Facile preparation of size-controlled mesoporous silica particles by metal-chelating surfactant micelle complexes
| Autor: | Jeong Ho Chang, Seojun Jang, Hye Sun Lee, Jin Won Kim |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Aqueous solution Mechanical Engineering Metal ions in aqueous solution Inorganic chemistry 02 engineering and technology Mesoporous silica 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Micelle 0104 chemical sciences Metal Transition metal Pulmonary surfactant Mechanics of Materials visual_art visual_art.visual_art_medium General Materials Science Qualitative inorganic analysis 0210 nano-technology |
| Zdroj: | Materials Letters. 173:50-54 |
| ISSN: | 0167-577X |
| DOI: | 10.1016/j.matlet.2016.02.156 |
| Popis: | The size-controlling of mesoporous silica particles (MSPs) are achieved by various metal-chelating surfactant micelle complexes using alkali (Na + , K + , and Cs + ), alkaline earth (Mg 2+ , Ca 2+ , Sr 2+ , and Ba 2+ ), and transition metal ions (Co 2+ , Ni 2+ , Cu 2+ , and Zn 2+ ), respectively. These metal ions form a metal-surfactant micelle complex in an aqueous solution, while the metal ions are chelated to the hydrophilic domain of the surfactant such as the poly(ethylene oxide) group of a P123 surfactant. The differences in the complexation degree between the metal ions and surfactant plays an important role in determining the formation of nano-sized ordered MSPs due to the different stability constant for metal-P123 surfactant complexation. The complete hydrolysis of a silica precursor under an acidic condition and the subsequent steady assembly of negative silicate species and positive metal ions can effectively improve highly ordered MSPs. Consequently, the particle size can be reduced from a particle length of 1700 nm to a range of 250–800 nm with the transition metal ions. |
| Databáze: | OpenAIRE |
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