In situ formed Mg(OH)2 nanoparticles as pH-switchable stabilizers for emulsions |
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Authors: | Tan Junjun Wang Jun Wang Liya Xu Jian Sun Dejun |
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Institution: | Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, 250100 Shandong, PR China. |
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Abstract: | Different 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. |
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