Self-Assembly of a Hexagonal Phase of Wormlike Micelles Containing Metal Nanoclusters
| Autor: | Mehul B. Thathagar, Erika Eiser, Gadi Rothenberg, Fatima Bouchama, Daan H. Turkenburg |
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| Přispěvatelé: | HIMS (FNWI), Molecular Inorganic Chemistry (HIMS, FNWI) |
| Rok vydání: | 2004 |
| Předmět: |
Materials science
genetic structures Hexagonal phase Surfaces and Interfaces Crystal structure Condensed Matter Physics law.invention Nanoclusters Condensed Matter::Soft Condensed Matter Crystal Metal Crystallography Optical microscope law Phase (matter) visual_art Electrochemistry visual_art.visual_art_medium General Materials Science Spectroscopy Phase diagram |
| Zdroj: | Langmuir, 20(2), 477-483. American Chemical Society |
| ISSN: | 1520-5827 0743-7463 |
| Popis: | Stable nanoclusters (approximately 2 nm in diameter) of copper, silver, gold, palladium, and ruthenium coated with hydrophobic coronas are easily trapped in self-assembled "soft crystal" hexagonal phase gels made of water and surfactants. The system's crystal structure and phase behavior are studied in detail. A partial phase diagram showing the hexagonal phase region for the water/SDS/toluene region is presented. High-energy X-ray scattering and cross-polarized optical microscopy experiments show that the clusters are tightly confined within the tubes. The thermal gel-fluid transitions of the hexagonal phase are investigated, and it is shown that the hexagonal phase can melt and recrystallize repeatedly. The melt/gel cycles enable easy trapping of various metal clusters in pre-prepared hexagonal phases. In contrast to spherical micelles, the hexagonal phase doped with metal clusters can grow without limit, basically up to the container walls (Ru-doped soft crystals grew to 0.5 mm over 2 months, forming wormlike tubes that are more than 50 microm long but only 7-10 nm in diameter). |
| Databáze: | OpenAIRE |
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