Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.205703
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Funding
- NSF [DMR-0804881]
- MRSEC [DMR-0520020]
- NASA [NAG-2939]
- [RGC-601208]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0804881] Funding Source: National Science Foundation
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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.
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