Heat storage fiber is a material science and technology term announced in 2011. Heat accumulating fiber is a functional fiber that can convert sunlight or infrared rays into heat energy and store it in the fiber.
Cesium tungsten bronze is not only an important raw material for transparent thermal insulation coatings, films or glass, but also an important raw material for the production of thermal storage fibers, which can greatly improve the comprehensive performance of functional fibers.
Heat storage fiber refers to the functional fiber that can convert sunlight or infrared rays into heat and store it in the fiber. It is an ideal application fabric for the elderly, athletes and outdoor workers. It is mainly used to make mountaineering clothing fabrics, warm socks, and troops in alpine regions. Clothing, heat storage and energy storage carpets and other woven and knitted textiles that require thermal insulation.
In order to further improve the comprehensive performance of existing heat storage fibers such as environmental protection and heat storage, researchers often add an appropriate amount of cesium tungsten nanomaterials such as cesium tungsten bronze nanomaterials in the production process.
Cesium tungsten bronze is a non-stoichiometric functional compound with a special structure of oxygen octahedron. The chemical formula is CsxWO3 (x is between 0 and 0.33), the purity is as high as 99.99%, the primary particle size is 50nm, and the band gap is wide. It has the characteristics of non-toxic, non-radioactive, strong near-infrared (wavelength 800-1200nm) absorption and high visible light transmittance, so it is suitable for the production of thermal storage fibers.
The main reason why the cesium tungsten bronze nanomaterial has a strong absorption capacity in the infrared region is that its structure has a cation embedded structure and oxygen vacancy defects, so there are many free charges in the Cs0.33WO3 material, and in the Cs0.33WO3 The surface of the nanoparticles produces a localized plasmon resonance effect.
Because cesium tungsten bronze nanoparticles have good selective transmittance to the spectrum, that is, the transmittance is high in the visible light wavelength range (380-780nm) and the transmittance is low in the near-infrared wavelength range, so it is suitable for use in Production of transparent thermal insulation films, which ensures high visual transparency and low near-infrared transmittance of the product.
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