Method of manufacturing mesoporous silica and method of manufacturing the same
A technology of silica and ethylene glycol, applied in the direction of silica, silica, silicon compounds, etc., can solve the problems that the advantages of mesoporous silica cannot be fully utilized
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[0095] Example 1
[0096] Specific examples are given below to further illustrate the present invention, but the present invention is not limited by these examples.
[0097] First, the production method of the water-soluble silicate monomer used in the present invention will be described.
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[0098] Synthesis Example 1
[0099] 20.8 g (0.1 mol) of tetraethoxysilane and 24.9 g (0.4 mol) of ethylene glycol were added to 150 ml of acetonitrile, and 1.8 g of strongly acidic ion exchange resin (DowEX50W-X8: produced by ダウ・ケミカル) was further added as a solid catalyst , and then mix and stir at room temperature. The reaction solution, which started to separate into two layers, was uniformly dissolved after about 1 hour. Then, stirring was continued for 5 days, the solid catalyst was separated by filtration, and acetonitrile was distilled off under reduced pressure to obtain 39 g of a transparent viscous liquid. As a result of NMR analysis, the target product (tetrakis(2-hydroxyethoxy)silane) was confirmed (yield: 72.5%).
[0100] Preparation of mesoporous silica
[0101]The present inventors prepared a water-soluble silicate monomer according to the above synthesis example, and tried to prepare mesoporous silica using a nonionic surfactant and the water-soluble sili...
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[0117] Example 9
[0118] 0.8 g of surfactant POE (10 mol) phytosterol ether was added to 3.2 g of ion-exchanged water, and stirred until uniform. The surfactant solution was confirmed to be a nematic chiral liquid crystal phase by microscope observation or the like. 1.0 g of tetrakis(hydroxyethoxy)silane was added to the liquid crystal, and the mixture was stirred for 10 minutes. The solution has a clear and uniform appearance. When the solution was left to stand at 25° C. for 3 hours, the whole solution became cloudy, and the solution was left to stand for 17 hours, and the whole solution became a gel in a cloudy state. The gel was freeze-dried to remove moisture, then ethanol was added, and the solution was allowed to stand overnight at 37°C to remove the surfactant-containing ethanol solution. The remaining white powder was dried by a rotary evaporator to obtain silica powder.
[0119] The silica powder obtained in the above Example 9 was observed with a transmission...
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