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Humidity-accelerated spreading of ionic liquids on a mica surface

机译：离子液体在云母表面上的湿度加速扩散

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The role of relative humidity (RH) on the kinetic spreading and equilibrium contact angles of droplets of two [Rmim][NTf2] ionic liquids (ILs) on a mica surface was investigated using contact angle measurement and atomic force microscopy (AFM) imaging. Firstly, with contact angle measurement, we found that increasing RH accelerates the kinetic spreading and reduces the equilibrium contact angles of the droplets of two studied ILs on mica. Then by analyzing the mica surface with AFM imaging, we observed that the increasing RH leads to enhanced water vapor adsorption on mica and accordingly enhanced coverage of the IL precursor film on mica. It is essentially the enhanced coverage of the IL precursor film that induces the acceleration of IL droplet spreading and the reduction of their equilibrium contact angles. The analysis of experimental results also suggests that the surface diffusion coefficients of IL precursor films as well as the equilibrium contact angles of IL droplets have a threshold at a RH of ～70%, which indicates the formation of a complete water monolayer on mica. Such a water layer facilitates the formation of a uniform IL precursor film on the mica surface, which would modify the surface energy of mica and thus the contact angle of IL droplets on mica. The findings from the present investigation are instrumental in the fundamental understanding of the wetting behavior of ionic liquids in humid environments and also offer practical insights into applications of ionic liquids in lubrication and electrochemical energy systems.
机译：相对湿度（RH）对云母表面两种[Rmim] [NTf 2 ]离子液体（ILs）的液滴动力学扩散和平衡接触角的作用使用接触角测量和原子力显微镜（AFM）成像进行了研究。首先，通过接触角测量，我们发现增加RH可以加速动力学扩散，并降低两个研究的ILs在云母上的液滴的平衡接触角。然后，通过使用AFM成像分析云母表面，我们观察到RH的增加导致云母上水蒸气的吸附增强，从而导致IL前体膜在云母上的覆盖率提高。从本质上讲，IL前驱膜的覆盖率提高导致IL液滴扩散加速并降低了其平衡接触角。实验结果分析还表明，IL前体膜的表面扩散系数以及IL液滴的平衡接触角在RH〜70％处具有阈值，这表明在云母上形成了完整的水单层。这样的水层有助于在云母表面上形成均匀的IL前体膜，这将改变云母的表面能，从而改变IL液滴在云母上的接触角。本研究的发现有助于对离子液体在潮湿环境中的润湿行为有基本的了解，也为离子液体在润滑和电化学能源系统中的应用提供了实用的见识。

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