Thermal expansion within a chain of magnetic colloidal particles

D. Lacoste, C. Brangbour, J. Bibette, and J. Baudry

Phys. Rev. E 80, 011401 – Published 1 July 2009

Abstract

We study the thermal expansion of chains formed by self-assembly of magnetic colloidal particles in a magnetic field. Using video microscopy, complete positional data of all the particles of the chains is obtained. By changing the ionic strength of the solution and the applied magnetic field, the interaction potential can be tuned. We analyze the thermal expansion of the chain using a simple model of a one-dimensional anharmonic crystal of finite size.

Received 18 December 2008

DOI:https://doi.org/10.1103/PhysRevE.80.011401

Authors & Affiliations

D. Lacoste¹, C. Brangbour², J. Bibette², and J. Baudry²

¹Physico-Chimie Théorique, CNRS–ESPCI, UMR 7083, 10 rue Vauquelin, 75231 Paris Cedex 05, France
²Laboratoire de Colloïdes et matériaux divisés, ESPCI ParisTech, UPMC, CNRS UMR 7612, 10 rue Vauquelin, 75005 Paris, France

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Vol. 80, Iss. 1 — July 2009

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Physical Review E

covering statistical, nonlinear, biological, and soft matter physics