Microemulsion Preparing Tungsten Trioxide

Microemulsion method refers to the two immiscible solvent to form an emulsion under the action of surfactant, heating treatment nano particles in microvesicles by nucleation, coalescence, agglomeration. Monodisperse particles are characterized by good interface. Monodisperse microemulsion system is thermodynamically stable, transparent water droplets in oil (w / o) or oil in water (O / W) is formed, its micro-particle structure is 5 ~ 70 nm, it is an ordered combination of surfactant molecules in the water. Schulman dropped alcohol in the emulsion in 1943，which is the first time to prepare transparent or translucent, and even long-term stable microemulsion.

The following steps to describe the preparation of tungsten trioxide:
1. Stirring 8ml of cyclohexane and 12ml of n-butanol.
2. The obtained mixed solution is divided into 2 parts of solution A and solution B, solution A is added in 6ml1: 1 hydrochloric acid solution, having 15min phacoemulsification.
3. The B solution is added 3ml sodium tungstate solution, having 15min phacoemulsification.
4. The emulsion is added dropwise to hydrochloric acid sodium tungstate solution until yellow solution is far from exacerbating.
5. Stop stirring, aging 16h, the supernatant liquid is removed, drying over anhydrous ethanol and washing several times with distilled water each, then centrifuged, and then put into the oven at 100 ℃ drying to obtain precursor.

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