Stabilizing and destabilizing films of liquid by design is not a simple challenge to overcome. Megahertz-frequency surface acoustic waves (SAWs), which propagate in a solid substrate, may stabilize liquid films against capillary forces, which otherwise promote the film breakup and the dewetting of the substrate. Here we explore the contribution of SAWs to the dynamics of micron- and submicron-thick films of water, which intervene between a bubble and a solid substrate. The investigation in this paper was inspired by a previous theoretical work on the acoustic Landau-Levich coating problem, which predicts the onset of stable and unstable coating films under the excitation of SAWs. We observe that the parametric regime of the stable Landau-Levich coating film translates to stable water films in our experiments. Moreover, we observe that unlike previous experiments with silicon oil, water films do not collapse under the parametric regime of the unstable Landau-Levich coating film, but appear to remain stable. A key to this controversy appears to be the presence of the stabilizing, long range, electrical double layer force in water, which is anticipated to alter the film response to the SAW.

中文翻译：

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使用表面声波稳定水膜

通过设计使液体膜稳定和不稳定不是要克服的简单挑战。在固体基质中传播的兆赫兹表面声波（SAW）可以使​​液膜免受毛细作用力的影响，否则会促进膜破裂和基质的去湿。在这里，我们探讨了声表面波对水微米级和亚微米级薄膜动态的影响，水薄膜介于气泡和固体基质之间。本文的研究受到以前关于声学Landau-Levich涂层问题的理论研究的启发，该理论工作预测了SAW激发下稳定和不稳定涂层的开始。我们观察到，在我们的实验中，稳定的Landau-Levich涂膜的参数范围转换为稳定的水膜。此外，我们观察到，与先前的硅油实验不同，水膜在不稳定的Landau-Levich涂膜的参数范围内不会塌陷，而是保持稳定。引起争议的关键似乎是在水中存在稳定的长距离双电层力，该力有望改变薄膜对声表面波的响应。