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31 P and 13 C NMR studies on the phase structures of the binary barium ethyl octyl phosphate–water system
Author(s) -
Yoshida Tadayoshi,
Miyagai Kiyotaka,
Taga Keijiro,
Okabayashi Hirofumi,
Matsushita Kazuhiro
Publication year - 1990
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260280811
Subject(s) - chemistry , micelle , phase (matter) , barium , monomer , binary system , phosphorus 31 nmr spectroscopy , analytical chemistry (journal) , proton nmr , critical micelle concentration , nuclear magnetic resonance spectroscopy , crystallography , inorganic chemistry , stereochemistry , chromatography , organic chemistry , binary number , polymer , aqueous solution , arithmetic , mathematics
31 P nuclear magnetic resonance (NMR) studies of the four phases (I, II, II′ and III) in the barium ethyl octyl phosphate‐water system were carried out. The concentration dependence of the 31 P chemical shift, half‐height width and line shape provided information on the phase structures. For phase I the critical micelle concentration (CMC) is found at 1.2 wt.%, and above this concentration there is a monomer ⇌ micelle equilibrium. Phase II has a monomer ⇌ micelle equilibrium system, similar to phase I. Phase II′ is an aggregate system and is structurally organized. The structure of phase III is more organized than that of phase II′ and depends strongly on concentration. The 3 J (POCC) values were also used to establish the restricted state of the POCC single bond in the phases.