Graphene Oxide Slurry Viscosity Reduction via Ultramicro-Refining
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Solution Overview
Problem
The low solid content of graphene oxide slurry limits the efficiency of coating and scalability in producing graphene heat-conducting films due to high viscosity, hindering large-scale production.
Innovation Solution
Ultramicro-refining of graphene oxide using high-pressure shearing and cavitation to reduce flake diameter, thereby decreasing viscosity and increasing solid content of the slurry, enhancing coating efficiency and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the solid content of graphene oxide slurry is increased, then the coating efficiency and productivity are improved, but the viscosity of the slurry increases, making it difficult to coat
Solution Approach 1:
The graphene oxide flakes are segmented into smaller sizes (reducing flake diameter) through ultrasonic treatment and high-shear mixing. This segmentation reduces the overall viscosity of the slurry while maintaining high solid content, resolving the contradiction between productivity and viscosity.
Solution Approach 2:
The patent changes physical parameters of the slurry including flake diameter reduction and viscosity control through mechanical treatment. By adjusting these parameters, the slurry achieves both high solid content (improving productivity) and manageable viscosity (improving coatability).
2Force
If the flake diameter of graphene oxide is reduced, then the viscosity of slurry is reduced and solid content is increased, but additional processing steps are required
Solution Approach 1:
The graphene oxide undergoes preliminary ultrasonic treatment and high-shear mixing during the slurry preparation stage to reduce flake diameter before coating. This preliminary action ensures the slurry has optimal viscosity and solid content characteristics before the coating process, avoiding the need for additional processing steps later.
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 increases the solid content of the graphene oxide slurry to 5-10%, improving coating efficiency by up to 300%, reducing preparation time and cost, and ensuring uniformity and performance of the graphene heat-conducting film.
Implementation Method 1
ultramicro-refining graphene oxide by high-pressure shearing, high-speed impacting and a strong cavitation action to reduce a flake diameter of graphene oxide
Implementation Method 2
ultramicro-refining graphene oxide by high-pressure shearing, high-speed impacting and a strong cavitation action to reduce a flake diameter of graphene oxide
Data Source
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AI summary
Provided are a low-viscosity graphene oxide slurry and a preparation method thereof, a graphene oxide film and a preparation method thereof, and a graphene heat-conducting film and a preparation method thereof. A main method used comprises ultramicro-refining graphene oxide under high-pressure shearing, high-speed impacting and a strong cavitation action to reduce a flake diameter of the graphene oxide, thereby reducing a viscosity of the graphene oxide slurry and increasing a solid content of the graphene oxide slurry, so that an efficiency of coating the graphene oxide slurry into the graphene oxide film is improved.