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The Measurement of Surface Energy by Video Analysis of Captive-Bubble Contact-Angles

Published online by Cambridge University Press:  11 May 2009

Jeremy C. Thomas  and
John Davenport
Jeremy C. Thomas
Affiliation:
University Marine Biological Station, Millport, Isle of Cumbrae, KA28 OEG
John Davenport
Affiliation:
University Marine Biological Station, Millport, Isle of Cumbrae, KA28 OEG
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Extract

Surface energy has been demonstrated to have a significant effect upon the settlement and growth of many marine organisms. However, the measurement of surface energy has either been too expensive for most marine laboratories to consider its use, or the methods used have relied upon classical contact-angle theory. Modern contact-angle theory and a video-based technique using captive bubbles are described. The technique is non-destructive, inexpensive, rapid and accurate enough to compare living and man-made surfaces. A precision of ~5° has been achieved and rapidly-changing angles can be quantified. Data for PTFE sheet, Parafilm, acetate sheet, Geltek gel, sea-water-conditioned slate, Porphyra umbilicalis (L.) Agardh, Ciona intestinalis (L.), and Cyanea capillata (L.) are presented. The contact angles for the living surfaces are smaller (31–44°) than for all the non-living surfaces (73–112°), suggesting overall higher surface energies for the biological materials studied.

Type
Short Communications
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 75 , Issue 3 , August 1995 , pp. 763 - 766
Copyright
Copyright © Marine Biological Association of the United Kingdom 1995

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