Author

Safa Jamali

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Preprint Aug 2026

Rheology and Dynamic Arrest in Colloidal Depletion Gels Mediated by Surface Brush Density

We use the density of surface-grafted polymers as a geometry-preserving control parameter for tuning the rheology of colloidal depletion gels. Reducing brush density accelerates gelation and produces gels with higher plateau storage modulus and yield stress. This mechanical enhancement is not accompanied by increased l...

Zi-Ye Zhuang, Robert A. A. Campbell, Safa Jamali et al. · 0 citations

Preprint Jul 2026

Bimodal colloids highlight the structural mirror of rigidity percolation and yielding

In metastable particulate gels, it is tempting to believe that the dynamic similarities between the fluid-to-solid non-linear phase transition of rigidity percolation and the solid-to-fluid transition that occurs during yielding represent mirror images of the same continuous process. Even though these behaviors are cle...

Robert A. A. Campbell, Ziye Zhuang, A. Mohraz et al. · 0 citations

Preprint Aug 2026

Size matters more than packing in bimodal colloidal gel compositions

Colloidal gels are frequently modeled as monodisperse particle networks, although practical formulations commonly contain particles with multiple characteristic sizes. Here, we use large-scale, hydrodynamically resolved simulations of colloidal depletion gels to isolate the effects of particle size and local packing in...

Robert A. A. Campbell, Zi-Ye Zhuang, A. Mohraz et al. · 0 citations