Probing Colloidal Gels at Multiple Length Scales: The Role of Hydrodynamics

C. Patrick Royall, Jens Eggers, Akira Furukawa, Hajime Tanaka

Research output: Contribution to journalArticle (Academic Journal)peer-review

30 Citations (Scopus)
294 Downloads (Pure)

Abstract

Colloidal gels are out-of-equilibrium structures, made up of a rarefied network of colloidal particles. Comparing experiments to numerical simulations, with hydrodynamic interactions switched off, we demonstrate the crucial role of the solvent for gelation. Hydrodynamic interactions suppress the formation of larger local equilibrium structures of closed geometry, and instead lead to the formation of highly anisotropic threads, which promote an open gel network. We confirm these results with simulations which include hydrodynamics. Based on three-point correlations, we propose a scale-resolved quantitative measure for the anisotropy of the gel structure. We find a strong discrepancy for interparticle distances just under twice the particle diameter between systems with and without hydrodynamics, quantifying the role of hydrodynamics from a structural point of view.

Original languageEnglish
Article number258302
Number of pages5
JournalPhysical Review Letters
Volume114
Issue number25
DOIs
Publication statusPublished - 24 Jun 2015

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