Formation of mesoporous silica particles with hierarchical morphology

Ijaz, Aatif and Yağcı, M. Barış and Ow-Yang, Cleva W. and Demirel, A. Levent and Miko, Annamaria (2020) Formation of mesoporous silica particles with hierarchical morphology. Microporous and Mesoporous Materials, 303 . ISSN 1387-1811 (Print) 1873-3093 (Online)

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Abstract

The transformation of mesoporous silica morphology from monoliths to spherical particles was investigated at room temperature in Pluronic F127/TEOS system as a function of HCl acid catalyst concentration to understand and control the mechanism. It is shown that the specific surface area and the size of mesoporous spherical silica particles can simply be adjusted by the catalyst concentration without using any additives or post-treatment. Above 3 M acid concentration, novel monodisperse micron sized spherical silica with hierarchical order of two levels was obtained. These silica spheres were formed of densely packed distorted hexagonal platelets of 20-30 nm in diameter. Within these platelets mesoporous channels were oriented along a single direction, however the platelets were randomly oriented in the spherical particles. Controlling the agglomeration of mesoporous silica primary particles by the concentration of the acid catalyst to obtain micron-sized spherical particles is novel. This approach allows the synthesis of particles whose sizes can be controlled in the range of similar to 1-4 mu m and specific surface area in the range of similar to 200-500 m(2)/g. The morphology of the particles transforms from spherical shape to mesoporous monoliths at acid concentrations below 1 M due to slow hydrolysis and condensation. These results are important in understanding the role of catalyst concentration on the formation mechanism of different morphologies of mesoporous silica.
Item Type: Article
Uncontrolled Keywords: Mesoporous silica; Hierarchical morphology; Non-ionic surfactant template; Room temperature synthesis; Acid catalyst
Subjects: Q Science > Q Science (General)
Divisions: Faculty of Engineering and Natural Sciences > Academic programs > Materials Science & Eng.
Sabancı University Nanotechnology Research and Application Center
Faculty of Engineering and Natural Sciences
Depositing User: Cleva W. Ow-Yang
Date Deposited: 20 Sep 2020 12:14
Last Modified: 20 Sep 2020 12:14
URI: https://research.sabanciuniv.edu/id/eprint/40427

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