One-Step Preparation of Porous Silica Spheres from Sodium Silicate Using Triblock Copolymer Templating

Mesoporous and microporous monodispersed silica spheres have been prepared using a simple one-step synthetic procedure from an aqueous reaction mixture consisting of a commercial sodium silicate solution, various Pluronic triblock copolymers, and HCl or HNO3. The formation of porous silica spheres 1...

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Bibliographic Details
Published in:Chemistry of materials 2004-10, Vol.16 (21), p.4181-4186
Main Authors: Kosuge, Katsunori, Kikukawa, Nobuyuki, Takemori, Makoto
Format: Article
Language:English
Subjects:
Applied sciences
Chemistry
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
General and physical chemistry
Physicochemistry of polymers
Physics
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Summary:Mesoporous and microporous monodispersed silica spheres have been prepared using a simple one-step synthetic procedure from an aqueous reaction mixture consisting of a commercial sodium silicate solution, various Pluronic triblock copolymers, and HCl or HNO3. The formation of porous silica spheres 130−225 μm in diameter was observed over a moderately wide range of reaction conditions. The pore structures of the resultant spheres lacked any long-range order, although they did exhibit outer textural uniformity. We concluded that the well-defined spherical morphology and pore sizes were the result of a combined effect of the EO/(EO + PO) block ratio and molecular weight of the Pluronics and the counteranions of the acid source.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm0400177