Study of dynamical heterogeneities in colloidal nanoclay suspensions approaching dynamical arrest

Abstract The dynamics of aqueous Laponite clay suspensions slow down with increasing sample waiting time (t w ). This behavior, and the material fragility that results, closely resemble the dynamical slowdown in fragile supercooled liquids with decreasing temperature, and are typically ascribed to t...

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Autores principales:	Paramesh Gadige, Debasish Saha, Sanjay Kumar Behera, Ranjini Bandyopadhyay
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1c1a66fbd5944a3eae784bcd6a2901e8
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spelling	oai:doaj.org-article:1c1a66fbd5944a3eae784bcd6a2901e82021-12-02T15:05:35ZStudy of dynamical heterogeneities in colloidal nanoclay suspensions approaching dynamical arrest10.1038/s41598-017-08495-92045-2322https://doaj.org/article/1c1a66fbd5944a3eae784bcd6a2901e82017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08495-9https://doaj.org/toc/2045-2322Abstract The dynamics of aqueous Laponite clay suspensions slow down with increasing sample waiting time (t w ). This behavior, and the material fragility that results, closely resemble the dynamical slowdown in fragile supercooled liquids with decreasing temperature, and are typically ascribed to the increasing sizes of distinct dynamical heterogeneities in the sample. In this article, we characterize the dynamical heterogeneities in Laponite suspensions by invoking the three-point dynamic susceptibility formalism. The average time-dependent two-point intensity autocorrelation and its sensitivity to t w are probed in dynamic light scattering experiments. Distributions of relaxation time scales, deduced from the Kohlrausch-Williams-Watts equation, are seen to widen with increasing t w . The calculated three-point dynamic susceptibility of Laponite suspensions exhibits a peak, with the peak height increasing with evolving t w at fixed volume fraction or with increasing volume fraction at fixed t w , thereby signifying the slowdown of the sample dynamics. The number of dynamically correlated particles, calculated from the peak-height, is seen to initially increase rapidly with increasing t w , before eventually slowing down close to the non-ergodic transition point. This observation is in agreement with published reports on supercooled liquids and hard sphere colloidal suspensions and offers a unique insight into the colloidal glass transition of Laponite suspensions.Paramesh GadigeDebasish SahaSanjay Kumar BeheraRanjini BandyopadhyayNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Paramesh Gadige Debasish Saha Sanjay Kumar Behera Ranjini Bandyopadhyay Study of dynamical heterogeneities in colloidal nanoclay suspensions approaching dynamical arrest
description	Abstract The dynamics of aqueous Laponite clay suspensions slow down with increasing sample waiting time (t w ). This behavior, and the material fragility that results, closely resemble the dynamical slowdown in fragile supercooled liquids with decreasing temperature, and are typically ascribed to the increasing sizes of distinct dynamical heterogeneities in the sample. In this article, we characterize the dynamical heterogeneities in Laponite suspensions by invoking the three-point dynamic susceptibility formalism. The average time-dependent two-point intensity autocorrelation and its sensitivity to t w are probed in dynamic light scattering experiments. Distributions of relaxation time scales, deduced from the Kohlrausch-Williams-Watts equation, are seen to widen with increasing t w . The calculated three-point dynamic susceptibility of Laponite suspensions exhibits a peak, with the peak height increasing with evolving t w at fixed volume fraction or with increasing volume fraction at fixed t w , thereby signifying the slowdown of the sample dynamics. The number of dynamically correlated particles, calculated from the peak-height, is seen to initially increase rapidly with increasing t w , before eventually slowing down close to the non-ergodic transition point. This observation is in agreement with published reports on supercooled liquids and hard sphere colloidal suspensions and offers a unique insight into the colloidal glass transition of Laponite suspensions.
format	article
author	Paramesh Gadige Debasish Saha Sanjay Kumar Behera Ranjini Bandyopadhyay
author_facet	Paramesh Gadige Debasish Saha Sanjay Kumar Behera Ranjini Bandyopadhyay
author_sort	Paramesh Gadige
title	Study of dynamical heterogeneities in colloidal nanoclay suspensions approaching dynamical arrest
title_short	Study of dynamical heterogeneities in colloidal nanoclay suspensions approaching dynamical arrest
title_full	Study of dynamical heterogeneities in colloidal nanoclay suspensions approaching dynamical arrest
title_fullStr	Study of dynamical heterogeneities in colloidal nanoclay suspensions approaching dynamical arrest
title_full_unstemmed	Study of dynamical heterogeneities in colloidal nanoclay suspensions approaching dynamical arrest
title_sort	study of dynamical heterogeneities in colloidal nanoclay suspensions approaching dynamical arrest
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/1c1a66fbd5944a3eae784bcd6a2901e8
work_keys_str_mv	AT parameshgadige studyofdynamicalheterogeneitiesincolloidalnanoclaysuspensionsapproachingdynamicalarrest AT debasishsaha studyofdynamicalheterogeneitiesincolloidalnanoclaysuspensionsapproachingdynamicalarrest AT sanjaykumarbehera studyofdynamicalheterogeneitiesincolloidalnanoclaysuspensionsapproachingdynamicalarrest AT ranjinibandyopadhyay studyofdynamicalheterogeneitiesincolloidalnanoclaysuspensionsapproachingdynamicalarrest
_version_	1718388751892217856

Study of dynamical heterogeneities in colloidal nanoclay suspensions approaching dynamical arrest

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