Cerium oxide nanoparticle, dispersion solution, antiviral agent, antibacterial agent, resin composition, resin product, fiber material, fiber product, and method of producing cerium oxide nanoparticle

A cerium oxide nanoparticle comprising 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.

A cerium oxide nanoparticle comprising 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 the cerium oxide nanoparticle has a maximum absorption of more than 5,729 eV and 5,731 eV or less and 5,735 to 5,739 eV in a Ce L3 edge XANES spectrum obtained by measurement of an X-ray absorption fine structure spectrum, and has a molar ratio of Ce4+ to Ce3+ of 40:60 to 100:0.

A cerium oxide nanoparticle comprising 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 the cerium oxide nanoparticle has diffraction peaks at Bragg angles (2θ) of 27° to 29°, 31° to 33°, 46° to 48°, and 55° to 57° in an XRD spectrum, and has a peak intensity ratio of a peak intensity at 27° to 29° to a peak intensity at 46° to 48° of 1.8 or less.

A method of producing a cerium oxide nanoparticle, comprising:

• step a) adding an oxidizing agent to a solution containing 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, and a cerium (III) ion;
• and
• step b) subjecting a solution obtained in step a) to a hydrothermal treatment.