| Autor: |
Bo-Jiun Lin, Li-Jen Chen |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 1/21/2007, Vol. 126 Issue 3, p034706, 8p, 1 Color Photograph, 1 Diagram, 5 Graphs |
| Abstrakt: |
Enhanced digital video microscopy is applied to study the equilibrium structure of a two-dimensional charged sulfate-polystyrene particle (2 μm in diameter) monolayer at decane/water interfaces. When the surface density is decreased, a sequential phase transition, pure solid phase→pure hexatic phase→liquid-hexatic-coexisting phase→pure liquid phase, is observed. In addition, the transition between liquid and hexatic phases is first order, while the solid-hexatic phase transition is second order. The temperature effect on this two-dimensional melting transition is discussed by performing the experiments at three different temperatures. The Voronoi [J. Reine Angew. Math. 134, 198 (1908)] construction is applied to analyze the defect structure in the two-dimensional particle monolayer. The pair interaction potential of the two-dimensional colloidal particles is found to be a very long range repulsion and to decay with distance to the power of -3. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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