pH Value Controlling Tungsten Trioxide Form

pH value refers to the hydrogen ion concentration index (hydrogen ion concentration; French: potentiel d'hydrogène) , which is the total number and the total mass of the amount of hydrogen ions in solution than its value, it is commonly known as "pH (English pronunciation: [pʰi. :. ɛɪ̯tʃ]. pH value is the most important physical and chemical parameters of aqueous solution , it is natural phenomenon involving chemical changes. Therefore, it is used in industry, agriculture, medicine, environmental protection and scientific research fields.

Hydrothermal method for its mild reaction conditions is more appropriate to prepare the hexagonal tungsten trioxide product because hexagonal tungsten trioxide stables in the range of 200 ℃ -400 ℃. We can easily change the parameters of the reaction in the hydrothermal reaction system, such as pH, can form different reaction environment to obtain a different product, the search for crystal formation mechanism of trade is very useful to explore.

pH Value Controlling Tungsten Trioxide Form content:
Preparing hexagonal tungsten trioxide in hydrothermal environment, the study shows that when pH = 0.5, the formation of pure tungsten trioxide is oblique direction; when pH = 1.0, the resulting is oblique direction tungsten trioxide and tungsten acid mixture; when pH = 1.5, the product is completely converted to tungsten trioxide hexagonal phase, but when the pH = 2.0, the tungsten trioxide is obliquely peaks. pH was controlled within the range of 1.5-2.0 , which can get hexagonal tungsten trioxide crystalline form.

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