Ultrafast Impact Superspreading on Superamphiphilic Silicon Surfaces for Effective Thermal Management

作者：Zhu, Zhongpeng; Chen, Yupeng; Luo, Xianfeng; Miao, Weining; Dong, Zhichao; Zhou, Jiajia; Tian, Ye^*; Jiang, Lei

来源：Journal of the American Chemical Society, 2023, 145(28): 15128-15136.

DOI：10.1021/jacs.3c01394

• DROP IMPACT
• TIME

Controllable impact spreading behavioris critical for effectivethermal management of spray cooling. However, splash and retractionare common problems on hydrophobic (HPB) and hydrophilic (HPL) surfaces.Herein, by regulation of surface wettability, we report a controllableultrafast impact superspreading behavior (superspreading time of similar to 3.0ms) without splash and retraction on superamphiphilic (SAPL) siliconsurfaces. Analysis of dynamic wetting processes combined with observationof lateral force microscopy images on SAPL surfaces reveals the existenceof a precursor film at the spreading edge induced by heterogeneoussurface wettability at nanoscale. Further study indicates that theinhibition of splash results from the high liquid flux in precursorfilm, which suppresses the interposition of air at the spreading edge.The reduction of Laplace forces owing to the presence of precursorfilm inhibits retraction at the spreading frontier. Taking advantageof this impact superspreading behavior on SAPL surfaces, effectiveheat dissipation is demonstrated, offering uniform and high heat fluxfor the spray cooling process.

• 单位
  中国科学院; 国家纳米科学中心; 中国科学院研究生院; y