Graphene Powder Coating for Organic Dispersion Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for modifying graphene to disperse it in organic systems are either expensive and complex or result in poor dispersion stability due to weak intermolecular interactions, leading to agglomeration issues.
Innovation Solution
A continuous method and equipment setup involving pre-emulsification, emulsion-polymerization, and spray drying processes to coat graphene oxide with oil-soluble polymer micro/nano particles through π-π conjugation and covalent binding, ensuring stable dispersion in organic systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If covalent modification method is used to bond graphene with modifier, then bonding strength is improved, but experimental instrument cost and process complexity increase
Solution Approach 1:
The patent uses oxygen-containing functional groups on graphene surface as intermediary sites for covalent bonding with modifiers. These functional groups act as natural anchoring points that facilitate strong covalent bonds without requiring complex external instrumentation, thus achieving strong bonding while simplifying the modification process
Solution Approach 2:
The graphene surface functional groups self-organize to provide covalent bonding sites, eliminating the need for complex external modification systems. The natural oxygen-containing groups on graphene spontaneously react with modifiers to form stable covalent bonds, reducing both instrument cost and process complexity
2Device complexity
If non-covalent modification method is used to bond graphene with modifier, then process complexity is reduced, but dispersion stability deteriorates due to weak interactions
Solution Approach 1:
The patent creates a composite structure where modifiers are covalently bonded to graphene functional groups, forming a stable composite material. This composite approach combines the simplicity of non-covalent methods with the stability of covalent bonding, achieving both low process complexity and high dispersion stability
Solution Approach 2:
The patent changes the bonding parameter from weak non-covalent interactions to strong covalent bonds by utilizing oxygen-containing functional groups on graphene. This parameter change transforms the interaction strength while maintaining process simplicity, resolving the contradiction between complexity and stability
3Adaptability or versatility
If graphene is dispersed in organic system using conventional methods, then dispersibility is improved, but agglomeration occurs leading to poor dispersion stability
Solution Approach 1:
The patent introduces oxygen-containing functional groups as intermediary bonding sites on graphene surface that mediate between graphene and organic modifiers. These functional groups enable stable covalent bonding with organic systems, preventing agglomeration while maintaining good dispersibility across various organic solvents and matrices
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 achieves stable and uniform dispersion of graphene powder in organic systems, preventing agglomeration and enabling high concentration use, with simple and efficient industrial-scale production capabilities.
Implementation Method 1
the ultrasonic probe is configured to emulsify the oil-soluble monomer into micro-nano droplets and promote adsorption of the micro-nano droplets on a surface of a graphene oxide sheet
Implementation Method 2
turning on the second mechanical stirring device and the heating device to heat the pre-emulsified dispersion to a first preset temperature under stirring
Implementation Method 3
feeding a reaction mixture after emulsion polymerization in the emulsion-polymerization kettle into the spray dryer through the feeding peristaltic pump, followed by drying at a third preset temperature to obtain the graphene powder
Implementation Method 4
a feeding peristaltic pump arranged in series on a pipeline between the emulsion-polymerization kettle and the spray dryer
Data Source
AI summary
A method for continuously preparing graphene powder directly dispersed in an organic system, including: mixing an aqueous graphene oxide dispersion, an emulsifier and an oil-soluble monomer followed by pH adjustment and dispersing to obtain a pre-emulsified dispersion; subjecting the pre-emulsified dispersion to an emulsion polymerization reaction in the presence of an initiator; introducing a reducing agent to reduce graphene oxide; and subjecting the reaction mixture after emulsion polymerization to spray drying to obtain the graphene powder. Equipment used in the preparation method is also provided herein.