Nanoparticle engineering of complex fluid behavior

Valeria Tohver, Angel Chan, Osamu Sakurada, Jennifer A. Lewis

Research output: Contribution to journalArticlepeer-review


A new mechanism for regulating the stability of colloidal suspensions has been discovered, known as nanoparticle haloing. 1 Colloidal microspheres suspended under conditions near their isoelectric point were stabilized by the addition of highly charged nanoparticles. Such species segregated to regions near negligibly charged microspheres leading to their effective charge buildup. At even higher nanoparticle volume fractions, system stability was reversed due to attractive depletion interactions. By engineering the strength of energetic and entropic interactions via nanoparticle additions, we have assembled colloidal fluid, gel, and crystalline phases from binary mixtures of colloidal silica microspheres and hydrous zirconia nanoparticles whose structure and flow behavior vary dramatically.

Original languageEnglish (US)
Pages (from-to)8414-8421
Number of pages8
Issue number26
StatePublished - Dec 25 2001

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry


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