Direct observation of spreading precursor liquids in a corner
作者机构：Key Laboratory of Bioinspired Smart Interfacial Science Technical Institute of Physics and Chemistry Chinese Academy of Sciences School of Future Technology University of Chinese Academy of Sciences State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences School of Engineering Science University of Chinese Academy of Sciences
出 版 物：《National Science Review》 (国家科学评论(英文版))
年 卷 期：2023年第10卷第7期
页 面：196-202页
核心收录：
学科分类：08[工学] 080103[工学-流体力学] 0801[工学-力学（可授工学、理学学位）]
基 金：supported by the National Natural Science Foundation of China (21988102 (L.J.), 21972154 and 22090052(Y.T.),and 12072346 (Q.Y.)) the Frontier Science Key Projects of Chinese Academy of Sciences (ZDBS-LY-SLH022 (Y.T.)) the China National Postdoctoral Program for Innovative Talents(BX20220312 (W.M.))
主 题：precursor liquid spreading spatial–temporal characteristic direct observation corner ionic liquids
摘 要：Precursor liquid is a nanoscale liquid creeping ahead of the macroscopic edge of spreading liquids,whose behaviors tightly correlate with the three-phase reaction efficiency and patterning accuracy.However,the important spatial-temporal characteristic of the precursor liquid still remains obscure because its real-time spreading process has not been directly observed.Here,we report that the spreading ionic liquid precursors in a silicon corner can be directly captured on video using in situ scanning electron microscopy.In situ spreading videos show that the precursor liquid spreads linearly over time(ΔL～ΔT) rather than obeying the classic Lucas-Washburn law(l～t1/2) and possesses a characteristic width of ～250-310 nm.Theoretical analyses and molecular dynamics simulations demonstrate that the unique behaviors of precursor liquids originate from the competing effect of van der Waals force and surface energy.These findings provide avenues for directly observing liquid/solid interfacial phenomena on a microscopic level.
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