Thermochromic materials and preparation method
The disclosure pertains to thermochromic materials, coatings, to coated articles and to preparation methods. In addition, the disclosure relates to thermochromic particulate material comprising vanadium (IV) oxide. A described preparation method involves curing of the coating using two curing stages performed with different oxygen levels.
1 . A thermochromic particulate material comprising vanadium (IV) oxide and one or more doping ions, wherein the thermochromic particulate material exhibits a SSF particulate =ΔH/ΔT switch >2.5, with a T switch,H <50° C. and an average particle size ranging between 10-500 nm, wherein ΔH is the switching enthalpy and ΔT switch =T switch,H −T switch,C , wherein T switch,H and T switch,C are the switching temperature upon heating and cooling, respectively.
2 . A composition comprising a matrix and the thermochromic particulate material according to claim 1 .
3 . An article comprising the composition according to claim 2 , wherein the article is a film.
4 . The article according to claim 3 , wherein the matrix is a polymer matrix or a sol-gel matrix.