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

被引：45

作者：

Kerkhofs, Stef ^{[1
]}

Willhammar, Tom ^{[2
]}

Van Den Noortgate, Heleen ^{[1
]}

Kirschhock, Christine E. A. ^{[1
]}

Breynaert, Eric ^{[1
]}

Van Tendeloo, Gustaaf ^{[2
]}

Bals, Sara ^{[2
]}

Martens, Johan A. ^{[1
]}

机构：

[1] Katholieke Univ Leuven, Ctr Surface Chem & Catalysis, B-3001 Louvain, Belgium

[2] Univ Antwerp, Electron Microscopy Mat Sci EMAT, B-2020 Antwerp, Belgium

来源：

CHEMISTRY OF MATERIALS | 2015年 / 27卷 / 15期

基金：

欧洲研究理事会;

关键词：

ORDERED MESOPOROUS SILICA; AQUEOUS-SOLUTIONS; TRIBLOCK COPOLYMERS; NEUTRON-SCATTERING; ZEOLITE SYNTHESIS; SBA-15; MATERIALS; MECHANISM; CRYSTAL; PORES; THERMODYNAMICS;

D O I：

10.1021/acs.chemmater.5b01772

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：5161 / 5169

页数：9

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