Cerium oxide nanoparticle, dispersion solution, antiviral agent, antibacterial agent, resin composition, resin product, fiber material, fiber product, and method of producing cerium oxide nanoparticle
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Solution Overview
Problem
Conventional cerium oxide nanoparticles used as antibacterial and antiviral agents often exhibit undesirable coloring properties, limiting their application in dispersion solutions and combinations with resins or fibers, necessitating an improvement in their coloring characteristics while maintaining high antibacterial and antiviral activity.
Innovation Solution
The production of cerium oxide nanoparticles using a stabilizer such as a basic amino acid, alicyclic amine, aromatic heterocyclic compound, polymer with a heterocyclic amine skeleton, or boron compound, followed by hydrothermal treatment, results in nanoparticles with improved coloring properties, high antibacterial activity, and antiviral efficacy, characterized by specific XANES and XRD spectra, and a positive zeta potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional stabilizers (polyacrylic acid, dextran, basic amino acids, alicyclic amines, aromatic heterocyclic compounds) are used to prevent nanoparticle aggregation, then dispersion stability is improved, but coloring properties deteriorate (yellow, orange, or brown coloration)
Solution Approach 1:
The patent changes the chemical parameters of the stabilizer by selecting inorganic phosphates (orthophosphate, polyphosphate) instead of organic stabilizers. This parameter change fundamentally alters the interaction mechanism between stabilizer and nanoparticle surface, preventing coloration while maintaining dispersion stability through electrostatic repulsion and surface complexation.
Solution Approach 2:
The patent employs simple inorganic phosphate ions that can be easily introduced and removed from the system compared to complex organic stabilizers. These inorganic stabilizers provide effective steric and electrostatic stabilization without the side effect of coloration, making them preferable for applications where color neutrality is critical.
2Reliability
If basic amino acids or alicyclic amines are used as stabilizers, then zeta potential increases and oxidation performance improves, but the nanoparticle solution becomes colored (orange)
Solution Approach 1:
The patent changes the functional group parameter from nitrogen-containing basic groups (amino, amine) to phosphorus-containing inorganic phosphate groups. This parameter change maintains the ability to increase zeta potential and improve oxidation performance through surface complexation, while eliminating the orange coloration associated with nitrogen-based stabilizers.
3Reliability
If vinyl-based polymers with heterocyclic amine skeletons are used as stabilizers, then antiviral activity and oxidation performance improve, but the nanoparticle solution exhibits orange coloration
Solution Approach 1:
The patent replaces complex vinyl-based polymers with simple inorganic phosphate ions that can be easily introduced into the nanoparticle system. These inorganic stabilizers provide effective stabilization and maintain antiviral activity through surface charge modification, while eliminating the orange coloration and structural complexity of polymer-based stabilizers.
4Stability of the object's composition
If boric acid is used as a stabilizer, then particles are stably dispersed over wide pH range with negative charge, but the nanoparticle solution becomes colored (orange)
Solution Approach 1:
The patent changes the chemical composition parameter from boron-containing boric acid to phosphorus-containing inorganic phosphates. Both provide negative surface charge and pH stability, but inorganic phosphates eliminate the orange coloration while maintaining wide pH range stability through their pKa values and surface complexation behavior.
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 resulting nanoparticles have a low coloring property, with a Hazen color number of 400 or less, high antibacterial activity, and antiviral efficacy, making them suitable for use in various applications without the limitations of conventional cerium oxide nanoparticles.
Implementation Method 1
a method of allowing a stabilizer to coexist with the nanoparticle to thereby prevent aggregation of the nanoparticles and stably disperse the nanoparticles
Implementation Method 2
a particle dispersion solution is obtained by oxidizing a cerium (III) ion with hydrogen peroxide
Implementation Method 3
followed by hydrothermal treatment, results in nanoparticles with improved coloring properties
Data Source
AI summary
A cerium oxide nanoparticle includes a basic amino acid, an alicyclic amine, an aromatic heterocyclic compound containing a nitrogen atom in a ring structure of the aromatic heterocyclic compound, a polymer having a heterocyclic amine skeleton, or a boron compound, as a stabilizer, wherein an APHA of a 1 mass % dispersion solution is 400 or less.