Copper Oxide Fine Particles Coated with Monovalent Copper for Deodorization
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Solution Overview
Problem
Nano-sized copper oxide fine particles with high surface activity tend to aggregate, making it difficult to achieve a deodorizing effect due to their size and surface properties.
Innovation Solution
Coating copper oxide fine particles with a monovalent copper compound and an organic layer derived from acetic acid or acetate, controlling the specific surface area, primary and secondary particle diameters, and zeta potential to enhance dispersibility and deodorizing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If copper oxide fine particles are reduced to nano-sized (100 nm or less) to increase surface area and surface activity, then the deodorizing potential is improved, but the particles tend to aggregate and overgrow, reducing their effectiveness
Solution Approach 1:
A coating layer containing monovalent copper compound is introduced as an intermediary substance between the copper oxide fine particles and the environment. This coating layer prevents direct interaction that would cause aggregation, while still allowing the particles to maintain their nano-sized structure and high surface area for deodorizing activity.
Solution Approach 2:
The invention creates a composite structure where copper oxide fine particles are combined with a coating layer containing monovalent copper compound. This composite material maintains the high surface area benefits of nano-sized particles while the coating layer provides steric or electrostatic stabilization to prevent aggregation, resolving the contradiction between surface area and dispersion stability.
2Reliability
If copper oxide fine particles are made smaller to enhance surface activity, then the potential deodorizing effect is improved, but the particles become more prone to aggregation due to size effects
Solution Approach 1:
The coating layer containing monovalent copper compound serves as a mediator that reduces the harmful aggregation tendency of ultra-fine particles. It maintains particle separation while allowing the core copper oxide particles to retain their high surface activity and deodorizing reliability.
Solution Approach 2:
The invention changes the chemical composition parameter of the particle surface by coating with monovalent copper compound. This parameter change modifies the surface properties to reduce aggregation tendency while preserving the deodorizing function, thus improving reliability without the harmful aggregation effect.
3Reliability
If multiple coating layers are applied to copper oxide particles to prevent aggregation and enhance deodorizing effect, then the particle stability and performance are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The coating layer containing monovalent copper compound performs multiple functions simultaneously: it prevents aggregation of particles, maintains nano-sized structure, and enhances deodorizing effect. This multi-functionality reduces the need for multiple separate coating steps, simplifying the manufacturing process while achieving high particle 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
The coated fine particles exhibit excellent deodorizing effects while preventing aggregation, leading to a stable dispersion liquid that effectively removes odorants.
Implementation Method 1
a surface of a copper oxide fine particle (a) is coated with a coating layer (b) containing a monovalent copper compound
Implementation Method 2
a dispersion liquid which is formed by dispersing the fine particle according to any one of <1> to <5> in a dispersion medium
Data Source
AI summary
A fine particle in which a surface of a copper oxide fine particle (a) is coated with a coating layer (b) containing a monovalent copper compound, in which the fine particle has a specific surface area of 100 m2/g or greater, an average primary particle diameter in a range of 5 to 20 nm, and an average secondary particle diameter in a range of 5 to 50 nm, is provided.