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Issue 32, 2016
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Pickering emulsions stabilized by hydrophilic nanoparticles: in situ surface modification by oil

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Abstract

We propose a novel route for the stabilization of oil-in-water Pickering emulsions using inherently hydrophilic nanoparticles. In the case of dialkyl adipate oils, in situ hydrophobisation of the particles by dissolved oil molecules in the aqueous phase enables stable emulsions to be formed. Emulsion stability is enhanced upon decreasing the chain length of the oil due to its increased solubility in the precursor aqueous phase. The oil thus acts like a surfactant in this respect in which hydrogen bonds form between the carbonyl group of the ester oil and the hydroxyl group on particle surfaces. The particles chosen include both fumed and precipitated anionic silica and cationic zirconia. Complementary experiments including relevant oil–water–solid contact angles and infra-red analysis of dried particles after contact with oil support the proposed mechanism.

Graphical abstract: Pickering emulsions stabilized by hydrophilic nanoparticles: in situ surface modification by oil

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Article information


Submitted
26 May 2016
Accepted
20 Jul 2016
First published
25 Jul 2016

Soft Matter, 2016,12, 6858-6867
Article type
Paper
Author version available

Pickering emulsions stabilized by hydrophilic nanoparticles: in situ surface modification by oil

B. P. Binks and D. Yin, Soft Matter, 2016, 12, 6858
DOI: 10.1039/C6SM01214K

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