Issue 37, 2013

Self-assembly of spherical colloidal particles with off-centered magnetic dipoles

Abstract

Fluids of spherical colloids possessing an off-centered embedded magnetic dipole were investigated by using Monte Carlo simulations. Systems of colloids with different strengths and directions of the embedded dipole moment confined in a 2D space without and with an external magnetic field applied were considered. The fluids were characterized by radial distribution functions, angular distribution functions, cluster data, and energetic data. In the absence of an external field, the colloids form dimers and trimers at sufficiently large magnetic moment without the tendency of forming chains of colloids as appearing in systems with particles possessing a central magnetic dipole. In the presence of an external field, chains of colloids aligned in a zigzag fashion were formed for a field parallel to the plane of the particles, whereas the colloidal ordering was suppressed in the presence of a field perpendicular to that plane. The findings agree surprisingly well with the recent experimental observations on fluids containing spherical polymer colloids with embedded single-domain magnetic hematite cubes (S. Sacanna, L. Rossi, and D. J. Pine, J. Am. Chem. Soc., 2012, 134, 6112).

Graphical abstract: Self-assembly of spherical colloidal particles with off-centered magnetic dipoles

Article information

Article type
Paper
Submitted
14 Sep 2012
Accepted
18 Jul 2013
First published
19 Jul 2013

Soft Matter, 2013,9, 8904-8913

Self-assembly of spherical colloidal particles with off-centered magnetic dipoles

A. I. Abrikosov, S. Sacanna, A. P. Philipse and P. Linse, Soft Matter, 2013, 9, 8904 DOI: 10.1039/C3SM27128E

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