Pinning Control of Droplet Contact Line on Phase-Change Lubricant-Impregnated Surface
발표자
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초록
내용
Understanding evaporation of sessile drops is essential for various research fields, including inkjet printing, colloidal assembly, and DNA mapping. Contact line of a droplet is pinned or recedes during evaporation, and evaporation dynamics can be controlled by surface modification. For example, on a lubricant-impregnated surface (LIS), the droplet contact line reduces easily due to low friction induced by lubricant. However, once a droplet deposits, contact radius of droplet on LIS decreases linearly in time and can become uncontrolled. Herein, we present contact line pinning control method by adopting phase-change material on LIS. Depending on the temperature of lubricant, a phase of lubricant changes, and a solidified meniscus induces strong pinning at contact line of droplet. Different sizes of colloidal assemblies can be fabricated by adjusting contact area of aqueous colloidal dispersion. In conclusion, this strategy will bring potential for shape control of water-based droplets.