纳米颗粒调控动态润湿行为的力学机制研究

Uniform and stable suspensions containing nanoparticles is termed as nanofluid. By changing geometric parameters and surface properties of nanoparticles, the dynamic wetting behaviors of nanofluids can be tuned effectively. This feature facilitates the nanofluid to show significant application prospects in various areas such as energy & environment, tribology & lubrication, biological medicine, etc.However, there is still no consensus on the mechanical mechanism of dynamic wetting behavior of nanofluids, which is the bottleneck for the further application of the tuned dynamic wetting behavior. Combining the methods of molecular dynamics simulation, experimental observation and theoretical analysis, this project investigates three core problems: (1) Mechanical mechanism of contact line movement under the action of nanoparticles. (2) Control and characterization of surface forces and intermolecular forces in nanofuilds. (3) Optimal design of geometric parameters and surface properties of nanoparticles. Moreover, we intend to propose the micromechanical mechanism of nanoparticle-tuned dynamic wetting behavior. This project is supposed to achieve several significant breakthroughs and make our original contribution to the application of the active controlled dynamic behavior of nanofluids.

含有纳米颗粒的均匀稳定溶液被称为是纳米流体。通过改变纳米颗粒的几何参数和表面性质可以有效地调控纳米流体的动态润湿行为。纳米流体的该特性使其在能源环境、摩擦润滑、生物医药等领域表现出重要的应用前景。在纳米颗粒调控动态润湿行为的研究中，纳米颗粒之间以及纳米颗粒与周围基液之间相互作用的表面力和分子间力是重要的决定因素。然而，纳米流体动态润湿行为的力学机制目前仍没有形成统一的认识，这极大限制了该可调控润湿行为的进一步应用。本申请项目拟采用分子动力学模拟、实验观测、理论建模相结合的方式，研究纳米颗粒影响接触线移动的力学机制、纳米流体中表面力和分子间力的调控与表征、纳米颗粒的几何参数和表面性质的优化设计这三个关键科学问题，提出纳米颗粒调控动态润湿的微观力学机制。本项目将力争取得一些突破性的研究成果，从而为纳米流体动态润湿行为主动调控的推广应用做出原创性的贡献。