Cerium Oxide Nanoparticle Transfer to Non-Polar Solvents
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Solution Overview
Problem
Conventional methods for producing cerium-containing oxide nanoparticles are costly and energy-intensive, and they face challenges in transferring these nanoparticles from an aqueous phase to a non-polar phase without losing colloidal stability, especially when used as fuel-borne combustion catalysts, which requires stability in low-polarity solvents at low temperatures.
Innovation Solution
A process involving the use of amphiphilic materials and glycol ether promoters to transfer cerium-containing oxide nanoparticles from an aqueous dispersion to a non-polar solvent system at low temperatures, facilitating phase separation and maintaining colloidal stability, thereby reducing process energy costs and simplifying equipment requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional aqueous precipitation methods are used to produce cerium-containing oxide nanoparticles, then high material throughput is achieved, but the process becomes costly and energy-intensive requiring multiple time-consuming steps
Solution Approach 1:
The invention extracts and eliminates the energy-intensive calcination step from the conventional process. By using ambient temperature aqueous chemistry that directly produces crystalline cerium-containing oxide nanoparticles with desired composition and size, the process removes the need for high-temperature heating (400-1000°C for several hours) while maintaining high material throughput.
Solution Approach 2:
The invention performs preliminary action by pre-forming the final crystalline oxide nanoparticles directly in aqueous solution at ambient temperature, rather than forming precursors that require subsequent calcination. The aqueous chemistry is designed to produce the final product structure directly, eliminating later high-energy processing steps.
2Productivity
If aqueous precipitation processes are used, then high material throughput is achieved, but the process becomes time-consuming and equipment-intensive
Solution Approach 1:
The invention extracts and eliminates multiple time-consuming steps from the conventional process including calcination (several hours at high temperature), grinding, milling, and classification. The direct aqueous synthesis produces nanoparticles with desired size and crystallinity in a single step, dramatically reducing total process time while maintaining high throughput.
Solution Approach 2:
The invention merges multiple separate process steps into a single aqueous synthesis step. Instead of separate steps for precursor formation, particle precipitation, isolation, washing, drying, calcination, and size adjustment, the process combines these functions into one ambient temperature aqueous reaction that directly yields the final nanoparticle product.
3Reliability
If cerium-containing oxide nanoparticles are transferred from aqueous phase to non-polar phase for fuel-borne catalyst applications, then colloidal stability in low-polarity solvents is achieved, but the transfer process is complex and time-consuming
Solution Approach 1:
The invention changes the surface parameters of the nanoparticles by controlling the aqueous synthesis conditions to produce particles with surface properties inherently suited for non-polar solvents. By adjusting pH, ionic strength, and composition during aqueous synthesis, the particles are formed with surface characteristics that enable direct compatibility with fuel-borne applications without complex post-synthesis modification or lengthy transfer procedures.
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 approach enables the production of stable cerium oxide nanoparticle dispersions in low-polarity solvents at reduced temperatures, enhancing colloidal stability and flow properties, and minimizing contamination and waste, thus improving manufacturing efficiency and safety.
Implementation Method 1
facilitating phase separation and maintaining colloidal stability
Implementation Method 2
A process involving the use of amphiphilic materials and glycol ether promoters to transfer cerium-containing oxide nanoparticles from an aqueous dispersion to a non-polar solvent system
Implementation Method 3
enables the production of stable cerium oxide nanoparticle dispersions in low-polarity solvents at reduced temperatures
Implementation Method 4
maintaining colloidal stability, thereby reducing process energy costs and simplifying equipment requirements
Data Source
AI summary
Improved methods for producing colloidal dispersions of cerium-containing oxide nanoparticles in substantially non-polar solvents are disclosed. The cerium-containing oxide nanoparticles of an aqueous colloid are transferred to a substantially non-polar liquid comprising one or more amphiphilic materials, one or more low-polarity solvents, and, optionally, one or more glycol ether promoter materials. The transfer is achieved by mixing the aqueous and substantially non-polar materials, forming an emulsion, followed by a phase separation into a remnant polar solution phase and a substantially non-polar organic colloid phase. The organic colloid phase is then collected.