| Issue |
Europhys. Lett.
Volume 50, Number 2, April II 2000
|
|
|---|---|---|
| Page(s) | 222 - 228 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2000-00258-6 | |
| Published online | 01 September 2002 | |
Pseudo-contact angle due to superfluid vortices in 
Low Temperature Laboratory, Helsinki University of Technology, Espoo
P.O. Box 2200, FIN-02015 HUT, Finland
Received:
27
October
1999
Accepted:
27
January
2000
We have investigated spreading of superfluid 
on top of polished
and evaporated 
substrates. Our results show strongly varying contact
angles of 0–15 mrad on the evaporated layers. According to our
theoretical calculations, these contact angles can be explained by a
spatially varying distribution of vortex lines, the unpinning velocity of
which is inversely proportional to the liquid depth.
PACS: 68.45.Gd – Wetting / 67.70.+n – Films (including physical adsorption) / 67.40.Vs – Vortices and turbulence
© EDP Sciences, 2000
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