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Spreading of Liquid Droplets on Cylindrical Surfaces: Accurate Determination of Contact Angle.

Published online by Cambridge University Press:  21 February 2011

H. Daniel Wagner ,
E. Wiesel  and
H. E. Gallis
H. Daniel Wagner
Affiliation:
Polymeric Composites Laboratory, Materials Research Department, The Weizmann Institute of Science, Rehovot 76100, Israel
E. Wiesel
Affiliation:
Polymeric Composites Laboratory, Materials Research Department, The Weizmann Institute of Science, Rehovot 76100, Israel
H. E. Gallis
Affiliation:
Polymeric Composites Laboratory, Materials Research Department, The Weizmann Institute of Science, Rehovot 76100, Israel
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Abstract

The wetting of cylindrical monofilaments by liquid polymers is a problem of much scientific and technological importance. In particular, the characterization of the physicochemical nature of interfaces is a key problem in the field of advanced fibrous composites. The macroscopic regime contact angle, which reflects the energetics of wetting at the solid-liquid interface, is difficult to measure by usual methods in the case of very thin cylindrical fibers.

In the present article a numerical method is proposed 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, para-aramid, and glass fibers, are presented to demonstrate the high degree of accuracy of the method proposed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 170: Symposium N – Interfaces in Composites , 1989 , 141
Copyright
Copyright © Materials Research Society 1990

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References

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