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

Inactive Publication Date: 2008-09-24
SHISEIDO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the advantages of non-ionic surfactants, which can form associations without electrolyte, cannot be fully utilized in the formation of mesoporous silica by using conventional silicate monomers.

Method used

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  • Method of manufacturing mesoporous silica and method of manufacturing the same
  • Method of manufacturing mesoporous silica and method of manufacturing the same
  • Method of manufacturing mesoporous silica and method of manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] Specific examples are given below to further describe the present invention in detail, 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.

Synthetic example 1

[0099] Add 20.8g (0.1mol) of tetraethoxysilane and 24.9g (0.4mol) of ethylene glycol to 150ml of acetonitrile, and further add 1.8g of strongly acidic ion exchange resin (Dow EX50W-X8: manufactured by Dow Chemical) as a solid catalyst , and then mixed and stirred at room temperature. The reaction solution which started to separate into two layers was uniformly dissolved after about 1 hour. Stirring was then 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, it was confirmed that it was the target product (tetrakis(2-hydroxyethoxy)silane) (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 by using a nonionic surfactant and the water-soluble silicate monomer.

[010...

Embodiment 9

[0118] Add 0.8 g of surfactant POE (10 mol) phytosterol ether into 3.2 g of ion-exchanged water, and stir until uniform. It was confirmed by microscopic observation or the like that this surfactant solution was a nematic chiral liquid crystal phase. 1.0 g of tetrakis(hydroxyethoxy)silane was added to this liquid crystal, and it stirred for 10 minutes. The solution was transparent and homogeneous in appearance. When the solution was left to stand at 25° C. for 3 hours, the entire solution became cloudy, and when it was left to stand for 17 hours, the entire solution formed a gel in a cloudy state. The gel was freeze-dried to remove water, and then ethanol was added and left to stand overnight at 37°C to remove the ethanol solution containing the surfactant. The remaining white powder was dried by a rotary evaporator to obtain silica powder.

[0119] The silica powder obtained in Example 9 above was observed by a transmission electron microscope, and it was confirmed that the...

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Abstract

Disclosed is a method for production of a mesoporous silica under electrolyte-free conditions by using a surfactant aggregate structure as a template. Also disclosed is a mesoporous silica having a novel geometrical structure which has not been produced heretofore. A mesoporous silica can be produced under electrolyte-free conditions by reacting a nonionic surfactant with a water-soluble silicate monomer having a specific structure under neutral conditions. A nonionic surfactant may be used which can form a ribbon phase or nematic phase at appropriate temperature range and concentration range when dissolved in water. By using the nonionic surfactant, a sheet-like mesoporous silica can be prepared.

Description

[0001] related application [0002] This application claims the priority of Japanese Patent Application No. 2005-234777 filed on August 12, 2005 and Japanese Patent Application No. 2005-344421 filed on November 29, 2005, and is incorporated herein by reference. technical field [0003] The present invention relates to mesoporous silica and its preparation method, in particular to the improvement of the preparation method of mesoporous silica using the association structure of surfactant as a template, and the flaky mesoporous silica obtained therefrom. Background technique [0004] Porous bodies (porous materials) are generally classified into micropores, mesopores, and macropores, respectively, according to their pore diameters, those of 2 nm or less, those of 2 to 50 nm, and those of 50 nm or more. Mesoporous silica prepared by a template method using surfactant micelles for casting molds has a high specific surface area and uniform fine pore diameter. Due to its structur...

Claims

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Application Information

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IPC IPC(8): C01B37/02C01B33/12
Inventor 高桥俊坂本一民樋渡幸三
Owner SHISEIDO CO LTD
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