Molecular positional order in Langmuir-Blodgett films by atomic force microscopy

Journal Article · Fri Feb 05 04:00:00 EST 1993 · Science (Washington, D.C.); (United States)

DOI:https://doi.org/10.1126/science.259.5096.798· OSTI ID:6796510

Bourdieu, L; Ronsin, O; Chatenay, D ^[1]

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1. Inst. Curie, Paris (France)

Langmuir-Blodgett films of barium arachidate have been studied on both macroscopic and microscopic scales by atomic force microscopy. As prepared, the films exhibit a disordered hexagonal structure; molecularly resolved images in direct space establish a connection between the extent of the positional order and the presence of defects such as dislocations. Upon heating, the films reorganize into a more condensed state with a centered rectangular crystallographic arrangement; in this new state the films exhibit long-range positional order and unusual structural features, such as a height modulation of the arachidic acid molecules. 22 refs., 4 figs.

• OSTI ID: 6796510
• Journal Information: Science (Washington, D.C.); (United States), Journal Name: Science (Washington, D.C.); (United States) Vol. 259:5096; ISSN SCIEAS; ISSN 0036-8075
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
ARACHIDONIC ACID
BARIUM COMPOUNDS
CARBOXYLIC ACIDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
FILMS
MICROSCOPY
MOLECULAR STRUCTURE
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
TEMPERATURE EFFECTS