Pyrophoric Iron Nanoparticle Production via Continuous Flow
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Solution Overview
Problem
Current methods for producing pyrophoric nanoparticles result in low yields and high costs due to the use of expensive metal oxalate salts, leading to inefficient and costly production of nanoparticles less than 50 nm in size, which are necessary for various thermal and catalytic applications.
Innovation Solution
A method involving a continuous process where a first aqueous solution of a metal salt and a functional polyether is combined with a second solution of a metal hydride reducing agent, such as sodium borohydride, to produce nanoparticles in a liquid phase, which are then separated and dried to form pyrophoric nanoparticles with diameters ranging from 1 nm to 50 nm, achieving yields greater than 30%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If metal oxalate salts are used to produce pyrophoric nanoparticles, then the nanoparticles can be produced with the required small size (less than 50 nm), but the production cost increases significantly and yield decreases to less than 30%
Solution Approach 1:
The patent changes the chemical parameters of the synthesis process by replacing metal oxalate salts with metal sulfate salts and using sodium borohydride as the reducing agent instead of traditional methods. This parameter change enables both high yield (greater than 30%) and small nanoparticle size (less than 50 nm) to be achieved simultaneously, resolving the contradiction between manufacturing precision and productivity
2Manufacturing precision
If metal oxalate salts are used to produce pyrophoric nanoparticles, then the nanoparticles can be produced with the required small size (less than 50 nm), but the material cost increases due to high trading prices of nickel and copper
Solution Approach 1:
The patent substitutes expensive metal oxalate salts with cheaper metal sulfate salts and uses readily available reducing agents like sodium borohydride. This replacement of expensive materials with cheaper alternatives maintains the ability to produce small nanoparticles (less than 50 nm) while significantly reducing material costs, addressing the contradiction between manufacturing precision and quantity of substance
3Ease of operation
If traditional batch processes are used to produce nanoparticles, then the process is simpler to operate, but the throughput and yield remain low
Solution Approach 1:
The patent transitions from batch processing to a continuous flow process where reactants are continuously pumped through a microreactor system. This continuous action enables high throughput and yield (greater than 30%) while maintaining operational simplicity through automated flow control and standardized reactor modules, resolving the contradiction between ease of operation and productivity
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 continuous process significantly increases throughput and yield, producing smaller, more uniform nanoparticles that are pyrophoric and can be used as oxygen scavengers or catalysts, reducing material costs and improving the efficiency of end products.
Implementation Method 1
providing a second solution comprising a metal hydride reducing agent selected from the group consisting of sodium borohydride, lithium aluminum hydride, diisobutylaluminum hydride, lithium triethylborohydride, and mixtures thereof; continuously combining the first and second solutions to produce iron nanoparticles in a liquid phase
Implementation Method 2
Pyrophoric nanoparticles can spontaneously ignite and burn when in contact with atmospheric oxygen. Such nanoparticles contain metals that can react with oxygen gas in the atmosphere to form metal oxides in a natural oxidation reaction. This natural oxidation reaction is a spontaneous exothermic process
Data Source
AI summary
Pyrophoric nanoparticles and methods of producing the same are provided herein. An exemplary method of producing pyrophoric nanoparticles can include providing a first aqueous solution comprising at least one metal salt and an aliphatic polyether; providing a second solution comprising a metal hydride reducing agent; continuously combining the first and second solutions to produce nanoparticles in a liquid phase; separating the nanoparticles from the liquid phase; and drying the nanoparticles to form pyrophoric nanoparticles. The pyrophoric nanoparticles can have a diameter ranging from about 1 nm to about 50 nm.