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THE SURFACE-TENSION OF CORK FROM CONTACT-ANGLE MEASUREMENTS

TitleTHE SURFACE-TENSION OF CORK FROM CONTACT-ANGLE MEASUREMENTS
Publication TypeJournal Article
Year of Publication1993
AuthorsGOMES, CMCPS., Fernandes A. C., & DEALMEIDA B. D.
JournalJOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume156
Pagination195-201
Keywordschemical complexity, geometric method, harmonic method, physical complexity
Abstract

The surface tension of cork is evaluated from contact angle measurements in cork-water-air and cork-methylene iodide-air systems, using the geometric and the harmonic mean methods. The contact angles were studied as a function of time and, in each case, the extrapolated value for t = 0 was used in the calculations to obtain γs. In spite of the chemical and physical complexity of cork, it was possible to obtain an average value for its surface tension γs = 32 ± 3 dyne cm-1 and polarity γPS/γS= 0.25. These values were compared to others obtained for several natural products such as wood or cellulose derivatives.