Abstract
A liquid droplet on a plate slides down at a critical inclination angle of the plate. Applying the theoretical results about the sliding angle of droplets obtained in the preceding report, the surface properties of SAMs were evaluated. The advancing and receding contact angles of SAMs plates made by immersion method were measured for BCA and ethylene glycol. From the results of 4 kinds of test plates with different immersion time, the contact angle hysteresis becomes minimum (about 3°) for the reference plate (immersion time 5min) with most homogeneous monolayers among others. The experimental sliding angles agreed well with theoretical ones. The sliding angle φ of the reference plate is minimum and the difference of φ from the other plates with some defects on the surfaces is more than 6° for BCA and 4° for ethylene glycol. Hence the surface defects on SAMs plates could be detected from the simple measurements of sliding angles of droplets
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