Graphene Oxide Coating on Porous Polymer Support via Amide Bonding
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Solution Overview
Problem
Conventional separation membranes, including those with graphene oxide coatings, face challenges such as low permeability and stability due to dense structures and weak bonding between the graphene oxide coating layer and the porous polymer support, leading to delamination under physical and chemical stimuli.
Innovation Solution
A composite membrane with a graphene oxide coating layer featuring an amide bond formed between the carboxyl group of graphene oxide and the amine group on the porous polymer support, enhanced by UV irradiation or plasma treatment to increase channel roughness and surface porosity, improving permeability and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If graphene oxide is coated on porous polymer support to improve selectivity and permeability, then separation performance is improved, but the coating layer easily delaminates under physical and chemical stimuli
Solution Approach 1:
A silane coupling agent is introduced as an intermediary substance between the porous polymer support and the graphene oxide coating layer. The silane coupling agent contains both inorganic and organic functional groups that can chemically bond to both surfaces, creating a stable transition layer that prevents delamination while maintaining separation performance.
Solution Approach 2:
The invention creates a composite structure consisting of three components: porous polymer support, silane coupling agent, and graphene oxide coating layer. This multi-component composite material combines the advantages of each component while mitigating their individual weaknesses, particularly the delamination issue of the graphene oxide coating.
2Reliability
If carbon membranes are produced by carbonizing polymer precursors at high temperatures to achieve high permeability and selectivity, then separation performance is improved, but mechanical properties deteriorate and production costs increase
Solution Approach 1:
The invention changes the production parameters from high-temperature carbonization (600-1000°C) to low-temperature processing. By using silane coupling agents and controlled chemical bonding, the membrane achieves high separation performance without the need for extreme temperature treatment, thereby preserving mechanical properties and reducing energy consumption.
3Productivity
If carbon nanotubes are incorporated in polymer matrix to improve gas permeability, then permeability is improved, but the trade-off between permeability and selectivity is not solved
Solution Approach 1:
The invention utilizes the inherent porous structure of graphene oxide, which contains numerous oxygen-containing functional groups and interlayer spaces. These porous features provide both high gas permeability through the interconnected channels and high selectivity through the size-sieving effect and chemical interactions with gas molecules.
4Strength
If graphene is transferred to porous polymer supports to produce composite membranes, then mechanical strength is improved, but permeability to gases decreases due to densely laminated structure
Solution Approach 1:
The invention applies local quality optimization by using graphene oxide with specific oxygen-containing functional groups distributed throughout the coating layer. These functional groups create localized hydrophilic channels and interlayer spacing that enhance gas permeability in specific regions, while the overall structure maintains mechanical strength.
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 significantly enhances permeability and stability of the composite membrane, reducing delamination and improving the lifespan of the membrane, while maintaining high gas and water permeability, even under challenging environmental conditions.
Implementation Method 1
an amide bond formed between a carboxyl group of graphene oxide and an amine group on the porous polymer support
Implementation Method 2
enhanced by UV irradiation or plasma treatment to increase channel roughness and surface porosity
Data Source
AI summary
The present invention relates to a composite film comprising a graphene oxide coating layer, a porous polymer support comprising the same, and a method for preparing the same. More particularly, the present invention relates to a composite film comprising a graphene oxide coating layer with improved permeability and stability, a porous polymer support for a composite film comprising a graphene oxide coating layer with improved permeability, and a method for preparing the same.