Compositional ripening of particle- and surfactant-stabilised emulsions: a comparison
Compositional ripening of particle- and surfactant-stabilised emulsions: a comparison
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DOI：
10.1039/b918812f
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发表时间：
2010-01-01
影响因子：
3.3
通讯作者：
Wong, Kenneth
中科院分区：
文献类型：
--
作者：
Binks, Bernard P.;Fletcher, Paul D. I.;Wong, Kenneth
当水-离子乳状液与水角鲨烷乳状液混合时，微水溶性、可移动的-离子酮将质量传递给高度不溶于水、不移动的油角鲨烷滴。我们研究了这种由颗粒或表面活性剂分子稳定的乳液的组成成熟过程。对于颗粒稳定的乳剂，含有角鲨烷的液滴的膨胀触发液滴聚并，导致最终膨胀的液滴半径与膨胀比的1次方成正比。表面活性剂稳定的乳剂膨胀时没有聚并，这使得最终的液滴半径与膨胀比的1/3次方成正比。在颗粒稳定的乳液中加入过量的、未吸附的颗粒，抑制了由膨胀引发的聚结，并导致颗粒行为向表面活性剂行为的转变。
When beta-ionone-in-water emulsions are mixed with squalane-in-water emulsions, the slightly water-soluble, mobile beta-ionone undergoes mass transfer to the drops of highly water-insoluble, immobile oil squalane. We have investigated this compositional ripening process for emulsions stabilised either by particles or by surfactant molecules. For particle-stabilised emulsions, the swelling of the squalane-containing drops triggers droplet coalescence which causes the final swollen droplet radius to be proportional to the swelling ratio to the power of 1.Surfactant-stabilised emulsions swell without coalescence which causes the final droplet radius to be proportional to the swelling ratio to the power 1/3. Addition of excess, non-adsorbed particles to the particle-stabilised emulsions suppresses the swelling-triggered coalescence and causes a switchover from particle to surfactant behaviour.