Raw data (Wetting angles) from Characterization of interface properties of fluids by evaporation of a capillary bridge

The surface properties between two non-miscible fluids are key elements to understand mass transfer, chemistry and bio-chemistry at interfaces. In this paper, surface properties are investigated in evaporating and non-evaporating conditions. A capillary bridge between two large plates (similarly as a Hele-Shaw cell) is considered. The temporal evolution of surface forces and mass transfers due to evaporation of the liquid are measured. The force depends on surface properties of the substrate. It is adhesive in the wetting case and repulsive in the non-wetting case. The force is also shown to depend linearly on the volume of the capillary bridge F ∝ V0 and inversely to the height of the bridge. Modelling is performed to characterize both surface force and evaporation properties of the capillary bridge. The evaporation is shown to be diffusion driven and is decoupled from the bridge mechanics.两种互不相溶流体间的界面性质，是理解界面处传质过程、化学及生物化学行为的核心要素。本研究针对蒸发与非蒸发两种工况下的界面性质展开探究，考虑两块大平板间形成的毛细管桥结构，其原理与赫勒-肖单元（Hele-Shaw cell）类似。本研究测量了液体蒸发引发的界面力随时间的演化过程与传质行为。该界面力的大小取决于基底的界面性质：在润湿工况下表现为粘附力，在非润湿工况下则表现为排斥力。研究还发现，界面力与毛细管桥的体积呈线性正相关（F ∝ V₀），且与桥体高度成反比。本研究通过建模手段，对毛细管桥的界面力与蒸发特性进行了表征。实验结果表明，蒸发过程由扩散效应主导，且与桥体的力学行为相互解耦。