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

Autor(en)

Sudipta Gupta, Joerg Stellbrink, Emanuela Zaccarelli, Christos N. Likos, Manuel Camargo, Peter Holmqvist, Jürgen Allgaier, Lutz Willner, Dieter Richter

Abstrakt

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.

Organisation(en)

Computergestützte Physik und Physik der Weichen Materie

Externe Organisation(en)

Oak Ridge National Laboratory , Forschungszentrum Jülich, Università degli Studi di Roma La Sapienza, Universidad Antonio Nariño, Lund University

Journal

Physical Review Letters

Band

115

Anzahl der Seiten

5

ISSN

0031-9007

DOI

https://doi.org/10.1103/PhysRevLett.115.128302

Publikationsdatum

09-2015

Peer-reviewed

Ja

ÖFOS 2012

103036 Theoretische Physik, 103015 Kondensierte Materie, 103029 Statistische Physik

Schlagwörter

ASJC Scopus Sachgebiete

Allgemeine Physik und Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/05508a9d-0db6-43dd-a360-e12a74293910