Spring 2019 Seminars
|January 7, 2019|
|January 14, 2019|
|January 21, 2019||<Martin Luther King, Jr. Day>|
|January 28, 2019||A Physicist’s Journey to a Career in Software Engineering||Wyatt Davis|
|February 4, 2019||How can molecular simulation help us understand the onset of order during the nucleation process?<CANCELLED due to snow>||Caroline Degranges|
|February 8, 2019||Uncovering the Mysteries of Disease Deep Inside the Living Brain||Melanie Martin|
|February 11, 2019||Transition 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 physics||Cody 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 Liquids||Rachel Downing|
|March 25, 2019|
|April 1, 2019|
|April 8, 2019||Computational 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
|April 22, 2019||<Spring Recess>|
|April 29, 2019||<Dead Week>Deswelling Effect on Structural and Dynamic Properties of Ionic Microgel Suspensions||Mariano Brito|
|May 6, 2019||<Finals Week>|
|May 20, 2019||Luben Gomez|
Deswelling Effect on Structural and Dynamic Properties of Ionic Microgel Suspensions
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 . 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 , and a multiparticle-based thermodynamic perturbation method . In combination with an effective interaction potential for spherical ionic microgels , 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.
 M. Brito, A. R. Denton and G. Nägele, to be submitted.
 A. R. Denton and Qiyun Tang, J. Chem. Phys. 145, 164901 (2016).
 T. J. Weyer and A. R. Denton, Soft Matter 14, 4530 (2018).
 A. R. Denton, Phys. Rev. E 67, 011804 (2003).
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