Stable Ordering in Langmuir-Blodgett Films

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 centrosymm...

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Veröffentlicht in:Science (American Association for the Advancement of Science) 2001-08, Vol.293 (5533), p.1292-1295
Hauptverfasser: Takamoto, Dawn Y., Aydil, Eray, Zasadzinski, Joseph A., Ivanova, Ani T., Schwartz, Daniel K., Yang, Tinglu, Cremer, Paul S.
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Sprache:eng
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Zusammenfassung: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.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1060018