Overcoming rheological challenges associated with delivering active motion to colloidal gels
Active matter is a relatively new area of matter that consists of self-propelling particles. The motion of these particles can have profound effects on their environment. Understanding these effects is crucial for realizing the many potential applications of active matter including areas such as self-healing electronics, environmental remediation, and multi-state materials.
Here, we specifically explore the rheological implications of active matter on colloidal gels – an industrially relevant and model gel system. However, because the active particle system used produces oxygen, bubbles can form and interfere with the sample when in confined spaces as in rheological measurements. In this webinar, we describe some of the successful (and unsuccessful) modifications that allow for the rheological characterization of colloidal gels with embedded active particles. We additionally describe the effect of active matter on the linear and nonlinear rheology of colloidal gels.
Keara Saud is currently a Ph.D. candidate in the Department of Materials Science and Engineering at the University of Michigan. She has been working with Dean Michael J. Solomon since 2016. Her work focuses on characterizing the rheological and microdynamical effects of active matter in both colloidal gels and colloidal crystals.
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