Abstract
Electrowetting has gained popularity in present days for its wide range of applications. This phenomenon can be described as change in the contact angle of solid-electrolyte interface caused by an application of potential difference between solid and the electrolyte. Application of voltage causes a hydrophobic surface to behave like hydrophilic surface. The electric energy counterbalances the free surface energy and lowers the surface tension [1, 2, 3]. The wide range of application of this phenomenon starts from electronic display, liquid lens with variable focal length in cellular phones, cameras, switches for optical fibres to biomedical applications like tumour detection, endoscopy etc. It is easy to operate and has fast response. In this paper we are studying the change in contact angle of the miniscule droplet with respect to variation in applied voltage in MATLAB 7.10.0 platform [4]. Image Processing tools are used on the liquid droplet obtained experimentally to find the angle made by the liquid meniscus with the horizontal plane. An algorithm is developed for automatic detection of boundary and measurement of the contact angle of the miniscule droplet. The experimental finding and the results obtained from the developed algorithm are in good agreement with each other. The guiding equation for the proposed work is based on Young- Lippmann equation.
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