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https://www.readbyqxmd.com/read/28208016/highly-efficient-and-exceptionally-durable-co2-photoreduction-to-methanol-over-freestanding-defective-single-unit-cell-bismuth-vanadate-layers
#1
Shan Gao, Bingchuan Gu, Xingchen Jiao, Yongfu Sun, Xiaolong Zu, Fan Yang, Wenguang Zhu, Chengming Wang, Zimou Feng, Bangjiao Ye, Yi Xie
Unearthing an ideal model for disclosing the role of defect sites in solar CO2 reduction remains a great challenge. Here, freestanding gram-scale single-unit-cell o-BiVO4 layers are successfully synthesized for the first time. Positron annihilation spectrometry and X-ray fluorescence unveil their distinct vanadium vacancy concentrations. Density functional calculations reveal the introduction of vanadium vacancies brings a new defect level and higher hole concentration near Fermi level, resulting in increased photoabsorption and superior electronic conductivity...
February 16, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28204978/characterization-and-cytotoxic-effect-of-aqua-2-2-2-nitrilotriacetato-oxo-vanadium-salts-on-human-osteosarcoma-cells
#2
Aleksandra Tesmar, Dariusz Wyrzykowski, Rafał Kruszyński, Karolina Niska, Iwona Inkielewicz-Stępniak, Joanna Drzeżdżon, Dagmara Jacewicz, Lech Chmurzyński
The use of protonated N-heterocyclic compound, i.e. 2,2'-bipyridinium cation, [bpyH(+)], enabled to obtain the new nitrilotriacetate oxidovanadium(IV) salt of the stoichiometry [bpyH][VO(nta)(H2O)]H2O. The X-ray measurements have revealed that the compound comprises the discrete mononuclear [VO(nta)(H2O)](-) coordination ion that can be rarely found among other known compounds containing nitrilotriacetate oxidovanadium(IV) moieties. The antitumor activity of [bpyH][VO(nta)(H2O)]H2O and its phenanthroline analogue, [phenH][VO(nta)(H2O)](H2O)0...
February 15, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28203657/presence-of-peierls-pairing-and-absence-of-insulator-to-metal-transition-in-vo2-a-a-structure-property-relationship-study
#3
S R Popuri, A Artemenko, R Decourt, A Villesuzanne, M Pollet
Layered vanadium oxides have been extensively explored due to their interesting metal-insulator transitions and energy conversion/storage applications. In the present study, we have successfully synthesized VO2 (A) polymorph powder samples by a single-step hydrothermal synthesis process and consolidated them using spark plasma sintering. The structural and electronic properties of VO2 (A) are measured over a large temperature range from liquid helium, across the structural transition (400-440 K) and up to 500 K...
February 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28202346/acute-toxicity-twenty-eight-days-repeated-dose-toxicity-and-genotoxicity-of-vanadyl-trehalose-in-kunming-mice
#4
Pingzhe Jiang, Zaizhong Ni, Bin Wang, Baicheng Ma, Huikun Duan, Xiaodan Li, Xiaofeng Ma, Qian Wei, Xiangzhen Ji, Qiqi Liu, Shuguang Xing, Minggang Li
A new trend has been developed using vanadium and organic ligands to form novel compounds in order to improve the beneficial actions and reduce the toxicity of vanadium compounds. In present study, vanadyl trehalose was explored the oral acute toxicity, 28 days repeated dose toxicity and genotoxicity in Kunming mice. The Median Lethal Dose (LD50) of vanadyl trehalose was revealed to be 1000 mg/kg body weight in fasted Kunming mice. Stomach and intestine were demonstrated to be the main target organs of vanadyl trehalose through 28 days repeated dose toxicity study...
