Composite Nanoparticles via Electrochemical Synthesis
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Solution Overview
Problem
The synthesis of sub-10 nm sized hard magnetic phase nanoparticles is hindered by the inability to optimize grain boundaries for spring coupling between soft and hard phase magnetic materials, necessitating a reliable method to tune nanoparticle size and achieve desirable magnetic properties for nanocomposite permanent magnets.
Innovation Solution
A modular electrochemical process is developed to fabricate composite nanoparticles with adjustable stoichiometry, using a complexing ligand to adhere metals and rare earth elements, enabling the formation of core-shell structures and various stoichiometric ratios, such as SmCo5, Sm2Co7, and Sm5Co19, through controlled application of electric current and voltage in an electrochemical cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional synthesis methods are used to produce hard magnetic phase nanoparticles, then larger particle sizes can be achieved, but the ability to optimize grain boundaries for spring coupling and tune nanoparticle size is lost
Solution Approach 1:
The patent applies parameter changes by systematically varying synthesis conditions including precursor ratios, reaction temperature, pH, and surfactant concentrations to achieve precise control over nanoparticle size and stoichiometry. This enables the production of sub-10 nm particles with specific compositions (e.g., SmCo5, Sm2Co17) while maintaining manufacturability through optimized synthesis protocols
Solution Approach 2:
The patent uses surfactants and complexing agents as intermediaries to control nanoparticle formation. These intermediaries mediate the synthesis process by controlling precursor assembly, regulating particle growth, and stabilizing nanoparticles at critical sub-10 nm sizes, thereby enabling precise size control while simplifying the overall synthesis approach
2Reliability
If nanoparticle size is reduced to sub-10 nm for spring coupling optimization, then magnetic properties improve, but the complexity of achieving desired stoichiometry increases
Solution Approach 1:
The patent segments the synthesis process into distinct stages: precursor preparation, controlled assembly guided by surfactants, and staged thermal treatment. This segmentation allows independent optimization of each step, enabling precise control over final nanoparticle stoichiometry and size while reducing overall process complexity
Solution Approach 2:
The patent employs universal complexing agents and surfactants that can control the formation of multiple different rare earth transition metal nanoparticle compositions (SmCo5, Sm2Co17, etc.) using a single synthesized approach. This multi-functionality reduces the complexity of achieving desired stoichiometry by applying the same general methodology across different compositional targets
3Adaptability or versatility
If electrochemical synthesis is used to achieve modular process with adjustable stoichiometry, then manufacturing flexibility improves, but process complexity increases
Solution Approach 1:
The patent implements dynamics by making the electrochemical synthesis process continuously adjustable through variable parameters including current density, voltage, electrolyte composition, and reaction time. This dynamic control enables real-time adjustment of nanoparticle stoichiometry and size, providing manufacturing flexibility while the modular cell design keeps operational complexity manageable
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 allows for the precise control of nanoparticle size, shape, and stoichiometry, enhancing the magnetic properties of nanocomposite permanent magnets by achieving smaller particle sizes and specific elemental distributions, thereby improving coercivity and energy product values.
Implementation Method 1
The complexing ligand possesses a property of adhering to the metal and to the rare earth element, thus complexing the metal with the rare earth element
Implementation Method 2
applying an electric current to the first sacrificial anode and to the cathode, wherein the first sacrificial anode is a metal anode or a rare earth element anode
Implementation Method 3
applying an electric current to the second sacrificial anode and to the cathode, wherein the second sacrificial anode is a metal anode or a rare earth element anode
Data Source
AI summary
The present invention is directed to composite nanoparticles comprising a metal, a rare earth element, and, optionally, a complexing ligand. The invention is also directed to composite nanoparticles having a core-shell structure and to processes for preparation of composite nanoparticles of the invention.