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Water-Induced Phase Separation forming Macrostructured Epitaxial Quartz Films on Silicon

Water-Induced Phase Separation forming Macrostructured Epitaxial Quartz Films on Silicon

Glenna L. Drisko, Adrian Carretero-Genevrier,* Martí Gich, Jaume Gàzquez, Djawhar Ferrah, David Grosso, Cédric Boissière, Juan Rodriguez-Carvajal, and Clément Sanchez*.  Adv. Funct. Mater.

Dynamics of the Field-Induced Formation of Hexagonal Zipped-Chain Superstructures in Magnetic Colloids

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27-05-2011_12-38-39

D. Heinrich, A. R. Goñi, A. Smessaert, S. H. L. Klapp, L. M. C. Cerioni, T. M. Osán, D. J. Pusiol, and C. Thomsen

PRL 106, 208301 (2011)

DOI:10.1103/PhysRevLett.106.208301
PACS:82.70.Dd, 68.08.De, 75.50.Mm, 76.60.-k

Combining nuclear magnetic resonance and molecular dynamics simulations, we unravel the long-time dynamics of a paradigmatic colloid with strong dipole-dipole interactions. In a homogeneous magnetic field, ionic ferrofluids exhibit a stepwise association process from ensembles of monomers over stringlike chains to bundles of hexagonal zipped-chain patches. We demonstrate that attractive van der Waals interactions due to charge-density fluctuations in the magnetic particles play the key role for the dynamical stabilization of the hexagonal superstructures against thermal dissociation. Our results give insight into the dynamics of self-organization in systems dominated by dipolar interactions.

 

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