Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 359, Issue 1, Pages 155-162Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2010.10.038
Keywords
Pickering emulsion; pH-switchability; In situ formed nanoparticles; Magnesium hydroxide
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Funding
- Chinese National Programs for Fundamental Research and Development (973 Program) [2009CB930100]
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Different from from traditional methods for preparing pH-switchable Pickering emulsifiers, a simple and straightforward approach is established on the basis of a reversible process between in situ formation and dissolution of Mg(OH)(2) nanoparticles (MHp). It was found that when pH value was above 9.5, emulsions of liquid paraffin-in-water can be stabilized by the resulting surface-active particles. Below this pH, emulsions demulsify, resulting in a reversible Pickering emulsifier. Based on the strongly pH-dependent precipitation of metal hydroxide nanoparticles, this procedure offers a new way to design pH-switchable emulsifiers without aid of any other organic matters. (C) 2010 Published by Elsevier Inc.
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