10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
Abstract View
A Shaker Fluidized-bed Atomizer (SFA) for Nanopowder Dispersion with Stable Aerosol Concentrations
CHI-YU TIEN, Wen-Cheng Gong, Chuen-Jinn Tsai, National Chiao Tung University
Abstract Number: 138 Working Group: Instrumentation
Abstract This study aims to develop a nanopowder disperser to generate aerosols with stable concentrations in long period of time. The home-made nanopowder disperser, called shaker fluidized-bed atomizer (SFA), consists of a dry aerosol atomizer, a nanopowder fluidization chamber and air-flow distributor. At the nanopowder fluidization chamber, 1 g of tested powder is placed. The main function of the air-flow distributor is to make sure the bulk nanopowder is fluidized and aerosols are suspended in the chamber uniformly. The suspended particles are sucked into the atomizer at the top of the chamber and de-agglomerated by high velocity jet from the critical orifice. As a result well-dispersed fine particles are generated. The size and mass distributions of dispersed particles were analyzed using SMPS and NCTU micro-orifice cascade impactor (NMCI), respectively, and particle morphology was observed by the TEM.
The results showed that the multi-wall carbon nanotube (MWCNT) aerosols dispersed by the SFA was stable in number, mass and surface area concentrations during 8-hr period. Both the size and mass showed the bimodal distributions with the mode diameter 165 and 453 nm, and MMAD of 0.18 and 1.28 µm, respectively. The TEM images displayed that MWCNT particles collected on the lower stage impactor were well dispersed and showed single-fiber like structure. Different kinds of nanopowders will also be tested in the future for further accessing the performance of the SFA.