February 12, 2017: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/28199079/heterogeneous-tio2-v2o5-carbon-nanotube-electrodes-for-lithium-ion-batteries
#5
Mert Kurttepeli, Shaoren Deng, Felix Mattelaer, Daire J Cott, Philippe Vereecken, Jolien Dendooven, Christophe Detavernier, Sara Bals
Vanadium pentoxide (V2O5) is proposed and investigated as a cathode material for lithium ion batteries. However, the dissolution of V2O5 during the charge/discharge remains as an issue at the V2O5-electrolyte interface. In this work, we present a heterogeneous nanostructure with carbon nanotubes supported V2O5/titanium dioxide (TiO2) multilayers as electrodes for thin-film Li-ion batteries. Atomic layer deposition of V2O5 on carbon nanotubes provides enhanced Li storage capacity and high rate performance. An additional TiO2 layer leads to increased morphological stability and in return higher cycling performance of V2O5/carbon nanotubes...
February 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28197835/selenium-vanadium-and-chromium-as-micronutrients-to-improve-metabolic-syndrome
#6
REVIEW
Sunil K Panchal, Stephen Wanyonyi, Lindsay Brown
Trace metals play an important role in the proper functioning of carbohydrate and lipid metabolism. Some of the trace metals are thus essential for maintaining homeostasis, while deficiency of these trace metals can cause disorders with metabolic and physiological imbalances. This article concentrates on three trace metals (selenium, vanadium, and chromium) that may play crucial roles in controlling blood glucose concentrations possibly through their insulin-mimetic effects. For these trace metals, the level of evidence available for their health effects as supplements is weak...
March 2017: Current Hypertension Reports
https://www.readbyqxmd.com/read/28197617/mechanistic-insights-on-the-electronic-properties-and-electronic-atomic-structure-aspects-in-orthorhombic-srvo3-thin-films-xanes-exafs-study
#7
Aditya Sharma, Mayora Varshney, Weon Cheol Lim, Hyun-Joon Shin, Jitendra Pal Singh, Sung Ok Won, Keun Hwa Chae
Correlations among the B-O6 octahedra distortions, existing polymorphous phases, band structures and electronic conductivities of ABO3 perovskites are matters for debate and require a deep understanding of their local atomic/electronic structures and diverse assets. In this study, to illustrate the distortion in V-O6 octahedra and its implication on the band structure and electronic properties, spectroscopic investigations on the RF-sputtering grown insulating SrVO3 thin films were employed using X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS)...
February 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28195670/a-bunch-like-tertiary-amine-grafted-polysulfone-membrane-for-vrfbs-with-simultaneously-high-proton-conductivity-and-low-vanadium-ion-permeability
#8
Qinglong Tan, Shanfu Lu, Jiangju Si, Haining Wang, Chunxiao Wu, Xianfeng Li, Yan Xiang
Novel polysulfone membranes with bunch-like tertiary amine groups are synthesized with high ion selectivity and outstanding chemical stability for vanadium redox flow batteries (VRFBs). The bunch-like tertiary amine groups simultaneously act as an ionic conductor for proton hopping and vanadium ion transport obstacles. The performance of the membrane is tuned via controlling the grafting degree of the chloromethylated polysulfone. The results show that membranes show increasing proton over vanadium ion (σ/p) selectivity with increasing functional tertiary groups...
February 13, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28194910/hollow-iron-vanadium-composite-spheres-a-highly-efficient-iron-based-water-oxidation-electrocatalyst-without-the-need-for-nickel-or-cobalt
#9
Ke Fan, Yongfei Ji, Haiyuan Zou, Jinfeng Zhang, Bicheng Zhu, Hong Chen, Quentin Daniel, Yi Luo, Jiaguo Yu, Licheng Sun
Noble-metal-free bimetal-based electrocatalysts have shown high efficiency for water oxidation. Ni and/or Co in these electrocatalysts are essential to provide a conductive, high-surface area and a chemically stable host. However, the necessity of Ni or Co limits the scope of low-cost electrocatalysts. Herein, we report a hierarchical hollow FeV composite, which is Ni- and Co-free and highly efficient for electrocatalytic water oxidation with low overpotential 390 mV (10 mA cm(-2) catalytic current density), low Tafel slope of 36...
