The particle size distribution range of ammonium metatungstate particles is not a fixed value, it is affected by a variety of factors, including preparation methods, process conditions, purity of raw materials and so on. The following is a summary of the particle size distribution range of ammonium metatungstate particles based on information from different sources:
Nanoscale range
Sol-gel method
The size of ammonium metatungstate particles prepared by sol-gel method is small, and the range of particle size distribution is generally between 10 and 70 nanometers. This method is capable of preparing nanoscale ammonium metatungstate particles with high specific surface area and catalytic activity.
Micron scale range
Spray drying method
The range of particle size distribution of ammonium metatungstate particles prepared by the spray drying method may vary depending on the specific conditions. For example, the flaky ammonium metatungstate particles prepared by spray drying method in some studies have a thickness of about 100-250 nm, but the overall particle size distribution of the particles may reach several micrometers. In addition, the average particle size of hollow ammonium metatungstate spheres may reach more than 1 μm, but the exact range of particle size distribution needs to be determined according to the experimental conditions.
Precipitation and hydrothermal methods
The particle sizes of ammonium metatungstate particles prepared by these two methods are larger, and the range of particle size distribution is generally between 0.1 and 10 micrometers. But again, the exact value will be affected by the process conditions.
Wider distribution
The particle size distribution range of ammonium metatungstate particles may be wider under certain specific conditions or for specific applications. For example, the particle size distribution of samples prepared from ammonium metatungstate as a tungsten source, as mentioned in some literature, may reach several hundred nanometers or even micrometers.
Influence of preparation method
Different preparation methods can lead to significant differences in the particle size distribution of ammonium metatungstate particles. Therefore, when comparing data from different literatures, it is necessary to pay attention to the differences in preparation methods.
Influence of process conditions
Even if the same preparation method is used, different process conditions (e.g., temperature, pressure, time, solution concentration, etc.) will have an effect on the particle size distribution of the particles. Therefore, it is necessary to optimize the process conditions according to the needs of the specific application in order to obtain the desired particle size distribution.
Accuracy of the measurement method
The method of particle size measurement also affects the accuracy of the results. Therefore, when comparing data from different literature, it is necessary to pay attention to the differences and reliability of the measurement methods.
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