Abstract
Contact angles on partially methylated quartz plates and particles of known surface coverage have been measured as a function of surface coverage and compared with predictions based on the Cassie equation. Advancing and receding water-contact angles on quartz plates have been determined by the captive-bubble and sessile-drop methods. Advancing water-contact angles have been measured on quartz particles using the Washburn equation. Both advancing and receding contact angles on methylated quartz plates are in good agreement with predictions based on the Cassie equation. Advancing water-contact angles measured on methylated quartz particles are in good agreement with Cassie equation predictions up to surface coverages of about 70% and angles of approximately 70°, above which the measured angles are less than anticipated.
Published Version
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