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Validity of the Stokes-Einstein Relation in Soft Colloids up to the Glass Transition

Gupta, Sudipta; Stellbrink, Joerg; Zaccarelli, Emanuela; Likos, Christos N.; Camargo, Manuel; Holmqvist, Peter LU ; Allgaier, Juergen; Willner, Lutz and Richter, Dieter (2015) In Physical Review Letters 115(12).
Abstract
We investigate the dynamics of kinetically frozen block copolymer micelles of different softness across a wide range of particle concentrations, from the fluid to the onset of glassy behavior, through a combination of rheology, dynamic light scattering, and pulsed field gradient NMR spectroscopy. We additionally perform Brownian dynamics simulations based on an ultrasoft coarse- grained potential, which are found to be in quantitative agreement with experiments, capturing even the very details of dynamic structure factors S(Q, t) on approaching the glass transition. We provide evidence that for these systems the Stokes-Einstein relation holds up to the glass transition; given that it is violated for dense suspensions of hard colloids, our... (More)
We investigate the dynamics of kinetically frozen block copolymer micelles of different softness across a wide range of particle concentrations, from the fluid to the onset of glassy behavior, through a combination of rheology, dynamic light scattering, and pulsed field gradient NMR spectroscopy. We additionally perform Brownian dynamics simulations based on an ultrasoft coarse- grained potential, which are found to be in quantitative agreement with experiments, capturing even the very details of dynamic structure factors S(Q, t) on approaching the glass transition. We provide evidence that for these systems the Stokes-Einstein relation holds up to the glass transition; given that it is violated for dense suspensions of hard colloids, our findings suggest that its validity is an intriguing signature of ultrasoft interactions. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
115
issue
12
publisher
American Physical Society
external identifiers
  • wos:000361316500017
  • pmid:26431020
  • scopus:84942154729
ISSN
1079-7114
DOI
10.1103/PhysRevLett.115.128302
language
English
LU publication?
yes
id
f583a1fa-4c62-4d30-95bf-accc12b55bde (old id 8071179)
date added to LUP
2015-10-22 13:09:29
date last changed
2017-11-05 03:08:12
@article{f583a1fa-4c62-4d30-95bf-accc12b55bde,
  abstract     = {We investigate the dynamics of kinetically frozen block copolymer micelles of different softness across a wide range of particle concentrations, from the fluid to the onset of glassy behavior, through a combination of rheology, dynamic light scattering, and pulsed field gradient NMR spectroscopy. We additionally perform Brownian dynamics simulations based on an ultrasoft coarse- grained potential, which are found to be in quantitative agreement with experiments, capturing even the very details of dynamic structure factors S(Q, t) on approaching the glass transition. We provide evidence that for these systems the Stokes-Einstein relation holds up to the glass transition; given that it is violated for dense suspensions of hard colloids, our findings suggest that its validity is an intriguing signature of ultrasoft interactions.},
  articleno    = {128302},
  author       = {Gupta, Sudipta and Stellbrink, Joerg and Zaccarelli, Emanuela and Likos, Christos N. and Camargo, Manuel and Holmqvist, Peter and Allgaier, Juergen and Willner, Lutz and Richter, Dieter},
  issn         = {1079-7114},
  language     = {eng},
  number       = {12},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Validity of the Stokes-Einstein Relation in Soft Colloids up to the Glass Transition},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.115.128302},
  volume       = {115},
  year         = {2015},
}