Formation of Hydroxyapatite/Titania Composite Film with Two Aerosol Beams

A hydroxyapatite/titania composite (HAp/TiO2) film was developed for application in air purification and as an antibacterial, antifouling film. This HAp/TiO2 film has the ability for adsorbing and decomposing organic matter. To obtain the HAp/TiO2 film, we used two kinds of aerosol beams. They were composed of TiO2 and HAp particles accelerated by flow of helium gas, respectively. First layer, TiO2 film, was formed on a glass plate with a TiO2 aerosol beam. Second layer, HAp film, was created on the first layer, TiO2 film. Neither the substrate nor HAp and TiO2 particles were heated during deposition. Acetaldehyde concentration reduced by the HAp/TiO2 film was measured to evaluate the film's ability for adsorbing and decomposing organic matter.