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

Condensed Matter journal club

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

  • Event time: 11:30am
  • Event date: 13th November 2015
  • Speaker: (School of Physics & Astronomy, University of Edinburgh)
  • Location: Room 2511,

Event details

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
PRL 114 article 258302 (2015)
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Authors

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