溶质诱导的分子尺度亲水性：疏水碳基表面盐溶液的分子厚荷电饼
Molecular-Scale Hydrophilicity Induced by Solute: Molecular-thick Charged Pancakes of Aqueous Salt Solution on Hydrophobic Carbon-based Surfaces
摘要：
我们直接观察到分子厚的盐水溶液煎饼在疏水石墨表面的环境条件下，采用原子力显微镜。该观察结果表明盐溶液在石墨表面上具有意想不到的分子级亲水性，这不同于液滴在石墨表面上的宏观润湿性质。有趣的是，煎饼自发地表现出强烈的正电荷行为。理论研究表明，这种带正电荷的煎饼的形成归因于水溶液中的Na+离子与石墨表面上的芳环之间的阳离子-π相互作用，促进了水分子与阳离子一起吸附到石墨表面上;即，Na+离子作为介质，在一侧通过阳离子-π相互作用吸附到石墨表面，同时在另一侧通过水合相互作用在分子尺度上与水分子键合。这些发现表明，关于碳基石墨表面的实际相互作用，包括石墨烯、碳纳米管和生物炭的相互作用，可能与现有理论有显著不同，它们为控制表面润湿性、相互作用和相关的物理、化学和生物过程提供了新的见解。
英文摘要：
We directly observed molecular-thick aqueous salt-solution pancakes on a hydrophobic graphite surface under ambient conditions employing atomic force microscopy. This observation indicates the unexpected molecular-scale hydrophilicity of the salt solution on graphite surfaces, which is different from the macroscopic wetting property of a droplet standing on the graphite surface. Interestingly, the pancakes spontaneously displayed strong positively charged behavior. Theoretical studies showed that the formation of such positively charged pancakes is attributed to cation-π interactions between Na+ ions in the aqueous solution and aromatic rings on the graphite surface, promoting the adsorption of water molecules together with cations onto the graphite surface; i.e., Na+ ions as a medium adsorbed to the graphite surface through cation-π interactions on one side while at the same time bonding to water molecules through hydration interaction on the other side at a molecular scale. These findings suggest that actual interactions regarding carbon-based graphitic surfaces including those of graphene, carbon nanotubes, and biochar may be significantly different from existing theory and they provide new insight into the control of surface wettability, interactions and related physical, chemical and biological processes.
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