Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session M07: Microscale Flows: Emulsions
8:00 AM–9:57 AM,
Tuesday, November 20, 2018
Georgia World Congress Center
Room: B212
Chair: Myeongsub Kim, Florida Atlantic University
Abstract ID: BAPS.2018.DFD.M07.7
Abstract: M07.00007 : Probing the interfacial rheology of complex emulsions using microfluidic droplet deformation dynamics*
9:18 AM–9:31 AM
Presenter:
Shweta Narayan
(University of Minnesota)
Authors:
Shweta Narayan
(University of Minnesota)
Davis B Moravec
(Donaldson Company)
Brad G. Hauser
(Donaldson Company)
Andrew J. Dallas
(Donaldson Company)
Cari Dutcher
(University of Minnesota)
Chemically stabilized emulsions can often be difficult to separate, since diffusion of surfactant molecules from the bulk and their subsequent adsorption at the liquid-liquid interface reduces the interfacial tension between the two phases, leading to increased emulsion stability. Additionally, surfactant molecules can render the interface viscoelastic, posing a challenge for coalescence of droplets. Here we present a microfluidic platform for investigating the fundamental physical properties affecting coalescence of surfactant-stabilized liquid-liquid interfaces. In previous work, a dynamic microfluidic tensiometer was used to measure the time-dependent interfacial tension from deformation of droplets traveling through a contraction geometry. To further investigate the interfacial rheology of surfactant-stabilized emulsions, a microfluidic platform is used to perturb droplet shape. The shape relaxation dynamics can be correlated with interfacial moduli on length and time scales relevant to emulsion separation applications. The results of this work will be used to infer properties of complex emulsions which can impact the coalescence behavior of micron-scale droplets and the subsequent separation of these emulsions.
*This work is funded by Donaldson Company (Bloomington, MN).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.M07.7
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