Effect of pH in hydrothermal treatment of as-synthesized MCM-41 on wetting stability of resulting materials in aqueous solution

Effect of pH in aqueous media used in the hydrothermal treatment of as-synthesized MCM-41 on the structure and the wetting stability of the resulting materials was studied using XRD, TG-DTA and N 2 adsorption. The long-range structural order and the wetting stability of the mesoporous MCM-41 were im...

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Bibliographic Details
Published in:Journal of porous materials 2009-08, Vol.16 (4), p.481-486
Main Authors: Shindo, Takayoshi, Nakazawa, Yuta, Ozawa, Sentaro
Format: Article
Language:English
Subjects:
Aqueous solutions
Catalysis
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Hydrothermal treatment
Media
Physical Chemistry
Polymerization
Proteins
Silicon dioxide
Stability
Surface chemistry
Water pollution
Wetting
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Summary:Effect of pH in aqueous media used in the hydrothermal treatment of as-synthesized MCM-41 on the structure and the wetting stability of the resulting materials was studied using XRD, TG-DTA and N 2 adsorption. The long-range structural order and the wetting stability of the mesoporous MCM-41 were improved through hydrothermal treatment of as-synthesized sample at around pH 7 without salt addition. The pH adjustment of aqueous media toward neutral is thought to shift the polymerization equilibrium of silica species around external surface of the micelles to a higher degree of condensation, and to reduce the electrostatic repulsion between the silicate–micelle composites. This leads to the further formation of Si–O–Si network within the silica walls of the mesoporous materials, resulting in the enhancement of the structural stability of MCM-41 samples.
ISSN:1380-2224
1573-4854
DOI:10.1007/s10934-008-9222-y