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Science 11 October 1996:
Vol. 274. no. 5285, pp. 233 - 235
DOI: 10.1126/science.274.5285.233
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Reports

Flow-Induced Molecular Orientation of a Langmuir Film

Takayuki Maruyama, Gerald Fuller, * Curtis Frank, Channing Robertson

The two-dimensional fluid dynamics of the different phases of a fatty acid monolayer (docosanoic acid) were examined. Brewster angle microscopy was used to investigate the polydomain structure of two "liquid condensed" phases (the L2 and L'2 phases) and the "solid" (S) phase in situ during an extensional flow. Only the L2 phase deformed affinely with a liquid-like response. The two other phases experienced flow-induced reorientation of the lattice onto which the molecules were arranged. The reorientation process was accompanied by the appearance of shear bands in the monolayers at an angle of ±45 degrees to the extension axis of the flow.

Department of Chemical Engineering, Stanford University, Stanford, CA 94305-5025, USA.
*   To whom correspondence should be addressed.

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Adaptation of Bulk Constitutive Equations to Insoluble Monolayer Collapse at the Air-Water Interface.
J. P. Kampf, C. W. Frank, E. E. Malmström, and C. J. Hawker (1999)
Science 283, 1730-1733
   Abstract »    Full Text »


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