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

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

Research output: Contribution to journalArticle

57 Citations (Scopus)

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

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microparticles
Oils
Agglomeration
oils
Water
water
Polystyrenes
Polydimethylsiloxane
Emulsions
emulsions
polystyrene
Microscopic examination
Viscosity
viscosity
microscopy
Scanning
scanning
Lasers
lasers

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Mobility and in situ aggregation of charged microparticles at oil-water interfaces. / Tarimala, Sowmitri; Ranabothu, Srinivas R.; Vernetti, Jeremy P.; Dai, Lenore.

In: Langmuir, Vol. 20, No. 13, 22.06.2004, p. 5171-5173.

Research output: Contribution to journalArticle

Tarimala, Sowmitri ; Ranabothu, Srinivas R. ; Vernetti, Jeremy P. ; Dai, Lenore. / Mobility and in situ aggregation of charged microparticles at oil-water interfaces. In: Langmuir. 2004 ; Vol. 20, No. 13. pp. 5171-5173.
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