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    Contact angle measurement on rough surfaces

    Year: 2004

    Journal: Journal of Colloid and Interface Science (doi:10.1016/j.jcis.2004.02.036), 20111221

    Authors: Tammar S. Meiron Abraham Marmur and I. Sam Saguy

    Organizations: aInstitute of Biochemistry, Food Science and Nutrition, Faculty of Agricultural, Food and Environmental Quality Sciences, The Hebrew University of Jerusalem, Israel b Department of Chemical Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel

    A new method for the measurement of apparent contact angles at the global energy minimum on real surfaces has been developed. The method consists of vibrating the surface, taking top-view pictures of the drop, monitoring the drop roundness, and calculating the contact angle from the drop diameter and weight. The use of the new method has been demonstrated for various rough surfaces, all having the same surface chemistry. In order to establish the optimal vibration conditions, the proper ranges for the system parameters (i.e., drop volume, vibration time, frequency of vibration, and amplitude of vibration) were determined. The reliability of the method has been demonstrated by the fact that the ideal contact angles of all surfaces, as calculated from the Wenzel equation using the measured apparent contact angles, came out to be practically identical. This ideal contact angle has been compared with three methods of calculation from values of advancing and receding contact angles.