Hydrodynamics in bridging and aggregation of two colloidal particles in a near-critical binary mixture

Shunsuke Yabunaka, Ryuichi Okamoto, Akira Onuki

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We investigate bridging and aggregation of two colloidal particles in a near-critical binary mixture when the fluid far from the particles is outside the coexistence (CX) curve and is rich in the component disfavored by the colloid surfaces. In such situations, the adsorption-induced interaction is enhanced, leading to bridging and aggregation of the particles. We realize bridging firstly by changing the temperature with a fixed interparticle separation and secondly by letting the two particles aggregate. The interparticle attractive force dramatically increases upon bridging. The dynamics is governed by hydrodynamic flow around the colloid surfaces. In aggregation, the adsorption layers move with the particles and squeezing occurs at narrow separation. These results suggest relevance of bridging in the reversible colloid aggregation observed so far. We use the local functional theory [J. Chem. Phys., 2012, 136, 114704] to take into account the renormalization effect and the simulation method [Phys. Rev. Lett., 2000, 85, 1338] to calculate the hydrodynamic flow around the colloidal particles.

Original languageEnglish
Pages (from-to)5738-5747
Number of pages10
JournalSoft Matter
Volume11
Issue number28
DOIs
Publication statusPublished - Jul 28 2015
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Hydrodynamics in bridging and aggregation of two colloidal particles in a near-critical binary mixture'. Together they form a unique fingerprint.

  • Cite this