发表机构
University of Chinese Academy of Sciences; The Hong Kong Polytechnic University; Chinese Academy of Sciences（中国科学院大学; 香港理工大学; 中国科学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究通过调整微柱形状与排列规避能垒，实现了结构化表面上弱亲水性液体的毛细上升，达到热力学极限，获82度接触角，其毛细上升系数优于同孔隙率矩形沟槽，可推进生物医学与热管理技术。
AI 中文摘要
毛细管中的毛细上升只要液体接触角小于90度就会发生，这使得弱亲水性液体能够自发侵入管内。对于结构化表面，能量最小化论证预测同样成立。但由于结构化表面诱导的能垒，弱亲水性液体在结构化表面上的毛细上升此前无法实现。我们展示了如何通过调整微柱的形状和排列来规避这些能垒，从而使毛细上升所需的润湿性达到理论极限。实验报告了前所未有的82度毛细上升接触角。更令人惊讶的是，在相同孔隙率下，此类表面的毛细上升系数可大于矩形沟槽表面的对应值。这些发现可能显著推进生物医学和热管理技术的发展。
英文摘要
Wicking in a capillary tube could happen as long as the liquid contact angle is smaller than 90 degrees, making it possible for weak hydrophilic liquids to spontaneously invade the tube. For textured surfaces, energy minimization argument predicts the same. However, wicking of weak hydrophilic liquids on textured surfaces has not been possible due to energy barriers induced by the textures. We demonstrate how these barriers could be avoided by adjusting the shape and arrangement of the pillars, thus the wettability required for wicking reaches the theoretical limit. An unprecedented wicking contact angle of 82 degrees is reported. More surprisingly, wicking coefficients of such surfaces can be larger than that of rectangular grooves at the same porosity. These findings may significantly advance biomedical and thermal management technologies.
CommentsThis work is under review at a peer-reviewed journal. Correspondence should be addressed to liyanshen@ucas.ac.cn
