Elastic and Dynamic Heterogeneity in Aging Alginate Gels

Anomalous aging in soft glassy materials has generated a great deal of interest because of some intriguing features of the underlying relaxation process, including the emergence of “ultra-long-range” dynamical correlations. An intriguing possibility is that such a huge correlation length is reflecte...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Raffaele Pastore, Ciro Siviello, Domenico Larobina
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	physical gels alginate elastic heterogeneity dynamic heterogeneity Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/5d0beece7f444e2081b667d231f88b85
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:5d0beece7f444e2081b667d231f88b85
record_format	dspace
spelling	oai:doaj.org-article:5d0beece7f444e2081b667d231f88b852021-11-11T18:41:34ZElastic and Dynamic Heterogeneity in Aging Alginate Gels10.3390/polym132136182073-4360https://doaj.org/article/5d0beece7f444e2081b667d231f88b852021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4360/13/21/3618https://doaj.org/toc/2073-4360Anomalous aging in soft glassy materials has generated a great deal of interest because of some intriguing features of the underlying relaxation process, including the emergence of “ultra-long-range” dynamical correlations. An intriguing possibility is that such a huge correlation length is reflected in detectable ensemble fluctuations of the macroscopic material properties. We tackle this issue by performing replicated mechanical and dynamic light scattering (DLS) experiments on alginate gels, which recently emerged as a good model-system of anomalous aging. Here we show that some of the monitored quantities display wide variability, including large fluctuations in the stress relaxation and the occasional presence of two-step decay in the DLS decorrelation functions. By quantifying elastic fluctuation through the standard deviation of the elastic modulus and dynamic heterogeneities through the dynamic susceptibility, we find that both quantities do increase with the gel age over a comparable range. Our results suggest that large elastic fluctuations are closely related to ultra-long-range dynamical correlation, and therefore may be a general feature of anomalous aging in gels.Raffaele PastoreCiro SivielloDomenico LarobinaMDPI AGarticlephysical gelsalginateelastic heterogeneitydynamic heterogeneityOrganic chemistryQD241-441ENPolymers, Vol 13, Iss 3618, p 3618 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	physical gels alginate elastic heterogeneity dynamic heterogeneity Organic chemistry QD241-441
spellingShingle	physical gels alginate elastic heterogeneity dynamic heterogeneity Organic chemistry QD241-441 Raffaele Pastore Ciro Siviello Domenico Larobina Elastic and Dynamic Heterogeneity in Aging Alginate Gels
description	Anomalous aging in soft glassy materials has generated a great deal of interest because of some intriguing features of the underlying relaxation process, including the emergence of “ultra-long-range” dynamical correlations. An intriguing possibility is that such a huge correlation length is reflected in detectable ensemble fluctuations of the macroscopic material properties. We tackle this issue by performing replicated mechanical and dynamic light scattering (DLS) experiments on alginate gels, which recently emerged as a good model-system of anomalous aging. Here we show that some of the monitored quantities display wide variability, including large fluctuations in the stress relaxation and the occasional presence of two-step decay in the DLS decorrelation functions. By quantifying elastic fluctuation through the standard deviation of the elastic modulus and dynamic heterogeneities through the dynamic susceptibility, we find that both quantities do increase with the gel age over a comparable range. Our results suggest that large elastic fluctuations are closely related to ultra-long-range dynamical correlation, and therefore may be a general feature of anomalous aging in gels.
format	article
author	Raffaele Pastore Ciro Siviello Domenico Larobina
author_facet	Raffaele Pastore Ciro Siviello Domenico Larobina
author_sort	Raffaele Pastore
title	Elastic and Dynamic Heterogeneity in Aging Alginate Gels
title_short	Elastic and Dynamic Heterogeneity in Aging Alginate Gels
title_full	Elastic and Dynamic Heterogeneity in Aging Alginate Gels
title_fullStr	Elastic and Dynamic Heterogeneity in Aging Alginate Gels
title_full_unstemmed	Elastic and Dynamic Heterogeneity in Aging Alginate Gels
title_sort	elastic and dynamic heterogeneity in aging alginate gels
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/5d0beece7f444e2081b667d231f88b85
work_keys_str_mv	AT raffaelepastore elasticanddynamicheterogeneityinagingalginategels AT cirosiviello elasticanddynamicheterogeneityinagingalginategels AT domenicolarobina elasticanddynamicheterogeneityinagingalginategels
_version_	1718431763850592256

Elastic and Dynamic Heterogeneity in Aging Alginate Gels

Ejemplares similares