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Qi Hao, Wan Li, Huiyan Xu, Jiawei Wang, Yin Yin, Huaiyu Wang, Libo Ma, Fei Ma, Xuchuan Jiang, Oliver G Schmidt, Paul K Chu
Vanadium dioxide/titanium nitride (VO2 /TiN) smart coatings are prepared by hybridizing thermochromic VO2 with plasmonic TiN nanoparticles. The VO2 /TiN coatings can control infrared (IR) radiation dynamically in accordance with the ambient temperature and illumination intensity. It blocks IR light under strong illumination at 28 °C but is IR transparent under weak irradiation conditions or at a low temperature of 20 °C. The VO2 /TiN coatings exhibit a good integral visible transmittance of up to 51% and excellent IR switching efficiency of 48% at 2000 nm...
January 19, 2018: Advanced Materials
Muhammad Rashad, Hongzhang Zhang, Muhammad Asif, Kai Feng, Xianfeng Li, Huamin Zhang
Potentially safe and economically feasible magnesium batteries (MBs) have attracted tremendous research attention as an alternative to high cost and unsafe lithium ion batteries (LIBs). In current work, for the first time, we report a novel room temperature approach to dope atomic species sodium between the vanadium oxide crystal lattice to obtain NaV3O8.1.69H2O (NVO) nanobelts. Synthesized NVO nanobelts are used as electrode material for MBs. The MBs cells demonstrate stable discharge specific capacity of 110 mA h g-1 at a current density of 10 mA g-1 and a high cyclic stability i...
January 18, 2018: ACS Applied Materials & Interfaces
Yunxia Song, Min Luo, Fei Liang, Ning Ye, Zheshuai Lin
Molecular construction with π-conjugated groups is a favorable strategy to discover superior nonlinear optical (NLO) materials. Herein, a novel vanadium-carbonate compound K3[V(O2)2O]CO3 (KVCO), which combines two different π-orbital groups, delocalized (CO3)2- π-orbital groups and localized (O2)2- π-orbital groups, was synthesized. Benefiting from the well-arranged [V(O2)2OCO3] unit and dual-synergistic π-d-π interaction, KVCO has the largest second harmonic generation (SHG) effect (about 20 times that of KDP) among the current carbonate NLO materials...
January 17, 2018: Chemical Communications: Chem Comm
Laurent Liardet, Xile Hu
The water-splitting reaction provides a promising mechanism to store renewable energies in the form of hydrogen fuel. The oxidation half-reaction, the oxygen evolution reaction (OER), is a complex four-electron process that constitutes an efficiency bottleneck in water splitting. Here we report a highly active OER catalyst, cobalt vanadium oxide. The catalyst is designed on the basis of a volcano plot of metal-OH bond strength and activity. The catalyst can be synthesized by a facile hydrothermal route. The most active pure-phase material (a-CoVO x ) is X-ray amorphous and provides a 10 mA cm-2 current density at an overpotential of 347 mV in 1 M KOH electrolyte when immobilized on a flat substrate...
January 5, 2018: ACS Catalysis
Homan Nourbaghaee, Ahmad Ghaderi Hamidi, Mahdi Pourabdoli
Boiler residue (BR) of thermal power plants is one of the important secondary sources for vanadium production. In this research, the aluminothermic self-propagating high-temperature synthesis (SHS) was used for recovering the transition metals of BR for the first time. The effects of extra aluminum as reducing agent and flux to aluminum ratio (CaO/Al) were studied and the efficiency of recovery and presence of impurities were measured. Aluminothermic reduction of vanadium and other metals was carried out successfully by SHS without any foreign heat source...
January 8, 2018: Waste Management
Markus Joos, Giacomo Cerretti, Igor Veremchuk, Patrick Hofmann, Hajo Frerichs, Dalaver H Anjum, Tobias Reich, Ingo Lieberwirth, Martin Panthöfer, Wolfgang G Zeier, Wolfgang Tremel
The Magnéli phase V6O11 was synthesized in gram amounts from a powder mixture of V6O11/V7O13 and vanadium metal, using the spark plasma sintering (SPS) technique. Its structure was determined with synchrotron X-ray powder diffraction data from a phase-pure sample synthesized by conventional solid-state synthesis. A special feature of Magnéli-type oxides is a combination of crystallographic shear and intrinsic disorder that leads to relatively low lattice thermal conductivities. SPS prepared V6O11 has a relatively low thermal conductivity of κ = 2...
