The color of tungsten oxide (WO3) changes significantly under different environments, and these changes are mainly affected by a variety of factors, such as light, temperature, humidity and chemical reactions. The following is a detailed analysis of how these factors affect the color of tungsten oxide:
- Influence of light
Prolonged exposure to light
Experiments show that prolonged exposure to light will cause the color of tungsten oxide to change. Under the irradiation of light, the color of tungsten oxide may become gray-brown or dark brown (Source: Baidu Ai purchasing). This may be due to the fact that some molecules of substances in tungsten oxide have changed under the action of light, making the nature and color of the substances change. In addition, light may also cause changes in the adsorbed gases on the surface of tungsten oxide, which in turn causes changes in the surface charge of the substance, ultimately affecting the color (Source: Baidu Ai Sourcing).
Specific light conditions
The color of blue tungsten oxide (WO2.9) is affected by light. Under the sunlight, it will become light blue; while in the dark room, it will slowly turn into its original color (Source: tungsten news, tungsten price, tungsten market, the most professional and latest tungsten information platform).
- Temperature Influence
Heating
The color of tungsten oxide changes when it is heated. For example, under normal conditions, tungsten oxide is light yellow or white, but the color will deepen when heated and return to light yellow after cooling (Source: ChemicalBook). In addition, when tungsten is heated in air, it will gradually oxidize to yellow tungsten trioxide (WO3), and the color may deepen further as the oxidation intensifies with higher heating temperatures (Source: ChemicalBook).
Third, the effect of humidity
Air humidity
When the air humidity is high, even at room temperature, tungsten powder will be gradually oxidized, covering a layer of bluish-purple intermediate oxidized film on its surface (Source: Hundred). This indicates that humidity also has a certain effect on the color change of tungsten oxide.
- Chemical Reaction
Reduction reaction
Tungsten oxide can be transformed into other tungsten compounds through chemical reduction reaction, and these compounds will show different colors. For example, when tungsten oxide is reduced to tungsten oxide (WO2), it will show a bluish-gray color; when it is reduced to tungsten metal (W), it will become a silvery-white color (Source: Baidu Ai purchasing).
The color change of tungsten oxide is a complex process that is affected by a combination of factors such as light, temperature, humidity, and chemical reactions. These factors change the crystal structure, electronic state and surface properties of tungsten oxide, which in turn cause its color change. In practical application, the influence of these factors on the color stability of tungsten oxide needs to be fully considered to ensure its use in specific environments.
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