Journal
EUROPHYSICS LETTERS
Volume 49, Issue 6, Pages 761-767Publisher
E D P SCIENCES
DOI: 10.1209/epl/i2000-00216-4
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An ordered monolayer is found to form at the free surface of semi-fluorinated alkane melts, F(CF2)(12)(CH2)(n)H, 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 n similar to 10 the structure is fully crystalline, while for n similar to 18 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.
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