High purity BTO powder has the same determining procedures of ammonia as described in “99.9% Nano Blue Oxide”. There are several matters needing attention in this experiment. Notices of determination experiment of ammonia content in high purity BTO powder are shown as follows: 1. The order of connection of the conical flasks must not be wrong. Air should be sniffed through the long tube, and then flow out from the short tube. Otherwise, the liquid will be pumped into the…

99.9% blue tungsten oxide nanopowder’s quality is guaranteed by determining ammonia content to meet clients’ requirements. Therefore, people studied the determination method of ammonia in blue tungsten oxide. It has been proved by experiments and practice that the following methods may meet production control to analyze ammonia indicators in blue tungsten oxide. 1. Instruments and Reagents Four conical flasks (300ml) with double- hole rubber plugs. A flow meter cylinder. C(1/2H2SO4)=0.5mol/L H2SO4 standard solution; C(Noah)=0.5mol/L NaOH standard solution. 30% NaOH solution.…

99.95% blue tungsten oxide nanopowder’s NH3 content is reasonably controlled to better ensure the stable phase composition of blue tungsten oxide, which is the method for controlling the stability of BTO on phase composition since the 1990s. In the 1980s, the quality control of blue tungsten oxide producing process was based on controlling the oxygen index to ensure the stability of phase composition of blue tungsten oxide. Currently, domestic and foreign customers have different requirements for NH3 content. Some requests…

Tungsten blue oxide is the full name of TBO, which is not a defined tungsten compound, but a powdery mixture of tungsten trioxide, β-tungsten oxide (blue tungsten oxide), γ-tungsten oxide (violet tungsten oxide), ammonium tungsten bronze and hydrogen tungsten bronze. And the chemical composition and physical properties of BTO are changing. TBO may be produced by calcinating ammonium paratungstate (APT) in the airtight space or under hydrogen atmosphere/hydrogen-nitrogen mixed gas. The composition of TBO varies greatly on the basis of…