Oil-in-water emulsification induced by ellipsoidal hematite colloids: Evidence for hydrolysis-mediated self-assembly

Stefano Sacanna, L. Rossi, A. P. Philipse

Research output: Contribution to journalArticle

Abstract

We report on the preparation of a novel type of particle-stabilized oil-in-water emulsions. The emulsification mechanism comprises partial hydrolysis of the oil phase promoted by the alkaline surface of ellipsoidal hematite colloids stabilized by tetramethylammonium hydroxide. This mechanism yields monodisperse oil droplets with embedded single ellipsoidal particles. The emulsions, which are stable for at least several months, can be polymerized by radical initiation, to yield latex-like particles with interesting optical and magnetic properties due to their anisotropic hematite cores. Moreover, we show that complex composite core - shell colloids can be prepared by PMMA growth and silica deposition on polymerized emulsion droplets. Finally, as an example of a possible application for our system, we have measured translational and rotational diffusion coefficients of hematite-stabilized oil droplets by depolarized dynamic light scattering. The latter technique can also be employed to monitor the spontaneous emulsification in time.

Original languageEnglish (US)
Pages (from-to)9974-9982
Number of pages9
JournalLangmuir
Volume23
Issue number20
DOIs
StatePublished - Sep 25 2007

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Emulsification
Hematite
Colloids
hematite
Self assembly
colloids
hydrolysis
self assembly
Hydrolysis
Oils
oils
Emulsions
emulsions
Water
water
Latex
Polymethyl Methacrylate
Dynamic light scattering
latex
Latexes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Oil-in-water emulsification induced by ellipsoidal hematite colloids : Evidence for hydrolysis-mediated self-assembly. / Sacanna, Stefano; Rossi, L.; Philipse, A. P.

In: Langmuir, Vol. 23, No. 20, 25.09.2007, p. 9974-9982.

Research output: Contribution to journalArticle

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