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Spring 2019 Seminars

January 7, 2019
January 14, 2019
January 21, 2019<Martin Luther King, Jr. Day>
January 28, 2019A Physicist’s Journey to a Career in Software EngineeringWyatt Davis
February 4, 2019How can molecular simulation help us understand the onset of order during the nucleation process?<CANCELLED due to snow>Caroline Degranges
February 8, 2019Uncovering the Mysteries of Disease Deep Inside the Living Brain

Melanie Martin
February 11, 2019Transition to turbulence in blood flows: Insights from numerical simulation.Trung Bao Le
February 18, 2019<Presidents' Day>
February 25, 2019<Ph.D. Defence!>The relationship between cognitive reflection and performance in physicsCody Getty
March 4, 2019<APS March Meeting>
March 11, 2019<Spring Break>

March 18, 2019

<TBA>The Role of Ion-Ion Correlations for the Differential Capacitance of Ionic LiquidsRachel Downing
March  25, 2019
April 1, 2019
April 8, 2019Computational Modeling of Photo-Physics and Excited-State Dynamics in Inorganic Lead Halide Perovskite Nanocrystals: Using the Polaron as an Efficient Infrared Emission

Aaron Forde

April 15, 2019

<TBA>Mahmud Sefannaser
April 22, 2019<Spring Recess>
April 29, 2019<Dead Week>Deswelling Effect on Structural and Dynamic Properties of Ionic Microgel SuspensionsMariano Brito
May 6, 2019<Finals Week>
May 20, 2019Luben Gomez


Deswelling Effect on Structural and Dynamic Properties of Ionic Microgel Suspensions
Mariano Brito

Graduate Student,
Institute of Complex Systems,
Forschungszentrum Jülich, Germany


Monday, April 29, 3:00-4:00pm, 221 South Engineering

Refreshments at 2:30

Microgels are solvent-containing, cross-linked polymer networks of colloidal size that can reversibly swell or deswell in response to external stimuli. Ionic microgels, in particular, are highly sensitive to changes in environmental conditions such as temperature, solvent quality, polymer cross-linking, suspension ionic strength and particle concentration, which allows for controlling their size and effective interaction. In this work, we theoretically study the effects of concentration-dependent deswelling of weakly-crosslinked ionic microgels on dynamic and structural suspension properties [1]. We use and compare two different theoretical approaches to calculate the equilibrium microgel size, namely the Denton-Tang method based on Poisson-Boltzmann cell model [2], and a multiparticle-based thermodynamic perturbation method [3]. In combination with an effective interaction potential for spherical ionic microgels [4], we compute static pair correlation functions and structure factors. These are used as input in our calculations of dynamic suspension properties including the hydrodynamic function, collective diffusion coefficient, and low- and high-frequency viscosities. As a consequence of the concentration-dependent deswelling, we show how the collective diffusion is enhanced while the viscosity is lowered in suspensions of ionic microgels.

[1] M. Brito, A. R. Denton and G. Nägele, to be submitted.
[2] A. R. Denton and Qiyun Tang, J. Chem. Phys. 145, 164901 (2016).
[3] T. J. Weyer and A. R. Denton, Soft Matter 14, 4530 (2018).
[4] A. R. Denton, Phys. Rev. E 67, 011804 (2003).

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