| Issue |
Europhys. Lett.
Volume 49, Number 6, March 2000
|
|
|---|---|---|
| Page(s) | 761 - 767 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2000-00216-4 | |
| Published online | 01 September 2002 | |
Surface phases of semi-fluorinated alkane melts
1
Physics Department, Bar Ilan University - Ramat Gan 52900, Israel
2
Organische Chemie III, Universität Ulm - D-89069 Ulm, Germany
3
Exxon Research and Engineering Co. - Route 22E, Annandale, NJ 08801,
USA
4
Physics Department, Brookhaven National Laboratory - Upton, NY 11973, USA
Corresponding author: deutsch@mail.biu.ac.il
Received:
14
July
1999
Accepted:
3
January
2000
An ordered monolayer is found to form at the free surface of semi-fluorinated alkane melts,
F(CF2)12(CH2)nH, a few degrees
above the bulk freezing point. X-ray and surface tension measurements
show the monolayer to assume one of two different structures, depending on n
. For 
the structure is fully crystalline, while for 
it has only short-range in-plane order. This can be
assigned to packing frustration of the different diameter F and H blocks,
for chain lengths where their respective intermolecular interactions
become comparable.
PACS: 68.10.-m – Fluid surfaces and fluid-fluid interfaces / 61.25.Em – Molecular liquids / 64.70.Dv – Solid-liquid transitions
© EDP Sciences, 2000
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