We investigate the short-time vibrational properties and structure of two-dimensional, bidisperse, colloidal glasses and supercooled liquids in the vicinity of the re-entrant glass transition, as a function of interparticle depletion attraction strength. The long-time spatiotemporal dynamics of the samples are measured to be non-monotonic, confirming that the suspensions evolve from repulsive glass to supercooled liquid to attractive glass with increasing depletion attraction. Here, we search for vibrational signatures of the re-entrant behavior in the short-time spatiotemporal dynamics, i.e., dynamics associated with particle motion inside its nearest-neighbor cage. Interestingly, we observe that the anharmonicity of these in-cage vibrations varies non-monotonically with increasing attraction strength, consistent with the non-monotonic long-time structural relaxation dynamics of the re-entrant glass. We also extract effective spring constants between neighboring particles; we find that spring stiffness involving small particles also varies non-monotonically with increasing attraction strength, while stiffness between large particles increases monotonically. Last, from study of depletion-dependent local structure and vibration participation fractions, we gain microscopic insight into the particle-size-dependent contributions to short-time vibrational modes in the glass and supercooled liquid states.
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21 August 2021
Research Article|
August 17 2021
Structural and short-time vibrational properties of colloidal glasses and supercooled liquids in the vicinity of the re-entrant glass transition
Special Collection:
Depletion Forces and Asakura-Oosawa Theory
Xiaoguang Ma
;
Xiaoguang Ma
a)
1
Center for Complex Flows and Soft Matter Research, Southern University of Science and Technology
, Shenzhen, Guangdong 518055, China
2
Department of Physics, Southern University of Science and Technology
, Shenzhen, Guangdong 518055, China
a)Author to whom correspondence should be addressed: [email protected]
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Chandan K. Mishra
;
Chandan K. Mishra
3
Discipline of Physics, Indian Institute of Technology (IIT) Gandhinagar Palaj
, Gandhinagar, Gujarat 382355, India
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P. Habdas;
P. Habdas
4
Department of Physics, Saint Joseph’s University
, Philadelphia, Pennsylvania 19131, USA
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A. G. Yodh
A. G. Yodh
5
Department of Physics and Astronomy, University of Pennsylvania
, Philadelphia, Pennsylvania 19104, USA
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a)Author to whom correspondence should be addressed: [email protected]
Note: This paper is part of the JCP Special Topic on Depletion Forces and Asakura–Oosawa Theory.
J. Chem. Phys. 155, 074902 (2021)
Article history
Received:
June 05 2021
Accepted:
August 02 2021
Citation
Xiaoguang Ma, Chandan K. Mishra, P. Habdas, A. G. Yodh; Structural and short-time vibrational properties of colloidal glasses and supercooled liquids in the vicinity of the re-entrant glass transition. J. Chem. Phys. 21 August 2021; 155 (7): 074902. https://doi.org/10.1063/5.0059084
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