Abstract
The ability of a solid surface to be wetted by a liquid can be classified by its wetting contact angle, θC: hydrophilic (θC<90°), hydrophobic (90°⩽θC⩽150°), or super-hydrophobic (θC>150°). To study the wetting behaviour of material surfaces, commercial contact angle analysers are generally employed. In this paper, we report on the construction and testing of a wetting contact angle analyser. To test the performance of the measurement system, we have measured the contact angles of films from commercial paraffin wax and polytetrafluoroethylene (PTFE). The contact angles are found to be in good agreement with the values described in the literature; thus, our analyser can be useful not only for research but also for educational purposes.
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