January 11, 2018: Inorganic Chemistry
Hao Peng, Zuohua Liu, Changyuan Tao
Hydrogen peroxide as an oxidant was applied in leaching of vanadium and chromium in concentrated NaOH solution. Under the optimal reaction conditions (the liquid to solid ratio of 4.0 ml/g, residue particle size of <200 mesh, the mass ratio of NaOH-to-residue of 1.0 g/g, the volume ratio of H2O2-to-residue of 1.2 ml/g, reaction temperature of 90 °C and reaction time of 120 min), the leaching efficiency of vanadium and chromium could reach up to 98.60% and 86.49%, respectively. Compared with the current liquid-phase oxidation technologies, the reaction temperature was 90-310 °C lower, and the NaOH concentration of the reaction medium is lower by more than 50 wt% (the mass ratio of NaOH-to-residue of 1...
January 11, 2018: Scientific Reports
Carmen Rubio, Laura Acosta, Gara Luis-González, Dailos González-Weller, Consuelo Revert, Arturo Hardisson, Ángel Gutiérrez
The levels of 20 metals (aluminum, boron, barium, calcium, cadmium, cobalt, chromium, copper, iron, potassium, lithium, magnesium, manganese, molybdenum, sodium, nickel, lead, strontium, vanadium, and zinc) were analyzed in muscle and liver tissue of Trachurus picturatus marketed in the Canary Islands (Spain) by using inductively coupled plasma optical emission spectrometry. In the liver samples, the mean concentrations in milligrams per kilogram wet weight (wt) of Al (14.7), B (0.99), Ba (1.64), Ca (314), Cd (2...
January 10, 2018: Journal of Food Protection
Daxiang Gui, Xing Dai, Tao Zheng, Xiangxiang Wang, Mark A Silver, Lanhua Chen, Chao Zhang, Juan Diwu, Ruhong Zhou, Zhifang Chai, Shuao Wang
The first heterobimetallic uranium(IV)/vanadium(III) phosphite compound, Na2UV2(HPO3)6 (denoted as UVP), was synthesized via an in situ redox-active hydrothermal reaction. It exhibits superior hydrolytic and antioxidant stability compared to the majority of structures containing low-valent uranium or vanadium, further elucidated by first-principles simulations, and therefore shows potential applications in nuclear waste management.
January 10, 2018: Inorganic Chemistry
Shengxiang Wang, Lei Kang, Douglas H Werner
Compared with natural materials, chiral metamaterials have been demonstrated with orders of magnitude stronger chiroptical response, which provides the basis for applications such as ultracompact polarization components and plasmonic-enhanced biosensing. Terahertz chiral metamaterials that allow dynamic polarization control of terahertz waves are of great practical interest, but remain extremely rare. Here, we show that hybrid metamaterials integrated with vanadium dioxide (VO2) exhibiting phase transition can enable dynamically tunable chiroptical responses at terahertz frequencies...
January 9, 2018: Scientific Reports
Olaf Nachtigall, Johann Spandl
We report the synthesis, post-functionalization, and redox behavior of the two organically functionalized aggregates [V6O7(OMe)9(OCH2)3C-CH2N3] and [V6O7(OMe)9(OCH2)3C-NH2]. All twelve µ2-oxo groups on the edges of the Lindqvist-type {V6O19} core were replaced by alkoxo ligands. The absence of a negative charge and the closed organic shell make these neutral mixed-valence compounds very stable towards hydrolysis and well soluble in almost all common organic solvents. These are important advantages over classical POMs...
January 4, 2018: Chemistry: a European Journal
I Sugiyama, A E Williams-Jones
The ability to accurately determine the metal content of crude oils is necessary for reasons ranging from the need to identify the source of the oils (Ni and V) to removing components that might inhibit catalysis during refining or impact negatively on the environment during hydrocarbon combustion. Here we show that ashing followed by chemical oxidation and acid digestion, coupled with ICP-MS analysis, provides an accurate method for determining the concentration of metals in crude oil. Nickel and vanadium concentrations were measured in certified Ni and V oil standards and in various light, intermediate and heavy crude oils after application of a single vessel ashing-chemical oxidation-acid digestion sample preparation and storing technique...
March 9, 2018: Analytica Chimica Acta
Qingjing Peng, Langbo Yi, Lulu Zhou, Qingzhong Peng
Pseudomonas chlororaphis strain L19, isolated from stone coal soil, has the ability to perform bioleaching to release vanadium ions from mineral ore. Here, we report the draft genome sequence and annotation of the vanadium-leaching bacterium Pseudomonas chlororaphis L19. These data provide information for understanding the genomic properties and mineral bioleaching mechanisms of strain L19.
January 4, 2018: Genome Announcements
R Bruce King
The vanadium-vanadium interactions in the polygonal aggregates of d¹ vanadium(IV) atoms, with a total of 4k + 2 vanadium electrons (k an integer) imbedded in an electronically inactive borate matrix in certain vanadoborate structures are analogous to the ring carbon-carbon interactions in diamagnetic planar cyclic hydrocarbons. They thus represent a high-spin analogue of aromaticity. Thus, the vanadoborate anion [V₆B20O50H₈]8- with six V(IV) electrons (i.e., 4k + 2 for k = 1) contains a macrohexagon of d¹ V(IV) atoms with four unpaired electrons...
