A novel approach to study the interactions between polymeric stabilized micron-sized oil droplets by optical tweezers

An Chen; Shaowei Li; Jianhong Xu

doi:10.1016/j.cjche.2019.12.010

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A novel approach to study the interactions between polymeric stabilized micron-sized oil droplets by optical tweezers

Chemical Engineering Thermodynamics | Updated：2026-01-06

- A novel approach to study the interactions between polymeric stabilized micron-sized oil droplets by optical tweezers
- Chinese Journal of Chemical Engineering Vol. 28, Issue 5, Pages: 1368-1374(2020)
- Affiliations：
  
  1. The State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University,Beijing,China,100084
  2. Institute of Nuclear and New Energy Technology, Tsinghua University,Beijing,China,100084
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2019.12.010
  CLC：
- Published：2020
- Accepted：
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An Chen, Shaowei Li, Jianhong Xu. A novel approach to study the interactions between polymeric stabilized micron-sized oil droplets by optical tweezers[J]. Chinese Journal of Chemical Engineering, 2020, 28(5): 1368-1374.
DOI：

An Chen, Shaowei Li, Jianhong Xu. A novel approach to study the interactions between polymeric stabilized micron-sized oil droplets by optical tweezers[J]. Chinese Journal of Chemical Engineering, 2020, 28(5): 1368-1374. DOI： 10.1016/j.cjche.2019.12.010.

摘要

Abstract

The well understanding of interaction forces between single dispersed droplets is crucial to the understanding of emulsion stabilization mechanism. Recently

many studies have reported the direct quantitative measurements of interaction forces between 20-200 μm single droplet coated polymers by atomic force microscope (AFM). These studies have revealed many important results about the relationship of the interaction forces and the droplet deformation. However

these studies of the quantitative relationship between the measured interaction forces and the separation distance of the front end of the droplet have rarely been reported. Optical tweezer instrument can make it possible to establish the quantitative relationship between the measured force and the separation distance of the front end of the droplet

which will make better understanding of the interaction mechanisms between droplets. Due to the differences of the measuring mechanism between atomic force microscopy (AFM) and optical tweezers

the theory model of AFM measurements cannot be fitted with the force measurement by optical tweezers. We have made an exhaustive comparison of the measuring differences between AFM and optical tweezer instrument in this work. Moreover

we built a numerical model to derive the repulsive pressure through the measured force curve in order to quantify the measured force of two micron-sized oil droplet coated polymers by optical tweezers. Furthermore

the novel method can be extended to other micron-sized emulsion systems

and these findings will be a vital progress on quantitative force measurements between micron-sized droplets.

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