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https://www.readbyqxmd.com/read/28103016/sns2-nanowall-arrays-toward-high-performance-sodium-storage
#1
Peng Zhou, Xiao Wang, Wenhao Guan, Dan Zhang, Libin Fang, Yinzhu Jiang
Cost-effective sodium ion batteries (SIBs) are springing out as desirable alternative choice of lithium ion batteries (LIBs), in terms of application in large-scale energy storage devices. SnS2 is regarded as a potential anode material for SIBs due to its unique layered structure and high theoretical specific capacity. However, the development of SnS2 was hindered by the sluggish kinetics of diffusion process and the inevitable volume change during repeated sodiation/desodiation processes. In this work, SnS2 with a unique nanowall arrays (NWAs) structure is fabricated by one-step pulsed spray evaporation chemical vapor deposition (PSE-CVD), which could be used directly as binder-free and carbon-free anodes for SIBs...
January 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28102497/regulated-partitioning-of-fixed-carbon-14-c-sodium-na-potassium-k-and-glycine-betaine-determined-salinity-stress-tolerance-of-gamma-irradiated-pigeonpea-cajanus-cajan-l-millsp
#2
Pankaj Kumar, Vasundhara Sharma, Chobhe Kapil Atmaram, Bhupinder Singh
Soil salinity is a major constraint that limits legume productivity. Pigeonpea is a salt sensitive crop. Seed gamma irradiation at a very low dose (2.5 Gy) is known to enhance seedling establishment, plant growth and yield of cereals and other crops. The present study conducted using two genetically diverse varieties of pigeonpea viz., Pusa-991 and Pusa-992 aimed at establishing the role of pre-sowing seed gamma irradiation at 0, 0.0025, 0.005, 0.01, 0.02, 0.05 and 0.1 kGy on plant growth, seed yield and seed quality under salt stress at 0, 80 and 100 mM NaCl (soil solution EC equivalent 1...
January 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28102408/bottom-up-synthesis-of-nitrogen-doped-porous-carbon-scaffolds-for-lithium-and-sodium-storage
#3
Hongling Lu, Renpeng Chen, Yi Hu, Xiaoqi Wang, Yanrong Wang, Lianbo Ma, Guoyin Zhu, Tao Chen, Zuoxiu Tie, Zhong Jin, Jie Liu
Here we report an effective bottom-up solution-phase process for the preparation of nitrogen-doped porous carbon scaffolds (NPCSs), which can be employed as high-performance anode materials for both lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). The as-obtained NPCSs show favorable features for electrochemical energy storage such as high specific surface area, appropriate pore size distribution (3.9 nm in average), large pore volume (1.36 cm(3) g(-1)), nanosheet-like morphology, a certain degree of graphitization, enlarged interlayer distance (0...
January 19, 2017: Nanoscale
https://www.readbyqxmd.com/read/28098465/rejection-of-commonly-used-electrolyte-in-asymmetric-flow-field-flow-fractionation-effects-of-membrane-molecular-weight-cut-off-size-fluid-dynamics-and-valence-of-electrolytes
#4
Thilak K Mudalige, Haiou Qu, Sean W Linder
Asymmetric flow field flow fractionation (AF4) is an efficient size based separation technique for the characterization of submicron size particulates. In AF4, membranes having various molecular weight cut-off sizes are used as a barrier to retain particles while allowing carrier fluid containing electrolytes to permeate. Here, we hypothesized that electrolyte rejection by the barrier membrane lead to the accumulation of the electrolytes in the channel during operation. Electrolyte accumulation can cause various adverse effects which can lead to membrane fouling...
