Metal Oxide Nanoparticle Size Control via Aqueous Oxidation
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Solution Overview
Problem
Current methods lack a facile and effective way to produce well-defined, solid metal oxide nanoparticles with controllable particle size for various applications, such as electrode materials and catalysts.
Innovation Solution
A method involving the preparation of metal nanoparticles, followed by controlled oxidation using an aqueous agent to achieve desired particle sizes, where the contact time with the agent determines the final size of the metal oxide nanoparticles, resulting in solid, monodispersed nanoparticles with specific shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to synthesize metal oxide nanoparticles, then hollow or core@shell structures can be produced, but it is difficult to obtain well-defined solid metal oxide nanoparticles with controllable particle size
Solution Approach 1:
The patent changes the chemical environment parameters by using aqueous agents with different pH values and compositions to control the oxidation process. By adjusting parameters such as contact time, aqueous agent composition, and oxidation conditions, the method achieves precise control over particle size and morphology while maintaining ease of manufacture through simple one-pot synthesis procedures.
2Stability of the object's composition
If oxidation time is increased to achieve complete conversion to metal oxide, then solid metal oxide nanoparticles are formed, but particle size control becomes difficult
Solution Approach 1:
The patent employs periodic or controlled oxidation by using aqueous agents that provide gradual and sustained oxidation over time. The oxidation process is controlled through periodic contact or by using buffers that maintain stable pH conditions, allowing complete conversion to metal oxide while maintaining narrow particle size distribution through controlled reaction kinetics.
Solution Approach 2:
The method incorporates feedback control through pH buffering systems that automatically adjust the oxidation rate. The aqueous agents contain buffers that maintain constant pH conditions, providing negative feedback to prevent runaway oxidation and ensure uniform particle size distribution while achieving complete metal oxide conversion.
3Productivity
If strong oxidizing conditions are used to accelerate oxidation, then conversion rate increases, but particle aggregation and loss of monodispersity occur
Solution Approach 1:
The patent optimizes oxidation parameters by using mild aqueous oxidizing agents at controlled pH and temperature conditions. Instead of strong oxidizing conditions, the method uses physiological or near-physiological conditions that provide sufficient oxidation rate while preventing particle aggregation through controlled reaction kinetics and steric stabilization from the aqueous medium.
Solution Approach 2:
The aqueous environment acts as an inert medium that provides a controlled oxidation atmosphere. The water-based system prevents direct contact between particles that would lead to aggregation, while dissolved oxygen or mild oxidizing agents in the aqueous phase provide sufficient oxidation rate to achieve complete conversion while maintaining monodispersity.
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 production of well-defined, solid metal oxide nanoparticles with precise control over particle size, enhancing their utility in applications like CO2 conversion and chemical reactions, and enabling further processing into metal nanoparticles.
Implementation Method 1
contacting the plurality of metal nanoparticles with an aqueous agent to provide metal oxide nanoparticles
Data Source
AI summary
Methods for preparing solid metal oxide nanoparticles via controlled oxidation comprising preparing a plurality of metal nanoparticles, contacting the plurality of metal nanoparticles with an aqueous agent to provide metal oxide nanoparticles having a desired particle size, and removing the resulting metal oxide nanoparticles from the aqueous agent. Aspects of the present disclosure also relate to solid metal oxide nanoparticles obtained by this method.