Abstract
Micro-contaminants on SUS304 stainless steel were observed and confirmed by atomic force microscope, and micro-contaminant removal was carried out by ultraviolet-ozone (UV-O3) treatment. With an increase in the holding time in air, particle- and film-like micro-contaminants appeared and their amount increased on the specimen surface. Then, the amount of particle-like contaminants decreased and finally almost all the surface was covered by film-like contaminants. The amount of micro-contaminants on the specimen surface decreased with an increase in UV-O3 treatment time, with extensive removal of the organic substance in the contaminants but leaving part of the contained water in the contaminants. The micro-contaminants slowly re-adhered on the treated surface when the surface was re-exposed to air, with a long period of more than 172 ks for the recovery to the state before the UV-O3 treatment. The surface for macro-droplets after the UV-O3 treatment became hydrophilic, while no large change of the wettability for micro-droplets on the same surface can be observed.
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