Droplets on Soft Surfaces Exhibit a Reluctance to Coalesce due to an Intervening Wetting Ridge,Advanced Materials Interfaces

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Droplets on Soft Surfaces Exhibit a Reluctance to Coalesce due to an Intervening Wetting Ridge
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2020-07-12 , DOI: 10.1002/admi.202000731
Rishav Roy ₁ , Robert L. Seiler ₂ , Justin A. Weibel ₁ , Suresh V. Garimella ₁

Affiliation

Microscale interactions with deformable substrates are of fundamental interest for studying self‐assembly processes and the mobility of cells on soft surfaces, with applications in traction force microscopy. The behavior of microscale water droplets on a soft polymer substrate is investigated. Droplets formed by condensation on the soft substrate are reluctant to coalesce, which leads to coverage of the surface with clusters of droplets assembled in a honeycomb‐like pattern. Cryogenically fixed in this state, scanning electron microscopy of these droplets reveals the presence of an intervening wetting ridge of the polymer that acts as a barrier between neighboring droplets and prevents coalescence. A linear elastic deformation model is developed to predict this surface profile and corroborate the observed behavior.

中文翻译：

由于中间的润湿脊，软表面上的液滴表现出不易聚结的特性

与可变形基质的微观相互作用是研究自组装过程和细胞在柔软表面上的迁移性的基本兴趣，并在牵引力显微镜中得到了应用。研究了微细水滴在软质聚合物基材上的行为。由于在软质基材上凝结而形成的液滴不愿聚结，这导致表面上聚集了呈蜂窝状组装的液滴簇。在这种状态下以低温方式固定后，这些液滴的扫描电子显微镜显示出存在中间的聚合物润湿脊，该润湿脊充当相邻液滴之间的屏障并防止聚结。开发了线性弹性变形模型来预测此表面轮廓并证实观察到的行为。

更新日期：2020-09-11

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