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设计出以可编程控制器、伺服电机放大器、伺服电机和编码器为主要部件的可编程机械斩光器,并将其与多光镊系统相耦合,构建了胶体微粒间相互作用势测量系统。利用该系统测量聚苯乙烯球悬浮液中两个小球之间的静电相互作用势,其结果与胶体稳定理论符合,验证了系统的可靠性。该斩光器具有良好的易用性、兼容性和可移植性。并且该系统能在可控的物理化学条件下从粒子层次直接测量胶体粒子间不同类型的相互作用势,为深入研究胶体的微观机制提供了一种有效的测量手段和技术平台。
A programmable mechanical chopper with programmable controller, servo motor amplifier, servo motor and encoder as its main components was designed and coupled with multi-optical tweezers system to build the system of interaction potential between colloidal particles. The system was used to measure the electrostatic interaction potential between two balls in the suspension of polystyrene. The result is consistent with the theory of colloidal stability, which verifies the reliability of the system. The chopper has good ease of use, compatibility and portability. And the system can directly measure different types of interaction potentials of colloidal particles from the particle level under controllable physico-chemical conditions, and provides an effective measurement means and technology platform for further study of the colloidal micro-mechanism.