Active and passive microrheology: Theory and simulation

RN Zia - Annual Review of Fluid Mechanics, 2018 - annualreviews.org
Microrheological study of complex fluids traces its roots to the work of the botanist Robert
Brown in the early nineteenth century. Indeed, passive microrheology and Brownian motion …

Data-driven physics-informed constitutive metamodeling of complex fluids: A multifidelity neural network (MFNN) framework

M Mahmoudabadbozchelou, M Caggioni… - Journal of …, 2021 - pubs.aip.org
In this work, we introduce a comprehensive machine-learning algorithm, namely, a
multifidelity neural network (MFNN) architecture for data-driven constitutive metamodeling of …

Lagrangian-based simulation method using constrained Stokesian dynamics for particulate flows in microchannel

YJ Lee, H **, DY Kim, S Kang, KH Ahn - Journal of Fluid Mechanics, 2024 - cambridge.org
A simulation method has been developed to efficiently evaluate the motion of colloidal
particles in a low-Reynolds-number confined microchannel flow using a Lagrangian-based …

Gravitational collapse of colloidal gels: non-equilibrium phase separation driven by osmotic pressure

P Padmanabhan, R Zia - Soft Matter, 2018 - pubs.rsc.org
Delayed gravitational collapse of colloidal gels is characterized by initially slow compaction
that gives way to rapid bulk collapse, posing interesting questions about the underlying …

Confined Brownian suspensions: Equilibrium diffusion, thermodynamics, and rheology

AM Sunol, RN Zia - Journal of Rheology, 2023 - pubs.aip.org
We examine the impact of confinement on the structure, dynamics, and rheology of
spherically confined macromolecular suspensions, with a focus on the role played by …

[HTML][HTML] The non-Newtonian rheology of hydrodynamically interacting colloids via active, nonlinear microrheology

HCW Chu, RN Zia - Journal of Rheology, 2017 - pubs.aip.org
The non-Newtonian rheology of a dilute suspension of hydrodynamically interacting colloids
is studied theoretically via active, nonlinear microrheology. In this Stokes-flow regime, a …

Particulate fouling simulation in unit micropore using a hydrodynamically coupled Lagrangian framework

YJ Lee, DY Kim, KH Ahn - Desalination, 2025 - Elsevier
Predicting and mitigating pore clogging is challenging for the sustainable operation of water
treatment systems. During transport and filtration through membrane micropores, buoyant …

Toward a nonequilibrium Stokes-Einstein relation via active microrheology of hydrodynamically interacting colloidal dispersions

HCW Chu, RN Zia - Journal of colloid and interface science, 2019 - Elsevier
We derive a theoretical model for the nonequilibrium stress in a flowing colloidal suspension
by tracking the motion of a single embedded probe. While Stokes-Einstein relations connect …

Parallel accelerated Stokesian dynamics with Brownian motion

GY Ouaknin, Y Su, RN Zia - Journal of Computational Physics, 2021 - Elsevier
We present scalable algorithms to simulate large-scale stochastic particle systems
amenable for modeling dense colloidal suspensions, glasses and gels. To handle the large …

Sticky, active microrheology: Part 1. Linear-response

DE Huang, RN Zia - Journal of colloid and interface science, 2019 - Elsevier
Attractive colloidal-scale forces between macromolecules in biological fluids are suspected
to play a role in important system dynamics, including association times, spatially …