乳液中液滴间相互作用力的测量方法

Measuring Methods of the Interaction Force between Droplets in Emulsions

李宁 方申文 刘帅 段明

LI Ning FANG Shenwen LIU Shuai DUAN Ming

深入研究乳化液液滴之间的相互作用，对食品与制药工业、采油和矿物浮选等有重要的意义。传统研究分 散体系稳定性的方法主要基于大量粒子的宏观性质进行判断，而通过研究单个液滴间的相互作用力来研究乳液 的稳定机制目前还不成熟。测量单分散液滴间的相互作用力可直接揭示乳液稳定性机理。基于经典的DLVO理 论、空间位阻和空位引力模型，借助表面力仪、原子力显微镜，全内反射显微镜和光镊技术可直接定量测定液-液界 面间的不同相互作用力。本文主要综述上述测试技术应用于测量乳液中液滴间相互作用的可行性、原理和特点， 对比了不同测试方法测量液滴间相互作用力的优缺点，为乳液稳定性微观机理的深入研究提供参考。参61

In-depth study of the interactions occurring between emulsion droplets is important to a range of applications from the food and pharmaceutical industries to oil recovery and mineral flotation. The traditional method of studying the stability of dispersion system is mainly based on the judgement of macroscopic properties of large number of particles. However，it is not mature to study the stability mechanism of emulsion by studying the interaction force between single droplets. The stability mechanism of emulsion can be directly elaborate by measuring the interaction force between monodisperse droplets. Based on the classic DLVO theory，the model of steric repulsion and depletion attraction，the surface force apparatus，atomic force microscope， total internal reflection microscope and optical tweezers were used to directly determine the interaction force between liquid and liquid interface. In this paper，the feasibility，principle and characteristic of the above measurement technologies applied to measure the interaction between droplets in emulsion were mainly reviewed，the advantage and disadvantage of different test methods for measuring the interaction force between droplets were compared，which provided reference for further research on the microscopic mechanism of emulsion stability.