Viscoelasticity and dynamical gaps: Rigidity in crystallization and glass-forming liquids
Rigidity plays an important role on the relaxation properties of glass forming melts, yet it is usually determined from the average coordination number through the chemical composition. A discussion is presented on how viscoelasticity can be used as an alternative way to determine glass rigidity and...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2019-09-01
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| Series: | Journal of Non-Crystalline Solids: X |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590159119300433 |
| _version_ | 1818136107419697152 |
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| author | J. Quetzalcóatl Toledo-Marín Gerardo G. Naumis |
| author_facet | J. Quetzalcóatl Toledo-Marín Gerardo G. Naumis |
| author_sort | J. Quetzalcóatl Toledo-Marín |
| collection | DOAJ |
| description | Rigidity plays an important role on the relaxation properties of glass forming melts, yet it is usually determined from the average coordination number through the chemical composition. A discussion is presented on how viscoelasticity can be used as an alternative way to determine glass rigidity and to give clues about the relaxation processes. It is shown that the transverse current dynamical structure factor of dense glass and crystal forming fluids contain rich information about rigidity that can be related with the presence of a dynamical-gap for transversal vibrational-modes. Then, the number of floppy modes can be related with the dynamical gap size and with the liquid relaxation time. Furthermore, a dynamical average effective coordination number can be defined. Numerical simulations for hard-disks in a dense fluid phase are provided. A discussion is presented on the need to improve glass viscoelasticity models to describe consistently non-exponential stress and strain relaxation. Keywords: Viscoelasticity, Relaxation, Rigidity |
| first_indexed | 2024-12-11T09:35:09Z |
| format | Article |
| id | doaj.art-484abfefebe74eeabc7dd8bf6d0de627 |
| institution | Directory Open Access Journal |
| issn | 2590-1591 |
| language | English |
| last_indexed | 2024-12-11T09:35:09Z |
| publishDate | 2019-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Non-Crystalline Solids: X |
| spelling | doaj.art-484abfefebe74eeabc7dd8bf6d0de6272022-12-22T01:12:53ZengElsevierJournal of Non-Crystalline Solids: X2590-15912019-09-013Viscoelasticity and dynamical gaps: Rigidity in crystallization and glass-forming liquidsJ. Quetzalcóatl Toledo-Marín0Gerardo G. Naumis1Departamento de Sistemas Complejos, Instituto de Física, Universidad Nacional Autónoma de México (UNAM), Apartado Postal 20-364, 01000 México, Distrito Federal, MexicoCorresponding author.; Departamento de Sistemas Complejos, Instituto de Física, Universidad Nacional Autónoma de México (UNAM), Apartado Postal 20-364, 01000 México, Distrito Federal, MexicoRigidity plays an important role on the relaxation properties of glass forming melts, yet it is usually determined from the average coordination number through the chemical composition. A discussion is presented on how viscoelasticity can be used as an alternative way to determine glass rigidity and to give clues about the relaxation processes. It is shown that the transverse current dynamical structure factor of dense glass and crystal forming fluids contain rich information about rigidity that can be related with the presence of a dynamical-gap for transversal vibrational-modes. Then, the number of floppy modes can be related with the dynamical gap size and with the liquid relaxation time. Furthermore, a dynamical average effective coordination number can be defined. Numerical simulations for hard-disks in a dense fluid phase are provided. A discussion is presented on the need to improve glass viscoelasticity models to describe consistently non-exponential stress and strain relaxation. Keywords: Viscoelasticity, Relaxation, Rigidityhttp://www.sciencedirect.com/science/article/pii/S2590159119300433 |
| spellingShingle | J. Quetzalcóatl Toledo-Marín Gerardo G. Naumis Viscoelasticity and dynamical gaps: Rigidity in crystallization and glass-forming liquids Journal of Non-Crystalline Solids: X |
| title | Viscoelasticity and dynamical gaps: Rigidity in crystallization and glass-forming liquids |
| title_full | Viscoelasticity and dynamical gaps: Rigidity in crystallization and glass-forming liquids |
| title_fullStr | Viscoelasticity and dynamical gaps: Rigidity in crystallization and glass-forming liquids |
| title_full_unstemmed | Viscoelasticity and dynamical gaps: Rigidity in crystallization and glass-forming liquids |
| title_short | Viscoelasticity and dynamical gaps: Rigidity in crystallization and glass-forming liquids |
| title_sort | viscoelasticity and dynamical gaps rigidity in crystallization and glass forming liquids |
| url | http://www.sciencedirect.com/science/article/pii/S2590159119300433 |
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