Astafyeva Ksenia, Urbach Wladimir, Garroum Nabil, Taulier Nicolas, Thiam Abdou R
†Laboratoire de Physique Statistique, Ecole Normale Supérieure, Sorbonne Universités, UPMC Université, and Université Paris Diderot, CNRS, 24 rue Lhomond, F-75005 Paris, France.
‡Université René Descartes, Paris, France.
Langmuir. 2015 Jun 23;31(24):6791-6. doi: 10.1021/acs.langmuir.5b00749. Epub 2015 Jun 10.
The stability of model surfactant bilayers from the poly(ethylene glycol) mono-n-dodecyl ether (C12Ej) family was probed. The surfactant bilayers were formed by the adhesion of emulsion droplets. We generated C12Ej bilayers by forming water-in-oil (w/o) emulsions with saline water droplets, covered by the surfactant, in a silicone and octane oil mixture. Using microfluidics, we studied the stability of those bilayers. C12E1 allowed only short-lived bilayers whereas C12E2 bilayers were stable over a wide range of oil mixtures. At high C12E2 concentration, a two-phase region was displayed in the phase diagram: bilayers formed by the adhesion of two water droplets and Janus-like particles consisting of adhering aqueous and amphiphilic droplets. C12E8 and C12E25 did not mediate bilayer formation and caused phase inversion leading to o/w emulsion. With intermediate C12E4 and C12E5 surfactants, both w/o and o/w emulsions were unstable. We provided the titration of the C12E2 bilayer with C12E4 and C12E5 to study and predict their stability behavior.
对聚乙二醇单正十二烷基醚（C12Ej）家族的模型表面活性剂双层的稳定性进行了探究。表面活性剂双层是通过乳液滴的粘附形成的。我们通过在硅氧烷和辛烷油混合物中形成覆盖有表面活性剂的盐水滴的油包水（w/o）乳液来生成C12Ej双层。利用微流控技术，我们研究了这些双层的稳定性。C12E1仅能形成寿命短暂的双层，而C12E2双层在广泛的油混合物范围内都很稳定。在高C12E2浓度下，相图中显示出一个两相区域：由两个水滴粘附形成的双层以及由粘附的水性和两亲性液滴组成的类Janus颗粒。C12E8和C12E25不会介导双层形成，并导致相转变形成水包油（o/w）乳液。对于中间的C12E4和C12E5表面活性剂，w/o和o/w乳液都不稳定。我们用C12E4和C12E5对C12E2双层进行了滴定，以研究和预测它们的稳定性行为。
