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Cinétiques de concentration de suspensions colloïdales par évaporation microfluidique : de la solution diluée aux cristaux colloïdaux

Abstract : This work is devoted to studying processes of colloidal solutions concentration by microfluidic way to shape dense and organized states. Using a tool based on the water permeation through the PDMS: the microevaporator, we propose to control drying of solution for controlling solute concentration to form dense states as one chooses, alternating crystals and amorphous states of colloids. By adapting microevaporation tool at different observation techniques, nucleation and growth are particularly studied and correlated to a simple microevaporation model. This experimental work demonstrates the good control on kinetics of chemical species concentration offered by microevaporation, in order to shape dense states of particles. Further studies also reveal existence of a dynamic construction of colloidal crystal with some reorganization in the front growth and a compaction effect of the dense state during the growth.
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Submitted on : Wednesday, February 9, 2011 - 4:40:51 PM
Last modification on : Thursday, January 11, 2018 - 6:22:07 AM
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Aurore Merlin. Cinétiques de concentration de suspensions colloïdales par évaporation microfluidique : de la solution diluée aux cristaux colloïdaux. Matière Condensée [cond-mat]. Université de Bordeaux 1, 2010. Français. ⟨tel-00564692⟩

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