浸润性是固/液界面的核心问题之一，对生产生活有着广泛影响。从分子尺度分析液下固体界面对理解界面分子自组装、单原子催化、细胞膜水分子及水合离子传输，腐蚀等领域十分重要。现阶段，液下固体界面的研究主要还面临分辨率低，信噪比差等问题，因而从分子尺度研究界面浸润性仍旧存在巨大挑战。本项目借助高分辨调频原子力显微镜（FM-AFM），围绕不同浸润性的晶体界面X-Z方向多层水膜结构进行研究。通过调节不同的溶液组分及浓度观察界面水膜的变化，并同时总结微观水膜结构与宏观浸润性的内在联系，将为纳米尺度浸润性的调控以及制备本征浸润性可控的固体界面提供理论支持。此外基于不同环境下的晶面水膜结构的变化，项目将进一步考察功能分子在界面的自组装行为，总结不同结构水膜与自组装功能薄膜的结构及性能之间的内在关联，为制备微观形貌可控的高性能有机无机复合器件提供支持。

Interfacial wettability is one of the most critical questions concerning of solid/liquid surfaces and it has wide influences to our daily life. Detailed analysis of the interfacial wettability under liquid from the perspective of molecular level is significant for understanding the inner mechanism of interfacial self-assembling behaviors, single-atom catalysis, transport of water and hydrated ion through cell membranes, corrosion and so forth. At present, the study of liquid-solid interface under liquid is mainly faced with the problems of low resolution and poor signal-to-noise ratio, so it is still a great challenge to study interface wettability at the molecular scale. Taking advantage of the high-resolution frequency modulated atomic force microscopy (FM-AFM), this project will focus on the structure of molecular water films in X-Z direction of various crystal faces with different wettability. Meanwhile, the detailed water film structures with the variation of different kinds of liquid environments and concentration will be observed. And the relationship between the macroscopic wettability with these different water film structures will be summarized. These findings can offer a support of the wettability control in nano-scale and the fabrication of various atomic flat surfaces with different intrinsic wettability. Besides, based on different water films in various liquid environments, this project will further study the self-assembling behaviors of functional molecules, summarize the inner relationship between the film properties and water film structures, which can further support the controllable fabrication of functional films in organic/inorganic composite devices with high efficiency.