Spontaneous oil-in-water emulsification induced by charge-stabilized dispersions of various inorganic colloids

Stefano Sacanna, W. K. Kegel, A. P. Philipse

Research output: Contribution to journalArticle

Abstract

Charge-stabilized dispersions of inorganic colloids are shown to induce spontaneous emulsification of hydrophobic (TPM) molecules to stable oil-in-water emulsions, with monodisperse, mesoscopic oil droplet diameters in the range of 30-150 nm, irrespective of the polydispersity of the starting dispersions. The results for cobalt ferrite particles and commercial silica sols extend our first study (Sacanna, S.; Kegel, W. K.; Philipse, A. Phys. Rev. Lett. 2007, 98, 158301) on spontaneous emulsification induced by charged magnetite colloids and show that this type of self-assembly is quite generic with respect to the composition of the nanoparticles adsorbing at the oil-water interface. Moreover, we provide additional experimental evidence for the thermodynamic stability of these mesoemulsions, including spontaneous oil dispersal imaged by confocal microscopy and monitored in situ by time-resolved dynamic light scattering. We discuss the possibility that thermodynamic stability of the emulsions is provided by the negative tension of the three-phase line between oil, water, and adsorbed colloids.

Original languageEnglish (US)
Pages (from-to)10486-10492
Number of pages7
JournalLangmuir
Volume23
Issue number21
DOIs
StatePublished - Oct 9 2007

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Emulsification
Colloids
Dispersions
colloids
Oils
oils
Water
water
Emulsions
emulsions
Thermodynamic stability
Ferrosoferric Oxide
thermodynamics
Confocal microscopy
Polydispersity
Magnetite
Polymethyl Methacrylate
Dynamic light scattering
Sols
Silicon Dioxide

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

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Spontaneous oil-in-water emulsification induced by charge-stabilized dispersions of various inorganic colloids. / Sacanna, Stefano; Kegel, W. K.; Philipse, A. P.

In: Langmuir, Vol. 23, No. 21, 09.10.2007, p. 10486-10492.

Research output: Contribution to journalArticle

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