Transformation of Mesostructured Silica Nanoparticles into Colloidal Hollow Nanoparticles in the Presence of a Bridged-Organosiloxane Shell
| Autor: | Atsushi Shimojima, Kazuyuki Kuroda, Eisuke Yamamoto, Hiroaki Wada, Saki Uchida |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Morphology (linguistics)
Materials science General Chemical Engineering Shell (structure) Nanoparticle Core (manufacturing) 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Colloid Chemical state chemistry Chemical engineering Siloxane Materials Chemistry 0210 nano-technology Dissolution |
| Zdroj: | Chemistry of Materials. 30:540-548 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/acs.chemmater.7b04860 |
| Popis: | Hollow siloxane-based nanoparticles (HSNs) have attracted significant attention because of their unique properties and applications. Recently, it was discovered that the simple covering of silica nanoparticles with an organosiloxane shell leads to the spontaneous formation of HSNs; however, the detailed mechanism of their formation has not yet been established. In this study, colloidal 30-nm HSNs were prepared by adding organically bridged alkoxysilane to an aqueous dispersion of mesostructured silica-surfactant composite nanoparticles, and the temporal changes of the morphology and chemical state of the nanoparticles were monitored to elucidate the formation mechanism. Core silica was dissolved after the formation of the core-shell structured nanoparticles, and almost all the dissolved silicate species were incorporated in the organosiloxane shell, changing the shell thickness. Two conditions were essential for silica dissolution induced by covering with organosiloxane: i) presence of a sufficient amount... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|