期刊
CHEMISTRY OF MATERIALS
卷 27, 期 15, 页码 5161-5169出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.5b01772
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资金
- Flemish government (Methusalem) [METH/08/04]
- Belgian government (IAP-PAI) [P7/05 FS2]
- European Research Council (ERC) [335078-COLOURATOMS]
- Flemish FWO [1265013N]
A new ordered mesoporous silica material (COK-19) with cubic symmetry is synthesized by silicate polycondensation in a citric acid/citrate buffered micellar solution of Pluronic F127 triblock copolymer near neutral pH. SAXS, nitrogen adsorption, TEM, and electron tomography reveal the final material has a cubic close packed symmetry (Fm (3) over barm) with isolated spherical mesopores interconnected through micropores. Heating of the synthesis medium from room temperature to 70 degrees C results in a mesopore size increase from 7.0 to 11.2 nm. Stepwise addition of the silicate source allows isolation of a sequence of intermediates that upon characterization with small-angle X-ray scattering uncovers the formation process via formation and aggregation of individual silica-covered Pluronic micelles.
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