Self-Assembly of Pluronic F127Silica Spherical Core–Shell Nanoparticles in Cubic Close-Packed Structures

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...

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Bibliographic Details
Published in:	Chemistry of materials Vol. 27; no. 15; pp. 5161 - 5169
Main Authors:	Kerkhofs, Stef, Willhammar, Tom, Van Den Noortgate, Heleen, Kirschhock, Christine E. A, Breynaert, Eric, Van Tendeloo, Gustaaf, Bals, Sara, Martens, Johan A
Format:	Journal Article
Language:	English
Published:	United States American Chemical Society 11.08.2015
ISSN:	0897-4756, 1520-5002
Online Access:	Get full text
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Summary:	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 (Fm3̅m) 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.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0897-4756 1520-5002
DOI:	10.1021/acs.chemmater.5b01772