Volume 56, Number 2, October 2001
|Page(s)||234 - 240|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||01 December 2003|
Evidence for asymmetric edge-on Langmuir monolayer: Application to surface potential measurements
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: firstname.lastname@example.org
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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