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Science 17 August 2001:
Vol. 293. no. 5533, pp. 1292 - 1295
DOI: 10.1126/science.1060018
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Reports
Stable Ordering in Langmuir-Blodgett Films
Dawn Y. Takamoto,1
Eray Aydil,1
Joseph
A. Zasadzinski,1*
Ani
T. Ivanova,2
Daniel K. Schwartz,2
Tinglu Yang,3
Paul S. Cremer3
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.
1 Department of Chemical Engineering and
Materials, University of California, Santa Barbara, CA 93106, USA.
2 Department of Chemistry, Tulane University, New
Orleans, LA 70118, USA.
3 Department of Chemistry,
Texas A&M University, College Station, TX 77843, USA.
*
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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