TY  - JOUR
AU  - Gupta, Sudipta
AU  - Stellbrink, Jörg
AU  - Zaccarelli, Emanuela
AU  - Likos, Christos N.
AU  - Camargo, Manuel
AU  - Holmqvist, Peter
AU  - Allgaier, J.
AU  - Willner, Lutz
AU  - Richter, Dieter
TI  - Validity of the Stokes-Einstein Relation in Soft Colloids up to the Glass Transition
JO  - Physical review letters
VL  - 115
IS  - 12
SN  - 1079-7114
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2015-05770
SP  - 128302
PY  - 2015
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000361316500017
C6  - pmid:26431020
DO  - DOI:10.1103/PhysRevLett.115.128302
UR  - https://juser.fz-juelich.de/record/255635
ER  -