Abstract
A two-dimensional colloidal suspension subject to a periodic substrate evolves into a colloidal molecular crystal under situations of strong confinement. We focus on the long-range orientational order thereby emerging, in the ground state. We study by simulations the situations where in each trap lies a pair of identical colloids, or alternatively a pair of oppositely charged macroions. We consider square or triangular geometries for the periodic confinement, together with less symmetric distorted lattices.
Highlights
AND BACKGROUNDWhereas Coulombic interactions are recognized as essential to the understanding of the phase and structural properties of colloidal suspensions in the broad sense, there has been comparatively little work devoted to the behaviour of charged composite objects in a solution
We focus on the long range orientational order thereby emerging, in the ground state
This expression is of the same order in r as Eq (1), and more generally, all multipoles contribute to the leading term in the large distance decay of the electric potential for an arbitrary charge distribution (Trizac et al 2002, Agra et al 2004a, Ramirez and Kjellander 2006)
Summary
AND BACKGROUNDWhereas Coulombic interactions are recognized as essential to the understanding of the phase and structural properties of colloidal suspensions in the broad sense, there has been comparatively little work devoted to the behaviour of charged composite objects in a solution. We consider square or triangular geometries for the periodic confinement, together with less symmetric distorted lattices. We consider the case of a rectangular lattice of confining traps in a strong pinning regime where there are exactly two colloids per trap, thereby forming a dimer.
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