原子間力顕微鏡による三相界線ナノ構造のダイナミック解析

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Extensive investigations have been carried out on the wetting dynamics of evaporative droplets, as the fact that the spreading and flow transition in volatile droplets remains controversial due to the complexity added by interfacial phase change and non-equilibrium thermal transport. We show, using both mathematical modeling and experiments, that the wetting dynamics of volatile droplets can be scaled by the spatial temporal interplay between capillary, evaporation, and thermal Marangoni effects. We quantify these complex interactions using phase diagrams based on detailed theoretical and experimental analyses. We further illustrate the spreading law of droplets by generalizing Tanner’s law (valid for non-volatile liquids) to a full range of liquids with saturation vapor pressure spanning from 101 to 104 Pa and on substrates with thermal conductivity spanning from 10-1 to 103 W/m/K. Besides its importance in fluid-based industries, the conclusions also enable a unifying explanation to a series of individual works including the criterion of flow reversal and the state of dynamic wetting, making it possible to control liquid transport in diverse application scenarios. The findings to date have been summarized and will be submitted recently.