AAAR 31st Annual Conference
October 8-12, 2012
Hyatt Regency Minneapolis
Minneapolis, Minnesota, USA
Abstract View
Characteristics of Nano-Particle Deposition in an Air-Liquid System
KARI KUUSPALO, Ari Leskinen, Heidi Niskanen, Pasi, I Jalava, Tiina Torvela, Stefanie Kasurinen, Maija-Riitta Hirvonen, Kari Lehtinen, Jorma Jokiniemi, University of Eastern Finland, Kuopio, Finland
Abstract Number: 324 Working Group: Instrumentation and Methods
Abstract The Air Liquid system manufactured by Vitrocell Systems GmbH represents a promising way to realistically investigate the toxicity of airborne particles from different sources. The corner stone of any aerosol toxicity investigation is the dose quantification. For larger particles a quartz crystal microbalance positioned in an exposure chamber is an adequate way, but for nano-sized particles the sensitivity of microbalance can be insufficient and more detailed analysis is needed.
A tube furnace system was used to produce single mode median size of 20 nm polydisperse Ag/Ag2O-particles to investigate the particle deposition and behavior in the Vitrocell system.
The produced aerosol number size distribution was monitored online at the entrance of Vitrocell sampling system with Scanning Mobility Particle Sizer (SMPS). Diffusional losses in the Vitrocell sampling inlets were calculated and verified by means of Transmission Electron Microscopy (TEM). Deposition and the size distribution at the target area were also investigated with TEM.
In order to quantify which particles deposit to the cells and which not we have developed a particle deposition model into the commercial CFD code CFX. With the model, in addition to obtaining the detailed flow patterns in the Vitrocell, we obtain the deposition efficiency as a function of particle size.