We report a method to dynamically control the surface of gallium-based liquid metal to switch between reflective/diffusive states by removing/depositing oxide films via electrochemical redox reactions. Electrochemical oxidation deposits rough surface oxides that are optically diffusive. Electrochemical reduction returns the metal to a pristine, smooth, and reflective state. This switching is achieved using only ±1.4V. In addition, a meniscus of liquid metal can be pumped to switch between concave/convex shapes. This work expands the range of optical applications of dynamic liquid metal surfaces.

中文翻译：

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EGaIn液态金属上反射/漫射光学表面的动态控制

我们报告了一种通过电化学氧化还原反应去除/沉积氧化膜来动态控制镓基液态金属表面以在反射/扩散状态之间切换的方法。电化学氧化沉积具有光学漫射性的粗糙表面氧化物。电化学还原使金属恢复到原始、光滑和反射状态。仅使用 ±1.4V 即可实现此切换。此外，可以泵送液态金属的弯液面以在凹/凸形状之间切换。这项工作扩展了动态液态金属表面的光学应用范围。