As a new dingal material, Cs doped tungsten oxide nanoparticles are excellent in shielding near infrared light and transmitting visible light, thereby play a role of heat insulation without affecting your view of the outside scenery. And such a new dingal material with novel optical properties is popular for potential use in automobile, architectural and other decorative fields. You know, research on dingal films has been attracting widespread attention recently. According to the research, an optical film with high visible reflection and a strong near infrared shielding efficiency can be prepared by a simple wet chemical method.
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In this process, emulsion polymerization was first introduced to synthesize polymer opals, which were further compressed between two pieces of PET films under polymer melting temperature to obtain a photonic crystal film with a strong reflection in the visible region to block blue rays. Then, coat a layer of inorganic nano coating synthesized by dispersing Cs doped tungsten oxide nanoparticles homogenously into organic resin on the surface of the PET to achieve a high near infrared shielding ability. The final composite film exhibited unique optical properties such as high visible reflectance (23.9%) to block blue rays, and excellent near infrared shielding efficiency (98.0%), meanwhile it still maintained a high transparency meaning that this film could potentially be applied in energy-saving window.
