Graphenic Carbon Particles With Controlled Aspect Ratio and Surface Area
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Solution Overview
Problem
Existing graphenic carbon particles often have low aspect ratios, low specific surface areas, and high oxygen content, which affect their dispersion and conductivity properties, limiting their effectiveness in composite materials.
Innovation Solution
Producing graphenic carbon particles with an aspect ratio of greater than 3:1, a B.E.T. specific surface area of at least 50 square meters per gram, and a Raman spectroscopy 2D/G peak ratio of at least 1:1, and a crystallite size of at least 1:1, and a crystallite size of less than 10 nanometers, such as no more than 10 micrometers, such as no more than 5 micrometers, such as no more than 5 nanometers, such as no more than 5 micrometers, such as no more than 5 nanometers, such as no more than 5 micrometers, wherein the particles are characterized by comprising one or more layers of one atom thick sheets of sp2-named carbon atoms that are densely packed in a honeycomb crystal lattice.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional thermal processes are used to produce graphenic carbon particles, then production cost is reduced, but aspect ratio and specific surface area are insufficient
Solution Approach 1:
The patent changes thermal process parameters including temperature profiles, heating rates, and atmosphere composition to produce particles with aspect ratios greater than 3:1 and specific surface areas of at least 50 m²/g. By optimizing these parameters, the process achieves improved particle morphology without requiring fundamentally new manufacturing approaches.
Solution Approach 2:
The patent employs periodic thermal cycling and controlled atmosphere changes during the thermal process to enhance particle aspect ratio and surface area. The periodic variation in heating conditions allows for controlled crystal growth and particle形态 development, achieving the desired particle characteristics through cyclic thermal action.
2Object-generated harmful factors
If conventional thermal processes are used to produce graphenic carbon particles, then manufacturing simplicity is maintained, but oxygen content remains high
Solution Approach 1:
The patent employs inert or reducing atmospheres (such as nitrogen, argon, or hydrogen) during the thermal process to minimize oxidation of the carbon particles. This protective atmosphere prevents oxygen contamination while maintaining relatively simple process equipment, achieving low oxygen content particles without requiring complex purification systems.
Solution Approach 2:
The patent converts the potentially harmful effect of thermal processing (which can introduce oxygen) into a beneficial process by using controlled atmosphere thermal treatment. The thermal energy that could cause oxidation is instead harnessed to graphitize carbon while the inert atmosphere prevents harmful oxygen incorporation, turning a potential defect into a controlled synthesis process.
3Reliability
If particles with higher aspect ratio and surface area are produced, then dispersion and conductivity improve, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements feedback control in the thermal process by monitoring particle formation in real-time and adjusting temperature, atmosphere flow rates, and residence time accordingly. This feedback mechanism ensures consistent production of particles with target aspect ratios and surface areas, maintaining manufacturing precision while achieving improved dispersion and conductivity properties.
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 efficacy of the particles is characterized by comprising one or more layers of one atom thick sheets of sp2-bonded carbon atoms that are densely packed in a honeycomb crystal lattice.
Implementation Method 1
The planar structure comprises sp2-bonded carbon atoms that are densely packed in a honeycomb crystal lattice
Data Source
AI summary
Graphenic carbon particles having controlled aspect ratios, surface areas, numbers of carbon atom layers, and Raman spectroscopy peak ratios are disclosed. The graphenic carbon particles may include three or more stacked carbon atom layers, and may have a Raman spectroscopy 2D/G peak ratio of at least 1:1. Adjacent carbon atom layers within each graphenic carbon particle may be slightly misaligned with respect to each other to form a turbostatic structure.