Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/6403
Full metadata record
DC FieldValueLanguage
dc.contributor.authorSaha, Debasish-
dc.contributor.authorJoshi, Yogesh M.-
dc.contributor.authorBandyopadhyay, Ranjini-
dc.date.accessioned2016-09-26T10:16:08Z-
dc.date.available2016-09-26T10:16:08Z-
dc.date.issued2015-12-
dc.identifier.citationJournal of Chemical Physics, 2015, Vol.143, p 214901en_US
dc.identifier.issn0021-9606-
dc.identifier.issn1089-7690 (Online)-
dc.identifier.urihttp://hdl.handle.net/2289/6403-
dc.descriptionOpen Accessen_US
dc.description.abstractMicroscopic relaxation time scales are estimated from the autocorrelation functions obtained by dynamic light scattering experiments for Laponite suspensions with different concentrations (CL), added salt concentrations (CS), and temperatures (T). It has been shown in an earlier work [D. Saha, Y. M. Joshi, and R. Bandyopadhyay, Soft Matter 10, 3292 (2014)] that the evolutions of relaxation time scales of colloidal glasses can be compared with molecular glass formers by mapping the waiting time (tw) of the former with the inverse of thermodynamic temperature (1/T) of the latter. In this work, the fragility parameter D, which signifies the deviation from Arrhenius behavior, is obtained from fits to the time evolutions of the structural relaxation time scales. For the Laponite suspensions studied in this work, D is seen to be independent of CL and CS but is weakly dependent on T. Interestingly, the behavior of D corroborates the behavior of fragility in molecular glass formers with respect to equivalent variables. Furthermore, the stretching exponent β, which quantifies the width w of the spectrum of structural relaxation time scales, is seen to depend on tw. A hypothetical Kauzmann time tk, analogous to the Kauzmann temperature for molecular glasses, is defined as the time scale at which w diverges. Corresponding to the Vogel temperature defined for molecular glasses, a hypothetical Vogel time t∞α is also defined as the time at which the structural relaxation time diverges. Interestingly, a correlation is observed between tk and t∞α, which is remarkably similar to that known for fragile molecular glass formers. A coupling model that accounts for the tw-dependence of the stretching exponent is used to analyse and explain the observed correlation between tk and t∞α.en_US
dc.language.isoenen_US
dc.publisherAmerican Institute of Physicsen_US
dc.relation.urihttps://arxiv.org/abs/1506.02971en_US
dc.relation.urihttp://dx.doi.org/10.1063/1.4936625en_US
dc.rights2015 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physicsen_US
dc.titleKinetics of the glass transition of fragile soft colloidal suspensionsen_US
dc.typeArticleen_US
Appears in Collections:Research Papers (SCM)

Files in This Item:
File Description SizeFormat 
2015_JCP_143_214901.pdfOpen Access1.3 MBAdobe PDFView/Open


Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.