Dewetting and deposition of thin films with insoluble surfactants from curved silicone hydrogel substrates.
Dewetting and deposition of thin films with insoluble surfactants from curved silicone hydrogel substrates.
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用不溶性表面活性剂从弯曲的硅水凝胶基底上去除和沉积薄膜。
DOI：
10.1016/j.jcis.2015.01.002
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发表时间：
2015
影响因子：
9.9
通讯作者：
Fuller,GeraldG
中科院分区：
文献类型：
--
作者：
Bhamla,MSaad;Balemans,Caroline;Fuller,GeraldG
我们研究了不溶性表面活性剂单分子膜对薄水膜的稳定作用。我们首先描述了一个实验平台，该平台能够在弯曲的硅水凝胶（SiHy）基底上形成充满二棕榈酰磷脂酰胆碱（DPPC）单层的水性膜。我们发现，这些表面活性剂层延长了水膜的寿命。膜最终通过干燥区域的成核和生长而“去湿”，并且该去湿的开始可以通过DPPC层的表面流变学来控制。因此，我们表明，增加DPPC层的界面流变性导致稳定的膜，延迟去湿。我们还表明，可以利用去湿可控图案的底层弯曲的SiHy基板与DPPC层。
We investigate the stabilizing effect of insoluble surfactant monolayers on thin aqueous films. We first describe an experimental platform that enables the formation of aqueous films laden with dipalmitoylphosphatidylcholine (DPPC) monolayers on curved silicone hydrogel (SiHy) substrates. We show that these surfactant layers extend the lifetime of the aqueous films. The films eventually “dewet” by the nucleation and growth of dry areas and the onset of this dewetting can be controlled by the surface rheology of the DPPC layer. We thus demonstrate that increasing the interfacial rheology of the DPPC layer leads to stable films that delay dewetting. We also show that dewetting can be exploited to controllably pattern the underlying curved SiHy substrates with DPPC layers.