December 23, 2017: Materials
Caglar Yilgor, Ayaz Efendiyev, Filiz Akbiyik, Gokhan Demirkiran, Alpaslan Senkoylu, Ahmet Alanay, Muharrem Yazici
BACKGROUND: Metal ions released from spinal instruments can cause localized debris and distribute systemically to settle on distant organs. Children with early-onset deformities live with metallic implants for a substantial amount of time. No research focused on metal distribution in growth-friendly instrumentations. The aim of this study was to compare age-matched growing rod (GR) and magnetically controlled growing rod (MCGR) groups to noninstrumented controls. METHODS: The study was designed as a multicenter, prospective, cross-sectional case series...
January 2018: Spine Deformity
Gianluigi Maria Lo Dico, Fabio Galvano, Giacomo Dugo, Carlo D'ascenzi, Andrea Macaluso, Antonio Vella, Giuseppe Giangrosso, Gaetano Cammilleri, Vincenzo Ferrantelli
The Commission Regulation (EC) Regulation N. 488/2014, established the concentration limits for cadmium in specific products based on cocoa and chocolate products as from January 2019. Based on this information there is a need to determine ultratrace levels of elements that might be presents in cocoa and chocolate products. In this work, the concentrations of Arsenic, Antimony, Cadmium, Chromium, Lead, Selenium and Vanadium were evaluated in cocoa powder and chocolate by the validation of an ICP-MS method. Good selectivity/specificity, recovery, repeatability and within-laboratory reproducibility, LOD, LOQ, range of linearity, standard measurement uncertainty parameters for method validation were achieved, in accordance with Commission Regulation...
April 15, 2018: Food Chemistry
Patricio Gonzalez-Navarrete, Juan Andrés, Monica Calatayud
A detailed density functional theory study is presented to clarify the mechanistic aspects of the methanol, CH3OH, dehydrogenation process to yield hydrogen, H2, and formaldehyde, CH2O. A gas-phase vanadium oxide cluster is used as a model system to represent reduced V (III) oxides supported on TiO2 catalyst. The theoretical results provide a complete scenario, involving several reaction pathways where different methanol adsorption sites are considered, with presence of hydride and methoxide intermediates. Methanol dissociative adsorption process is both kinetically and thermodynamically feasible on V-O-Ti and V=O sites, and it might lead to form hydride species with interesting catalytic reactivity...
December 29, 2017: Journal of Physical Chemistry. A
Kenichi Kobayashi, Risako Kunimura, Hirokazu Takagi, Misaki Hirai, Hiroshi Kogen, Hiroshi Hirota, Chiaki Kuroda
The relative and absolute configurations of an oxygenated bisabolane natural product, isolated from L. lankongensis, were determined by synthesis. All four possible stereoisomers and their tiglate analogues were synthesized from R-(-)-carvone, and their 1H and 13C NMR spectra were compared to establish the 6R,8S,10S configuration. The stereoselective synthesis of the natural product was also achieved, featuring Brown allylation, vanadium-catalyzed epoxidation, and the Mitsunobu reaction.
December 28, 2017: Journal of Organic Chemistry
Matteo Atzori, Stefano Benci, Elena Morra, Lorenzo Tesi, Mario Chiesa, Renato Torre, Lorenzo Sorace, Roberta Sessoli
Control of spin-lattice magnetic relaxation is crucial to observe long quantum coherence in spin systems at reasonable temperatures. Such a control is most often extremely difficult to achieve, because of the coexistence of several relaxation mechanisms, that is direct, Raman, and Orbach. These are not always easy to relate to the energy states of the investigated system, because of the contribution to the relaxation of additional spin-phonon coupling phenomena mediated by intramolecular vibrations. In this work, we have investigated the effect of slight changes on the molecular structure of four vanadium(IV)-based potential spin qubits on their spin dynamics, studied by alternate current (AC) susceptometry...
December 27, 2017: Inorganic Chemistry
B F Parker, Z Zhang, L Rao, J Arnold
This review provides a brief background on the extraction of uranium from seawater as well as recent work by the United States Department of Energy on this project. The world's oceans contain uranium at 3 parts per billion, and despite this low concentration, there has been historical interest in harvesting it, mainly in Japan in the 1980s and the United States in this decade. Improvements in materials, chemistry, and deployment methods have all been made, with the ultimate goal of lower cost. This has been partially realized, dropping from approximately $2000 per kg U3O8 extracted in 1984 to $500 per kg today, although this is not yet competitive with terrestrial uranium...
December 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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