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Interdiffusion of Cadmium Arachidate in Langmuir-Blodgett Films

Published online by Cambridge University Press:  21 February 2011

Pieter Stroeve
Affiliation:
Department of Chemical Engineering, University of California, Davis, CA 95616
John F. Rabolt
Affiliation:
IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120
Russ O. Hilleke
Affiliation:
Argonne National Laboratory, Intense Pulsed Neutron Source, Argonne, IL 60439
Gian P. Felcher
Affiliation:
Argonne National Laboratory, Intense Pulsed Neutron Source, Argonne, IL 60439
Sow-Hsin Chen
Affiliation:
Department of Nuclear Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
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Abstract

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%.

Type
Research Article
Copyright
Copyright © Materials Research Society 1990

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References

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