Atomic-force and fluorescence microscopy of Langmuir-Blodgett monolayers of [ital L]-[alpha]-dimyristoylphosphatidic acid

We have obtained fluorescence and atomic-force-microscopy images of the liquid and solid phases of Langmuir-Blodgett monolayers of [ital L]-[alpha]-dimyristoylphosphatidic acid, some containing [similar to]1 mol % of [ital L]-[alpha]-phosphatidylethanolamine-[ital N]-4-nitrobenzo-2-oxa-1,3-diazole....

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Bibliographic Details
Published in:Physical review. B, Condensed matter Condensed matter, 1993-11, Vol.48:19
Main Authors: Mikrut, J.M., Dutta, P., Ketterson, J.B., MacDonald, R.C.
Format: Article
Language:English
Subjects:
360606 - Other Materials- Physical Properties- (1992-)
AIR
DEPOSITION
ESTERS
FLUIDS
FLUORESCENCE
GASES
GLASS
HYDROGEN COMPOUNDS
INTERFACES
LIPIDS
LIQUIDS
LUMINESCENCE
MATERIALS SCIENCE
MICROSCOPY
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHOLIPIDS
ROUGHNESS
SOLIDS
SURFACE PROPERTIES
THIN FILMS
WATER
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Summary:We have obtained fluorescence and atomic-force-microscopy images of the liquid and solid phases of Langmuir-Blodgett monolayers of [ital L]-[alpha]-dimyristoylphosphatidic acid, some containing [similar to]1 mol % of [ital L]-[alpha]-phosphatidylethanolamine-[ital N]-4-nitrobenzo-2-oxa-1,3-diazole. The fluorescence microscopy images are similar to those of monolayers at the air-water interface, but slight differences indicate that changes occur in the monolayers as a result of the deposition process. The atomic-force-microscopy images show the clean glass substrates to be very much rougher than when the monolayers are deposited on them. We propose that a water layer provides a smooth surface on which the Langmuir-Blodgett monolayers rest. We measured a [similar to]25-A height difference between the liquid and solid phase region, one explanation being that the alkyl chains of the molecule are standing up in the solid phase and lying down in the liquid phase. This result is consistent with the fluorescence and atomic-force-microscopy images which show an increase in the amount of solid phase domains as a result of the deposition process. Further, the atomic-force-microscopy images of the monolayers show features which have not been described before and which could not be attributed to the presence of the dye. Finally, we showed that if the Langmuir-Blodgett monolayers are not stored in a humid environment, they begin to collapse into multilayers.
ISSN:0163-1829
1095-3795
DOI:10.1103/PhysRevB.48.14479