Mutsumi Takeda

Micropure water wettability evaluation of SUS304 steel with a tapping mode of atomic force microscope

Abstract Micro pure water wetting morphologies on SUS304 steel surface before and after immersion corrosion in 3.5 mass% sodium chloride aqueous solution were observed with a tapping mode of atomic force microscope. The micro pure water wettabilities of these were evaluated.

Micro pure water wettability evaluation with an AC no-contact mode of atomic force microscope

The macro and micro water droplets on natural mica and pure chromium surface were observed with an AC no-contact mode of atomic force microscope. The micro pure water wettabilities of mica and chromium were evaluated according to the observation results. The observation of micro water droplets on mica and pure chromium surfaces becomes possible with the AC no-contact mode of atomic force microscope even if the cantilever is not metal film-coated and not applied with any bias voltage. The micro water wettabilities on mica and pure chromium surfaces were evaluated by the equation θ=2tan−1(h/r), where θ is the contact angle between micro water droplet and substrate, h is the height of the water droplet and r is the radius of the water droplet. The wettabilities of mica and pure chromium are different from each other and the micro wettability is higher than the macro one even on the same material surface according to the measured data in this paper.