Zooming in on the role of surfactants in droplet coalescence at the macroscale and microscale |
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| Institution: | 1. Department of Mechanical Engineering, University of Minnesota – Twin Cities, 111 Church Street SE, Minneapolis, MN, 55455, USA;2. Department of Chemical Engineering and Materials Science, University of Minnesota – Twin Cities, 421 Washington Avenue SE, Minneapolis, MN, 55455, USA;1. CEA, DEN, MAR, DMRC, SA2I, BP 17171, F-30207 Bagnols-sur-Cèze, France;2. Université Claude Bernard Lyon 1, CNRS, UMR 5007, LAGEP, 43 bd 11 Novembre 1918, FR-69622 Villeurbanne, France;3. Politecnico di Torino, Dipartimento di Scienza Applicate e Tecnologie, Corso Duca degli Abruzzi 24, IT-10129 Torino, Italy;1. College of Mechanical and Electronic Engineering, China University of Petroleum (East China), Qingdao 266580, China;2. College of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China;1. School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China;2. School of Materials Science and Engineering of UPC, China University of Petroleum (East China), Qingdao 266580, China;3. State Key Laboratory of Heavy Oil, China University of Petroleum (East China), Qingdao 266580, China |
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| Abstract: | Coalescence of dispersed micrometer-scale droplets is an essential step toward the separation of emulsions. The thin film between droplets must form, drain, and rupture for coalescence to occur. In surfactant-stabilized emulsions, the film drainage and droplet coalescence processes are known to be hindered because of reduced interfacial mobility. However, a clear correlation between this mobility and the underlying surfactant transport and interfacial response to shear and dilatational deformations is undercharacterized. For microscale droplets, the effect of surfactant transport to the interface and along the interface is often difficult to isolate from other bulk effects on emulsion stability. In this work, we review surfactant-mitigated coalescence in both macroscale and microscale experiments, highlighting the importance of interfacial curvature and length scales when establishing a correlation between coalescence theory and film mobility. |
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| Keywords: | Surfactants Thin films Droplets Coalescence Interfacial rheology |
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