Nanomolybdenum oxide, or nanoscale tungsten trioxide (WO3), has a series of unique physical properties. Below is a detailed summary of these properties:
- Appearance and Color of Nanomolybdenum Oxide
Appearance of Nanomolybdenum Oxide: Nanomolybdenum oxide typically appears as a light yellow or yellow powder, a characteristic determined by its chemical composition and nanoscale size.
Color Change of Nanomolybdenum Oxide: Upon heating, its color may change from light to deep orange, but it can revert to its original color upon cooling.
- Particle Size and Specific Surface Area
Particle Size of Nanomolybdenum Oxide: The particle size of nanomolybdenum oxide is typically in the nanoscale range, such as 50-60 nm. The specific particle size depends on the preparation methods and conditions used.
Specific Surface Area of Nanomolybdenum Oxide: Due to the small size effect of nanoparticles, nanomolybdenum oxide has a large specific surface area, which contributes to its catalytic activity and other surface effects.
- Density and Melting Point
Density of Nanomolybdenum Oxide: The density of nanomolybdenum oxide is approximately 7.16 g/cm³, which is determined by its molecular structure and chemical composition.
Melting Point of Nanomolybdenum Oxide: It has a high melting point of 1473°C, allowing nanomolybdenum oxide to maintain a certain degree of stability even under high-temperature conditions.
- Optical Properties
Electromagnetic Wave Absorption of Nanomolybdenum Oxide: Nanomolybdenum oxide exhibits strong absorption of electromagnetic waves, particularly visible light and ultraviolet rays. This makes it widely applicable in fields such as solar energy absorption materials and photocatalysis.
- Other Physical Properties
Thermal Stability of Nanomolybdenum Oxide: Nanomolybdenum oxide may undergo phase transitions at high temperatures, but its chemical structure remains relatively stable under normal conditions.
Solubility of Nanomolybdenum Oxide: Although its solubility is mentioned in the chemical properties, from a physical properties perspective, nanomolybdenum oxide is insoluble in water and almost insoluble in any inorganic acid except hydrofluoric acid (HF). This property also influences its applications in different media.
The physical properties of nanomolybdenum oxide are closely related to factors such as particle size, morphology, and surface state. Therefore, strict control of these conditions is necessary during the preparation and application of nanomolybdenum oxide to achieve the desired physical properties.
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