Crystallinity of the double layer of cadmium arachidate films at the water surface

F. Leveiller, D. Jacquemain, M. Lahav, L. Leiserowitz, M. Deutsch, K. Kjaer, J. Als-Nielsen

Research output: Contribution to journalArticlepeer-review

113 Scopus citations


A crystalline counterionic layer at the interface between an electrolyte solution and a charged layer of insoluble amphiphilic molecules was observed with grazing incidence synchrotron x-ray diffraction. Uncompressed arachidic films spread over 10-3 molar cadmium chloride solution (pH 8.8) spontaneously form crystalline clusters with coherence lengths of ∼1000 angstroms at 9°C. Ten distinct diffraction peaks were observed, seven of which were attributed to scattering only from a crystalline Cd2+ layer and the other three to scattering primarily from the arachidate layer. The reflections from the Cd2+ layer were indexed according to a 2 x 3 supercell of the arachidate lattice with three Cd2+ ions per cadmium unit cell.

Original languageEnglish
Pages (from-to)1532-1536
Number of pages5
Issue number5012
StatePublished - 1991


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