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Hydrolysis-stable mesoporous silica material and method for producing it

A mesoporous silica, hydrolytically stable technology, used in silica, silica, chemical instruments and methods, etc., can solve problems such as the detachment of organic functional groups

Inactive Publication Date: 2016-10-26
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a risk with this material that the Si-O-Si bonds that achieve strong bonding of the organic functional groups on the pore surface necessary for the hydrophilization of the pore surface may be hydrolyzed and these organic functional groups may be detached as a result.
Another risk is SiO 2 Hydrolyzability of the pore framework, since many of these materials have a thickness of only a few SiO 2 extremely thin pore walls

Method used

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  • Hydrolysis-stable mesoporous silica material and method for producing it
  • Hydrolysis-stable mesoporous silica material and method for producing it
  • Hydrolysis-stable mesoporous silica material and method for producing it

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Embodiment Construction

[0032] Embodiments of the invention

[0033] In a first embodiment of the invention, 1 g of MCM-48 material (Mobile composition Matter No. 48) with a pore diameter of 4.5 nm and a SiOH group density of 3 mmol / g was mixed with 3 mmol 3 - Glycidoxypropyl-trimethoxysilane and 1 mmol of tetraethylenepentamine were reacted in toluene at a temperature of 100° C. for 8 hours. 3-Glycidoxypropyl-trimethoxysilane is of formula Y x SiR 4-x silanes, where Y = CH 3 O and R = (CH 2 ) 3 OCH 2 (CHOH)CH 2 . According to formula 1, c=6, n=0, o=2, H=3. according to figure 1 The reaction scheme shown in , after methanol elimination, forms a hydrolytically stable mesoporous silica material with two functional groups that are respectively tripodally cross-linked. has the formula O on its surface x SiR 4-x of functional groups, where x = 1. For this, H = 3 according to formula 1 applies. The group R of each of the two functional groups is via NH(CH 2 )2 NH(CH 2 ) 2 NH(CH 2 ) 2 NH(...

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Abstract

The invention relates to a hydrolysis-stable mesoporous silica material and method for producing it. At least 1-3 of the nitrogen atoms and of the oxygen atoms carries in each case at least one hydrogen atom or is ionic. At least one radical R of a functional group is crosslinked with another radical R of a different functional group. The material is produced by providing a mesoporous silica material and functionalizing the surface of the mesoporous silica material with at least one silane of formula YxSiR4-x, where x is in a range from 1-3 and where Y is a functional group which reacts with a hydroxyl group on the surface of the mesoporous silica material. There is crosslinking of the surface functionalities by treatment with a coupling reagent having at least two reactive groups, each reactive group reacting with a radical R.

Description

technical field [0001] The present invention relates to hydrolytically stable mesoporous silica materials and methods of preparing the hydrolytically stable mesoporous silica materials. The invention also relates to the use of the hydrolytically stable mesoporous silica material as sensor material. Background technique [0002] Surface-functionalized mesoporous silica materials can be used for sensor applications in aqueous gases. The pores of these functionalized materials have functional groups that are capable of reacting alkaline with water. The carbon dioxide content of the aqueous gas can thus be determined, for example, by measuring changes in the electrical properties of the material via electrodes mounted on the functionalised material. For this application, it is necessary to embed liquid water in the pores by means of capillary condensation. However, there is a risk with this material that the Si—O—Si bonds that achieve strong bonding of the organic functional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12G01N27/00
CPCC01B33/12C01P2006/12C01P2006/16G01N27/00C07F7/1804C07F7/188G01N33/004
Inventor M.维登迈尔T.皮尔茨
Owner ROBERT BOSCH GMBH