Electrostatically tuned interactions in silica microsphere-polystyrene nanoparticle mixtures

Angel T. Chan, Jennifer A. Lewis

Research output: Contribution to journalArticlepeer-review


We explore the generality of nanoparticle haloing1 as a novel colloidal stabilization mechanism in binary mixtures of silica microspheres and polystyrene nanoparticles. By selectively tuning their electrostatic interactions, both the initial microsphere stability and the role of nanoparticle additions are varied. Adsorption isotherm and zeta potential measurements indicate that highly charged nanoparticles exhibit a weak (haloing) association with negligibly charged microspheres, whereas they either strongly adsorb onto oppositely charged or are repelled by like-charged microsphere surfaces, respectively. Bulk sedimentation and confocal scanning fluorescence microscopy reveal that important differences in system stability emerge depending on whether the added nanoparticles serve as haloing, bridging, or depletant species.

Original languageEnglish (US)
Pages (from-to)8576-8579
Number of pages4
Issue number19
StatePublished - Sep 13 2005
Externally publishedYes

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry


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