Infrared radiation-absorbing material fine particle dispersion liquid and infrared radiation-absorbing material fine particle dispersion body

2:

• The infrared radiation-absorbing material fine particle dispersion liquid according to claim 1, wherein a particle size of the composite tungsten oxide fine particles is 1 nm or more and 200 nm or less.

3:

• The infrared radiation-absorbing material fine particle dispersion liquid according to claim 1, wherein a particle size of the iron oxide (Fe2O3) fine particles is 1 nm or more and 200 nm or less.

4:

• The infrared radiation-absorbing material fine particle dispersion liquid according to claim 1, wherein the liquid medium is one or a mixture of two or more selected from water, an organic solvent, a vegetable oil, a vegetable oil-derived compound, a petroleum-based solvent, an oil and/or fat, a liquid resin, and a liquid plasticizer for plastic.

5:

• The infrared radiation-absorbing material fine particle dispersion liquid according to claim 1, wherein when the infrared radiation-absorbing material fine particle dispersion liquid is evaluated in an L*a*b* color system, a* is −20 or more and 0 or less, and b* is −3.5 or more and 15 or less.

6:

• An infrared radiation-absorbing material fine particle dispersion body comprising infrared radiation-absorbing material fine particles and iron oxide (Fe2O3) fine particles in a solid medium, wherein
• the infrared radiation-absorbing material fine particles are formed of composite tungsten oxide fine particles which are represented by a general formula MYWOZ (where the element Mis one or more elements selected from H, He, alkali metals, alkaline earth metals, rare earth elements, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I, W is tungsten, O is oxygen, 0.001≤Y≤1.0, and 2.2≤Z≤3.0), and which have a hexagonal crystal structure, and
• a mass ratio between the iron oxide (Fe2O3) fine particles and the composite tungsten oxide fine particles in the solid medium [iron oxide (Fe2O3) fine particles/composite tungsten oxide fine particles] is 0.01 or more and 0.1 or less.

7:

• The infrared radiation-absorbing material fine particle dispersion body according to claim 6, wherein a particle size of the composite tungsten oxide fine particles is 1 nm or more and 200 nm or less.

8:

• The infrared radiation-absorbing material fine particle dispersion body according to claim 6, wherein a particle size of the iron oxide (Fe2O3) fine particles is 1 nm or more and 200 nm or less.

9:

• The infrared radiation-absorbing material fine particle dispersion body according to claim 6, wherein the solid medium is a resin or a metal alkoxide.

10:

• The infrared radiation-absorbing material fine particle dispersion body according to claim 6, wherein when the infrared radiation-absorbing material fine particle dispersion is evaluated in an L*a*b* color system, a* is −20 or more and 0 or less, and b* is −3.0 or more and 15 or less.