January 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28098442/a-nasicon-type-mg0-5ti2-po4-3-negative-electrode-material-exhibits-different-electrochemical-energy-storage-mechanisms-in-na-ion-and-li-ion-batteries
#5
Yingying Zhao, Zhixuan Wei, Qiang Pang, Yingjin Wei, Yongmao Cai, Qiang Fu, Fei Du, Angelina Sarapulova, Helmut Ehrenberg, Bingbing Liu, Gang Chen
A Carbon-coated Mg0.5Ti2(PO4)3 polyanion material was prepared by the sol-gel method and then studied as the negative electrode materials for lithium-ion and sodium-ion batteries. The material showed a specific capacity of 268.6 mAh g-1 in the voltage window of 0.01-3.0 V vs. Na+/Na0. Due to the fast diffusion of Na+ in the NASICON framework, the material exhibited superior rate capability with a specific capacity of 94.4 mAh g-1 at a current density of 5A g-1. Additionally, 99.1 % capacity retention was achieved after 300 cycles, demonstrating excellent cycle stability...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28098231/reduced-graphene-oxide-as-a-stable-and-high-capacity-cathode-material-for-na-ion-batteries
#6
Ghulam Ali, Asad Mehmood, Heung Yong Ha, Jaehoon Kim, Kyung Yoon Chung
We report the feasibility of using reduced graphene oxide (RGO) as a cost-effective and high performance cathode material for sodium-ion batteries (SIBs). Graphene oxide is synthesized by a modified Hummers' method and reduced using a solid-state microwave irradiation method. The RGO electrode delivers an exceptionally stable discharge capacity of 240 mAh g(-1) with a stable long cycling up to 1000 cycles. A discharge capacity of 134 mAh g(-1) is obtained at a high current density of 600 mA g(-1), and the electrode recovers a capacity of 230 mAh g(-1) when the current density is reset to 15 mA g(-1) after deep cycling, thus demonstrating the excellent stability of the electrode with sodium de/intercalation...
January 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28097861/light-driven-au-wo3-c-janus-micromotors-for-rapid-photodegradation-of-dye-pollutants
#7
Qilu Zhang, Renfeng Dong, Yefei Wu, Wei Gao, Zihan He, Biye Ren
A novel light-driven Au-WO3@C Janus micromotor based on colloidal carbon WO3 nanoparticle composite spheres (WO3@C) prepared by one-step hydrothermal treatment is described. The Janus micromotors can move in aqueous media at a speed of 16 μm/s under 40 mW/cm2 UV light due to diffusiophoretic effects. The propulsion of such Au-WO3@C Janus micromotors (diameter ~1.0 μm) can be generated by UV light in pure water without any external chemical fuels and readily modulated by light intensity. After depositing a paramagnetic Ni layer between Au layer and WO3, the motion direction of the micromotor can be precisely controlled by an external magnetic field...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28095321/cellulose-to-depolymerize%C3%A2-or-not-to
#8
REVIEW
Sergiu Coseri
Oxidation of the primary OH groups in cellulose is a pivotal reaction both at lab and industrial scale, leading to the value-added products, i.e. oxidized cellulose which have tremendous applications in medicine, pharmacy and hi-tech industry. Moreover, the introduction of carboxyl moieties creates prerequisites for further cellulose functionalization through covalent attachment or electrostatic interactions, being an essential achievement designed to boost the area of cellulose-based nanomaterials fabrication...
January 14, 2017: Biotechnology Advances
https://www.readbyqxmd.com/read/28092980/hydrogeochemical-and-isotope-study-of-perched-aquifers-in-the-cuvelai-etosha-basin-namibia
#9
Josefina T Hamutoko, Heike Wanke, Paul Koeniger, Matthias Beyer, Marcel Gaj
A hydrogeochemical and stable isotope study ((2)H and (18)O) was carried out in the Cuvelai-Etosha Basin in order to characterize available groundwater and to identify possible recharge mechanisms for the perched aquifers. Data were collected during seven field campaigns between 2013 and 2015 from a total of 24 shallow and deep groundwater hand-dug wells. In the investigated groundwaters, hydrogencarbonate is the dominating anion in both well types, whereas cations vary between calcium and magnesium in deep wells, and sodium and potassium in shallow wells...
January 16, 2017: Isotopes in Environmental and Health Studies
https://www.readbyqxmd.com/read/28088096/mycelium-transformation-of-streptomyces-toxytricini-into-pellet-role-of-culture-conditions-and-kinetics
#10
Punit Kumar, Kashyap Kumar Dubey
The present study envisages the role of different carbon sources, nitrogen sources, metals, pH, inoculum volume and agitation rate in pellet formation of S. toxytricini at shake-flask level. It was found that galactose, ammonium sulphate, sodium nitrate, Cu(2+), Zn(2+), higher inoculum volume (5% v/v) and agitation rate at 300rpm caused significant reduction in pellet size (up to the range of 30μm-0.5mm) but biomass formations was also reduced subsequently. Interestingly diffused type of morphology was obtained in Fe(2+) supplemented medium with reduced biomass (1...
