L Assoud et al 2009 J. Phys.: Condens. Matter 21 464114 doi:10.1088/0953-8984/21/46/464114
L Assoud1, F Ebert2, P Keim2, R Messina1, G Maret2 and H Löwen1
Show affiliationsWe examine binary mixtures of superparamagnetic colloidal particles confined to a two-dimensional water–air interface both by real-space experiments and Monte Carlo computer simulations at high coupling strength. In the simulations, the interaction is modelled as a pairwise dipole–dipole repulsion. While the ratio of magnetic dipole moments is fixed, the interaction strength governed by the external magnetic field and the relative composition is varied. Excellent agreement between simulation and experiment is found for the partial pair distribution functions including the fine structure of the neighbour shells at high coupling. Furthermore local crystal nuclei in the melt are identified by bond-orientational order parameters and their contribution to the pair structure is discussed.
68.03.Hj Liquid surface structure: measurements and simulations
61.20.Ja Computer simulation of liquid structure
75.30.Cr Saturation moments and magnetic susceptibilities
75.20.-g Diamagnetism, paramagnetism, and superparamagnetism
Soft matter, liquids and polymers
Condensed matter: electrical, magnetic and optical
Issue 46 (18 November 2009)
Received 4 May 2009
Published 27 October 2009
L Assoud et al 2009 J. Phys.: Condens. Matter 21 464114
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