Graphene Silver Composite Material Uniform Dispersion
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Solution Overview
Problem
Conventional methods for preparing graphene/silver composite materials face challenges such as low mechanical properties of silver, decreased conductivity with enhanced phases, complex synthetic steps, use of toxic reducing agents, and poor controllability, which hinder the development of high-performance materials with eco-friendly and cost-effective production.
Innovation Solution
A method involving chemical synthesis, powder metallurgy, and rolling techniques is used to prepare graphene/silver composite materials, where silver nitrate and a non-toxic reduction agent are added to a graphene oxide solution, forming a graphene oxide/silver suspension, which is then reduced and molded using powder metallurgy and hot-extruding to achieve uniform dispersion and high performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional enhanced phases (metal oxides) are combined with silver to improve mechanical properties, then hardness and strength are improved, but electrical conductivity is decreased
Solution Approach 1:
The patent changes the phase composition parameter from conventional metal oxides to graphene, which has unique electrical properties. Graphene's two-dimensional structure and high electron mobility allow it to enhance mechanical properties while maintaining or even improving electrical conductivity compared to traditional metal oxide reinforcements
Solution Approach 2:
The patent creates a silver-graphene composite material that combines the high electrical conductivity of silver with the exceptional mechanical strength and electrical properties of graphene, achieving a synergistic effect where both conductivity and mechanical properties are improved simultaneously
2Manufacturing precision
If vacuum melting method is used to prepare graphene/silver composite material, then density and uniformity are improved, but graphene structure is damaged due to high temperature
Solution Approach 1:
The patent performs preliminary action by pre-dispersing graphene in the silver matrix before final consolidation. The graphene is uniformly distributed in the molten silver and then rapidly cooled to preserve the structure, avoiding the need for high-temperature treatment that would damage graphene
Solution Approach 2:
The patent utilizes phase transition of silver from solid to liquid state during processing, allowing graphene to be uniformly distributed in the molten state, then rapidly cooled to freeze the uniform distribution while preserving graphene structure through quick solidification
3Manufacturing precision
If complex synthetic steps and toxic reducing agents are used to prepare graphene/silver composite, then nanoparticle formation is achieved, but environmental friendliness and process simplicity are worsened
Solution Approach 1:
The patent replaces expensive and toxic reducing agents with inexpensive, environmentally friendly alternatives such as sodium citrate or ascorbic acid. These benign reducing agents achieve the same nanoparticle formation function without the harmful environmental effects, making the process both simpler and greener
Solution Approach 2:
The patent employs a self-service approach where the reducing agent simultaneously performs multiple functions: reducing silver ions to nanoparticles, stabilizing the nanoparticles to prevent aggregation, and capping the particle surfaces. This multi-functionality eliminates the need for separate stabilization steps and toxic additives
4Manufacturing precision
If chemical reduction method is used with hydrazine hydrate, then silver nanoparticle formation is achieved, but environmental protection requirements are not met
Solution Approach 1:
The patent substitutes hazardous hydrazine hydrate with inexpensive, non-toxic reducing agents like sodium citrate or ascorbic acid. These green alternatives achieve comparable nanoparticle size control and distribution without the environmental and safety hazards of hydrazine, meeting both precision and environmental protection requirements
Solution Approach 2:
The patent converts the potential harm of using strong reducing agents into a benefit by selecting mild, environmentally friendly reducing agents that are sufficient for the application. The slight reduction in reducing power is compensated by optimizing reaction conditions, turning a limitation into an environmental advantage
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 results in graphene/silver composite materials with high density, electrical conductivity, hardness, tensile strength, and elongation, with a uniform structure and stable performance, suitable for large-scale production and various applications.
Implementation Method 1
silver nitrate and a non-toxic reduction agent are added to a graphene oxide solution, forming a graphene oxide/silver suspension
Implementation Method 2
graphene/silver composite powder is then obtained through drying and reduction
Implementation Method 3
molding and sintering the graphene/silver composite powder obtained in the step 4) by powder metallurgy techniques
Data Source
Figure 1
AI summary
A method for preparing graphene/silver composite material is provided. A reduction agent and silver nitrate are added successively into a graphene oxide solution; silver powder obtained by reduction is directly combined with graphene oxide in the solution, so as to preliminarily obtain graphene oxide/silver composite powder; graphene/silver composite powder is then obtained through drying and reducing; a graphene/silver composite block material, a graphene/silver composite wire material and a graphene/silver composite belt material are able to be obtained by powder metallurgy, hot-extruding and rolling techniques. According to the composite material of the present invention, graphene is dispersed uniformly, and interface bonding between a matrix and an enhanced body is sufficient, leading to excellent physical performance of the composite material. Meanwhile, the method of the present invention is simple and processes are easy to control, which is conducive to large-scale production and application.