Probing interactions between colloidal particles with oscillating optical tweezers
Probing interactions between colloidal particles with oscillating optical tweezers
复制标题
用振荡光镊探测胶体颗粒之间的相互作用
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
A. Ward
中科院分区：
文献类型：
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作者：
Christopher D. Mellor;M. Sharp;C. Bain;A. Ward
光阱在研究胶体体系中的弱相互作用方面的潜力是公认的。本文建立了低雷诺数极限下流体中两个相互作用的硬球振荡的理论模型。粒子的振荡幅度和粒子运动与光阱之间的相位滞后是粒子之间的流体动力学耦合和相互作用势的函数。粒子-粒子相互作用的影响对于沿它们的中心线沿着异步振荡的粒子是最显著的。该方案的实验实现证明了在水中的聚苯乙烯胶乳的模型系统和理论预测与实验结果进行了比较。这一想法的扩展到水包油乳液进行了讨论。
The potential of optical traps for the study of weak interactions in colloidal systems is well recognized. In this paper, a theoretical model is developed for two oscillating interacting hard spheres in a fluid in the low Reynolds number limit. The amplitude of oscillation of the particle and the phase lag between the motion of the particles and the optical traps are a function of both the hydrodynamic coupling between the particles and the interaction potential. The effect of the particle-particle interaction is most pronounced for particles oscillated asynchronously along their line of centers. The experimental realization of this scheme is demonstrated for the model system of polystyrene latices in water and the theoretical predictions are compared with the experimental results. The extension of this idea to oil-in-water emulsions is discussed.