced-cathodes-for-lithium-sulfur-batteries
#16
Feng Wu, Yusheng Ye, Jia-Qi Huang, Teng Zhao, Ji Qian, Yuanyuan Zhao, Li Li, Lei Wei, Rui Luo, Yongxin Huang, Yi Xing, Renjie Chen
The behavior of two-dimensional (2D) materials for energy-storage systems relates to their morphology and physicochemical properties. Although various 2D materials can be found in different fields, the open access of these materials has greatly hampered their practical applications, such as in lithium sulfur batteries, where the soluble intermediates should be controlled. Here, we have developed a facile approach to prepare 2D ultra-thin interconnected carbon fabrics (ICFs) with "bubble-like" morphology and abundant mesopores using a "blowing bubble" method...
April 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/28448112/real-time-imaging-of-2d-and-3d-temperature-distribution-coating-of-metal-ion-intercalated-organic-layered-composites-with-tunable-stimuli-responsive-properties
#17
Machi Takeuchi, Hiroaki Imai, Yuya Oaki
Organic layered materials have intercalation and dynamic properties. The dynamic properties are tuned by the intercalation of the guests. In general, howevver, it is not easy to achieve homogeneous and thin coating of the layered materials on substrates with complex shapes because of the two-dimentional anisotropic structures. In the present work, the layered organic composites were homogeneously coated on a variety of substrates for application to practical devices. The metal-ion-intercalated layered polydiacetylene (PDA-Mn+) with tunable stimuli-responsive color-change properties was coated on substrates, such as paper and cotton consisting of cellulose fibers...
April 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28447993/synthesis-of-1-2-azaborines-and-the-preparation-of-their-protein-complexes-with-t4-lysozyme-mutants
#18
Hyelee Lee, Shih-Yuan Liu
We describe a general synthesis of 1,2-azaborines using standard air-free techniques and protein complex preparation with T4 lysozyme mutants by vapor diffusion. Oxygen- and moisture-sensitive compounds are prepared and isolated under an inert atmosphere (N2) using either a vacuum gas manifold or a glove box. As an example of azaborine synthesis, we demonstrate the synthesis and purification of the volatile N-H-B-ethyl-1,2-azaborine by a five-step sequence involving distillation and column chromatography for the isolation of products...
March 25, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28447978/high-resolution-thermal-micro-imaging-using-europium-chelate-luminescent-coatings
#19
Timothy M Benseman, Yang Hao, Vitalii K Vlasko-Vlasov, Ulrich Welp, Alexei E Koshelev, Wai-Kwong Kwok, Ralu Divan, Courtney Keiser, Chiharu Watanabe, Kazuo Kadowaki
Micro-electronic devices often undergo significant self-heating when biased to their typical operating conditions. This paper describes a convenient optical micro-imaging technique which can be used to map and quantify such behavior. Europium thenoyltrifluoroacetonate (EuTFC) has a 612 nm luminescence line whose activation efficiency drops strongly with increasing temperature, due to T-dependent interactions between the Eu(3+) ion and the organic chelating compound. This material may be readily coated on to a sample surface by thermal sublimation in vacuum...
April 16, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28447777/phosphorus-rich-cup2-embedded-in-carbon-matrix-as-a-high-performance-anode-for-lithium-ion-batteries
#20
Sang-Ok Kim, Arumugam Manthiram
Phosphorus-rich CuP2 and its carbon composites have been investigated as an anode material for lithium-ion batteries. Through a facile, low-cost mechanochemical reaction, micro-sized composites composed of active CuP2 particles uniformly embedded in the carbon matrix have been successfully synthesized. Combined structural and electrochemical characterizations show that phosphorus-rich CuP2 undergoes irreversible reaction with lithium, giving metal-rich Cu3P and amorphous phosphorus at the end of the first cycle...
April 27, 2017: ACS Applied Materials & Interfaces
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