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Premelting at Defects Within Bulk Colloidal Crystals
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Premelting at Defects Within Bulk Colloidal Crystals
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Premelting at Defects Within Bulk Colloidal Crystals
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Journal Article
Premelting at Defects Within Bulk Colloidal Crystals
2005
Overview
Premelting is the localized loss of crystalline order at surfaces and defects at temperatures below the bulk melting transition. It can be thought of as the nucleation of the melting process. Premelting has been observed at the surfaces of crystals but not within. We report observations of premelting at grain boundaries and dislocations within bulk colloidal crystals using real-time video microscopy. The crystals are equilibrium close-packed, three-dimensional colloidal structures made from thermally responsive microgel spheres. Particle tracking reveals increased disorder in crystalline regions bordering defects, the amount of which depends on the type of defect, distance from the defect, and particle volume fraction. Our observations suggest that interfacial free energy is the crucial parameter for premelting in colloidal and atomic-scale crystals.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science
Subject
/ Climate
/ Colloidal state and disperse state
/ Colloids
/ Condensed matter: structure, mechanical and thermal properties
/ Crystals
/ Energy
/ Equations of state, phase equilibria, and phase transitions
/ Exact sciences and technology
/ General and physical chemistry
/ Melting
/ Physical and chemical studies. Granulometry. Electrokinetic phenomena
/ Physicochemistry of polymers
/ Physics
/ Properties and characterization
/ Structure, morphology and analysis
/ Water
