基于原子力显微镜的胶体颗粒相互作用力测量研究

Research on the measurement of the interaction forces between colloidal particles based on atomic force microscopy

胶体颗粒絮凝是环境科学领域的研究热点之一,不同环境条件下颗粒间的相互作用力对絮凝起着重要作用。采用聚苯乙烯胶体颗粒作为研究对象,设计实验方案,用原子力显微镜(atomic force microscope,AFM)测量不同电解质溶液中颗粒间相互作用力。在一定范围内,实验值和扩展的胶体稳定性(XDLVO)理论值吻合。液相环境中测量聚苯乙烯胶体颗粒间相互作用力的技术为测量具有复杂形状的胶体颗粒间相互作用力提供了依据。

The study on flocculation processes of colloidal particles is one of the research highlights in the field of environmental science. The interaction forces between particles in different environmental conditions play an important role in the flocculation processes of particles. Atomic Force Microscope（ AFM） was used to measure the interaction forces between polystyrene colloidal particles in different electrolyte solutions. The observed forces show a good agreement with the analytical results obtained by the XDLVO theory in a certain range. The technique of measuring the interaction between polystyrene particles in liquid phase is the basis for measuring the interaction forces between colloidal particles with complex shapes.