Clusters and gels in systems of sticky particles

H Sedgwick, S U Egelhaaf, Wilson Poon

Research output: Contribution to journalArticlepeer-review

Abstract

We studied clustering and gelation in low-volume-fraction (phi less than or similar to 0.2) hard-sphere colloids, some with charge, with added non-adsorbing polymers. The range of the effective 'depletion' attraction induced by the polymers between the particles is greater than or similar to2% of the particles' diameter. The effects of density mismatch between the particles and the solvent and unscreened charges on the particles were investigated. The onset of aggregation and gelation in a neutral, density-matched system is discussed in terms of mode-coupling theory (MCT) and a recent 'renormalized' version of MCT respectively. Gravity causes sedimentation of growing clusters and shifts the gelation boundary. In the charged and density-matched system, a 'cluster phase' in which finite-size aggregates 'coexisted' with monomers occurred before gelation. Its origins remain unclear.

Original languageEnglish
Pages (from-to)S4913-S4922
Number of pages10
JournalJournal of Physics: Condensed Matter
Volume16
Issue number42
DOIs
Publication statusPublished - 27 Oct 2004

Keywords

  • COLLOIDAL-GELATION
  • MODEL SYSTEM
  • TRANSITIONS
  • MIXTURES

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