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.

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.

Relative Humidity Sensor Based on Tilted Fiber Bragg Grating With Polyvinyl Alcohol Coating

2009 ◽  
Vol 21 (7) ◽  
pp. 441-443 ◽  
Author(s):  
Yinping Miao ◽  
Bo Liu ◽  
Hao Zhang ◽  
Yuan Li ◽  
Haibin Zhou ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Polyvinyl Alcohol ◽  
Fiber Bragg Grating ◽  
Humidity Sensor ◽  
Bragg Grating ◽  
Relative Humidity Sensor

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

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 Continuous and rapid fabrication of photochromic fibers by facilely coating tungsten oxide/polyvinyl alcohol composites

RSC Advances ◽  
2018 ◽  
Vol 8 (50) ◽  
pp. 28581-28587 ◽  
Author(s):  
Zhongwen Ling ◽  
Kang Liu ◽  
Qi Zou ◽  
Qingsong Li ◽  
Ke-Qin Zhang ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Tungsten Oxide ◽  
Rapid Fabrication

Photochromic fibers have attracted great attention due to their wide use in areas of military camouflage, safety warnings, anti-counterfeiting, entertainment, etc.

High-Rate Formation of Nano-Scale Alumina Particles

1991 ◽  
Vol 249 ◽  
Author(s):  
A. Kilian ◽  
L. Reinhart ◽  
A. Davis ◽  
T.F. Morse ◽  
D.C. Paine
Keyword(s):  
Size Range ◽  
High Rate ◽  
Practical Application ◽  
New Approach ◽  
Monodispersed Particles ◽  
Nano Scale ◽  
Alumina Particles ◽  
Large Production ◽  
Oxide Particles ◽  
The Ideal

ABSTRACTIn this paper we report a new approach to the problem of high rate formation of nanophase powders. In our experiments we were able to make aluminum oxide particles in the size range from 5 to 140 nm (peaking sharply at 35 nm) at a rate of 3 g/min. The starting material was a mixture of aluminum-tri-sec-butoxide and sec-butanol. An aerosol was made from this solution and subsequently burned in a special torch, described below. The resulting particles were spherical and no necked regions were observable between them. In a practical application, our technique allows a large production rate while still approaching the ideal of nano-scale monodispersed particles. The work was extended to the formation of zirconium oxide particles with quite similar results in the size distribution.

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