Title
Self-assembly of pluronic F127-silica spherical core-shell nanoparticles in cubic close-packed structures Self-assembly of pluronic F127-silica spherical core-shell nanoparticles in cubic close-packed structures
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Subject
Physics
Chemistry
Source (journal)
Chemistry of materials
Volume/pages
27(2015) :15 , p. 5161-5169
ISSN
0897-4756
ISI
000359499100003
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
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 (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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Full text (open access)
https://repository.uantwerpen.be/docman/irua/12f631/127758.pdf
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