傾斜平板法および光学手法を組み合わせた接触角の精密測定(流体工学,流体機械)

概要

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A new method was proposed to measure the advancing and receding contact angles by combining the tilting plate and the optical methods. Because of its too high sensitivity, the optical method is usually not applied to measure the contact angles which may widely change from 0 to 180 degrees. In the method proposed in this study, first the liquid-gas interface attached to the test plate was set horizontally as possible by adjusting the inclination of the plate (tilting plate method). Since the interface should not be perfectly horizon, the small inclination angle of the liquid-gas interface at the plate was detected by using the reflection of Laser beam that was directed vertically on the interface. The contact angle can be obtained from the difference of the inclination between the test plate and the interface measured by the optical method. Based on the proposed method, the contact angles were actually measured for each combination between various test plates and liquids. The experimental results were in good agreement with those of another method within the experimental uncertainty. The contact angles can be measured with the accuracy of 0.01 degs. Also the local contact angle can be measured by the space resolution of 50μm corresponding to the diameter of Laser beam.
2010-10-25