Mobility and in situ aggregation of charged microparticles at oil-water interfaces

Sowmitri Tarimala, Srinivas R. Ranabothu, Jeremy P. Vernetti, Lenore L. Dai

Research output: Contribution to journalArticle

58 Scopus citations

Abstract

Particle mobility, aggregate structure, and the mechanism of aggregate growth at the two-dimensional level have been of long-standing interest. Here, we use solid-stabilized emulsions as a model system to investigate the mobility of charged microparticles at poly(dimethylsiloxane) (oil)-water interfaces using confocal laser scanning microscopy. Remarkably, the rate of diffusion of the charged colloidal-sized polystyrene particles at the oil-water interface is only moderately slower than that in the bulk water phase. The ambient diffusion constant of solid particles is significantly reduced from 1.1 × 10 -9 cm 2/s to 2.1 × 10 -11 cm 2/s when the viscosity of the oil phase increases from 5 cSt to 350 cSt. In addition, we successfully observe the in situ structural formation of solid particles at the oil-water interface.

Original languageEnglish (US)
Pages (from-to)5171-5173
Number of pages3
JournalLangmuir
Volume20
Issue number13
DOIs
StatePublished - Jun 22 2004
Externally publishedYes

ASJC Scopus subject areas

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

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