Graphene Sheet Compression Process for Bulk Density
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Solution Overview
Problem
Graphene sheets have low bulk densities, making storage, packaging, and transportation cumbersome and costly, and attempts to increase bulk density can result in reduced surface area and dispersability.
Innovation Solution
A process involving thermal treatment of graphene-derived precursors followed by compression in a closed system using pressures of 5 to 1000 psi to increase bulk density without significantly affecting surface area or dispersability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If compression pressure is increased to increase bulk density, then bulk density is improved, but surface area and dispersability deteriorate
Solution Approach 1:
The patent applies parameter changes by controlling compression pressure within a specific range (5 to 1000 psi) and maintaining temperature below the graphite sublimation point. This optimized parameter combination increases bulk density while preventing excessive sheet stacking that would reduce surface area and dispersability.
2Quantity of substance
If compression pressure is increased to increase bulk density, then bulk density is improved, but dispersability deteriorates
Solution Approach 1:
The patent uses parameter changes by optimizing compression pressure (5 to 1000 psi) and temperature conditions to achieve increased bulk density while maintaining dispersability. The controlled parameters prevent complete restacking of graphene sheets, preserving their ability to disperse in matrices and binders.
3Area of stationary object
If thermal treatment is applied to produce graphene sheets, then surface area is improved, but bulk density deteriorates
Solution Approach 1:
The patent merges two processes: thermal treatment to produce high-surface-area graphene sheets, followed by controlled compression to increase bulk density. This combination achieves both high surface area (through thermal exfoliation) and high bulk density (through controlled compression), resolving the contradiction between the two 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 process effectively increases the bulk density of graphene sheets while maintaining their surface area and dispersability, making storage and handling more efficient and cost-effective.
Implementation Method 1
the graphene sheets are compressed in a compression apparatus with a pressure of about 5 to about 1000 psi
Implementation Method 2
The graphene sheets may be made by the thermal exfoliation of a graphite-derived precursor or by the thermal treatment (such as reduction, annealing, etc.) of existing graphene sheets
Data Source
AI summary
Processes for preparing or handling graphene sheets wherein low bulk density graphene sheets are compressed. The graphene sheets may be produced by a thermal treatment such as exfoliation of precursor or reduction or annealing of previously existing graphene sheets and conveyed in a closed system to a compression apparatus.