Cluster Crystals under Shear

Autor(en)

Arash Nikoubashman, Gerhard Kahl, Christos Likos

Abstrakt

We show that a distinct class of colloidal crystals, which consist of mutually overlapping particles, has a novel and universal response to steady shear. After a shear-banding regime at low shear rates, strings parallel to the flow direction form as shear grows, which order on a hexagonal crystal in the gradient-vorticity plane. At even higher shear, lateral fluctuations of the strings, enhanced by hydrodynamics, lead to a disordered, fluid state. Our results are based on appropriate simulation techniques that correctly account for hydrodynamics. We also find that shear vastly accelerates the nucleation rates of supercooled fluids into the cluster crystals.

Organisation(en)

Computergestützte Physik und Physik der Weichen Materie

Externe Organisation(en)

Technische Universität Wien

Journal

Physical Review Letters

Band

107

Anzahl der Seiten

5

ISSN

0031-9007

DOI

https://doi.org/10.1103/PhysRevLett.107.068302

Publikationsdatum

2011

Peer-reviewed

Ja

ÖFOS 2012

103023 Polymerphysik, 103036 Theoretische Physik, 103015 Kondensierte Materie, 103029 Statistische Physik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/0fdaaafb-7048-47cf-96a2-338133cdeb39