Volume 49, Number 6, March 2000
|Page(s)||761 - 767|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Surface phases of semi-fluorinated alkane melts
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: email@example.com
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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