1
|
Kipnusu WK, Elsayed M, Iacob C, Pawlus S, Krause-Rehberg R, Paluch M. Glassy dynamics predicted by mutual role of free and activation volumes. SOFT MATTER 2019; 15:4656-4661. [PMID: 31149697 DOI: 10.1039/c9sm00363k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Broadband Dielectric Spectroscopy (BDS) at elevated pressures and Positron Annihilation Lifetime Spectroscopy (PALS) are employed to elucidate the importance of the ratio of activation and free volumes during vitrification. We show that this ratio has a linear correlation with the structural relaxation of glass forming liquids in a wide temperature range hence engendering it as a vital input in the description of the dynamic glass transition.
Collapse
Affiliation(s)
- Wycliffe K Kipnusu
- GROC UJI, Institute of New Imaging Technologies, Department of Physics, Universitat Jaume I, Avda. Sos Baynat s/n, 12071 Castellón, Spain.
| | | | | | | | | | | |
Collapse
|
2
|
Ultrastable glasses portray similar behaviour to ordinary glasses at high pressure. Sci Rep 2016; 6:34296. [PMID: 27694814 PMCID: PMC5046104 DOI: 10.1038/srep34296] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Accepted: 08/22/2016] [Indexed: 01/19/2023] Open
Abstract
Pressure experiments provide a unique opportunity to unravel new insights into glass-forming liquids by exploring its effect on the dynamics of viscous liquids and on the evolution of the glass transition temperature. Here we compare the pressure dependence of the onset of devitrification, Ton, between two molecular glasses prepared from the same material but with extremely different ambient-pressure kinetic and thermodynamic stabilities. Our data clearly reveal that, while both glasses exhibit different dTon/dP values at low pressures, they evolve towards closer calorimetric devitrification temperature and pressure dependence as pressure increases. We tentatively interpret these results from the different densities of the starting materials at room temperature and pressure. Our data shows that at the probed pressures, the relaxation time of the glass into the supercooled liquid is determined by temperature and pressure similarly to the behaviour of liquids, but using stability-dependent parameters.
Collapse
|
3
|
Charbonneau P, Jin Y, Parisi G, Rainone C, Seoane B, Zamponi F. Numerical detection of the Gardner transition in a mean-field glass former. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2015; 92:012316. [PMID: 26274170 DOI: 10.1103/physreve.92.012316] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Indexed: 06/04/2023]
Abstract
Recent theoretical advances predict the existence, deep into the glass phase, of a novel phase transition, the so-called Gardner transition. This transition is associated with the emergence of a complex free energy landscape composed of many marginally stable sub-basins within a glass metabasin. In this study, we explore several methods to detect numerically the Gardner transition in a simple structural glass former, the infinite-range Mari-Kurchan model. The transition point is robustly located from three independent approaches: (i) the divergence of the characteristic relaxation time, (ii) the divergence of the caging susceptibility, and (iii) the abnormal tail in the probability distribution function of cage order parameters. We show that the numerical results are fully consistent with the theoretical expectation. The methods we propose may also be generalized to more realistic numerical models as well as to experimental systems.
Collapse
Affiliation(s)
- Patrick Charbonneau
- Department of Chemistry, Duke University, Durham, North Carolina 27708, USA
- Department of Physics, Duke University, Durham, North Carolina 27708, USA
| | - Yuliang Jin
- Department of Chemistry, Duke University, Durham, North Carolina 27708, USA
- Dipartimento di Fisica, Sapienza Universitá di Roma, INFN, Sezione di Roma I, IPFC - CNR, Piazzale Aldo Moro 2, I-00185 Roma, Italy
- LPT, École Normale Supérieure, UMR 8549 CNRS, 24 Rue Lhomond, 75005 Paris, France
| | - Giorgio Parisi
- Dipartimento di Fisica, Sapienza Universitá di Roma, INFN, Sezione di Roma I, IPFC - CNR, Piazzale Aldo Moro 2, I-00185 Roma, Italy
| | - Corrado Rainone
- Dipartimento di Fisica, Sapienza Universitá di Roma, INFN, Sezione di Roma I, IPFC - CNR, Piazzale Aldo Moro 2, I-00185 Roma, Italy
- LPT, École Normale Supérieure, UMR 8549 CNRS, 24 Rue Lhomond, 75005 Paris, France
| | - Beatriz Seoane
- Dipartimento di Fisica, Sapienza Universitá di Roma, INFN, Sezione di Roma I, IPFC - CNR, Piazzale Aldo Moro 2, I-00185 Roma, Italy
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), 50009 Zaragoza, Spain
| | - Francesco Zamponi
- LPT, École Normale Supérieure, UMR 8549 CNRS, 24 Rue Lhomond, 75005 Paris, France
| |
Collapse
|