CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Small. 2023 May;19(21):e2207327. doi: 10.1002/smll.202207327. Epub 2023 Mar 3.
Constructing wrinkled structures on the surface of materials to obtain new functions has broad application prospects. Here a generalized method is reported to fabricate multi-scale and diverse-dimensional oxide wrinkles on liquid metal surfaces by an electrochemical anodization method. The oxide film on the surface of the liquid metal is successfully thickened to hundreds of nanometers by electrochemical anodization, and then the micro-wrinkles with height differences of several hundred nanometers are obtained by the growth stress. It is succeeded in altering the distribution of growth stress by changing the substrate geometry to induce different wrinkle morphologies, such as one-dimensional striped wrinkles and two-dimensional labyrinth wrinkles. Further, radial wrinkles are obtained under the hoop stress induced by the difference in surface tensions. These hierarchical wrinkles of different scales can exist on the liquid metal surface simultaneously. Surface wrinkles of liquid metal may have potential applications in the future for flexible electronics, sensors, displays, and so on.
在材料表面构建褶皱结构以获得新功能具有广阔的应用前景。在这里，报道了一种通过电化学阳极氧化法在液态金属表面制备多尺度、多维氧化物褶皱的通用方法。通过电化学阳极氧化，成功地将液态金属表面的氧化物薄膜增厚到数百纳米，然后通过生长应力获得具有数百纳米高度差的微皱纹。通过改变基底几何形状来改变生长应力的分布，成功地诱导出不同的褶皱形态，如一维条纹褶皱和二维迷宫褶皱。进一步，在由表面张力差引起的环向应力下获得了径向褶皱。这些不同尺度的分层褶皱可以同时存在于液态金属表面。液态金属的表面褶皱在未来可能在柔性电子、传感器、显示器等方面具有潜在的应用。
