Interfacial charge shielding directs the synthesis of dendritic mesoporous silica nanospheres by a dual-templating approach
| Autor: | Nie Mengzhen, Bo Peng, Shi-Yu Ma, Yu-Xin Zong, Koon Fung Lam, Tai-Qun Yang, Kun Zhang, Pan Hao, Bing-Qian Shan |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Silicon
Cyclohexene Cationic polymerization chemistry.chemical_element 02 engineering and technology General Chemistry Mesoporous silica 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Micelle Catalysis 0104 chemical sciences chemistry.chemical_compound Chemical engineering chemistry Materials Chemistry Reactivity (chemistry) 0210 nano-technology Mesoporous material Titanium |
| Zdroj: | New Journal of Chemistry. 43:15777-15784 |
| ISSN: | 1369-9261 1144-0546 |
| Popis: | We demonstrated a facile, dual-template method to synthesize uniform sized dendritic mesoporous silica nanospheres (DMSNs) with a large pore size via an interfacial charge shielding (ICS) approach, wherein the electrostatic interaction between the cationic surfactant micelle (S+) and the negative silicate species (I−) was precisely tuned by the deliberate use of a non-ionic co-surfactant with a varied chemical structure and number of ethyl oxide (EO) units. A universal ICS mechanism on the cationic spherical micelle surface by precisely tuning the {S+I−} interaction was proposed to explain the formation of conventional mesoporous silica nanospheres (MSNs) and DMSNs. Impressively, by precisely matching the hydrolysis and condensation rate of silicon and titanium sources, we successfully achieved the synthesis of titanium containing dendritic mesoporous silica nanospheres (Ti-DMSNs) with highly dispersed tetrahedral coordinated Ti atoms in silica frameworks, and it demonstrated a superior catalytic reactivity in the epoxidation of cyclohexene over the classical TS-1 and Ti-MCM-41. The elucidation of the formation mechanism of MSNs provided a new insight in the diversity-oriented synthesis of mesoporous materials. |
| Databáze: | OpenAIRE |
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