Thermochromic microparticles, dispersions thereof, and manufacturing method thereof, as well as light-modulating coatings, light-modulating films and light-modulating inks
AssigneeNational Institute of Advanced Industrial Science and Technology
InventorsPing Jin, Shidong Ji, Masato Tazawa
Life of this patent
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Abstract
Thermochromic microparticles including vanadium dioxide (VO2) particles of a rutile crystal phase (R phase), and titanium dioxide (TiO2) particles of the rutile crystal phase (R phase), wherein at least one of the vanadium dioxide (VO2) particles of a rutile crystal phase (R phase) is grown like a rod on the titanium dioxide (TiO2) particles to be larger than sizes of the titanium dioxide (TiO2) particles.
Claims28
Thermochromic microparticles comprising:
- vanadium dioxide (VO2) particles of a rutile crystal phase (R phase), and
- titanium dioxide (TiO2) particles of the rutile crystal phase (R phase),
- wherein at least one of the vanadium dioxide (VO2) particles of a rutile crystal phase (R phase) is grown like a rod on the titanium dioxide (TiO2) particles to be larger than sizes of the titanium dioxide (TiO2) particles.
A manufacturing method of microparticles containing vanadium dioxide (VO2) particles of a R phase, comprising:
- (1) a step of preparing a solution containing a compound including vanadium and water;
- (2) a step of preparing a suspended solution by adding titanium dioxide (TiO2) particles, at least a part of which is in a rutile crystal phase, to the solution;
- and
- (3) a step of obtaining microparticles including vanadium dioxide (VO2) particles of the R phase by causing the suspended solution to undergo a hydrothermal reaction.
A manufacturing method of thermochromic microparticles containing vanadium dioxide (VO2) particles of a R phase and titanium dioxide (TiO2) particles of the R phase comprising:
- (1) a step of preparing a solution containing a compound including vanadium and water;
- (2) a step of preparing a suspended solution by adding titanium dioxide (TiO2) particles, at least a part of which is in the rutile crystal phase, to the solution;
- and
- (3) a step of causing the suspended solution to undergo a hydrothermal reaction,
- wherein the thermochromic microparticles are obtainable, at least one of the vanadium dioxide (VO2) particles larger than the titanium dioxide (TiO2) particles grows on the titanium dioxide (TiO2) particles, and a crystal axis of the at least one of the vanadium dioxide (VO2) particles and a crystal axis of the titanium dioxide (TiO2) match.
Dependencies are inferred from the claim text.