Hydrolysis-Stable Mesoporous Silica via Crosslinked Functional Groups
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Surface-functionalized mesoporous silica materials used for sensing in water-containing gases face hydrolysis risks due to Si—O—Si bond instability and detachment of organic functionalities, compromising their hydrophilicity and structural integrity.
Innovation Solution
The development of hydrolysis-stable mesoporous silica materials with functional groups of the formula OxSiR4-x, where x is 1 to 3, featuring crosslinked radicals with high hydrophilicity and multipodal attachment to the silica surface, enhancing stability and chemical properties for sensor applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If Si—O—Si bonds are used to produce firm attachment of organic functionalities to the pore surface, then the attachment strength is improved, but the hydrolysis stability deteriorates
Solution Approach 1:
The patent introduces intermediary groups (such as carbonate, carboxylate, or hydroxyl groups) between the silica framework and the organic functionalities. These intermediary groups act as mediators that provide both strong attachment to the silica surface and resistance to hydrolysis, thereby resolving the contradiction between attachment strength and hydrolysis stability.
Solution Approach 2:
The patent creates composite structures by combining silica framework with organic functionalities through intermediary groups. This composite approach allows the material to exhibit both the structural stability of silica and the hydrolysis resistance provided by the intermediary organic groups, achieving both strong attachment and hydrolysis stability simultaneously.
2Area of stationary object
If the pore wall thickness is reduced to enhance surface area, then the surface area is improved, but the hydrolysis stability deteriorates
Solution Approach 1:
The patent applies intermediary groups on the pore surface that provide hydrolysis resistance even in thin pore walls. These intermediary groups act as protective mediators that prevent hydrolysis of the silica framework while maintaining the high surface area provided by thin pore walls, thus resolving the contradiction between surface area and hydrolysis stability.
3Adaptability or versatility
If organic functionalities are incorporated to provide hydrophilicity, then the hydrophilicity is improved, but the hydrolysis stability deteriorates
Solution Approach 1:
The patent uses intermediary groups as mediators that provide hydrophilicity while maintaining hydrolysis stability. These intermediary groups (carbonate, carboxylate, hydroxyl) are chemically stable and resistant to hydrolysis, yet they provide the necessary hydrophilic properties for sensor applications, thereby resolving the contradiction between hydrophilicity and hydrolysis stability.
Solution Approach 2:
The patent modifies the chemical parameters of the functional groups to achieve both hydrophilicity and hydrolysis stability. By selecting specific intermediary groups with appropriate chemical properties, the material achieves the desired hydrophilicity while maintaining structural stability against hydrolysis, thus resolving the contradiction through parameter optimization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a highly stable and hydrophilic mesoporous silica material suitable for determining carbon dioxide content, with improved resistance to hydrolysis and increased durability of the silica framework, ensuring effective sensor performance in water-containing gases.
Implementation Method 1
This application requires the incorporation of liquid water into the pores by means of capillary condensation
Implementation Method 2
the risk exists of the Si—O—Si bonds, which produce the firm attachment to the pore surface of the organic functionalities that are needed for hydrophilization of the pore surface, undergoing hydrolysis and in this way the organic functionalities possibly become detached
Data Source
AI summary
A hydrolysis-stable mesoporous silica material has surface bearing functional groups of formula OxSiR4-x, where x is in a range from 1-3 and where each of the radicals R independently of any other contains c carbon atoms, n nitrogen atoms and o oxygen atoms, for whichc+no>0.35.At least ⅓ 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.