January 6, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28081362/lithium-carbonate-recovery-from-cathode-scrap-of-spent-lithium-ion-battery-a-closed-loop-process
#11
Wenfang Gao, Xihua Zhang, Xiaohong Zheng, Xiao Lin, Hongbin Cao, Yi Zhang, Zhi H I Sun
A closed-loop process to recover lithium carbonate from cathode scrap of lithium-ion battery (LIB) is developed. Lithium could be selectively leached into solution using formic acid while aluminum remained as metallic form and most of other metals from the cathode scrap could be precipitated out. This phenomenon clearly demonstrates that formic acid can be used for lithium recovery from cathode scrap, as both leaching and separation reagent. By investigating the effects of different parameters including temperature, formic acid concentration, H2O2 amount and solid to liquid ratio, the leaching rate of Li can reach 99...
January 12, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28075123/nitrogen-doped-yolk-shell-structured-cose-c-dodecahedra-for-high-performance-sodium-ion-batteries
#12
Yifang Zhang, Anqiang Pan, Lin Ding, Zilong Zhou, Yaping Wang, Shaoyu Niu, Shuquan Liang, Guozhong Cao
In this work, nitrogen-doped, yolk-shell structured CoSe/C mesoporous dodecahedra are successfully prepared by using a self-sacrificial templating strategy. The CoSe nanoparticles are in-situ formed in the metal organic frameworks and the organic species are simultaneously converted into nitrogen-doped carbon in an inert atmosphere. For the yolk-shell structured CoSe/C composite, the carbon framework has relative high graphitizing extent and high nitrogen content (17.65%). Furthermore, the CoSe nanoparticles with size of around 15 nm are coherently confined in the mesoporous carbon framework...
January 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28070612/macrolide-antibiotics-differentially-influence-human-hepg2-cytotoxicity-and-modulate-intrinsic-extrinsic-apoptotic-pathways-in-rat-hepatocellular-carcinoma-model
#13
Nagwa I Abdel-Hamid, Mona F El-Azab, Yasser M Moustafa
This study was designed to examine the potential antitumor effect of some macrolides: clarithromycin, azithromycin, and erythromycin on chemically induced hepatocellular carcinoma (HCC) in rats and on human hepatoma cells (HepG2) as well. The possible underlying antiapoptotic mechanisms were investigated. Antiproliferative activity was assessed in HepG2 using Sulforhodamine-B staining method. In vivo, HCC was induced in rats by initiation-selection-promotion protocol using diethylnitrosamine (200 mg/kg, single i...
January 9, 2017: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/28068543/cobalt-sulfide-nanoparticles-anchored-in-three-dimensional-carbon-nanosheet-networks-for-lithium-and-sodium-ion-batteries-with-enhanced-electrochemical-performance
#14
Xing Zhang, Hui Wang, Gang Wang
In order to improve the conductivity and electrochemical activity, Co9S8 nanoparticles anchored in three-dimensional carbon nanosheet networks (3D Co9S8@CNNs) are fabricated by a simple strategy with the assistance of NaCl. Combining the advantages of nanoscale and porous structure, 3D Co9S8@CNNs can retard the aggregation of Co9S8 nanoparticles, provide abundant electrochemical active sites, as well as accommodate the mechanical stress during the cycling of lithium ion batteries (LIBs) or sodium ion batteries (SIBs)...
December 31, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28067499/ultraconcentrated-sodium-bis-fluorosulfonyl-imide-based-electrolytes-for-high-performance-sodium-metal-batteries
#15
Jaegi Lee, Yongwon Lee, Jeongmin Lee, Sang-Min Lee, Jeong-Hee Choi, Hyungsub Kim, Mi-Sook Kwon, Kisuk Kang, Kyu Tae Lee, Nam-Soon Choi
We present an ultraconcentrated electrolyte composed of 5 M sodium bis(fluorosulfonyl)imide in 1,2-dimethoxyethane for Na metal anodes coupled with high-voltage cathodes. Using this electrolyte, a very high Coulombic efficiency of 99.3% at the 120th cycle for Na plating/stripping is obtained in Na/stainless steel (SS) cells with highly reduced corrosivity toward Na metal and high oxidation durability (over 4.9 V versus Na/Na(+)) without corrosion of the aluminum cathode current collector. Importantly, the use of this ultraconcentrated electrolyte results in substantially improved rate capability in Na/SS cells and excellent cycling performance in Na/Na symmetric cells without the increase of polarization...
