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Phase transitions in non‐ionic surfactant–water systems as studied by Raman spectrometry. II —A new methodology
Author(s) -
Gaufrès R.,
Bribes J.L.,
Sportouch S.,
Ammour J.,
Maillols J.
Publication year - 1988
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250190302
Subject(s) - raman spectroscopy , lyotropic , phase transition , isotropy , hexagonal phase , pulmonary surfactant , phase (matter) , micelle , anisotropy , ionic bonding , chemistry , lyotropic liquid crystal , materials science , ionic liquid , chemical physics , analytical chemistry (journal) , crystallography , ion , thermodynamics , chromatography , organic chemistry , optics , aqueous solution , liquid crystalline , physics , biochemistry , catalysis
In order to compare the molecular Raman spectra between an optically isotropic phase and an anisotropic phase, a method is proposed having especially in view the study of transitions in lyotropic surfactant systems. Its application to the transition between the isotropic and hexagonal phases in the water‐α‐octyl‐ω‐hydroxypentakis (oxyethylene) system shows that there is no significant molecular structure change at transition. This result suggests that all the micelles in the L 1 phase in equilibrium with the hexagonal phase have a cylindrical shape.