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Optimisation of a thermophoretic personal sampler for nanoparticle exposure studies

Azong-Wara, Nkwenti and Asbach, Christof and Stahlmecke, Burkhard and Fissan, Heinz and Kaminski, Heinz and Plitzko, Sabine and Kuhlbusch, Thomas A. J. (2009) Optimisation of a thermophoretic personal sampler for nanoparticle exposure studies. Journal of Nanoparticle Research, 11 (7). pp. 1611-1624.

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A new Thermal Precipitator (TP) was developed as a personal sampler for nanoparticle exposure studies. Two parallel 20-mm-long plates with different but uniform temperatures were introduced into the TP with an appropriate gap distance, to achieve a uniform temperature gradient along the length of the plates. Particles are thermophoretically deposited on the colder plate in the TP which acts as the substrate. Analytical calculations were carried out to determine an optimal plate gap distance and temperature gradient in the TP. A simulation grid was created from the resulting geometry which was used for numerical modelling with a CFD Software. Results from the simulations showed a uniform deposition of particles up to the size range of about 300 nm for a temperature gradient of 15 K/mm and a 1-mm gap distance, independent of the orientation of the TP during sampling. In contrast to the old TP where up to 32 SEM images of its non-uniform particle deposition had to be evaluated to obtain an average particle size distribution, an evaluation of the uniform deposition with the new TP is much more simplified, remarkably reducing the time and cost of the evaluation, while providing more accurate results.

Item Type:Article
Uncontrolled Keywords:Thermal precipitator - Thermophoresis - CFD - Nanoparticle exposure - Personal sampler - Particle deposition - Environment - EHS
Subjects:Technology > Nanotechnology and environmental applications
NanoSafety > Environment, health and safety aspects of nanotechnology
Biomedical Science > Nanotechnology for human health
ID Code:7696
Deposited By:Lesley Tobin
Deposited On:01 Apr 2010 13:52
Last Modified:01 Apr 2010 13:53

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