Does Thermophoretic Mobility Depend on Particle Size?

by: Marco Braibanti, Daniele Vigolo, Roberto Piazza

Physical Review Letters, Vol. 100, No. 10. (2008)

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Abstract

Thermophoresis is particle drift induced by a temperature gradient. By measuring the full temperature dependence of this effect for polystyrene latex suspensions, we show that the thermophoretic mobility (or “thermal diffusion coefficient”) DT is basically independent on particle size, in particular, when the interfacial properties of the colloidal particles are carefully standardized by adsorbing a surfactant layer on the particle surface. Even more, all investigated systems show values of DT which are very close to those measured for simple micellar solutions of the adsorbed surfactant. Our findings could be of relevance for downsizing microfluidics to the nanometric range.

@article{citeulike:2547842, abstract = {Thermophoresis is particle drift induced by a temperature gradient. By measuring the full temperature dependence of this effect for polystyrene latex suspensions, we show that the thermophoretic mobility (or \“thermal diffusion coefficient\”) DT is basically independent on particle size, in particular, when the interfacial properties of the colloidal particles are carefully standardized by adsorbing a surfactant layer on the particle surface. Even more, all investigated systems show values of DT which are very close to those measured for simple micellar solutions of the adsorbed surfactant. Our findings could be of relevance for downsizing microfluidics to the nanometric range.}, author = {Braibanti, Marco and Vigolo, Daniele and Piazza, Roberto }, citeulike-article-id = {2547842}, doi = {10.1103/PhysRevLett.100.108303}, journal = {Physical Review Letters}, keywords = {2008, diffusion, dynamics}, number = {10}, posted-at = {2008-03-17 22:31:54}, priority = {2}, publisher = {APS}, title = {Does Thermophoretic Mobility Depend on Particle Size?}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRLTAO000100000010108303000001\&idtype=cvips\&gifs=yes}, volume = {100}, year = {2008} }

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TY - JOUR ID - citeulike:2547842 L3 - citeulike-article-id:2547842 TI - Does Thermophoretic Mobility Depend on Particle Size? JF - Physical Review Letters VL - 100 IS - 10 PB - APS N2 - Thermophoresis is particle drift induced by a temperature gradient. By measuring the full temperature dependence of this effect for polystyrene latex suspensions, we show that the thermophoretic mobility (or “thermal diffusion coefficient”) DT is basically independent on particle size, in particular, when the interfacial properties of the colloidal particles are carefully standardized by adsorbing a surfactant layer on the particle surface. Even more, all investigated systems show values of DT which are very close to those measured for simple micellar solutions of the adsorbed surfactant. Our findings could be of relevance for downsizing microfluidics to the nanometric range. KW - 2008 KW - diffusion KW - dynamics AU - Braibanti, Marco AU - Vigolo, Daniele AU - Piazza, Roberto PY - 2008/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000100000010108303000001&idtype=cvips&gifs=yes ER -

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