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Small‐angle X‐ray scattering study of the structure relaxation process in the dipalmitoylphosphatidylcholine(DPPC)–water system
Author(s) -
Ueno S.,
Takeda T.,
Komura S.,
Seto H.
Publication year - 1991
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889891004144
Subject(s) - small angle x ray scattering , dipalmitoylphosphatidylcholine , relaxation (psychology) , scattering , phase (matter) , metastability , chemistry , neutron scattering , quenching (fluorescence) , small angle neutron scattering , diffusion , materials science , crystallography , thermodynamics , optics , physics , psychology , phospholipid , social psychology , biochemistry , organic chemistry , membrane , phosphatidylcholine , fluorescence
Small‐angle X‐ray scattering (SAXS) studies have been performed to investigate the ordering process of the L β' , phase after being cooled from a metastable phase in the P β' temperature region in the dipalmitoylphosphatidylcholine(DPPC)–water system. The relaxation time for ordering of the structure in the L β' phase is about 100 min. It has been found that there is a minimum in the relaxation time as a function of the final quenching temperature. The relaxation time increases with decreasing temperature below around 298–K while it increases with increasing temperature above 298–K as a pretransition temperature is approached. It is considered that, in the former phenomenon, the relaxation is governed by diffusion and, in the latter, critical slowing down takes place. Earlier results of small‐angle neutron scattering are in agreement with these SAXS results.