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Science 24 July 1992:
Vol. 257. no. 5069, pp. 508 - 511
DOI: 10.1126/science.257.5069.508
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Articles
Surface Order and Stability of Langmuir-Blodgett Films
D. K. Schwartz 1,
J. Garnaes 1,
R. Viswanathan 1, and
J. A. N. Zasadzinski 1
1 Department of Chemical and Nuclear Engineering, University of California, Santa Barbara, CA 93106
Angstrom-resolution atomic force microscope images of Langmuir-Blodgett monolayers and multilayers of cadmium arachidate in air and under water show a dramatic change from a disordered arrangement to a crystalline lattice by the addition or removal of a single layer of molecules. The disordered surface is less stable than the ordered one to mechanical stresses such as atomic force microscopy tip forces or at the air-water contact line during contact angle measurements. The difference in the degree of order in the alkyl chains is attributed to the strong attractive interaction between headgroups in the presence of the divalent cation.
Submitted on April 1, 1992
Accepted on May 29, 1992
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- Langmuir-Blodgett Films of a Functionalized Molecule with Cross-Sectional Mismatch Between Head and Tail.
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