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Phase behavior of charged colloids at a fluid interface | Colm P. Kelleher
; Rodrigo E. Guerra
; Andrew D. Hollingsworth
; Paul M. Chaikin
; | Date: |
30 Jan 2017 | Abstract: | We study the phase behavior of a system of charged colloidal particles that
are electrostatically bound to an almost flat interface between two fluids. We
show that, despite the fact that our experimental system consists of only
$10^{3}$ - $10^{4}$ particles, the phase behavior is consistent with the theory
of melting due to Kosterlitz, Thouless, Halperin, Nelson and Young (KTHNY).
Using spatial and temporal correlations of the bond-orientational order
parameter, we classify our samples into solid, isotropic fluid, and hexatic
phases. We demonstrate that the topological defect structure we observe in each
phase corresponds to the predictions of KTHNY theory. By measuring the dynamic
Lindemann parameter, $gamma_{L}( au)$, and the non-Gaussian parameter,
$alpha_{2}( au)$, of the displacements of the particles relative to their
neighbors, we show that each of the phases displays distinctive dynamical
behavior. | Source: | arXiv, 1701.8727 | Services: | Forum | Review | PDF | Favorites |
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