Metal Double Salt Dispersion for Stable, Fine Oxide Nanoparticles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for producing metal oxide nanoparticles result in large particle sizes and poor solvent dispersibility, and the dispersibility of zinc oxide nanoparticles decreases over time.
Innovation Solution
A metal double salt dispersion liquid is produced by reacting a metal carboxylate with a strong base in an organic solvent, followed by heating in the presence of water, to form metal oxide nanoparticles with high dispersibility and stability, using a composition represented by M(R1COO)m-x-y(OH)x(A)y(H2O)z, where M is a metal element, and the process includes specific ratios of strong base to metal carboxylate and controlled heating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If metal hydroxide or metal hydrate is formed by adding aqueous solutions of metal salt and neutralizing agent to carboxylic acid compound, then metal oxide particles can be produced, but the particle size becomes large and dispersibility in solvent deteriorates due to required firing
Solution Approach 1:
The invention changes the chemical parameters by using a specific base (ammonia, amine, or carbazole) instead of conventional neutralizing agents, and controls the reaction conditions (temperature, base amount) to produce metal hydroxide/hydrate particles with optimal size and surface properties that enable good dispersibility without firing
Solution Approach 2:
The invention introduces a base (ammonia, amine, or carbazole) as an intermediary substance that mediates the reaction between metal salt and carboxylic acid compound, forming metal hydroxide/hydrate particles with controlled characteristics that achieve both small particle size and good dispersibility
2Ease of manufacture
If zinc oxide nanoparticles are produced by adding aqueous solution of base to metal salt dispersion liquid, then high dispersibility is achieved immediately after production, but dispersibility decreases with the lapse of time
Solution Approach 1:
The invention changes the chemical composition parameters by using specific bases (ammonia, amine, or carbazole) with controlled amounts (0.4m to 0.9m times the metal carboxylate amount), which produces metal oxide nanoparticles with improved temporal stability of dispersibility
Solution Approach 2:
The invention ensures continuous stability of dispersibility by controlling the reaction to form nanoparticles with surface properties that maintain dispersion over time, preventing aggregation and preserving the useful action of dispersibility throughout the product's usage period
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 method produces metal oxide nanoparticles with small particle sizes and high dispersibility, maintaining stability over time without the need for firing, and can be used to form thin films or combine with base materials.
Implementation Method 1
reacting a metal carboxylate with a strong base in an organic solvent, followed by heating in the presence of water, to form metal oxide nanoparticles
Implementation Method 2
heating in the presence of water, to form metal oxide nanoparticles
Implementation Method 3
heating in the presence of water, to form metal oxide nanoparticles with high dispersibility and stability
Data Source
Figure 1~3
Figure 4~5
AI summary
The present invention is a metal double salt dispersion liquid including an organic solvent and a metal double salt, wherein the metal double salt has a composition represented by M(R1COO)m-x-y(OH)xAy(H2O)z, where M is a metal element, R1 is a hydrogen atom or an alkyl group, A is an anion, m is a valence of the metal element M, and 0 < x + y <m, x > 0, y ≥ 0, and z ≥ 0 are satisfied, and when the metal double salt dispersion liquid is subjected to a centrifugal operation at a relative centrifugal force of 10,000 G for 5 minutes, a proportion of metal elements not forming a precipitate to all metal elements contained in a total of the metal double salt dispersion liquid is 10.0 mol% or more.