scholarly journals Small Nanosized Oxygen-Deficient Tungsten Oxide Particles: Mechanistic Investigation with Controlled Plasma Generation in Water for Their Preparation

ACS Omega ◽  
2017 ◽  
Vol 2 (8) ◽  
pp. 5104-5110 ◽  
Author(s):  
Yohei Ishida ◽  
Shingo Motono ◽  
Wataru Doshin ◽  
Tomoharu Tokunaga ◽  
Hiroki Tsukamoto ◽  
...  
Keyword(s):  
Tungsten Oxide ◽  
Plasma Generation ◽  
Mechanistic Investigation ◽  
Oxide Particles

scholarly journals Evolution of reduction process from tungsten oxide to ultrafine tungsten powder via hydrogen

2021 ◽  
Vol 40 (1) ◽  
pp. 171-177
Author(s):  
Yue Wang ◽  
Ben Fu Long ◽  
Chun Yu Liu ◽  
Gao An Lin
Keyword(s):  
Surface Morphology ◽  
Tungsten Oxide ◽  
Tungsten Powder ◽  
Reduction Process ◽  
Chemical Vapor ◽  
Transition Process ◽  
Vapor Transport ◽  
Fibrous Structure ◽  
Chemical Vapor Transport ◽  
Oxide Particles

Abstract Herein, the evolution of reduction process of ultrafine tungsten powder in industrial conditions was investigated. The transition process of morphology and composition was examined via SEM, XRD, and calcination experiments. The results show that the reduction sequence of WO2.9 was WO2.9 → WO2.72 → WO2 → W on the surface, but WO2.9 → WO2 → W inside the oxide particles. With the aid of chemical vapor transport of WO x (OH) y , surface morphology transformed into rod-like, star-shaped cracking, floret, irregularly fibrous structure, and finally, spherical tungsten particles.

Physical and Biophysical Characteristics of Nanoscale Tungsten Oxide Particles and Their Interaction with Human Genomic DNA

2011 ◽  
Vol 11 (6) ◽  
pp. 4659-4666 ◽  
Author(s):  
Vijay Bhooshan Kumar ◽  
Clara Ermine Sawian ◽  
Dambarudhar Mohanta ◽  
Shashi Baruah ◽  
NashreenS. Islam
Keyword(s):  
Tungsten Oxide ◽  
Genomic Dna ◽  
Oxide Particles ◽  
Human Genomic ◽  
Human Genomic Dna

OS1406-341 Nanocrystalline Nickel Dispersed with Hydrolyzed Nano-Size Tungsten Oxide Particles by Electrodeposition

2015 ◽  
Vol 2015 (0) ◽  
pp. _OS1406-34-_OS1406-34
Author(s):  
Tomoki MIFUNE ◽  
Hiroyuki MIYAMOTO ◽  
Hiroshi FUJIWARA ◽  
Takuya GOTO
Keyword(s):  
Tungsten Oxide ◽  
Nanocrystalline Nickel ◽  
Oxide Particles ◽  
Nano Size

Generation and characterization of nano tungsten oxide particles by wire explosion process

2011 ◽  
Vol 62 (2) ◽  
pp. 248-255 ◽  
Author(s):  
S. Aravinth ◽  
Binu Sankar ◽  
S.R. Chakravarthi ◽  
R. Sarathi
Keyword(s):  
Tungsten Oxide ◽  
Wire Explosion ◽  
Explosion Process ◽  
Oxide Particles

scholarly journals Получение наноразмерных порошков оксида вольфрама и вольфрама

2019 ◽  
Vol 61 (1) ◽  
pp. 163
Author(s):  
Х.А. Абдуллин ◽  
А.А. Азаткалиев ◽  
М.Т. Габдуллин ◽  
Ж.К. Калкозова ◽  
Б.Н. Мукашев ◽  
...  
Keyword(s):  
Tungsten Oxide ◽  
Low Frequency ◽  
Synthesis Temperature ◽  
Thermal Reduction ◽  
Electrochemical Characteristics ◽  
X Ray Diffraction ◽  
Fibrous Matrix ◽  
Oxide Particles ◽  
Tungsten Oxide Film ◽  
Tungsten Nanoparticles

AbstractNanopowder tungsten oxide and metallic tungsten are obtained via pyrolysis of ammonium metatungstate. Two methods are used for the synthesis of tungsten oxide: the use of a fibrous matrix and pyrolysis of aerosol particles. Tungsten oxide particles are formed during the pyrolysis in air. Metallic tungsten nanoparticles are obtained via subsequent thermal reduction of tungsten oxide in hydrogen. The structure and morphology of the samples are studied with X-ray diffraction and scanning electron microscopy. Tungsten nanopowders with average sizes from 7 to 30 nm are obtained depending on synthesis temperature. The electrochemical characteristics of electrodes coated with tungsten nanoparticles are studied with cyclic voltammetry, impedance spectroscopy, and galvanostatic charge–discharge methods. An electrode with W nanoparticles exhibited a specific low-frequency capacitance of about 90 F/g due to thin tungsten oxide film on the surface of tungsten nanoparticles.

scholarly journals Filtration of Sub-3.3 nm Tungsten Oxide Particles Using Nanofibrous Filters

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1277
Author(s):  
Raheleh Givehchi ◽  
Qinghai Li ◽  
Zhongchao Tan
Keyword(s):  
Relative Humidity ◽  
Polyvinyl Alcohol ◽  
Tungsten Oxide ◽  
Particle Concentration ◽  
Size Range ◽  
Filtration Efficiency ◽  
Fibrous Filters ◽  
Oxide Particles

This work aims to understand the effects of particle concentration on the filtration of nanoparticles using nanofibrous filters. The filtration efficiencies of triple modal tungsten oxide (WOx) nanoparticles were experimentally determined at three different concentrations for the size range of 0.82–3.3 nm in diameter. All tests were conducted using polyvinyl alcohol (PVA) nano-fibrous filters at an air relative humidity of 2.9%. Results showed that the filtration efficiencies of sub-3.3 nm nanoparticles depended on the upstream particle concentration. The lower the particle concentration was, the higher the filtration efficiency was.

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