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Volumn 83, Issue 4, 2011, Pages

Colloidal ionic complexes on periodic substrates: Ground-state configurations and pattern switching

Author keywords

[No Author keywords available]

Indexed keywords

ELECTRICAL FIELD; IONIC CLUSTERS; IONIC COMPLEX; MACROSCOPIC PATTERN; OPTICALTRAPPING; PARAMETER RANGE; PATTERN SWITCHING; PERCOLATED STRUCTURES; POSITIVELY CHARGED; RECTANGULAR ARRAYS; SPHERICAL COLLOIDS; SUBSTRATE POTENTIAL;

EID: 79961054820     PISSN: 15393755     EISSN: 15502376     Source Type: Journal    
DOI: 10.1103/PhysRevE.83.041403     Document Type: Article
Times cited : (11)

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    • It is worth stressing that the ground states we consider here are reached at constant κ while the latter is a temperature-dependent quantity. Such a point of view-consistent with the numerical approach of -requires considering large pinning amplitudes (strong laser fields) at constant temperature and constant electrolyte density from an experimental perspective. However, compared to the like-charge colloidal cases studied previously, there is no need here to tune correlatively the colloidal charge, since within a composite molecule in a given trap, the colloids are in contact: in the like-charge case, the extension of the molecules depends critically on the confinement amplitude, whereas here, this amplitude only affects the shape of the molecules, but not their extension
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    • This mechanism somehow resembles the strain-induced colloidal clustering on periodic (triangular) substrates with more traps than colloids. Another somewhat related phenomenon is the appearance of the so-called cluster crystals in systems with soft repulsive potentials, although the present system is more complex and a delicate interplay between the external confinement and the colloidal interactions governs its behavior.
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    • See supplemental material at [http://link.aps.org/supplemental/10.1103/ PhysRevE.83.041403] for animated images showing various local minimum configurations.
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