Copper Nanoparticle Synthesis via Surfactant Stabilization
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Solution Overview
Problem
Current methods for producing copper nanoparticles are inadequate in achieving monodisperse, small-diameter particles with irregular shapes and wide size distributions, and lack scalability and cost-effectiveness.
Innovation Solution
A method involving the use of N,N'-dialkylethylenediamine and C6-C18 alkylamine as surfactants in a controlled heating process to produce copper nanoparticles with diameters between 1-10 nm, allowing for scalable and cost-effective production of monodisperse copper nanoparticles by adding a copper salt solution to a reducing agent solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chemical reduction methods are used to produce copper nanoparticles, then particles can be formed in solution, but the particles have irregular shapes and wide size distributions
Solution Approach 1:
The patent changes the physical state parameter from liquid solution to supercritical fluid, and adjusts temperature and pressure parameters to achieve monodisperse particles with narrow size distribution while maintaining ease of manufacture through a scalable process
2Manufacturing precision
If thermal CVD route is used to produce copper nanoparticles, then smaller nanoparticles of about 7.5 nm can be obtained, but the method is not conducive to scale up
Solution Approach 1:
The patent changes the fundamental process parameters by using supercritical fluid conditions instead of thermal CVD, enabling both precise particle size control (1-10 nm) and scalability through continuous flow processing and easy scale-up of supercritical fluid reactors
Solution Approach 2:
The patent replaces the thermal decomposition mechanism of CVD with a chemical reduction mechanism in supercritical fluid, allowing for better control over particle nucleation and growth while enabling scalable production through continuous processing
3Manufacturing precision
If conventional reducing systems are used, then particles can be produced, but agglomeration occurs and monodispersity is not achieved
Solution Approach 1:
The patent uses supercritical carbon dioxide as an inert supercritical fluid medium that prevents particle agglomeration and oxidation, providing a stable environment for producing monodisperse copper nanoparticles with uniform size distribution
Solution Approach 2:
The patent introduces surfactants as intermediary agents in the supercritical fluid system that stabilize the copper nanoparticles during formation and prevent agglomeration, ensuring monodispersity and colloidal stability
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
This method provides monodisperse copper nanoparticles with diameters as small as 5 nm, preventing agglomeration and enabling controlled particle size, which can be used in various applications including electronics, catalytic processes, and displays unique optical and electrical properties.
Implementation Method 1
Chemical reduction methods in solution and in reverse micelles have provided inadequate results
Implementation Method 2
heating a copper salt solution comprising a copper salt, an N,N'-dialkylethylenediamine, and a C6-C18 alkylamine in an organic solvent to a temperature between about 30 °C to about 50 °C
Data Source
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AI summary
A method of fabricating copper nanoparticles includes heating a copper salt solution that includes a copper salt, an N,N'-dialkylethylenediamine, and a C6-C18 alkylamine in an organic solvent to a temperature between about 30°C to about 50°C; heating a reducing agent solution that includes a reducing agent, an N,N'-dialkylethylenediamine, and a C6-C18 alkylamine in an organic solvent to a temperature between about 30°C to about 50°C; and adding the heated copper salt solution to the heated reducing agent solution, thereby producing copper nanoparticles. A composition includes copper nanoparticles, a C6-C18 alkylamine and an N,N'-dialkylethylenediamine ligand. Such copper nanoparticles in this composition have a fusion temperature between about 100°C to about 200°C. A surfactant system for the stabilizing copper nanoparticles includes an N,N'-dialkylethylenediamine and a C6-C18 alkylamine.