Non-Maxwellian viscoelastic stress relaxations in soft matter

J Song, N Holten-Andersen, GH McKinley - Soft Matter, 2023 - pubs.rsc.org
Viscoelastic stress relaxation is a basic characteristic of soft matter systems such as colloids,
gels, and biological networks. Although the Maxwell model of linear viscoelasticity provides …

Modulating noncovalent cross-links with molecular switches

ES Epstein, L Martinetti, RH Kollarigowda… - Journal of the …, 2019 - ACS Publications
Spiropyran molecular switches, in conjunction with transition metal ions, are shown to
operate as reversible polymer cross-linkers. Solutions containing a spiropyran …

Medium amplitude parallel superposition (MAPS) rheology. Part 1: Mathematical framework and theoretical examples

KR Lennon, GH McKinley, JW Swan - Journal of Rheology, 2020 - pubs.aip.org
A new mathematical representation for nonlinear viscoelasticity is presented based on the
application of the Volterra series expansion to the general nonlinear relationship between …

[HTML][HTML] Thixotropic spectra and Ashby-style charts for thixotropy

S Sen, RH Ewoldt - Journal of Rheology, 2022 - pubs.aip.org
There is no universal model for thixotropy, and comparing thixotropic effects between
different fluids is a subtle yet challenging problem. We introduce a generalized (model …

[HTML][HTML] Time-strain separability in medium-amplitude oscillatory shear

L Martinetti, RH Ewoldt - Physics of fluids, 2019 - pubs.aip.org
We derive and study equations for the weakly nonlinear medium-amplitude oscillatory shear
(MAOS) response of materials exhibiting time-strain separability. Results apply to …

Can numerical methods compete with analytical solutions of linear constitutive models for large amplitude oscillatory shear flow?

S Mittal, YM Joshi, S Shanbhag - Rheologica Acta, 2024 - Springer
We consider the corotational Maxwell model which is perhaps the simplest constitutive
model with a nontrivial oscillatory shear response that can be solved analytically. The exact …

Molecular Design of Multimodal Viscoelastic Spectra Using Vitrimers

LE Porath, N Ramlawi, J Huang, MT Hossain… - Chemistry of …, 2024 - ACS Publications
Imparting multiple, distinct dynamic processes at precise time scales in polymers is a grand
challenge in soft materials design with implications for applications including electrolytes …

The discrete and continuous retardation and relaxation spectrum method for viscoelastic characterization of warm mix crumb rubber-modified asphalt mixtures

F Zhang, L Wang, C Li, Y Xing - Materials, 2020 - mdpi.com
To study the linear viscoelastic (LVE) of crumb rubber-modified asphalt mixtures before and
after the warm mix additive was added methods of obtaining the discrete and continuous …

A hierarchical Bayesian approach to regularization with application to the inference of relaxation spectra

SR Kedari, G Atluri, K Vemaganti - Journal of Rheology, 2022 - pubs.aip.org
The inference of the spectral function representing the relaxation process of a material is an
ill-posed problem and regularization is key to solving such problems. Significant information …

On simultaneous fitting of nonlinear and linear rheology data: Preventing a false sense of certainty

PK Singh, RH Ewoldt - arXiv preprint arXiv:2202.02867, 2022 - arxiv.org
Uncertainty propagates through calculations, down to molecular scales to infer
microstructural features, and up to macroscopic scales with predictive flow simulations. Here …