February 14, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28194470/effect-of-vanadium-on-calcium-homeostasis-osteopontin-mrna-expression-and-bone-microarchitecture-in-diabetic-rats
#10
Cristina Sanchez-Gonzalez, Laura Moreno, Carlos Lopez-Chaves, Elena Nebot, Peter Pietschmann, Alba Rodriguez-Nogales, Julio Galvez, María Montes-Bayon, Alfredo Sanz-Medel, Juan Llopis
The aim of this study was to examine whether alterations caused by diabetes in calcium homeostasis, expression of osteopontin and the microarchitecture of bone are corrected by exposure to vanadium. Four study groups were examined over a period of five weeks: control (C), diabetic (DM), diabetic treated with 1 mg V per d (DMV), and diabetic treated with 3 mg V per d (DMVH). Vanadium was supplied in drinking water as bis(maltolato)oxovanadium(iv). Calcium was measured in the food, faeces, urine, serum, kidneys, liver, muscles, and femur...
February 14, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/28189109/superior-selectivity-and-enhanced-response-characteristics-of-palladium-sensitized-vanadium-pentoxide-nanorods-for-detection-of-nitrogen-dioxide-gas
#11
A A Mane, M P Suryawanshi, J H Kim, A V Moholkar
Vanadium pentoxide (V2O5) nanorods have been deposited onto the glass substrates by spraying 75ml of 30mM vanadium trichloride (VCl3) solution at optimized substrate temperature of 400°C. The XRD study confirms the formation of orthorhombic crystal structure of V2O5 nanorods. The FE-SEM micrograph shows the nanorods-like morphology of V2O5. The presence of palladium (Pd) in the Pd-sensitized V2O5 nanorods is confirmed using EDAX study. The gas sensing measurements show that the Pd-sensitized V2O5 sensing material is an outstanding candidate for nitrogen dioxide (NO2) gas detection...
February 3, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28187941/photocatalytic-degradation-properties-of-v-doped-tio2-to-automobile-exhaust
#12
Tong Wang, Dongya Shen, Tao Xu, Ruiling Jiang
To improve the photocatalytic degradation properties of titanium dioxide (TiO2) used as raw materials for purifying automobile exhaust (AE), the vanadium (V)-doped TiO2 samples were prepared. The photocatalytic degradation efficiencies of V-doped TiO2 to each component in AE were evaluated under ultraviolet (UV) and visible light irradiation, respectively. Results indicated that the photocatalytic activity of V-doped TiO2 to AE was higher than that of pure TiO2, and the optimal V dopant content of TiO2 was 1...
February 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28183674/albumin-coatings-by-alternating-current-electrophoretic-deposition-for-improving-corrosion-resistance-and-bioactivity-of-titanium-implants
#13
Sarah Höhn, Annabel Braem, Bram Neirinck, Sannakaisa Virtanen
Although Ti alloys are generally regarded to be highly corrosion resistant, inflammatory conditions following surgery can instigate breakdown of the TiO2 passivation layer leading to an increased metal ion release. Furthermore proteins present in the surrounding tissue will readily adsorb on a titanium surface after implantation. In this paper alternating current electrophoretic deposition (AC-EPD) of bovine serum albumin (BSA) on Ti6Al4V was investigated in order to increase the corrosion resistance and control the protein adsorption capability of the implant surface...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28181800/vanadium-geochemistry-of-oil-sands-fluid-petroleum-coke
#14
Jake A Nesbitt, Matthew B J Lindsay
Vanadium has previously been linked to elevated toxicity of leachates derived from oil sands petroleum coke. However, geochemical controls on V mobility within coke deposits remain poorly constrained. Detailed examinations of porewater and solid-phase V geochemistry were therefore performed on oil sands fluid petroleum coke deposits in Alberta, Canada. Sample collection focused on both active and reclaimed deposits, which contained more than 3 × 10(7) m(3) of fluid petroleum coke. Dissolved V concentrations were highest (up to 3...
February 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28179696/effects-of-oral-vanadium-on-glycaemic-and-lipid-profile-in-rats
#15
Syed Zubair Hussain Shah, Abdul Khaliq Naveed, Amir Rashid
OBJECTIVE: Vanadyl sulphate, an inorganic tetravalent salt of transition metal vanadium is conventionally used to treat diabetes and by athletes as body-building supplement. Vanadyl sulphate is a constituent of many supplements and herbal preparations available over the counter in many parts of the world. In this study the efficacy of the salt as hypoglycaemic agent and its effects on lipid profile were determined when administered in therapeutic dose range (in humans) to healthy Sprague Dawley rats for a considerable duration...
