Coalescence behavior of oil droplets coated in irreversibly-adsorbed surfactant layers

Journal of Colloid and Interface Science
Matthew D Reichert, Lynn M Walker

Abstract

Coalescence between oil caps with irreversibly adsorbed layers of nonionic surfactant is characterized in deionized water and electrolyte solution. The coalescence is characterized using a modified capillary tensiometer allowing for accurate measurement of the coalescence time. Results suggest two types of coalescence behavior, fast coalescence at low surface coverages that are independent of ionic strength and slow coalescence at high coverage. These slow coalescence events (orders of magnitude slower) are argued to be due to electric double layer forces or more complicated stabilization mechanisms arising from interfacial deformation and surface forces. A simple film drainage model is used in combination with measured values for interfacial properties to quantify the interaction potential between the two interfaces. Since this approach allows the two caps to have the same history, interfacial coverage and curvature, the results offer a tool to better understand a mechanism that is important to emulsion stability.

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Citations

Mar 24, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Stephanie M KirbyLynn M Walker
May 11, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Stephanie M KirbyLynn M Walker
Oct 17, 2016·Journal of Colloid and Interface Science·David A RiehmAlon V McCormick
Oct 3, 2019·Physical Review. E·Rajarshi SenguptaLynn M Walker
Feb 9, 2020·Journal of Colloid and Interface Science·Rajarshi SenguptaLynn M Walker
Mar 30, 2021·Journal of Colloid and Interface Science·Zachary R Hinton, Nicolas J Alvarez
Oct 3, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Michael L Davidson, Lynn M Walker
Apr 25, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Srinivas MettuRaymond R Dagastine
Dec 4, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Yun ChenCari S Dutcher
Jul 23, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Shweta NarayanCari S Dutcher

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