Patent ID: 8709306

Claim:
Thermochromic microparticles comprising: vanadium dioxide (VO 2 ) particles of a rutile crystal phase (R phase), and titanium dioxide (TiO 2 ) particles of the rutile crystal phase (R phase) being a seed crystal for growth of the vanadium dioxide (VO 2 ), wherein at least one of the vanadium dioxide (VO 2 ) particles of the rutile crystal phase (R phase) is grown as a rod-like particle on the titanium dioxide (TiO 2 ) particles, and the vanadium dioxide (VO 2 ) particles grown as the rod-like particle are about 1.5 to 5 times longer than the titanium dioxide (TiO 2 ) particles of the rutile crystal phase along growth axes of the vanadium dioxide (VO 2 ) particles.