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Interdiffusion of Cadmium Arachidate in Langmuir-Blodgett Films

Published online by Cambridge University Press:  21 February 2011

Pieter Stroeve
Department of Chemical Engineering, University of California, Davis, CA 95616
John F. Rabolt
IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120
Russ O. Hilleke
Argonne National Laboratory, Intense Pulsed Neutron Source, Argonne, IL 60439
Gian P. Felcher
Argonne National Laboratory, Intense Pulsed Neutron Source, Argonne, IL 60439
Sow-Hsin Chen
Department of Nuclear Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
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The interdiffusion of Cadmium Arachidate (CdA) in Langmuir-Blodgett films has been studied by neutron reflection at the Intense Pulsed Neutron Source of Argonne National Laboratory. One of the samples consisted of a few layers of perhydro H-CdA deposited on a silicon support, overlayered with a few layers of deuterated D-CdA, for a total thickness of ∼300 Angstroms. In a second sample the layers of perhydro-and deuterated- CdA were separated by two monolayers of Hn-octadecene/co-maleic acid copolymer. When heated for 15 minutes at 70°C, well below the disorder temperature [1], approximately 25% of the D-CdA molecules were replaced by H-CdA molecules, although the overall Langmuir-Blodgett film structure is known to remain unchanged [1]. The presence of copolymer layers limited the interdiffusion process to about 5%.

Research Article
Copyright © Materials Research Society 1990

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