Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, India
"Diffusion-Entropy Relationship in Chemistry and
Biology: A Molecular Perspective"
Relationship between entropy and relaxation has been a subject of inquiry
since the time of Boltzmann who introduced his famous H-Theorem in 1872
(150 years ago!) and remarked on its relation with entropy. This relationship
has been further established through Adam-Gibbs relation and later Rosenfeld
scaling. We shall discuss the elegant derivation of Adam-Gibbs by Random
First Order Theory (RFOT). Subsequently, we shall discuss a derivation of the
diffusion-entropy scaling in a rugged energy landscape, and in a two-
dimensional periodic lattice, using the multidimensional rate theory. We shall
discuss a two-dimensional periodic system that displays interesting coherences
in trajectories, leading to a non-monotonic friction dependence of diffusion.
We discuss a simple random walk model that surprisingly could capture the
non-monotonicity of diffusion (partly) and the behaviour at large friction
(quantitatively). We shall also discuss, if time permits, a few biophysical
problems that we are studying in our group.
Visit the Bagchi lab.
Refreshments following the seminar in Laufer Hub 110