Graphene Exfoliation via Block Copolymer Mediator
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Solution Overview
Problem
Current methods for preparing graphene suffer from low exfoliation yield, high defect generation, and difficulty in producing large-area, thin graphene sheets, making them unsuitable for mass production and efficient applications.
Innovation Solution
A method involving high-pressure homogenization and a novel block copolymer is used to exfoliate graphite, where the block copolymer with hydrophilic and hydrophobic blocks mediates the exfoliation process, enhancing efficiency and dispersion stability of graphene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If chemical oxidation method is used to exfoliate graphite, then graphene can be obtained, but a number of defects are generated on the graphene
Solution Approach 1:
The patent uses an intercalation compound as an intermediary substance that inserts between graphite layers to facilitate exfoliation. This mediator enables mechanical or thermal exfoliation without chemical oxidation, thus obtaining graphene with fewer defects while maintaining high yield
Solution Approach 2:
The patent replaces chemical oxidation methods with mechanical exfoliation methods (such as thermal expansion or shear force) to separate graphite layers. This substitution eliminates the need for harsh chemical treatments that cause defects, preserving graphene quality
2Quantity of substance
If intercalation compound method is used to exfoliate graphite, then graphene can be obtained, but the process becomes complicated and yield is insufficient
Solution Approach 1:
The patent extracts and eliminates the complex intercalation compound treatment steps from the process. By using direct mechanical or thermal exfoliation methods, it removes unnecessary intermediate steps while maintaining effective graphene production
Solution Approach 2:
Instead of using complex chemical intercalation to enable exfoliation, the patent inverts the approach by using simple physical methods (thermal expansion or shear force) that directly exfoliate graphite without requiring intercalation compounds
3Shape
If milling method using ultrasonic irradiation or ball mill is used to exfoliate graphite, then graphene can be obtained, but it is difficult to obtain graphene with sufficiently small thickness and large area
Solution Approach 1:
The patent changes the exfoliation mechanism from mechanical milling to thermal expansion or controlled shear force application. This parameter change enables better control over graphene thickness and area, producing larger and thinner sheets with higher quality
Solution Approach 2:
The patent utilizes controlled mechanical vibration or shear force (rather than harsh milling) to exfoliate graphite. This gentle mechanical action preserves graphene integrity, enabling production of large-area, thin sheets without excessive fragmentation
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 significantly increases the exfoliation efficiency and dispersion stability of graphene, producing high-quality, thin, and large-area graphene sheets with reduced defects, suitable for various applications.
Implementation Method 1
passing a feed solution including graphite through a homogenizer to apply a shear force to the graphite in the feed solution to exfoliate the graphite
Implementation Method 2
applying a shear force to the graphite in the feed solution to exfoliate the graphite
Implementation Method 3
using a surface active block copolymer to disperse graphene in aqueous medium
Implementation Method 4
a method wherein a graphene sheet is exfoliated from graphite by a physical method such as using a tape
Data Source
Figure 1(a)~1(b)
Figure 2~3
Figure 4(a)~4(d)
AI summary
The present invention relates to a method for preparing graphene using a novel block copolymer. The present invention has features that, by using the block copolymer to mediate graphene that is hydrophobic and a solvent of a feed solution that is hydrophilic, the exfoliation efficiency of graphene as well as the dispersion stability thereof can be increased during high-pressure homogenization.