Graphene Membrane Nanopore Control via Defect Nucleation
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Solution Overview
Problem
Current reverse osmosis membranes face high energy consumption and cost issues due to inefficiencies in water flux and salt rejection, with challenges in fabricating defect-free monolayer graphene and forming nanoscale pores, leading to high process costs and low efficiency.
Innovation Solution
A graphene-based porous membrane is developed using monolayer graphene with defects, where a deposition layer is applied to control nanopore formation, allowing for adjustable pore sizes and high salt rejection, and incorporating metals or metal oxides to enhance water flux and permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If defect-free monolayer graphene is fabricated, then membrane stability and strength are improved, but manufacturing complexity and process cost increase
Solution Approach 1:
The patent converts the harmful effect of graphene defects into a beneficial feature by using defects as nucleation sites for pore formation. Instead of attempting to eliminate defects, the invention utilizes them to create controlled nanopores in the membrane structure, thereby simplifying the manufacturing process while maintaining membrane functionality.
Solution Approach 2:
The patent applies porous material principles by forming nanopores within the graphene structure at defect sites. This creates a porous graphene membrane that allows selective permeation while using the natural defect distribution to simplify pore formation, avoiding complex manufacturing processes.
2Reliability
If nanoscale pores are formed in monolayer graphene, then salt rejection is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent converts the manufacturing challenge of precise pore formation into a simplified process by using defect sites as natural templates. The defects in graphene serve as predetermined locations where pores form spontaneously during membrane formation, eliminating the need for complex precision manufacturing techniques.
Solution Approach 2:
The patent applies self-service by allowing the membrane formation process to automatically position pores at defect sites without external intervention. The defect distribution naturally determines pore location, and the membrane formation process self-organizes to create uniformly distributed nanopores at these predetermined sites.
3Ease of manufacture
If traditional polymeric reverse osmosis membranes are used, then manufacturing ease is maintained, but energy consumption increases
Solution Approach 1:
The patent uses composite material principles by combining graphene with pore-forming agents or deposition layers to create a hybrid membrane structure. This composite approach maintains the ease of manufacturing graphene-based membranes while achieving superior water flux and salt rejection properties that reduce energy consumption.
Solution Approach 2:
The patent applies parameter changes by modifying the physical and chemical properties of graphene through controlled pore formation and deposition layer addition. These parameter changes in membrane structure and composition enable enhanced water flux and salt rejection, leading to reduced energy consumption compared to traditional polymeric membranes.
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 graphene-based membrane achieves significantly higher water flux and salt rejection rates compared to traditional polymeric membranes, reducing energy consumption and production costs while enabling efficient desalination and versatile membrane applications.
Implementation Method 1
partially forming a deposition layer on the graphene sheet
Implementation Method 2
nanoscale pores may be sized to be impermeable to salt and permeable to water
Data Source
AI summary
Disclosed herein are a graphene-based membrane and a method of manufacturing the same. The graphene-based membrane includes: monolayer graphene containing defects; a deposition layer disposed on the defects; and nanopores surrounded by the deposition layer. The method of manufacturing a graphene-based membrane includes forming a monolayer graphene sheet and partially forming a deposition layer on the graphene sheet.