基于平行板流动小室的微胶囊颗粒细观力学特征研究

平行板流动小室装置被长期运用于统计颗粒吸附性能的研究领域，但目前还没有运用该装置直接测量并计算颗粒在特定表面的吸附力和运用此装置研究颗粒在特定表面上摩擦性能的研究，因此本项目旨在创新采用平行板流动小室装置研究单个微胶囊在特定表面的吸附力和摩擦力。具体包括：（1）研究不同环境下微胶囊在特定表面的接触理论；（2）研究附着在特定表面的微胶囊颗粒在平行板流动小室中的受力情况以及这些胶囊从表面被流体带走的移动机理；（3）根据微胶囊颗粒的接触力学，受力分析，以及它们被流体带走的作用机理建立数学模型并设计实验，运用该装置测量并计算单个微胶囊与特定表面的吸附力和摩擦力。本项目提出的方法论可将平行板流动小室装置的运用扩展到直接测量微观颗粒在特定表面上的吸附力和摩擦力，为微观世界的表征开辟一种更为廉价、可靠、简便易行的研究方法。

The parallel-plate flow chamber technique has been used to characterize the adhesion between microparticles and a surface by employing a large sample population, and it therefore based on statistical analysis by counting the number of particles remaining on a substrate, or calculating the surface area coverage after applying an air or a fluid flow. Until now, there was no publication to report using the flow chamber technique to investigate the adhesive force between microparticles and a substrate directly; moreover, no work was described to use this technique to characterize the friction when a microparticle is displaced from a substrate. Therefore, the main objective of this project is to apply the parallel-plate flow chamber technique to investigate the adhesive force between a microcapsule and a substrate and the friction between them when the microcapsule is displaced from the substrate. The main contents are as follows: (1) Investigate the contact mechanics between a microcapsule and a substrate, especially in liquid environments which hasn't been fully understood; (2) Analysis the forces acting on the microcapsule and try to understand the mechanism of removal when the particle is displaced from the surface; (3) According to the contact mechanics and the removal mechanism between the particle and the substrate, a mathematical model is built and experiments are designed to collect data to calculate the adhesion force and the static friction coefficient between the microcapsule and the substrate.