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Thermally Induced Rearrangement of Molecules in Barium Stearate Multilayer Films
Author(s) -
Englisch U.,
Gutberlet T.,
Steitz R.,
Oeser R.,
Oietsch U.
Publication year - 1997
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(199705)201:1<67::aid-pssb67>3.0.co;2-u
Subject(s) - stearic acid , stearate , barium , superstructure , molecule , silicon , materials science , deuterium , melting point , crystallography , chemical engineering , chemistry , organic chemistry , composite material , thermodynamics , physics , quantum mechanics , metallurgy , engineering
Abstract Barium stearate multilayer films have been prepared by use of the Langmuir‐Blodgett technique transferring sequentially deuterated and nondeuterated bilayers on a silicon support. Combined X‐ray and neutron scattering experiments show a rearrangement of the molecules when the films have been annealed at temperatures higher than 60 °C. Whereas the periodicity of the barium sheets is unchanged, the intensity of the superstructure peak decreases close to the melting point of the stearic acid component (about 70 °C) and vanishes completely above. This behaviour is explained by the vertical movements and rearrangements of stearic acid molecules without noticeable evaporation of molecules.