Graphene Production via Cavitation Reactor Offset Nozzles
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Solution Overview
Problem
Current methods for producing graphene are environmentally hazardous, involve chemical contamination, result in defective graphene plates, and require high temperatures or mechanical deformation.
Innovation Solution
A method involving a graphite/water mixture introduced into a cavitation reactor with offset nozzles, creating a tangential effect that allows graphene planes to slip off without chemical additives or heating, resulting in high-purity, defect-free graphene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If oxidation of natural graphite with concentrated acids is used to obtain graphene oxide, then graphene can be produced in large volumes, but the process is ecologically dangerous and results in strong chemical contamination and huge number of defects in graphene plates
Solution Approach 1:
The patent replaces chemical oxidation methods with a mechanical cavitation-based exfoliation process. Graphite is processed in water using cavitation energy from offset nozzles to directly produce graphene plates without chemical additives, eliminating chemical contamination while maintaining high production volume
Solution Approach 2:
The patent changes the fundamental processing parameters from chemical oxidation to physical cavitation. By using offset nozzles creating cavitation in water, the process achieves graphene production without the harmful chemical parameters (acids, oxidants) that cause contamination and defects
2Productivity
If intercalation of graphite with various acids and subsequent thermal shock is used to obtain graphene, then graphene can be produced, but the process causes strong chemical pollution, large number of defects, and thermos-deformation
Solution Approach 1:
The patent replaces thermal and chemical processing with mechanical cavitation. The cavitation process uses physical energy from offset nozzles to exfoliate graphite in water at low temperatures, avoiding thermos-deformation and chemical pollution while producing high-quality graphene plates
Solution Approach 2:
The patent uses water as an intermediary medium instead of acids. Water serves as the processing fluid in the cavitation reactor, providing a clean, non-polluting environment that prevents chemical contamination and defects while enabling effective graphite exfoliation
3Manufacturing precision
If mechanical exfoliation of graphite in solvents or in water with addition of surfactants is used, then graphene plates can be separated, but the process results in mix of graphene plates and amorphous carbon that is very difficult to separate and pollution of graphene by solvents or surface-active substances
Solution Approach 1:
The patent extracts and eliminates the need for solvents and surfactants from the process. By using cavitation energy from offset nozzles, the process achieves effective graphene separation in pure water without requiring any chemical additives, thereby eliminating pollution while maintaining separation efficiency
Solution Approach 2:
The patent replaces chemical surfactant-based exfoliation with mechanical cavitation. The physical energy from offset nozzles creates cavitation that effectively separates graphene plates without chemical contaminants, solving both the separation efficiency and pollution problems
4Productivity
If low-temperature plasma is used to produce graphene, then graphene can be obtained, but the process results in large number of defects and deformation of graphene plates
Solution Approach 1:
The patent replaces plasma processing with water-based cavitation. The mechanical energy from offset nozzles creates cavitation in water that exfoliates graphite without the high-energy plasma environment that causes defects and deformation, preserving graphene plate integrity while maintaining production capability
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 method achieves high-purity graphene with minimal defects and edge imperfections, maintaining the structural integrity and electrical conductivity of graphene, while being environmentally friendly and cost-effective.
Implementation Method 1
introducing the graphite/water mixture into a cavitation reactor using at least two offset nozzles
Data Source
AI summary
The invention provides a method for preparing graphene which method comprises the steps of: (a) forming a graphite/water mixture; and (b) introducing the graphite/water mixture into a cavitation reactor using at least two offset nozzles; a cavitation reactor for use in the method wherein the cavitation reactor has a cavitation chamber wherein the cavitation chamber has at least two offset inlet nozzles which are directed towards the centre of the cavitation chamber and at least one outlet; and graphene having a carbon content of at least about 98 wt %.