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Title
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Self-assembly of pluronic F127-silica spherical core-shell nanoparticles in cubic close-packed structures
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Author
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Abstract
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| 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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Language
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English
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Source (journal)
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Chemistry of materials / American Chemical Society. - Washington, D.C., 1989, currens
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Publication
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Washington, D.C.
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2015
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ISSN
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0897-4756
[print]
1520-5002
[online]
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DOI
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10.1021/ACS.CHEMMATER.5B01772
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Volume/pages
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27
:15
(2015)
, p. 5161-5169
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ISI
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000359499100003
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Full text (Publisher's DOI)
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Full text (open access)
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