5 papers
Mapping bimodal colloidal depletion systems onto the monodisperse gelation phase diagram
Robert A. Campbell, Ziye Zhuang, Ali Mohraz +1
Many industries rely on models of colloidal gelation and phase behavior to predict how processing equipment will handle new product formulations. In colloidal systems with nearly u…
Rheology and Dynamic Arrest in Colloidal Depletion Gels Mediated by Surface Brush Density
Ziye Zhuang, Robert A. Campbell, Safa Jamali +1
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 ge…
Size matters more than packing in bimodal colloidal gel compositions
Robert A. Campbell, Ziye Zhuang, Ali Mohraz +1
Colloidal gels are frequently modeled as monodisperse particle networks, although practical formulations commonly contain particles with multiple characteristic sizes. Here, we use…
Bimodal colloids highlight the structural mirror of rigidity percolation and yielding
Robert A. Campbell, Ziye Zhuang, Ali Mohraz +1
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…
Brush-mediated angular constraints reshape structure, rigidity, and percolation in colloidal depletion gels
Ziye Zhuang, Robert A. Campbell, Paniz Haghighi +2
Colloidal gels, like many other soft and disordered solids derive their mechanical properties not only from the strength of interparticle attraction, but also from the symmetry of…