Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session D28: GSNP Student and Postdoc Speaker Awards
3:00 PM–5:48 PM,
Monday, March 4, 2024
Room: 101I
Sponsoring
Unit:
GSNP
Chair: Shima Parsa, RIT
Abstract: D28.00013 : Glass transition dynamics in size-asymmetric ternary mixtures of hard spheres: Variation from fragile to strong glasses*
5:24 PM–5:36 PM
Presenter:
Ankit Singh
(Banaras Hindu University)
Authors:
Ankit Singh
(Banaras Hindu University)
Yashwant Singh
(Banaras Hindu University)
Collaboration:
Ankit Singh
solvent of much smaller-sized particles. The solvent degrees of freedom are traced out from the grand partition
function of the colloid-solvent mixture which reduces the system from ternary to effective binary mixture of
colloidal particles. In the effective binary mixture colloidal particles interact via effective potential that consists
of bare potential plus the solvent-induced interaction. Expressions for the effective potentials and pair correlation
functions are derived. We used the result of pair correlation functions to determine the number of particles in
a cooperatively reorganizing cluster (CRC) in which localized particles form “long-lived” nonchemical bonds
with the central particle. For an event of relaxation to take place these bonds have to reorganize irreversibly, the
energy involved in the processes is the effective activation energy of relaxation. Results are reported for hard
sphere colloidal particles dispersed in a solvent of hard sphere particles. Our results show that the concentration
of solvent can be used as a control parameter to fine-tune the microscopic structural ordering and the size of
CRC that governs the glassy dynamics. We show that a small variation in the concentration of solvent creates
a bigger change in the kinetic fragility which highlights a wide variation in behavior, ranging from fragile to
strong glasses. We conclude that the CRC which is determined from the static pair correlation function and the
fluctuations embedded in the system is probably the sole player in the physics of glass transition.
*A.S. acknowledges support from a research fellowshipfrom the Council of Scientific and Industrial Research, NewDelhi, India.
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