Mixed Graphene Oxide Slurry for High Carbon Heat-Conducting Films
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Solution Overview
Problem
The existing methods for preparing graphene heat-conducting films using graphene oxides result in a product with low carbon content per unit mass, increasing production costs and affecting the heat-conducting coefficient due to the difficulty in controlling the degree of oxidation and achieving a balanced assembly of graphene oxide layers.
Innovation Solution
A mixed slurry of strong and weak graphene oxides with different degrees of oxidation is used, where the strong graphene oxide provides good assembly orderliness and the weak graphene oxide increases carbon content, allowing for a higher residual carbon proportion in the final film, achieved by dispersing and neutralizing the oxides separately before mixing to prevent agglomeration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If strong graphene oxide with high degree of oxidation is used, then assembly orderliness and film formation are improved, but carbon content per unit mass decreases
Solution Approach 1:
The patent combines strong graphene oxide (high oxidation degree, good assembly) and weak graphene oxide (low oxidation degree, high carbon content) into a composite slurry system. This composite approach allows the final film to benefit from both the structural orderliness provided by strongly oxidized graphene oxide and the high carbon content provided by weakly oxidized graphene oxide, resolving the contradiction between assembly quality and carbon content.
Solution Approach 2:
The patent applies different degrees of oxidation to different components within the slurry system. Strong graphene oxide particles provide local areas of excellent assembly and orientation, while weak graphene oxide particles contribute local areas of high carbon content. This local differentiation allows each component to excel at its specific function while contributing to the overall film performance.
2Quantity of substance
If weak graphene oxide with low degree of oxidation is used, then carbon content increases, but assembly orderliness and film quality deteriorate
Solution Approach 1:
The patent creates a composite slurry where weak graphene oxide (high carbon content) is combined with strong graphene oxide (good assembly properties). The strong graphene oxide acts as a structural template that guides assembly, while the weak graphene oxide fills in to maximize carbon content, thus resolving the contradiction between carbon quantity and assembly quality.
Solution Approach 2:
The strong graphene oxide serves as an intermediary that mediates the assembly process for the weak graphene oxide particles. The strongly oxidized particles with their abundant functional groups facilitate ordered arrangement, which then templates and guides the assembly of weakly oxidized particles, enabling high carbon content content while maintaining good film structure.
3Ease of manufacture
If single degree of oxidation is selected, then process control is simplified, but heat-conducting coefficient and residual graphene amount cannot be optimized simultaneously
Solution Approach 1:
The patent changes the oxidation degree parameter from a single fixed value to a distribution of values (strong and weak components). By controlling the ratio and characteristics of these different oxidation states, the patent optimizes both the heat-conducting coefficient (through good assembly from strong GO) and residual graphene amount (through high carbon content from weak GO), while maintaining relatively simple process control through standardized slurry preparation methods.
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 approach results in a graphene heat-conducting film with a high heat-conducting coefficient and increased carbon content, reducing production costs while maintaining film thickness and efficiency.
Implementation Method 1
dispersing a graphene oxide into a solvent to obtain a dispersion liquid of the graphene oxide
Implementation Method 2
neutralizing the dispersion liquid to obtain a mixed slurry of the strong and weak graphene oxides
Data Source
AI summary
Provided are a slurry of graphene oxides with different degrees of oxidation, a composite film of graphene oxides, and a graphene heat-conducting film. The slurry of the graphene oxides comprises the graphene oxides and a solvent, and the graphene oxides include a strong graphene oxide and a weak graphene oxide, wherein the slurry comprises two graphene oxides with different degrees of oxidation, which can increase a carbon content in the graphene oxide per unit mass, so that the finally obtained graphene heat-conducting film has more carbon.