Effect of crystallization rate and colloidal stability on structural rearrangements during growth of colloidal monolayers
| Autor: | Sandra Rödner, Lennart Bergström |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Chemistry
Stereochemistry Crystal structure Substrate (electronics) Colloidal crystal Square lattice Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Condensed Matter::Soft Condensed Matter Biomaterials Reaction rate Colloid Colloid and Surface Chemistry Chemical physics law Monolayer Crystallization |
| Zdroj: | Journal of Colloid and Interface Science. 265:29-35 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/s0021-9797(03)00370-9 |
| Popis: | The structural rearrangements during growth of colloidal crystals were investigated using a combination of light microscopy and image analysis based on a Delaunay triangulation procedure. We followed the creation and disappearance of square lattice domains during the convection-promoted formation of colloidal monolayers by drying. We found that the concentration of square lattice domains increased with the crystal growth rate and that there is a direct relation between the concentration of square lattice domains formed at the crystal-suspension interface and the lower concentration of these domains in the colloidal monolayer; hence, the degree of rearrangement from square lattice domains to a close-packed triangular structure is not significantly affected by the crystal growth rate for colloidally stable suspensions. The colloidal stability, manipulated by the addition of salt, has a profound influence on the structural features of the growing monolayers. Particles that adhere strongly to each other, and to the substrate, tend to resist rearrangement; hence, the defect density is high in the colloidal monolayers and the structural reorganization of the square lattice domains to the more stable close-packed triangular structure occurred gradually over large distances from the crystal-suspension interface. |
| Databáze: | OpenAIRE |
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