Pickering emulsions stabilized by surface-modified Fe₃O₄ nanoparticles

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• 作者：Jun Zhoup>ap> ; Lijun Wangp>ap> ; Xiuying Qiaop>ap>p> ;   ; p>p>xyqiao@sjtu.edu.cnp> ; Bernard P. Binksp>bp>p> ;   ; p>p>b.p.binks@hull.ac.ukp> ; Kang Sunp>ap>
• 关键词：Pickering emulsion ; Fe₃O₄ ; Nanoparticles
• 刊名：Journal of Colloid and Interface Science
• 出版年：2012
• 出版时间：1 February 2012
• 年：2012
• 卷：367
• 期：1
• 页码：213-224
• 全文大小：2340 K

文摘

Unmodified Fe₃O₄ nanoparticles do not stabilize Pickering emulsions of a polar oil like butyl butyrate. In order to obtain stable emulsions, the Fe₃O₄ nanoparticles were modified by either carboxylic acid (RCOOH) or silane coupling agents (RSi(OC₂H₅)₃) to increase their hydrophobicity. The influence of such surface modification on the stability of the resultant Pickering emulsions was investigated in detail for both a non-polar oil (dodecane) and butyl butyrate in mixtures with water. The stability of dodecane-in-water emulsions in the presence of carboxylic acid-coated particles decreases as the length of the alkyl group (R) and the coating extent increase. However, such particles are incapable of stabilizing butyl butyrate-water emulsions even when the carboxylic acid length is decreased to two. However, the silane-coated Fe₃O₄ nanoparticles can stabilize butyl butyrate-in-water emulsions, and they also increase the stability of dodecane-in-water emulsions. Thermal gravimetric analysis indicates that the molar quantity of silane reagent is much higher than that of carboxylic acid on nanoparticle surfaces after modification, raising their hydrophobicity and enabling enhanced stability of the resultant polar oil¨Cwater emulsions.