January 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28067399/conversion-of-1t-mose2-to-2h-mos2xse2-2x-mesoporous-nanospheres-for-superior-sodium-storage-performance
#16
Junjun Zhang, Wenpei Kang, Miao Jiang, Yu You, Yulin Cao, Tsz-Wai Ng, Denis Y W Yu, Chun-Sing Lee, Jun Xu
S-Doped 2H-MoSe2 (i.e., 2H-MoS2xSe2-2x) mesoporous nanospheres assembled from several-layered nanosheets are synthesized by sulfurizing freshly-prepared 1T-MoSe2 nanospheres, and they serve as a robust host material for sodium storage. The sulfuration treatment is found to be beneficial for removing surface/interface insulating organic contaminants and converting the 1T phase to the 2H phase with improved crystallinity and electrical conductivity. These result in significantly enhanced sodium storage performance, including charge/discharge capacity, first Coulombic efficiency, cycling stability, and rate capability...
January 9, 2017: Nanoscale
https://www.readbyqxmd.com/read/28065864/value-of-ph-regulators-in-the-diagnosis-prognosis-and-treatment-of-cancer
#17
REVIEW
Sara Granja, Diana Tavares-Valente, Odília Queirós, Fátima Baltazar
Altered metabolism, associated with acidification of the extracellular milieu, is one of the major features of cancer. As pH regulation is crucial for the maintenance of all biological functions, cancer cells rely on the activity of lactate exporters and proton transporters to regulate their intracellular pH. The major players in cancer pH regulation are proton pump ATPases, sodium-proton exchangers (NHEs), monocarboxylate transporters (MCTs), carbonic anhydrases (CAs) and anion exchangers (AEs), which have been shown to be upregulated in several human malignancies...
January 5, 2017: Seminars in Cancer Biology
https://www.readbyqxmd.com/read/28064501/amphiphilic-and-hydrophilic-block-copolymers-from-aliphatic-n-substituted-8-membered-cyclic-carbonates-a-versatile-macromolecular-platform-for-biomedical-applications
#18
Shrinivas Venkataraman, Jeremy P K Tan, Victor W L Ng, Eddy W P Tan, James L Hedrick, Yi Yan Yang
Introduction of hydrophilic components, particularly amines and zwitterions, onto a degradable polymer platform, while maintaining precise control over the polymer composition, has been a challenge. Recognizing the importance of these hydrophilic residues in multiple aspects of the nanobiomedicine field, herein, a straightforward synthetic route to access well-defined amphiphilic and hydrophilic degradable block copolymers from diethanolamine-derived functional eight-membered N-substituted aliphatic cyclic carbonates is reported...
January 9, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28056938/hepatoprotective-effect-of-the-solvent-extracts-of-viola-canescens-wall-ex-roxb-against-ccl4-induced-toxicity-through-antioxidant-and-membrane-stabilizing-activity
#19
Abdullah, Mir Azam Khan, Waqar Ahmad, Manzoor Ahmad, Mohammad Nisar
BACKGROUND: Viola canescens Wall. ex. Roxb. exhibits analgesic, antimalarial and antispasmodic activities. It is used folklorically for the treatment of liver diseases, hypertension, malaria and cancer. The current study investigates phytochemical constituents, antioxidant and hepatoprotective activity of solvent extracts of whole plant of Viola canescens. METHODS: Phytochemicals, acute toxicity study and antioxidant activity of Viola canescens methanolic extract (VCME), ethyl acetate fraction (EAF), and partially purified EAF (90% EAF and combination of 80% EAF + 20% methanol fraction (EAF + Me) was carried out...
January 5, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28052395/herbivores-sculpt-leaf-traits-differently-in-grasslands-depending-on-life-form-and-land-use-histories
#20
Jennifer Firn, Martin Schütz, Huong Nguyen, Anita C Risch
Vertebrate and invertebrate herbivores alter plant communities directly by selectively consuming plant species; and indirectly by inducing morphological and physiological changes to plant traits that provide competitive or survivorship advantages to some life forms over others. Progressively excluding aboveground herbivore communities (ungulates, medium and small sized mammals, invertebrates) over five growing seasons, we explored how leaf morphology (specific leaf area or SLA) and nutrition (nitrogen, carbon, phosphorous, potassium, sodium, and calcium) of different plant life forms (forbs, legumes, grasses, sedges) correlated with their dominance...
January 2017: Ecology
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