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Science 14 June 1991:
Vol. 252. no. 5012, pp. 1532 - 1536
DOI: 10.1126/science.252.5012.1532
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Articles

Crystallinity of the Double Layer of Cadmium Arachidate Films at the Water Surface

F. LEVEILLER 1, D. JACQUEMAIN 1, M. LAHAV 1, L. LEISEROWITZ 1, M. DEUTSCH 2, K. KJAER 3, and J. ALS-NIELSEN 3

1 Structural Chemistry Department, Weizmann Institute of Science, Rehovot 76100, Israel
2 Physics Department, Bar-Ilan University, Ramat-Gan 52100, Israel
3 Physics Department, Risø National Laboratory, DK4000 Roskilde, Denmark

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 sim1000 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.

Submitted on November 2, 1990
Accepted on March 8, 1991

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Science. ISSN 0036-8075 (print), 1095-9203 (online)