The average particle size of ammonium metatungstate particles in dispersions and its distribution range is not a fixed value, but is affected by many factors, including preparation method, dispersing medium, dispersing conditions and so on.
Average particle size
Sol-gel method
The particle size of ammonium metatungstate prepared by the sol-gel method is small, generally between 10 and 70 nanometers. This method can prepare nanosized ammonium metatungstate particles with high specific surface area and catalytic activity.
Spray drying method
The particle size distribution of ammonium metatungstate particles prepared by the spray drying method is narrower and the particle size is smaller. For example, it has been shown that the average particle size of the hollow ammonium metatungstate spheres prepared by the spray drying method is 1.03 μm, but the method can also prepare flaky ammonium metatungstate with smaller particle size, which is roughly about 100~250 nm in thickness, and the particle size distribution of the particles is about 3 μm. It should be noted that the specific parameters of the spray drying method (e.g., hot air temperature, gas flow rate, dosing rate, etc.) will affect the particle size of the final product.
Other methods
The particles of ammonium metatungstate prepared by precipitation and hydrothermal methods are large, generally between 0.1 and 10 μm. In addition, the particles of ammonium metatungstate prepared under some specific conditions may have larger particle sizes, such as the particle size of WTS-1 ammonium metatungstate mentioned in some literatures is about 600 nm.
More details of ammonium metatungstate product, please visit website: http://ammonium-metatungstate.com/
Please contact CHINATUNGSTEN for inquiry and order of ammonium metatungstate:
Email: sales@chinatungsten.com
Tel.: 86 592 5129595
