Reversible Liquid Adhesion Switching of Superamphiphobic Pd-Decorated Ag Dendrites via Gas-Induced Structural Changes

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• 作者：Dayeong Kim ; Jungmok Seo ; Sera Shin ; Soonil Lee ; Kilsoo Lee ; Hyeonjin Cho ; Wooyoung Shim ; Han-Bo-Ram Lee ; Taeyoon Lee
• 刊名：Chemistry of Materials
• 出版年：2015
• 出版时间：July 28, 2015
• 年：2015
• 卷：27
• 期：14
• 页码：4964-4971
• 全文大小：556K
• ISSN：1520-5002

文摘

Adhesion control of various liquid droplets on a liquid-repellent surface is a fundamental technique in novel open channel microfluidic systems. Herein, we demonstrate reversible liquid droplet adhesion switching on superamphiphobic Pd-decorated Ag dendrites (Pd/Ag dendrites). Although adhesion between liquids and the superamphiphobic surfaces was extremely low under ambient air, high adhesion was instantly achieved by exposure of the dendrites to 8% hydrogen gas. Transition from low to high adhesion and the reverse case were successfully repeated more than 10 times by switching from atmospheric ambient air to 8% hydrogen gas. This is the first technique that allows real-time reversible adhesion change with various liquid droplets to a surface using gas-induced structural changes and can potentially be used to realize various functions for droplet-based microfluidics.