Nanoridge Formation and Dynamics of Stratification in Micellar Freestanding Films.
Nanoridge Formation and Dynamics of Stratification in Micellar Freestanding Films.
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胶束独立式薄膜中纳米脊的形成和分层动力学。
DOI：
10.1021/acs.langmuir.7b01871
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Vivek Sharma
中科院分区：
文献类型：
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作者：
Yiran Zhang;Vivek Sharma
控制和预测自支撑膜（包括泡沫和乳液膜）的稳定性和寿命对于许多工业和生物应用至关重要。独立膜（厚度<100 nm），由表面活性剂稳定的临界胶束浓度以上，表现出分层或逐步变薄。层化通过形成以牺牲周围膜为代价而生长的较薄域来进行。在这篇文章中，我们解决了几个长期存在的挑战有关的实验表征和理论描述的厚度变化，力，通量和流动的分层。我们表明，纳米脊的形成和生长在周围的扩展域的移动前沿，我们可视化他们的形状演变使用干涉数字成像光学显微镜（IDIOM）协议与前所未有的时空分辨率（厚度<10 nm，时间<1 ms）。我们开发了一个理论模型排水通过分层的影响下产生的超分子振荡表面力的限制诱导的胶束分层，我们表明，纳米脊的生长和域扩展动力学可以定量建模。
Controlling and predicting the stability and lifetime of freestanding films, including foam and emulsion films, is crucial for many industrial and biological applications. Freestanding films (thickness <100 nm), stabilized by surfactants above the critical micelle concentration, exhibit stratification or stepwise thinning. Stratification proceeds by formation of thinner domains that grow at the expense of surrounding films. In this Article, we address several longstanding challenges related to the experimental characterization and theoretical description of thickness variations, forces, fluxes and flows underlying stratification. We show that nanoridges form and grow at the moving front around expanding domains, and we visualize their shape evolution using Interferometry Digital Imaging Optical Microscopy (IDIOM) protocols with an unprecedented spatiotemporal resolution (thickness <10 nm, time <1 ms). We develop a theoretical model for drainage via stratification under the influence of supramolecular oscillatory surface forces arising from the confinement-induced layering of micelles, and we show that the nanoridge growth and domain expansion dynamics can be modeled quantitatively.