Spreading of Liquid Droplets on Cylindrical Fibers: Accurate Determination of Contact Angle
The characterization of the physicochemical nature of interfaces is a key problem in the field of advanced fibrous composites. In the case of thin cylindrical monofilaments wetted by liquid polymers, the macroscopic regime contact angle, which reflects the energetics of wetting at the solid-liquid interface, is difficult to measure by usual methods. A numerical method is proposed in this article for the calculation of macroscopic regime contact angles from the shape of a liquid droplet spread onto a cylindrical monofilament. This method, which builds on earlier theoretical treatments by Yamaki and Katayama /1/, and Carroll /2/, very much improve the accuracy of the contact angle obtained. Experimental results with high-strength carbon, paraaramid, and glass fibers, are presented to demonstrate the high degree of accuracy of the method proposed.
KeywordsContact Angle Carbon Fiber Liquid Droplet Apparent Contact Angle Cylindrical Fiber
Unable to display preview. Download preview PDF.
- 3.Gilbert A. (private communication).Google Scholar
- 4.Nardin, M., Ward, I. M., Materials Science and Technology, 3 (1987) 814.Google Scholar
- 6.Carlson, B. C., “Special Functions of Applied Mathematics”, (New York, Academic Press, 1977).Google Scholar
- 7.Chang, H. W., Smith, R. P., Li, S. K., Neumann, A. W., spiin “Molecular Characterization of Composite Interfaces” (Polymer Sci. & Technol. Ser.: Vol. 27), H. Ishida and J. Kumar, Eds., (New Jersey, Plenum Press, 1985), 413.Google Scholar