Metal Organic Framework Composite Sheet with Uniform MOF Distribution
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Solution Overview
Problem
Existing methods struggle to uniformly distribute and support a large number of metal organic frameworks (MOFs) within non-woven fabrics, leading to uneven distribution and reduced gas adsorption performance.
Innovation Solution
A method involving impregnating a sheet base material with alternating solutions of metal ions and organic ligands before drying, allowing for uniform distribution and support of MOFs throughout the fabric, including the central regions, without the use of binders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing methods are used to support MOFs in non-woven fabrics, then the production process is simple, but the distribution of MOFs is uneven and gas adsorption performance is reduced
Solution Approach 1:
The patent applies preliminary action by impregnating the non-woven fabric with metal ion solution before MOF formation, ensuring that metal ions are pre-distributed throughout the fabric including central regions. This preliminary impregnation step allows subsequent organic ligand solution to react uniformly, achieving even MOF distribution without complex equipment.
Solution Approach 2:
The patent uses the non-woven fabric itself as an intermediary carrier to distribute metal ions uniformly throughout its structure. The fabric acts as a mediator that enables subsequent MOF formation to occur evenly across the entire material, including hard-to-reach central regions, thereby achieving uniform MOF distribution through a relatively simple process.
2Quantity of substance
If a large number of MOFs are supported in the fabric, then gas adsorption capacity increases, but the flexibility of the sheet is reduced
Solution Approach 1:
The patent applies local quality by forming MOFs in situ within the non-woven fabric structure rather than coating them on the surface. This localized formation allows MOFs to be distributed throughout the fabric matrix, integrating them into the existing structure. The result is high MOF content that maintains the fabric's inherent flexibility, as the MOFs are embedded rather than added as a separate rigid layer.
3Quantity of substance
If MOFs are supported only on the surface layer, then the production process is simple, but the gas adsorption performance is reduced
Solution Approach 1:
The patent uses hydraulic principles by employing solution impregnation to penetrate and distribute metal ions throughout the non-woven fabric. The liquid solution naturally flows through the porous fabric structure, reaching central regions that would be difficult to access with other methods. This hydraulic approach enables uniform MOF distribution throughout the entire fabric volume with a simple impregnation process.
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 method enables a composite sheet with high gas adsorption performance by uniformly supporting a large number of MOFs on the surface and within the fabric, enhancing gas adsorption capacity and maintaining flexibility.
Implementation Method 1
The sheet base material can be impregnated with the first raw material solution. The sheet base material can be impregnated with the second raw material solution before the first raw material solution with which the sheet base material is impregnated dries.
Implementation Method 2
a first raw material solution and a second raw material solution can be prepared, in which the first raw material solution includes either a metal ion or an organic ligand that are raw materials of the metal organic framework particles and the second raw material solution includes the other
Implementation Method 3
The sheet base material impregnated with the second raw material solution can be dried.
Data Source
AI summary
A composite sheet can include one or more metal organic frameworks dispersed in a sheet base material formed of fibers. The one or more metal organic frameworks can be supported on surfaces of the fibers. After a heat treatment, a ratio of a mass of the one or more metal organic frameworks to a mass of the entire composite sheet can be 80 mass % or more. One fiber forming a central region of the composite sheet in a thickness direction can have a surface coverage by the metal organic frameworks of 60% or more. A surface exposure ratio of the one or more metal organic frameworks can be 50% or more.