Dynamical dimer structure and liquid structure of fatty acids in their binary liquid mixture: dodecanoic and 3-phenylpropionic acids system |
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Authors: | Iwahashi Makio Takebayashi Shintaro Umehara Atsushi Kasahara Yasutoshi Minami Hideyuki Matsuzawa Hideyo Inoue Tohru Takahashi Hiroshi |
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Institution: | Department of Chemistry, School of Science, Kitasato University, 1-15-1 Kitasato, Sagamihara, Kanagawa-ken 228-8555, Japan. maki@kitasato-u.ac.jp |
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Abstract: | Dimer structure and liquid structure of fatty acids in the binary liquid mixture of dodecanoic (LA) and 3-phenylpropionic acids (PPA) were studied through the measurements of DSC, self-diffusion coefficient (D), density, viscosity, 13C NMR spin-lattice relaxation time, small-angle X-ray scattering (SAXS), and small-angle neutron scattering (SANS). The phase diagram of LA/PPA mixture exhibited a typical eutectic pattern, which means that LA and PPA are completely immiscible in solid phase. In the liquid phase of the LA/PPA mixture, D of LA always differed from that of PPA irrespective of their compositions. This exhibited that, in the liquid phase of the binary mixture of fatty acids giving a complete eutectic in the solid phase, the fatty acid dimers are composed of the same fatty acid species irrespective of their compositions. The liquid structure of the LA/PPA mixture was clarified through the SAXS and also the SANS measurements. |
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Keywords: | Dodecanoic acid 3-Phenylpropionic acid Eutectic mixture Dimer structure of fatty acid Liquid structure Self-diffusion coefficient of fatty acid |
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