Crosslinked Graphene Oxide Membranes That Resist Water Delamination
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Solution Overview
Problem
Existing graphene oxide (GO) membranes face challenges in maintaining a balance of selectivity, permeance, abrasion resistance, and adherence to substrates, particularly when exposed to water, limiting their effectiveness in separation applications.
Innovation Solution
A crosslinked graphene oxide (GO) and aldehyde-modified cellulose nanomaterial (ACN) composite membrane is developed, with a high GO content (60-99.999 wt%) and low ACN content (0.001-40 wt%), which is crosslinked using a crosslinker to form a dense, selective, and abrasion-resistant film on a porous substrate, enhancing adhesion and preventing delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If graphene oxide membranes are used for separation applications, then high water and water vapor permeance is achieved, but the membranes swell or delaminate when soaked in water due to hygroscopic nature
Solution Approach 1:
The patent creates a composite membrane system combining hydrophobic porous substrate with hydrophilic GO layer, where the substrate provides mechanical stability and water vapor transport while the GO layer provides selective water vapor permeance. This composite structure resolves the contradiction by assigning different functional roles to each material component.
Solution Approach 2:
The membrane structure is designed with spatially differentiated properties: the substrate layer provides mechanical strength and structural stability, while the GO coating layer provides selective permeance. This local differentiation allows each layer to optimize its specific function without compromising the other.
2Manufacturing precision
If high GO content is used in composite membranes, then selectivity is improved, but mechanical strength and abrasion resistance deteriorate
Solution Approach 1:
The membrane structure is designed with spatially differentiated properties: the substrate layer provides mechanical strength and structural stability, while the GO coating layer provides selective permeance. This local differentiation allows each layer to optimize its specific function without compromising the other.
Solution Approach 2:
The patent creates a composite membrane system combining hydrophobic porous substrate with hydrophilic GO layer, where the substrate provides mechanical stability and water vapor transport while the GO layer provides selective water vapor permeance. This composite structure resolves the contradiction by assigning different functional roles to each material component.
3Manufacturing precision
If GO membranes are used for separation applications, then good selectivity is achieved, but adherence to substrates and abrasion resistance are insufficient
Solution Approach 1:
The patent creates a composite membrane system combining hydrophobic porous substrate with hydrophilic GO layer, where the substrate provides mechanical stability and water vapor transport while the GO layer provides selective water vapor permeance. This composite structure resolves the contradiction by assigning different functional roles to each material component.
Solution Approach 2:
The membrane structure is designed with spatially differentiated properties: the substrate layer provides mechanical strength and structural stability, while the GO coating layer provides selective permeance. This local differentiation allows each layer to optimize its specific function without compromising the other.
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 composite membrane retains high water and water vapor permeance, maintains mechanical strength, and exhibits improved abrasion resistance, effectively rejecting larger particles while preserving selectivity, especially for water and water vapor separation.
Implementation Method 1
Graphene oxide (GO) membranes are known for high water and water vapor permeance
Implementation Method 2
a multilayered structure composite with one layer made of non-woven nanofibrous scaffold and a second layer composed of GO was developed for pervaporation applications such as the separation of water and ethanol
Implementation Method 3
a film of a crosslinked composite deposited on the substrate, the composite comprising 60-99.999 wt % of graphene oxide (GO) and 0.001-40 wt % of an aldehyde-modified cellulose nanomaterial (ACN)
Implementation Method 4
a surface functionalized substrate porous to a molecule of interest
Data Source
AI summary
A system involves interleaving high aspect ratio, rod-like aldehyde-modified cellulose nanomaterials (ACN) between graphene oxide (GO) sheets and utilizing crosslinkers to create a dense, crosslinked network that is highly permeable and selective to a molecule of interest, especially water and water vapor, and does not delaminate in water. This system, especially when combined with oxidative surface treatment of a membrane support substrate, leads to improved adhesion of the membrane on the substrate.