Key role of hydrodynamic interactions in colloidal gelation

Colloidal gelation is caused by the formation of a percolated network of colloidal particles suspended in a liquid. Thus far the major transport process leading to gelation has been believed to be the brownian diffusion of particles. Contrary to this common belief, we reveal by numerical simulations...

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Bibliographic Details
Published inPhysical review letters Vol. 104; no. 24; p. 245702
Main Authors Furukawa, Akira, Tanaka, Hajime
Format Journal Article
LanguageEnglish
Published United States 15.06.2010
Subjects
Biological Transport
Colloids - chemistry
Diffusion
Gels - chemistry
Hydrodynamics
Models, Biological
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Summary:Colloidal gelation is caused by the formation of a percolated network of colloidal particles suspended in a liquid. Thus far the major transport process leading to gelation has been believed to be the brownian diffusion of particles. Contrary to this common belief, we reveal by numerical simulations that many-body hydrodynamic interactions between colloidal particles also play an essential role in gelation: They significantly promote gelation, or lower the colloid volume fraction threshold for percolation, as compared to their absence. We find that the incompressible nature of a liquid component and the resulting self-organization of hydrodynamic flow with a transverse (rotational) character are responsible for this enhancement of network-forming ability.
ISSN:1079-7114
DOI:10.1103/physrevlett.104.245702