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Stable Ordering in Langmuir-Blodgett Films

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Science  17 Aug 2001:
Vol. 293, Issue 5533, pp. 1292-1295
DOI: 10.1126/science.1060018

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Abstract

Defects in the layering of Langmuir-Blodgett (LB) films can be eliminated by depositing from the appropriate monolayer phase at the air-water interface. LB films deposited from the hexagonal phase of cadmium arachidate (CdA2) at pH 7 spontaneously transform into the bulk soap structure, a centrosymmetric bilayer with an orthorhombic herringbone packing. A large wavelength folding mechanism accelerates the conversion between the two structures, leading to a disruption of the desired layering. At pH > 8.5, though it is more difficult to draw LB films, almost perfect layering is obtained due to the inability to convert from the as-deposited structure to the equilibrium one.

  • * To whom correspondence should be addressed. E-mail: gorilla{at}engineering.ucsb.edu

  • Present address: Department of Chemical Engineering, University of Colorado, Boulder, CO 80309, USA.

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