Preparation of Self-Standing Transparent Films of Silica-Surfactant Mesostructured Materials and the Conversion to Porous Silica Films

Ogawa, Makoto; Kikuchi, Takaaki

doi:10.1002/(sici)1521-4095(199810)10:14<1077::aid-adma1077>3.0.co;2-q

Cited by 64 publications

(13 citation statements)

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“…[1][2][3][4] The morphology of mesoporous silicas is an important issue for their practical applications, 5 so that the syntheses of mesoporous silicas in such morphology as coating films, 6,7 self-standing films, [8][9][10][11] monoliths, 12,13 fibers, 14,15 hollow spheres, [15][16][17][18][19][20][21][22][23][24][25] and dense spheres have been reported.…”

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confidence: 99%

Growth of Nanoporous Silica Spherical Particles by the Stöber Method Combined with Supramolecular Templating Approach

Shimura

Ogawa²

2005

Bulletin of the Chemical Society of Japan

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Nanoporous silica spherical particles with narrow particle size distributions (standard deviation: 0.03-0.22) were synthesized by the Stöber method combined with supramolecular templating approach using tetraethoxysilane and cetyltrimethylammonium chloride. The reaction was conducted at 276 K to observe particle growth. Particles formed after the reaction for ca. 0.5 h, as shown by the fact that the solution became turbid. After the reaction for 0.5 h, particles with an average particle size of 440 nm in diameter were collected by filtration. The particles grew until the silica source was completely consumed. This took 50 h under the present reaction condition. The average particle size reached to ca. 1.8 mm at this stage. The calcined particles were porous with the surface areas of 380-1060 m 2 g À1 and the pore diameter of 1.6-2.0 nm. Mesoporous silicas prepared by supramolecular templating approach have been investigated as adsorbents, catalysts, and nano-reactors owing to their large surface area, pore size uniformity, and possible surface engineering. 1-4 The morphology of mesoporous silicas is an important issue for their practical applications, 5 so that the syntheses of mesoporous silicas in such morphology as coating films, 6,7 self-standing films, 8-11 monoliths, 12,13 fibers, 14,15 hollow spheres, 15-25 and dense spheres 26-50 have been reported.Mesoporous silica spherical particles with controlled size and size distribution are attractive materials for such uses as optics and chromatography. 50 Accordingly, the preparation of mesoporous silica spherical particles has been reported so far 26-50 utilizing various synthetic approaches including those based on emulsion chemistry 47 and using morphology template. 48 The Stöber method, which was developed for the preparation of silica spherical particles with controlled particle size, 51,52 was also employed to prepare surfactant templated mesoporous silica spherical particles. [26][27][28][29][30][31][32][33][34][35] The preparation of the mesoporous silica particles with the particle size of 60-2300 nm have been reported so far. [26][27][28][29][30][31][32][33][34][35] However, because there are many factors, such as chemical composition and synthetic temperature, which affect the particle sizes, the relationships between the synthetic condition and the particle size are not fully understood. In addition, the particle size of the reported spherical particles 26-35 was ca. 2 nm.So further study on the preparation of nanoporous silica spherical particles with different size and pore geometry is worth investigating. In the present study, we prepared surfactant-silica spherical particles at a low temperature (276 K) in order to follow their growth and to investigate the particle size and nanostructures of the products. Experimental Materials.Tetraethoxysilane (abbreviated as TEOS) and cetyltrimethylammonium chloride (abbreviated as CTAC) were obtained from Tokyo Kasei Kogyo Co., Ltd. and were used without further purification. Sodium hydroxide, methanol and 2...

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Growth of Nanoporous Silica Spherical Particles by the Stöber Method Combined with Supramolecular Templating Approach

Shimura

Ogawa²

2005

Bulletin of the Chemical Society of Japan

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“…Mesoporous materials [1][2][3][4][5][6] synthesized using molecular self-assemblies of surfactants as the structure directing agents have highly ordered pore structures with high surface area and these have attracted attention in terms of the possible application to high performance catalysts, adsorbents and separating materials. The synthesis of mesoporous materials with various pore structures [7,8], morphology [9,10] and inorganic walls bearing catalytic activities [11][12][13][14] have been widely studied.…”

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confidence: 99%

Fabrication and Pore Size Control of Large-Pore Mesoporous Silica Particles through a Solvent Evaporation Process

Shibata

Ogura

Nishio

et al. 2011

Silicon

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Large-pore mesoporous silica particles were synthesized through a solvent evaporation process using hydrophobic fumed silica particles and tetraethyl orthosilicate (TEOS) as silica sources. The solvent evaporation of an ethanol solution of fumed silica particles, TEOS, HCl and triblock copolymer (F127) resulted in mesoporous silica particles with pores with sizes of about 7 nm. In addition, the interplanar spacing of the mesoporous silica particles can be controlled by changing the solvent evaporation temperatures.

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“…Mesoporous materials [1][2][3][4][5][6] with tailored pore structures and high surface areas have gathered increasing attention because of their possible application as adsorbent, catalyst, and separatory materials. Among the transition metal oxides, TiO 2 is one of the most promising candidates for applications in photocatalysis [7], solar cells [8] sensors [9], and displays [10].…”

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confidence: 99%

Effect of Block Copolymer Additives on the Structure and Crystallinity of Nanostructured Mesoporous TiO2

Teoh

2009

CNANO

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In this study, nanostructured mesoporous TiO2 was prepared by sol-gel process, and the synthesis was accomplished by using block copolymer as the structure-directing agent and TiCl4 as the inorganic precursor. TGA, XRD, SAXS, TEM and N2 adsorptiondesorption isotherms were used to characterize the microstructure, pore size, and pore structure after calcination. The powders were found to have a wormhole-like pore structure after calcination. When the addition of block copolymer increased from 0.1 to 1.5 g, the specific surface areas increased from 113.23 to 284.75 m 2 /g, but the average pore sizes decreased from 7.4 to 4.8 nm, and the average crystallite sizes decreased from 9.0 to 5.5 nm after being calcinated at 300 °C for 5 h. These results show that the mesostructure and crystallinity of TiO2 can be controlled by the additive concentrations of block copolymer.

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Preparation of Self-Standing Transparent Films of Silica-Surfactant Mesostructured Materials and the Conversion to Porous Silica Films

Cited by 64 publications

References 7 publications

Growth of Nanoporous Silica Spherical Particles by the Stöber Method Combined with Supramolecular Templating Approach

Growth of Nanoporous Silica Spherical Particles by the Stöber Method Combined with Supramolecular Templating Approach

Fabrication and Pore Size Control of Large-Pore Mesoporous Silica Particles through a Solvent Evaporation Process

Effect of Block Copolymer Additives on the Structure and Crystallinity of Nanostructured Mesoporous TiO2

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