Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session L37: Rheology II
8:00 AM–10:23 AM,
Monday, November 20, 2023
Room: 203AB
Chair: Mona Kanso, Massachusetts Institute of Technology
Abstract: L37.00001 : Charge Regulation Modulates Polyelectrolyte Viscoelasticity
8:00 AM–8:13 AM
Presenter:
J. Pedro de Souza
(Princeton University)
Authors:
J. Pedro de Souza
(Princeton University)
Jonghyun Hwang
(Princeton University)
Pia DiCenzo
(Princeton University)
Howard A Stone
(Princeton University)
Here, we evaluate the roles of charge regulation via ionic adsorption and ionic screening on the rheological properties of aqueous polyelectrolyte solutions. Using steady shear and small amplitude oscillatory shear experiments, the viscoelasticity of polyelectrolyte solutions are probed with varying salt and polyelectrolyte concentrations, salt and polyelectrolyte identities, and pH. The behavior of polyelectrolytes with acid-base chemistry are contrasted with those that bind salt counterions through salt-specific reactions. We develop a theoretical model for dilute polyelectrolyte solutions, coupling polyelectrolyte extension to electrostatic interactions and ionic adsorption reactions, which is required in order to capture the trends across salts and polyelectrolytes. Ultimately, our analysis supports a framework in which the mechanics of viscoelastic fluid flow is coupled to microscopic electrostatic interactions that are modulated by the specific chemistry of the polyelectrolyte charge groups.
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