Biochar Graphene Exfoliation via Sonic Frequency and Magnetic Flux
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Solution Overview
Problem
Current methods for producing graphene, such as mechanical cleavage, liquid-phase exfoliation, and chemical vapor deposition, face challenges like low yield ratios, high energy consumption, and the use of expensive substrates, making it difficult to obtain high-quality graphene efficiently.
Innovation Solution
The method involves aqueous liquid phase exfoliation using sonic energy to extract graphene from biochar feedstocks, which includes dispersing biochar in water with dilute acids and applying sonic energy to exfoliate graphene, followed by collection and drying to produce high-quality graphene layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods (mechanical cleavage, liquid-phase exfoliation, CVD) are used to produce graphene, then graphene can be obtained, but the yield ratio is low and energy consumption is high
Solution Approach 1:
The patent changes the physical and chemical parameters of the exfoliation process by using acidic liquid baths (changing chemical environment) and applying sonic frequencies (changing mechanical energy parameters). This combination enables efficient breakdown of biochar into graphene while maintaining lower energy consumption compared to conventional high-energy methods like mechanical cleavage or CVD
Solution Approach 2:
The patent replaces traditional mechanical cleavage methods with a chemical-acoustic hybrid system. Instead of using high mechanical force to exfoliate graphene layers, the invention uses acidic liquid penetration combined with sonic vibration to achieve layer separation, thereby reducing overall mechanical energy requirements while improving yield
2Productivity
If conventional methods are used to produce graphene, then graphene can be obtained, but expensive substrates are required
Solution Approach 1:
The patent employs inexpensive, readily available materials throughout the process: biochar as feedstock, dilute acids as chemical agents, and water as solvent. These cheap, easily replaceable materials eliminate the need for expensive specialized substrates required by conventional methods, while still achieving high-quality graphene production
Solution Approach 2:
The invention uses biochar, an abundant and low-cost material, as the source of carbon for graphene production. The acidic liquid bath system is self-regenerating through continuous circulation and reuse, reducing the need for expensive consumable substrates while maintaining high production efficiency
3Productivity
If biochar is used as feedstock with acidic liquid bath and sonic energy, then high-quality graphene can be produced efficiently, but the process complexity increases
Solution Approach 1:
The patent combines chemical action (acidic liquid penetration) with physical action (sonic energy) into a unified exfoliation process. This merging of two mechanisms into one integrated system achieves high-quality graphene production efficiently, while the combined approach actually simplifies the overall process compared to using multiple separate treatment steps
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 enables the efficient production of high-quality graphene with varying yields, using cost-effective biochar feedstocks and reducing energy consumption, while providing a safer handling form by producing graphene in powder form, which can be further analyzed for quality using techniques like BET and XRD.
Implementation Method 1
exfoliation by exposing the dispersion to sonic energy
Implementation Method 2
applying ultrasonic, mega-sonic, sonic and sub-sonic frequencies
Implementation Method 3
magnetic flux from magnets
Implementation Method 4
heating the liquid sufficient to cause exfoliation of the pyrolytic carbon
Data Source
AI summary
A process for the efficient and cost-effective preparation of graphene from a natural source of carbon, resulting from the combination of mild, natural acids, including citric and acetic acids, with sonic frequency, as well as the use of magnets, to exfoliate graphene nanoplatelets from the natural carbon source. The natural carbon source, referred to as Biochar, can be any organic matter based and converted via pyrolytic and/or gasification means. The process includes tuning the frequency of sound energy to maximize the rate of exfoliation to a resonant frequency with the feed material itself, with a range anywhere between 1 Hz-1 THz. The use of magnets, including ferrous magnets, applies electromagnetic pressure on the as yet exfoliated Biochar fragments, which moves the fragments into the field of sound energy. The resonant exfoliation process that takes place within the bath itself, results in the hexagonal structure needed to produce graphene.