MOF Layer Pore Diameter Control via Synthesis Parameters
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Solution Overview
Problem
Existing methods for manufacturing porous bodies with multiple layers of different pore diameters are cumbersome and difficult to control, as they require different surfactants and heat treatments, leading to inconsistent pore diameters and adsorption properties.
Innovation Solution
The method involves synthesizing interpenetrated and non-interpenetrated metal-organic framework layers separately by adjusting raw material concentrations and synthesis temperatures, allowing for the formation of layers with distinct pore diameters from the same materials without the need for heat treatment and surfactant removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If different surfactants are used to synthesize layers with different pore diameters, then the pore diameter can be controlled, but the manufacturing process becomes troublesome and complex
Solution Approach 1:
The patent changes the synthesis parameters (temperature and raw material concentration) to control pore diameter instead of using different surfactants. By synthesizing the first layer at higher temperature and concentration to form interpenetrated structure, and the second layer at lower temperature and concentration to form non-interpenetrated structure, the pore diameter is controlled through parameter variation rather than material substitution, simplifying the manufacturing process.
2Ease of manufacture
If heat treatment is applied to form silica layers, then the layers can be synthesized, but the silica framework contracts and the pore diameter and adsorption property change
Solution Approach 1:
The patent avoids heat treatment by using solvothermal synthesis at controlled temperatures. The synthesis temperature is carefully controlled to be below the decomposition temperature of the organic ligands, allowing the MOF structure to form without the framework contraction that occurs in silica heat treatment. This maintains the intended pore diameter and adsorption properties.
3Ease of operation
If the same materials are used for both layers, then material consistency is maintained, but the pore diameters cannot be differentiated
Solution Approach 1:
The patent uses the same metal ion and organic ligand materials for both layers but differentiates the pore diameters by changing synthesis parameters. The first layer is synthesized at higher temperature and concentration to form interpenetrated structure with smaller pores, while the second layer is synthesized at lower temperature and concentration to form non-interpenetrated structure with larger pores, achieving pore differentiation without material changes.
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
This approach simplifies the manufacturing process and effectively controls pore diameters and adsorption properties, enabling the production of porous bodies with improved water vapor adsorption capabilities.
Implementation Method 1
heating a raw material solution including a metal ion and an organic ligand to synthesize an interpenetrated metal-organic framework layer; and after synthesizing the interpenetrated metal-organic framework layer, synthesizing a non-interpenetrated metal-organic framework layer
Implementation Method 2
heating a raw material solution including a metal ion and an organic ligand to synthesize an interpenetrated metal-organic framework layer
Data Source
AI summary
Provided is a method for manufacturing a porous body by which a porous body having a plurality of layers different from each other in pore diameter can be manufactured more easily than before. The method includes heating a raw material solution including a metal ion and an organic ligand to synthesize an interpenetrated metal-organic framework layer; and after synthesizing the interpenetrated metal-organic framework layer, synthesizing a non-interpenetrated metal-organic framework layer under conditions in which concentrations of the metal ion and the organic ligand in the raw material solution and/or a heat temperature are lower than that in synthesizing the interpenetrated metal-organic framework, to obtain a porous body including the interpenetrated metal-organic framework layer and the non-interpenetrated metal-organic framework layer stacked together.