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    Semi-reversible collapse of preformed cobalt stearate Langmuir monolayer on water surface

    Year: 2021

    Journal: J. Mol. Struct., Volume 1238, AUG 15

    Authors: Kundu, Sarathi

    Organizations: Department of Science and Technology

    Keywords: Langmuir monolayer; Preformed cobalt stearate; Monolayer collapse; Compression-decompression isotherm; Out-of-plane structure; Surface morphology

    Langmuir monolayer of preformed cobalt stearate molecules shows semi-reversible behavior under successive compression-decompression surface pressure versus area per molecule isotherm cycles. However, the conventional cobalt stearate Langmuir monolayer, where cobalt stearate is formed at the air-water interface shows highly irreversible behavior. Films of preformed cobalt stearate molecules are deposited on the hydrophilic silicon substrates by horizontal deposition method at different points of the isotherms to obtain their structure and morphology for the specific surface pressure and subphase pH conditions. Combination of monolayer and different multilayer domains formed by the tilted (layer thickness approximate to 41.0 angstrom) and untilted (layer thickness approximate to 46.0 angstrom) molecules are present in the films as obtained from the X-ray reflectivity and atomic force microscopy. Microscopic information implies that in such reversible collapse the multilayer domains are surrounded by the compact monolayer or trilayer domains. Folding from monolayer to multilayer structure with compression and then again reincorporation as a monolayer after decompression on the water surface indicates the presence of long-range connectivity among the preformed cobalt stearate molecules. (C) 2021 Elsevier B.V. All rights reserved.
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