Near infrared reflective copper oxide coated particles
A copper oxide coated pigment including a particle having an outer surface, and a layer of copper oxide on the outer surface. The pigment has a reflectivity of electromagnetic radiation in a visible spectrum less than or equal to 5%, and a reflectivity of electromagnetic radiation in a near-IR and LiDAR spectrum greater than or equal to 5%. The particle is cobalt oxide or carbon black. A method for forming copper oxide coated particles includes combining a precipitating agent with a solution of copper nitrate and particles, forming coated particles. The particles are cobalt oxide or carbon black. Washing the particles, obtaining washed coated particles, and filtering the washed coated particles, obtaining filtered coated particles. Drying the filtered coated particles, obtaining dried coated particles, and calcining the dried coated particles to form the copper oxide coated particles.
1. A copper oxide coated pigment comprising:
a particle having an outer surface; and
a layer of copper oxide on the outer surface of the particle, wherein
the copper oxide coated pigment has a reflectivity of electromagnetic radiation in a visible spectrum that is less than or equal to 5%,
the copper oxide coated pigment has a reflectivity of electromagnetic radiation in a near-IR and LiDAR spectrum that is greater than or equal to 5%, and
wherein the particle is cobalt oxide (Co 3 O 4 ).
2. The copper oxide coated pigment of claim 1 , wherein the copper oxide coated pigment has a reflectivity of electromagnetic radiation in the visible spectrum that is less than or equal to 2%.
3. The copper oxide coated pigment of claim 1 , wherein the copper oxide coated pigment has a reflectivity for electromagnetic radiation in the near-IR and LiDAR spectrum that is greater than or equal to 20%.
4. The copper oxide coated pigment of claim 1 , wherein the copper oxide coated pigment has a reflectivity for electromagnetic radiation in the visible spectrum that is greater than or equal to 0.5% and less than or equal to 2%.
5. The copper oxide coated pigment of claim 1 , wherein the copper oxide coated pigment has a reflectivity for electromagnetic radiation in the near-IR and LiDAR spectrum that is greater than or equal to 10% and less than or equal to 65%.
6. The copper oxide coated pigment of claim 1 , wherein the copper oxide coated pigment has a blackness greater than or equal to 150 and less than or equal to 165.
7. A paint comprising:
a paint binder; and
at least one copper oxide coated pigment according to claim 1 .
8. The paint according to claim 7 , wherein the paint has a color with a lightness in CIELAB color space less than or equal to 40.
9. A vehicle comprising a body panel coated in the paint of claim 7 .