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首页> 外文期刊>The European physical journal, E. Soft matter >How a coating is hydrated ahead of the advancing contact line of a volatile solvent droplet
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How a coating is hydrated ahead of the advancing contact line of a volatile solvent droplet

机译：涂层如何在挥发性溶剂滴的前进接触线之前水合

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摘要

The wettability of coatings is very sensitive to the amount of solvent they may contain. When a droplet of volatile solvent, such as water, is deposited on a substrate, its vapor may quickly condensate just ahead of the contact line. We give an estimation of the extent of solvent uptake by a coating of variable thickness e, in front of an advancing contact line of given velocity U . Depending on the values of e and U, we observe three regimes: at low velocity and for a thin coating, the coating adsorbs a fraction of solvent that can quickly equilibrate across its entire thickness, so that it mainly appears solvophilic, while this is not the case for a thick coating. For high velocities, regardless the coating thickness, the coating ahead of the contact line does not have enough time to adsorb a significant amount of solvent, so that it mainly appears solvophobic. All these phenomena appear to be controlled by a molecular cut-off length.
机译：涂料的润湿性对它们可能包含的溶剂量非常敏感。当一滴挥发性溶剂（例如水）沉积在基板上时，其蒸气可能会在接触线之前迅速冷凝。我们给出了在给定速度U的前进接触线之前，厚度可变的e涂层对溶剂吸收程度的估计。根据e和U的值，我们观察到三种情况：低速和薄涂层时，涂层吸收一部分溶剂，该溶剂可以在整个厚度上快速平衡，因此主要表现为亲溶剂性，而这并不是厚涂层的情况。对于高速，无论涂层厚度如何，接触线之前的涂层都没有足够的时间来吸收大量的溶剂，因此主要表现为疏溶剂性。所有这些现象似乎都受分子截止长度的控制。

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