M. Kazayawoko et al., ESTIMATING THE WETTABILITY OF WOOD BY THE AXISYMMETRICAL DROP SHAPE-ANALYSIS CONTACT DIAMETER METHOD, Wood Science and Technology, 31(2), 1997, pp. 87-95
The wettability of four wood species was determined by the Axisymmetri
c Drop Shape Analysis-contact diameter (ADSA-CD) technique. The ADSA-C
D technique calculates the contact angle by solving the Laplace equati
on of capillary given the following variables: contact diameter, volum
e of the liquid drop, liquid surface tension, density difference betwe
en the two fluid phases and the gravity constant. The liquid surface t
ension, density, and gravity are known. The volume of the liquid sessi
le drop is obtained by means of a micrometer screw syringe. The contac
t diameter, the only main experimentally determinable variable is obta
ined by manually selecting an arbitrary set of coordinates characteriz
ing the perimeter of the sessile drop. The ADSA-CD technique was used
on four wood species (pine, cedar, ash and elm) and it was found to be
a simple, adaptable, and excellent tool for measuring the contact ang
les on wood surfaces.