TY  - CONF
AU  - Brito, Mariano
TI  - Deswelling effects on transport properties of ionic microgel suspensions
M1  - FZJ-2020-01594
PY  - 2019
AB  - 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 study theoretically 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 a Poisson-Boltzmann cell model [2], and a multi-colloid center based thermodynamic perturbation method [3]. In combination with an  effective interaction potential for spherical ionic microgels derived by Denton [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 high-frequency viscosity. As a consequence of the concentration-dependent deswelling, the collective diffusion of ionic microgels is enhanced while the suspension viscosity is lowered. We finally discuss charge-renormalization effects in ionic microgels.References[1]	M. Brito, J. Riest, 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).
T2  - International Soft Matter Conference 2019
CY  - 3 Jun 2019 - 7 Jun 2019, Edinburgh (UK)
Y2  - 3 Jun 2019 - 7 Jun 2019
M2  - Edinburgh, UK
LB  - PUB:(DE-HGF)24
UR  - https://juser.fz-juelich.de/record/874678
ER  -