Nature of the entropy versus self-diffusivity plot for simple liquids.
The empirical relation (D(*))(alpha) = a exp[S] between the self-diffusion coefficient D(*) and the excess entropy S of a liquid is studied here in the context of theoretical model calculation. The coefficient alpha is dependent on the interaction potential and shows a crossover at an intermediate density, where cooperative dynamics become more important. Around this density a departure from the Stokes-Einstein relation is also observed. The above relation between entropy and diffusion is also tested for the scaled total diffusion coefficient in a binary mixture.
Kaur
Charanbir
C
School of Physical Sciences, Jawaharlal Nehru University, New Delhi, India.
Harbola
Upendra
U
Das
Shankar P
SP