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

Raheleh Givehchi,Zhongchao Tan,Qinghai Li

doi:10.3390/ma11081277

Raheleh Givehchi, Zhongchao Tan + Show 1 more

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https://doi.org/10.3390/ma11081277

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Abstract

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.

Highlights

There has been a growing interest in filtration of airborne nanoparticles over the last decade primarily due to the concerns over the potential negative impact of nanoparticles on human health and the environment [1,2,3]
This finding led us to revisit a possible thermal decreased as the size of nanoparticles decreased. This finding led us to revisit a possible thermal rebound that remains a debatable subject in literature
This study showed that sub-3.3 nm WOx particles smaller and larger than 1.96 nm behaved differently in air filtration

Summary

Introduction

There has been a growing interest in filtration of airborne nanoparticles over the last decade primarily due to the concerns over the potential negative impact of nanoparticles on human health and the environment [1,2,3]. Heim et al [10] showed that the filtration efficiency of sodium chloride (NaCl) nanoparticles in the range of 2.5–20 nm followed the classical single fiber-efficiency theory. Kim et al [11] tested the filtration efficiency of sub-100 nm particles and presented the independency of filtration efficiency on air humidity. They showed that the classical filtration theory agrees well with the filtration efficiency of nanoparticles down to 2 nm. Boskovic et al [12] showed the dependency of filtration efficiency of nanoparticles on the particle shape for particles ranging from 50 nm to 300 nm at the velocity of 5 cm/s in which Brownian diffusion is dominant

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