New Method for Measurement of Contact Angle : Droplet Free Vibration Frequency Method

概要

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We propose a new method for measuring the contact angle of a water droplet on a solid surface from the free vibration frequency. The method involves a new technique for vibrating a small droplet using surface acoustic waves (SAWs). We investigated experimentally the relationship between the contact angle of a water droplet on a SAW substrate and the free vibration frequency. The experimental results were compared with that of the theory based on normal-mode analysis and excellent agreement was obtained. The relationship was used to measure the contact angle of a water droplet on an arbitrary solid surface and to evaluate the solid surface condition.
社団法人応用物理学会の論文
1999-05-30