Abstract
To better understand the characteristics for preventing organic contaminants from accumulating on the critical surfaces of spacecraft, we studied on the effective prevention of molecular contaminants by using photocatalysts under ultraviolet irradiation and vacuum conditions. Squalene, tetra-methyl tetra-phenyl tri-siloxane, oleamide and diethylhexyl phthalate were used as model contaminants. TiO2 particles and TiO2-coated substrates were used as photocatalysts. TiO2 was effective in weight losses of all organics under the conditions. Transmittance of the TiO2-coated substrates increased depending on UV irradiation time.
