The chemical composition of tungsten oxide nanoparticles is mainly based on the elements tungsten (W) and oxygen (O), which form a variety of oxide forms. Depending on the number of oxygen atoms, tungsten oxide nanoparticles can be subdivided into various types, including but not limited to the following:
Tungsten trioxide (WO3)
This is one of the most common forms of tungsten oxide nanoparticles and is also known as yellow tungsten.
It is pale yellow in color at room temperature, has a density of about 7.2-7.4 g/cm³, a melting point of about 1470°C, and a boiling point between 1700-2000°C. WO3 is slightly soluble in water (0.2 g/L) but insoluble in all inorganic acids except hydrofluoric acid.
Non-stoichiometric tungsten oxides (e.g. WO2.9, WO2.72)
These are forms of tungsten oxide with slightly fewer oxygen atoms than tungsten trioxide.
For example, bluish tungsten (WO2.9) and violet tungsten (WO2.72) are representative of these, which appear blue and violet in color, respectively. These non-stoichiometric ratios of tungsten oxide usually have unique crystal structures and physicochemical properties.
Cesium-doped tungsten oxide (Cs0.33WO3)
Cesium-doped tungsten oxide is a special nano form of tungsten oxide in which the element cesium (Cs) has been doped. Cesium-doped tungsten oxide is mainly used in fields such as infrared absorbers and heat-insulating materials.
Characteristics of chemical composition of nano-tungsten oxide
Crystal structure
Nano tungsten oxide usually exists in crystal structure. Different types of tungsten oxide have different crystal structures and physicochemical properties.
Specific surface area
Due to their small size, tungsten oxide nanoparticles usually have a large specific surface area, which helps to enhance their physicochemical adsorption properties.
Application Areas
Due to its unique physicochemical properties, tungsten oxide nanoparticles have a wide range of application prospects in the fields of lithium battery anode materials, production of ultrafine tungsten powders and tungsten carbide powders, infrared absorbers and heat-insulating materials.
The chemical composition of tungsten oxide nanopowders is mainly based on the elements tungsten and oxygen, and many different types of tungsten oxide can be formed by adjusting the number of oxygen atoms. These different types of tungsten oxide nanoparticles are unique in their crystal structure, physicochemical properties and application areas.
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