Abstract
The trajectories of aerosol droplets are examined in an attempt to model tin oxide film growth in the spray pyrolysis and the corona spray pyrolysis of aqueous tin tetrachloride. It is found that, during the distillation of tin tetrachloride solutions, the boiling point will increase to 152 °C at which point hydrolysis occurs and tin oxide powder is formed. From this and other measurements, it is concluded that tin oxide films are grown from the distilled vapour of droplets passing very close to a hot glass surface in a kind of chemical vapour deposition. Droplets which strike the surface form a powdery deposition whether or not hydrolysis occurs before or after impact. Thermophoretic forces keep most of the aerosol from the surface in non-electrostatic spraying but the use of corona charging often causes extensive powder formation. By the use of a laminar flow geometry and moderate electric field deflection of charged aerosol, we hope to improve the efficiency of film growth. This can be accomplished by forcing the droplets closer to the hot glass while avoiding actual contact.
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