Synthesis of nanostructured γ-alumina with a cationic surfactant and controlled amounts of water
| Autor: | Hae Jin Kim, Kyung Hee Lee, Hyun Chul Lee, Chang Houn Rhee, Jae Sung Lee, Soo Hyun Chung |
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| Rok vydání: | 2005 |
| Předmět: |
Materials science
Chromatography Cationic polymerization General Chemistry Condensed Matter Physics Molecular sieve Hydrolysis chemistry.chemical_compound chemistry Chemical engineering Pulmonary surfactant Mechanics of Materials Alkoxide Hydrothermal synthesis General Materials Science Thermal stability Mesoporous material |
| Zdroj: | Microporous and Mesoporous Materials. 79:61-68 |
| ISSN: | 1387-1811 |
| DOI: | 10.1016/j.micromeso.2004.10.021 |
| Popis: | Nanostructured crystalline γ-alumina was synthesized by a simpler and improved method proposed here from aluminum alkoxide precursor in the presence of a cationic surfactant and controlled amounts of water under hydrothermal conditions without any extra additives such as hydrolysis controlling agents. The material synthesized with a stoichiometric amount of water (H 2 O/Al = 2) was a mesoporous molecular sieve with a ‘wormhole-like’ pore structure. With increasing amounts of water (H 2 O/Al = 10 or 20), bundles of γ-alumina nanofibers were formed, and with H 2 O/Al > 20, materials with no definite morphology were formed, probably due to too fast hydrolysis of the precursor. The nanostructured materials had high surface areas and a good thermal stability. |
| Databáze: | OpenAIRE |
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