Multiscale Textured Mesh Substrates that Glide Alcohol Droplets and Impede Ice Nucleation
Multiscale Textured Mesh Substrates that Glide Alcohol Droplets and Impede Ice Nucleation
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DOI：
10.1002/adem.202101524
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发表时间：
2022-03-28
影响因子：
3.6
通讯作者：
Banerjee, Sarbajit
中科院分区：
文献类型：
--
作者：
Bajpayee, Aayushi;Rivera-Gonzalez, Natalia;Banerjee, Sarbajit
纹理表面通常设计用于防止水润湿。鉴于这些液体的低表面张力、粘度和密度，不被醇润湿的表面的设计是一个相当大的挑战。在此，提出了一种分层纹理的质子结构，可以将酒精滴悬浮在亚稳态的 Cassie-Baxter 状态中。由于底层不锈钢网的微观纹理、源自 ZnO 四足体的多尺度纹理以及全氟化多面体低聚倍半硅氧烷的表面功能化，表面可滑动脂肪醇、水和正十六烷。不被酒精润湿的表面的设计与“护理点”环境特别相关。由于界面接触面积最小化，纹理表面进一步极大地抑制了固/液界面处的冰成核。冻结和液滴撞击的高速视频成像表明，纹理表面通过抑制异质成核来延迟冰成核，更有效地在液滴撞击时引导动能以破碎撞击的液滴，并极大地限制霜的形成。一旦冰形成，与平面基材相比，其粘附力就会显着降低约三个数量级。结果证明了一种可扩展的喷雾沉积方法来生成表面，从而实现液体的确定性流动并抑制冰的形成。
Textured surfaces are commonly designed to preclude wetting by water. The design of surfaces that are not wetted by alcohols represents a considerable challenge given the low surface tension, viscosity, and density of these liquids. Herein, a hierarchically textured plastronic architecture that can suspend alcohol droplets in a metastable Cassie-Baxter regime is presented. As a result of microtexturation of the underlying stainless steel mesh, multiscale texturation derived from ZnO tetrapods, and surface functionalization with perfluorinated-polyhedral oligomeric silsesquioxanes, the surfaces glide aliphatic alcohols, water, and n-hexadecane. The design of surfaces not wetted by alcohols is particularly relevant to "point-of-care" environments. Because of the minimized interfacial contact areas, the textured surfaces further greatly inhibit ice nucleation at solid/liquid interfaces. High-speed video imaging of the freezing and droplet impact shows that the textured surfaces delay ice nucleation by inhibiting heterogeneous nucleation, more effectively channel kinetic energy upon droplet impact to break up impinging droplets, and greatly limit frost formation. Once ice forms, its adhesion is substantially diminished by about three orders of magnitude as compared with planar substrates. The results demonstrate a scalable spray deposition method to generate surfaces for enabling the deterministic flow of liquids as well as inhibit ice formation.