Insights into the microscale coalescence behavior of surfactant-stabilized droplets using a microfluidic hydrodynamic trap

Langmuir : the ACS Journal of Surfaces and Colloids
Shweta NarayanCari S Dutcher

Abstract

Coalescence of micrometer-scale droplets is impacted by several parameters, including droplet size, viscosities of the two phases, droplet velocity, angle of approach, as well as interfacial tension and surfactant coverage. The thinning dynamics of films between coalescing droplets can be particularly complex in the presence of surfactants, due to the generation of Marangoni stresses and reduced film mobility. Here, a microfluidic hydrodynamic "Stokes" trap is used to gently steer and trap surfactant-laden micrometer-sized droplets at the center of a cross-slot. Water droplets are formed upstream of the cross-slot using a microfluidic T-junction, in heavy and light mineral oils and stabilized using SPAN 80, an oil-soluble surfactant. Incoming droplets are made to coalesce with the trapped droplet, yielding measurements of the film drainage time. Film drainage times are measured as a function of continuous phase viscosity, incoming droplet speed, trapped droplet size, and surfactant concentrations above and below the critical micelle concentration (CMC). As expected, systems with higher surfactant concentrations, and slower incoming droplet speed exhibit longer film drainage times. At low surfactant concentrations, the drainage ...Continue Reading

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Citations

Feb 21, 2021·Annual Review of Physical Chemistry·Priyatanu RoyCari S Dutcher
Apr 30, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Rui LiRogerio Manica
Jul 17, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Huy-Hong-Quan DinhFrançois Lequeux
Dec 4, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Yun ChenCari S Dutcher

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