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

doi:10.1016/j.cjche.2019.12.010

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (5): 1368-1374.DOI: 10.1016/j.cjche.2019.12.010

• Chemical Engineering Thermodynamics • 上一篇下一篇

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

An Chen¹, Shaowei Li², Jianhong Xu¹

1 The State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;
2 Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China

收稿日期:2019-09-17 修回日期:2019-12-07 出版日期:2020-05-28 发布日期:2020-07-29
通讯作者: Shaowei Li, Jianhong Xu
基金资助:
The authors gratefully acknowledge the supports of the National Natural Science Foundation of China (21476121, 21322604) for this work.

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

An Chen¹, Shaowei Li², Jianhong Xu¹

1 The State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;
2 Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China

Received:2019-09-17 Revised:2019-12-07 Online:2020-05-28 Published:2020-07-29
Contact: Shaowei Li, Jianhong Xu
Supported by:
The authors gratefully acknowledge the supports of the National Natural Science Foundation of China (21476121, 21322604) for this work.

摘要/Abstract

摘要： 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.

关键词: Emulsions, Stabilization mechanism, Interactions, Polymers, Optical tweezers

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.

Key words: Emulsions, Stabilization mechanism, Interactions, Polymers, Optical tweezers

An Chen, Shaowei Li, Jianhong Xu. A novel approach to study the interactions between polymeric stabilized micron-sized oil droplets by optical tweezers[J]. 中国化学工程学报, 2020, 28(5): 1368-1374.

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.

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

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

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