Preparation of Organized Mesoporous Silica from Sodium Metasilicate Solutions in Alkaline Medium Using Nonionic Surfactants

[img]PDF - Authorized users only
Language: English
311Kb
Title:Preparation of Organized Mesoporous Silica from Sodium Metasilicate Solutions in Alkaline Medium Using Nonionic Surfactants
Creators:
Zukalová, Markéta
Rathouský, Jiří
Zukal, Arnošt
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 68, 10, pp. 2019-2031
Uncontrolled Keywords:Heterogeneous catalysis, Homogeneous precipitation, Silicates, Sodium metasilicate, Spherical morphology, Nonionic surfactants, Mesoporous SiO<sub>2</sub>

Abstract

A new procedure has been developed, which is based on homogeneous precipitation of organized mesoporous silica from an aqueous solution of sodium metasilicate and a nonionic poly(ethylene oxide) surfactant serving as a structure-directing agent. The decrease in pH, which induces the polycondensation of silica, is achieved by hydrolysis of ethyl acetate. Owing to the complexation of Na<sup>+</sup> cations by poly(ethylene oxide) segments, assembling of the mesostructure appears to occur under electrostatic control by the S<sup>0</sup>Na<sup>+</sup>I<sup>-</sup> pathway, where S<sup>0</sup> and I<sup>-</sup> are surfactant and inorganic species, respectively. As the complexation of Na<sup>+</sup> cations causes extended conformation of poly(ethylene oxide) segments, the pore size and pore volume of organized mesoporous silica increase in comparison with materials prepared under neutral or acidic conditions. The assembling of particles can be fully separated from their solidification, which results in the formation of highly regular spherical particles of mesoporous silica. <p>

Title:Preparation of Organized Mesoporous Silica from Sodium Metasilicate Solutions in Alkaline Medium Using Nonionic Surfactants
Creators:
Zukalová, Markéta
Rathouský, Jiří
Zukal, Arnošt
Uncontrolled Keywords:Heterogeneous catalysis, Homogeneous precipitation, Silicates, Sodium metasilicate, Spherical morphology, Nonionic surfactants, Mesoporous SiO<sub>2</sub>
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:68
Number:10
Page Range:pp. 2019-2031
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc20032019UNSPECIFIED
ID Code:2168
Item Type:Article
Deposited On:06 Feb 2009 17:16
Last Modified:06 Feb 2009 16:16

Citation

Zukalová, Markéta; Rathouský, Jiří; Zukal, Arnošt (2003) Preparation of Organized Mesoporous Silica from Sodium Metasilicate Solutions in Alkaline Medium Using Nonionic Surfactants. Collection of Czechoslovak Chemical Communications, 68 (10). pp. 2019-2031. ISSN 0010-0765

Repository Staff Only: item control page