Osmotic manipulation of particles for microfluidic applications

Details Osmotic manipulation of particles for microfluidic applications Osmotic manipulation of particles for microfluidic applications

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009njph...11g5022a&link_type=abstract

New Journal of Physics, Volume 11, Issue 7, pp. 075022 (2009).

Physics

3

Scientific paper

Diffusiophoresis, i.e. the movement of macromolecules along a molecular gradient, is shown to be an efficient means to drive particles in microchannels. By using a generic microfluidic setup, we assess the displacement of silica particles under a controlled salt gradient and provide experimental evidence for a strongly enhanced migration process, the amplitude of which depends on the nature of the salt. A theoretical description shows quantitative agreement with the observed experimental features. Furthermore, we describe a set of microfluidic operations such as separation, sorting or focusing of a colloidal assembly which can be efficiently performed using diffusiophoresis.

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