6 we hopefully conducted an experiment in class with

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Unformatted text preview: small or very large, do the equations you derived in the first two parts still apply? 6. We (hopefully) conducted an experiment in class with water and a capillary (1 mm outer and 0.85 mm inner diameter) with three surface treatments: (a) the native glass (b) the native surface cleaned with oxygen plasma, and (c) the native surface coated with silane. We measured capillary rise heights of roughly 20 mm, 33 mm, and -10 mm (we could not see this one in class, but I ran another experiment and determined it to be this value) for the native, plasma cleaned, and silane surfaces, respectively. Calculate the contact angles for these three cases and label them as hydrophilic or hydrophobic. Draw schematics of the contact angle for cases (b) and (c). 2 7. A metal paper clip can be floated on the surface of water. Since the metal is more dense than water, it should have sunk to the bottom, but because of surface tension it floated on a surface. The water surface becomes deformed resulting in Solutions Manualthe Fluid M...
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This document was uploaded on 02/06/2014.

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