Graphene Production Using AC Joule Heating and Compression
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Solution Overview
Problem
Existing methods for graphene production using flash joule heating are limited to small-scale conversion of carbon-based feedstock and require direct current electrical power, which is inefficient for industrial-scale applications.
Innovation Solution
A system and method utilizing alternating current power sources and compression systems to convert large masses of carbon-based feedstock into graphene, with adjustable electrical resistance and controlled joule heating phases, producing graphene with higher crystallinity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct current electrical power is used for flash joule heating, then small-scale graphene conversion is achieved, but industrial-scale production is limited
Solution Approach 1:
The patent changes the electrical power source from direct current to alternating current, enabling industrial-scale graphene production. The AC power source with variable frequency and voltage allows scaling from laboratory to industrial production while maintaining process control through parameter adjustment.
Solution Approach 2:
The patent introduces dynamic control of electrical parameters (frequency, voltage, current) during the joule heating process. The compression force is also dynamically adjusted to optimize electrical resistance and heat generation, enabling scalable industrial production while maintaining product quality.
2Use of energy by moving object
If compression force is applied to adjust feedstock electrical resistance, then joule heating efficiency is improved, but system complexity increases
Solution Approach 1:
The patent combines the compression system with the joule heating apparatus, integrating mechanical compression and electrical heating functions into a single system. This merging reduces overall system complexity while improving heating efficiency through coordinated control of compression force and electrical parameters.
Solution Approach 2:
The compression system automatically adjusts feedstock electrical resistance to optimal levels for efficient joule heating. The system self-regulates by monitoring electrical parameters and dynamically modifying compression force, eliminating the need for external manual adjustment and reducing operational complexity.
3Productivity
If alternating current power source is used with variable frequency and voltage, then industrial-scale production is enabled, but process control difficulty increases
Solution Approach 1:
The patent implements feedback control systems that continuously monitor electrical parameters (frequency, voltage, current, resistance) and process conditions. The system automatically adjusts AC power source parameters and compression force based on real-time feedback, enabling industrial-scale production while maintaining precise process control through closed-loop regulation.
Solution Approach 2:
The patent creates a multi-functional control system that manages multiple parameters (electrical and mechanical) through a single integrated controller. This universal control approach simplifies operation by providing centralized monitoring and adjustment of all process variables, reducing control difficulty despite the complexity of AC power and compression coordination.
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
Enables the production of graphene on an industrial scale with enhanced crystallinity, utilizing a wide range of carbon feedstocks and secondary materials, and varying power phases to optimize conversion efficiency.
Implementation Method 1
The feedstock acts as a resistive electrical load and comprises a mass of at least 0.1 Kg. The device further includes a plurality of electrodes configured to transmit an electrical current through the feedstock to joule heat the feedstock.
Implementation Method 2
The device further includes a compression system configured to compress the feedstock with a compression force to adjust feedstock electrical resistance.
Data Source
AI summary
Provided is a device, method, and material for converting a feedstock to a resultant material having a higher degree of crystallinity than the feedstock. The device includes a constraining reservoir configured to constrain the feedstock which forms a resistive electrical load and comprise a mass of at least. 1 kg. The device further includes electrodes configured to transmit an electrical current through the feedstock to joule heat the feedstock; a compression system configured to compress the feedstock to adjust feedstock electrical resistance; and an alternating current (AC) power source electrically connected to the electrodes. The device further includes an electric controller to control an electric current delivered to the feedstock. The method further includes filing the constraining reservoir with the feedstock, compressing the feedstock, electronically connecting the feedstock to the AC power source, and applying the electrical power to the resistive load until a limit is reached.