Crystal nuclei and structural correlations in two-dimensional colloidal 
mixtures: experiment versus simulation

Assoud, L; Ebert, F; Keim, P.; Messina, R; Maret, G; Löwen, H

doi:10.1088/0953-8984/21/46/464114

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Crystal nuclei and structural correlations in two-dimensional colloidal mixtures: experiment versus simulation

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Keim, P.
Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

Assoud, L., Ebert, F., Keim, P., Messina, R., Maret, G., & Löwen, H. (2009). Crystal nuclei and structural correlations in two-dimensional colloidal mixtures: experiment versus simulation. Journal of Physics: Condensed Matter, 21: 464114. doi:10.1088/0953-8984/21/46/464114.

Cite as: https://hdl.handle.net/21.11116/0000-0009-87FC-3

Abstract

We 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.