December 2016: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/28165040/lead-free-piezoelectrics-v-3-to-v-5-ion-conversion-promoting-the-performances-of-v-doped-zinc-oxide
#16
M Laurenti, M Castellino, D Perrone, A Asvarov, G Canavese, A Chiolerio
Vanadium doped ZnO (VZO) thin films were grown by RF magnetron sputtering, starting from a ZnO:V ceramic target. The crystal structure, chemical composition, electric and piezoelectric properties of the films were investigated either on the as-grown thin films or after a post-deposition rapid thermal annealing (RTA) treatment performed at 600 °C for different lengths of time (1 and 5 min) in an oxygen atmosphere. Substitutional doping of Zn(2+) with V(3+) and V(5+) ions strongly deteriorated the hexagonal wurtzite ZnO structure of the as-grown thin films due to lattice distortion...
February 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28164465/solar-cells-materials-by-design-hybrid-pyroxene-corner-sharing-vo4-tetrahedral-chains
#17
Fedwa El-Mellouhi, Akinlolu Akande, Carlo Motta, Sergey Rashkeev, Golibjon Berdiyorov, Mohamed El-Amine El Amine Madjet, Asma Marzouk, El Tayeb Bentria, Stefano Sanvito, Sabre Kais, Fahhad Hussain Al Harbi
Hybrid organic-inorganic frameworks provide numerous combinations of materials with a wide range of structural and electronic properties, which enable their use in various applications. In recent years, some of these hybrid materials (especially lead-based halide perovskites) have been successfully used for the development of highly ecient solar cells. The large variety of possible hybrid materials inspired us into the search of other organic-inorganic frameworks, which may exhibit enhanced performance when compared to conventional lead-halide perovskites...
February 5, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28161125/one-step-selective-electrokinetic-removal-of-inorganic-anions-from-small-volumes-and-its-application-as-sample-clean-up-for-mass-spectrometric-techniques
#18
Ria Marni Tubaon, Paul R Haddad, Joselito P Quirino
The presence of inorganic anions in a sample interferes with mass spectrometric (MS) analysis. Here, a simple method to remove these ions from a liquid sample in one-step is described. The inorganic anions present in a 50μL sample were extracted into a low pH solution inside a 200μm i.d.×33cm long capillary by the use of an electric field. The selective removal of unwanted anions and retention of target analytes was accomplished by control of the apparent electrophoretic velocities of anions and analytes at a boundary that separated the sample and extraction solution...
January 27, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28160416/amorphous-mixed-valence-vanadium-oxide-exfoliated-carbon-cloth-structure-shows-a-record-high-cycling-stability
#19
Yu Song, Tian-Yu Liu, Bin Yao, Tian-Yi Kou, Dong-Yang Feng, Xiao-Xia Liu, Yat Li
Previous studies show that vanadium oxides suffer from severe capacity loss during cycling in the liquid electrolyte, which has hindered their applications in electrochemical energy storage. The electrochemical instability is mainly due to chemical dissolution and structural pulverization of vanadium oxides during charge/discharge cyclings. In this study the authors demonstrate that amorphous mixed-valence vanadium oxide deposited on exfoliated carbon cloth (CC) can address these two limitations simultaneously...
February 3, 2017: Small
https://www.readbyqxmd.com/read/28158931/breathing-motion-of-a-modulable-molecular-cavity
#20
Alexandre Martinez, Dawei Zhang, Laure Guy, Jean-Pierre Dutasta, James Robert Cochrane, Sebastiano Di Pietro, Heinz Gornitzka
A class of hemicryptophane cages that adopt imploded conformations in solution and in the solid state is described and studied by NMR and X-ray crystallography. We show that the degree of collapse of the molecular cavity can be controlled by changing the stereochemistry of the chiral elements of the hemicryptophanes, leading to a modulation of their physical and chemical properties. Upon the binding of an oxidovanadium unit, the collapsed molecular cavity can inflate to give an expanded conformation. Removal of the vanadium core by an ancillary complexing ligand restores the initial folded structure...
February 3, 2017: Chemistry: a European Journal
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