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Melting of Colloidal Crystal Films

Authors Peng, Yi
Wang, Ziren
Alsayed, A.M.
Yodh, A.G.
Han, Yilong
Issue Date 2010
Source Physical review letters, v. 104, (20), May 2010
Summary We study melting mechanisms in single and polycrystalline colloidal films composed of diameter-tunable microgel spheres with short-ranged repulsive interactions and confined between two glass walls. Thick films ( > 4 layers), thin-films ( ≤ 4 layers), and monolayers exhibit different melting behaviors. Thick films melt from grain boundaries in polycrystalline solid films and from film-wall interfaces in single-crystal films; a liquid-solid coexistence regime is observed in thick films but vanishes at a critical thickness of 4 layers. Thin solid films (2 to 4 layers) melt into the liquid phase in one step from both grain boundaries and from within crystalline domains. Monolayers melt in two steps with a middle hexatic phase.
ISSN 0031-9007
Rights © 2010 The American Physical Society
Language English
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