| Issue |
Europhys. Lett.
Volume 56, Number 2, October 2001
|
|
|---|---|---|
| Page(s) | 234 - 240 | |
| Section | Condensed matter: structural, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00511-0 | |
| Published online | 01 December 2003 | |
Evidence for asymmetric edge-on Langmuir monolayer: Application to surface potential measurements
1
Laboratoire Objets Complexes et Interfaces d'intérêt Biologique (OCIIB)
CNRS-FRE 2303, Université René Descartes
45 rue des Saints-Pères - 75006 Paris, France
2
LURE, Campus universitaire d'Orsay
91400 Irsay, France
Corresponding author: el-abed@biomedicale.univ-paris5.fr
Received:
12
February
2001
Accepted:
19
July
2001
We show, using surface pressure vs. molecular area isotherm measurements
and synchrotron grazing X-ray diffraction, that 4BCD12 molecules, which
consist of a central flexible bowl-like core to which eight long
lateral hydrocarbon chains are bound, form a stable edge-on monolayer. Experimental
data indicate that six lateral hydrocarbon chains orient upwards to form a
quasi-rectangular lattice of 43
tilted hydrocarbon chains. The obtained axially asymmetric phase, which we label
edge
-on, allows using surface potential measurements, for the
validation of literature electric models of a single monolayer spread at the
air-water interface.
PACS: 61.10.-i – X-ray diffraction and scattering / 68.60.-p – Physical properties of thin films, nonelectronic / 77.55.+f – Dielectric thin films
© EDP Sciences, 2001
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