水中的超疏水表面能够吸附气泡并形成气膜，显著地改变界面性质和流体边界条件，因此在海洋工程中水流减阻等方面具有巨大的应用潜力。在气泡吸附和气膜形成的过程中，气泡与超疏水表面之间的相互作用至关重要，决定了气泡的吸附速率和结合强度。本项目通过气泡探针原子力显微镜技术与理论模拟计算相结合的方法，精确量化不同条件下气泡-疏水/超疏水表面相互作用及疏水力等表面力的纳米力学特性，以明确水溶液离子特异性效应和微纳结构表面力几何放大效应的影响机制；通过和频振动光谱技术和分子动力学模拟微观表征气-液和固-液界面水分子的网络结构和水化离子的吸附行为，以揭示支配疏水界面理化性质和组织结构的普适规律；将界面微观表征与纳米力学量化两方面结果对应耦合，建立其映射关系，最终从本质上阐明气泡-超疏水表面相互作用机理。本项目将有助于理解超疏水表面气膜的形成及稳定机制，为实现和优化水下流体减阻等功能提供有力的理论指导。

Superhydrophobic surfaces have exhibited great potential in underwater drag reduction in marine engineering, because they are capable of adsorbing bubbles and forming gas layers in aqueous environment, which can profoundly change the interfacial properties and hydrodynamic boundary conditions. The interactions between bubbles and superhydrophobic surfaces are critical in the bubble adsorption processes. In this project, the nanomechanical characteristics and physical mechanisms of interactions between air bubbles and superhydrophobic surfaces will be intensively studied. Firstly, bubble probe atomic force microscopy (AFM) technique incorporated with Stokes-Reynolds-Young-Laplace (SRYL) theoretical modeling calculation will be applied to precisely quantify the interactions between air bubbles and hydrophobic/superhydrophobic surfaces under different conditions, in order to explicate the effects of ion specificity in aqueous solutions and the geometrical amplification of surface forces mediated by micro/nano structures. Secondly, sum frequency generation vibrational spectroscopy (SFG-VS) and molecular dynamics (MD) simulation will be utilized to microscopically characterize the network of water molecules and the adsorption of hydrated ions at various gas-water and solid-water interfaces, aiming to reveal the universal rules governing the hydrophobic interfaces’ properties and structures. Finally, the results of the interfacial characterization and nanomechanical quantification will be coupled correspondingly with the purpose of elucidating the physical mechanisms of the bubble-superhydrophobic surface interactions. This work will make significant contribution to the basic understanding of the formation and stabilization mechanism of gas layers on submerged superhydrophobic surfaces, and more importantly, to provide powerful theoretical guidance for realizing and optimizing the underwater drag reduction in marine engineering.