Measuring Tungsten Oxide Physical Characteristics

As we all know, the physical characteristics of the tungsten oxide include specific surface area, pore volume, pore size distribution. Ammonium tungsten bronze (ATB), hydrogen tungsten bronze (HTB), purple tungsten oxide (TVO) and blue tungsten oxide (TBO) four kinds of tungsten oxide powder, the use of adsorption / desorption isotherms can be a good measure of the oxide physical characteristics: BET specific surface area such as, micropore volume, the pore volume, pore size distribution and fractional dimension.

(1)TVO has a maximum in the pore volume, the minimum value of the fractal dimension, a very smooth surface, which is conducive to the discharge of water let into the hydrogen, it is beneficial to use a hydrogen reduction process producing ultrafine tungsten powder. However, because the minimum micropore volume, the largest average pore size, pore size distribution and the narrowest having a wedge hole, which is not conducive to the doping process.

(2)HTB has the largest pore volume, maximum value of the fractal dimension (meaning very rough surface), the smallest average pore diameter and have open at one end, closed end cylindrical pore model, this is it for the doping process desirable.

(3)ATB and TBO HTB are smaller than have micropore volume and specific mesopore volume smaller TVO, ATB have a slit-like pore model, TBO having a pore structure open at both ends, for the hydrogen reduction process is, ATB and TVO TBO are not ideal for the doping process it, ATB and HTB TBO are not ideal.

(4)For the hydrogen reduction process or are required to study the physical characteristics of tungsten oxide before the doping process.

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