Particle and Aerosol Research Vol. 9, No. 4, December 2013 |
ISSN : 1738-8716 (Print) ISSN : 2287-8130 (Online) |
Development and Performance Evaluation of Aerosol Generator of MWCNTs for Inhalation Toxicology
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Abstracts
Carbon nanotubes (CNTs) are one of the nanomaterials that were discovered by Iijima in 1991 for the first time.
CNTs have long cylindrical and axi-symmetric structures. CNTs are made by rolling graphene sheets. Because of their
large length-to-diameter ratio, they are called nanotubes. CNTs are categorized as single-walled carbon nanotubes
(SWCNTs) or multi-walled carbon nanotubes (MWCNTs) based on the shell structures. CNTs are broadly used in
various fields, such as scanning probe microscopy, ultra fine nano balance and medicine, due to their extraordinary
thermal conductivity, electrical and mechanical properties. Because long, straight CNTs have the same shape as
asbestos, which cause cancer in cells lining the lung, there have been many studies on the effects of MWCNTs on
human health that have been conducted. Stable atomization of CNTs is very important for the estimation of inhalation
toxicity. In the present study, electro-static assisted axial atomizer (EAAA), which is the instrument that uses
MWCNTs and aerosolizes them by transforming the single fiber shape using ultrasonic dispersion and electric field,
was invented. EAAA consists of a ultrasonic bath for dispersion of MWCNTs and a particle generator for atomizing
single fibers. The performance evaluation was conducted in order to assess the possibilities of 6-hour straight
atomization with stability, which is the suggested exposure time in a day for the estimation of inhalation toxicity.
Keywords£ºMulti-walled carbon nanotubes, Single fiber, Aerosol generation, Electric field, Ultrasonic dispersion
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