Phase behavior, 3-D structure, and rheology of colloidal microsphere-nanoparticle suspensions

Summer K. Rhodes, Jennifer A. Lewis

Research output: Contribution to journalArticlepeer-review

Abstract

A new route for tailoring the behavior of colloidal suspensions through nanoparticle additions is reviewed. Specifically, the interparticle interactions, phase behavior, 3-D structure, and rheological properties of microsphere-nanoparticle mixtures that possess both high charge and size asymmetry are described. Negligibly charged microspheres, which flocculate when suspended alone, undergo a remarkable stabilizing transition upon the addition of highly charged nanoparticles. The formation of a dynamic nanoparticle halo around each colloid induces an effective repulsion between the microspheres that promotes their stability. With increasing nanoparticle concentration, the colloids again undergo flocculation because of the emergence of an effective microsphere attraction, whose magnitude exhibits a quadratic dependence on nanoparticle volume fraction. The broader impact of these observations on colloidal stabilization and assembly of advanced ceramics is highlighted.

Original languageEnglish (US)
Pages (from-to)1840-1846
Number of pages7
JournalJournal of the American Ceramic Society
Volume89
Issue number6
DOIs
StatePublished - Jun 2006

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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