Recently, the market for functional window films that suppresses an increase in indoor temperature and blocks ultraviolet rays due to abnormal climate phenomena such as global warming is rapidly growing. In particular, the smart window film is attracting much attention as a functional product for en...
Recently, the market for functional window films that suppresses an increase in indoor temperature and blocks ultraviolet rays due to abnormal climate phenomena such as global warming is rapidly growing. In particular, the smart window film is attracting much attention as a functional product for energy saving, and various studies are being conducted worldwide.
For the development of smart window films, electrochromic, thermochromic, and photochromic materials are used, but the performance and durability for commercialization are not up to the standard.
Metal oxides exhibit various properties depending on the type of metal, degree of oxidation, doping of dissimilar metals, and crystal phase, and various physical properties can be realized through their control. In particular, because of its excellent durability, many studies are being conducted as a substitute for organic materials. ZnO is mainly used as a white pigment and sunscreen. However, it was difficult to disperse and light scattering due to a high refractive index, so it could not be used as a sunscreen in areas requiring transparency. It was possible to improve visible light transmittance and improve visibility through surface modification of ZnO nanoparticles synthesized by the polyol method and optimization of dispersion mixing. VO2, known as a thermochromic material, is a thermochromic material that accompanies changes in phase transition and spectroscopic properties according to temperature. Since VO2 shows a reversible change in the infrared region, it has energy saving characteristics through infrared ray blocking. It was confirmed that the synthesis of VO2 microparticles was possible through synthesis using surfactants and reverse micelles, and it was confirmed that the phase transition temperature could be reduced by controlling the heat treatment temperature and making nanoparticles through optimal dispersion and mixing design. Lastly, WO3, a photochromic material, is a photochromic material that exhibits color-discoloration by oxidation-reduction by ultraviolet rays. WO3 has excellent energy-saving efficiency because it can simultaneously shield visible and infrared rays during coloring. Through this study, it was confirmed that the change of the crystal phase according to the increase of the heat treatment temperature was confirmed, and the width and speed of discoloration decreased according to the change of the crystal phase. In addition, it was confirmed that the photochromic properties were dramatically improved through the formation of the TiO2-WO3 nanocomposite.
Recently, the market for functional window films that suppresses an increase in indoor temperature and blocks ultraviolet rays due to abnormal climate phenomena such as global warming is rapidly growing. In particular, the smart window film is attracting much attention as a functional product for energy saving, and various studies are being conducted worldwide.
For the development of smart window films, electrochromic, thermochromic, and photochromic materials are used, but the performance and durability for commercialization are not up to the standard.
Metal oxides exhibit various properties depending on the type of metal, degree of oxidation, doping of dissimilar metals, and crystal phase, and various physical properties can be realized through their control. In particular, because of its excellent durability, many studies are being conducted as a substitute for organic materials. ZnO is mainly used as a white pigment and sunscreen. However, it was difficult to disperse and light scattering due to a high refractive index, so it could not be used as a sunscreen in areas requiring transparency. It was possible to improve visible light transmittance and improve visibility through surface modification of ZnO nanoparticles synthesized by the polyol method and optimization of dispersion mixing. VO2, known as a thermochromic material, is a thermochromic material that accompanies changes in phase transition and spectroscopic properties according to temperature. Since VO2 shows a reversible change in the infrared region, it has energy saving characteristics through infrared ray blocking. It was confirmed that the synthesis of VO2 microparticles was possible through synthesis using surfactants and reverse micelles, and it was confirmed that the phase transition temperature could be reduced by controlling the heat treatment temperature and making nanoparticles through optimal dispersion and mixing design. Lastly, WO3, a photochromic material, is a photochromic material that exhibits color-discoloration by oxidation-reduction by ultraviolet rays. WO3 has excellent energy-saving efficiency because it can simultaneously shield visible and infrared rays during coloring. Through this study, it was confirmed that the change of the crystal phase according to the increase of the heat treatment temperature was confirmed, and the width and speed of discoloration decreased according to the change of the crystal phase. In addition, it was confirmed that the photochromic properties were dramatically improved through the formation of the TiO2-WO3 nanocomposite.
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