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IrOx–carbon nanotube hybrids: A nanostructured material for electrodes with increased charge capacity in neural systems

IrOx–carbon nanotube hybrids: A nanostructured material for electrodes with increased charge capacity in neural systems

Acta Biomaterialia, Volume 10, Issue 10, October 2014, Pages 4548–4558.     Nina M. Carretero, Mathieu P. Lichtenstein, Estela Pérez, Laura Cabana, Cristina Suñol, Nieves Casañ-Pastor

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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