Reconsidering the relation of the JG β-relaxation to the α-relaxation and surface diffusion in ethylcyclohexane

According to the Coupling Model (CM), secondary relaxation belonging to a special class has strong connection to the α-relaxation. These Johari-Goldstein (JG) β-relaxations are predicted to be ubiquitous, and its relaxation time is approximately equal to the primitive relaxation time and the surface...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	K.L. Ngai, S. Capaccioli
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Glass transition ethylcyclohexane surface diffusion Johari-Goldstein relaxation Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/6f41843afe6340fb987371dc56269539
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:6f41843afe6340fb987371dc56269539
record_format	dspace
spelling	oai:doaj.org-article:6f41843afe6340fb987371dc562695392021-11-20T05:13:20ZReconsidering the relation of the JG β-relaxation to the α-relaxation and surface diffusion in ethylcyclohexane2590-159110.1016/j.nocx.2021.100070https://doaj.org/article/6f41843afe6340fb987371dc562695392021-09-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S259015912100011Xhttps://doaj.org/toc/2590-1591According to the Coupling Model (CM), secondary relaxation belonging to a special class has strong connection to the α-relaxation. These Johari-Goldstein (JG) β-relaxations are predicted to be ubiquitous, and its relaxation time is approximately equal to the primitive relaxation time and the surface diffusion time. These predictions cannot be tested directly in ethylcyclohexane (ECH) because the JG β-relaxation is unresolved and overlapping the α-relaxation to modify its dispersion. To capture the actual dispersion of the α-relaxation we considered surface diffusion data, adiabatic calorimetry data of the JG β-relaxation, and dielectric data of cyanocyclohexane (CNCH). We demonstrated the dispersion of the α-relaxation is actually narrower than known before. The primitive relaxation times calculated are now in agreement with τJG(T) and with τsurface(T), and in accord with the CM predictions.K.L. NgaiS. CapaccioliElsevierarticleGlass transitionethylcyclohexanesurface diffusionJohari-Goldstein relaxationMaterials of engineering and construction. Mechanics of materialsTA401-492ChemistryQD1-999ENJournal of Non-Crystalline Solids: X, Vol 11, Iss , Pp 100070- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Glass transition ethylcyclohexane surface diffusion Johari-Goldstein relaxation Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999
spellingShingle	Glass transition ethylcyclohexane surface diffusion Johari-Goldstein relaxation Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999 K.L. Ngai S. Capaccioli Reconsidering the relation of the JG β-relaxation to the α-relaxation and surface diffusion in ethylcyclohexane
description	According to the Coupling Model (CM), secondary relaxation belonging to a special class has strong connection to the α-relaxation. These Johari-Goldstein (JG) β-relaxations are predicted to be ubiquitous, and its relaxation time is approximately equal to the primitive relaxation time and the surface diffusion time. These predictions cannot be tested directly in ethylcyclohexane (ECH) because the JG β-relaxation is unresolved and overlapping the α-relaxation to modify its dispersion. To capture the actual dispersion of the α-relaxation we considered surface diffusion data, adiabatic calorimetry data of the JG β-relaxation, and dielectric data of cyanocyclohexane (CNCH). We demonstrated the dispersion of the α-relaxation is actually narrower than known before. The primitive relaxation times calculated are now in agreement with τJG(T) and with τsurface(T), and in accord with the CM predictions.
format	article
author	K.L. Ngai S. Capaccioli
author_facet	K.L. Ngai S. Capaccioli
author_sort	K.L. Ngai
title	Reconsidering the relation of the JG β-relaxation to the α-relaxation and surface diffusion in ethylcyclohexane
title_short	Reconsidering the relation of the JG β-relaxation to the α-relaxation and surface diffusion in ethylcyclohexane
title_full	Reconsidering the relation of the JG β-relaxation to the α-relaxation and surface diffusion in ethylcyclohexane
title_fullStr	Reconsidering the relation of the JG β-relaxation to the α-relaxation and surface diffusion in ethylcyclohexane
title_full_unstemmed	Reconsidering the relation of the JG β-relaxation to the α-relaxation and surface diffusion in ethylcyclohexane
title_sort	reconsidering the relation of the jg β-relaxation to the α-relaxation and surface diffusion in ethylcyclohexane
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/6f41843afe6340fb987371dc56269539
work_keys_str_mv	AT klngai reconsideringtherelationofthejgbrelaxationtothearelaxationandsurfacediffusioninethylcyclohexane AT scapaccioli reconsideringtherelationofthejgbrelaxationtothearelaxationandsurfacediffusioninethylcyclohexane
_version_	1718419546457505792

Reconsidering the relation of the JG β-relaxation to the α-relaxation and surface diffusion in ethylcyclohexane

Ejemplares similares