Colloidal suspensions consist of micrometer-sized particles that remain suspended in a fluid by Brownian motion. Their phase behavior bears striking similarities with atomic systems and for suitable particle number densities, colloidal suspensions readily form liquid, glass, and crystalline phases. This combined with their large size, which allows direct interrogation of their dynamics in real-space and at the single-particle level, makes them ideal candidates to address problems in statistical and condensed matter physics. In the first part of my talk, I will present results from a recent real-space imaging study that shows how a glass can transform to a crystal despite the dynamics in the glass being frozen at the particle length scale. In the second part of my talk, I will describe experiments where we critically evaluated competing theories of the glass transition by probing the dynamics of dense liquids residing on the surface of a sphere.
Rajesh Ganapathy (Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore)
Date & Time
Mon, 14 December 2020, 15:30 to 17:00