AI Article Synopsis
- A new ordered mesoporous silica material called COK-19 is created using a citric acid/citrate buffered solution and Pluronic F127 at nearly neutral pH.
- Characterization techniques like SAXS and nitrogen adsorption show that COK-19 has a unique cubic structure with isolated spherical mesopores connected by smaller micropores, and heating the synthesis solution increases mesopore size from 7.0 to 11.2 nm.
- The study also tracks the formation process of this material, highlighting how stepwise addition of silicate leads to the aggregation of silica-coated micelles.
Article Abstract
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 (3̅) with isolated spherical mesopores interconnected through micropores. Heating of the synthesis medium from room temperature to 70 °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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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4898863 | PMC |
| http://dx.doi.org/10.1021/acs.chemmater.5b01772 | DOI Listing |
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