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Dynamical Molecular Conformation and Structure of Cluster for Saturated and Unsaturated Fatty Acids in the Liquid State

Research Project

Project/Area Number 10640566
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 機能・物性・材料
Research InstitutionKITASATO UNIVERSITY

Principal Investigator

IWAHASHI Makio  Kitasato Univ.School of Sci., Professor, 理学部, 教授 (70087120)

Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2000: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1999: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1998: ¥2,300,000 (Direct Cost: ¥2,300,000)
Keywordscis-6-octadecenoic acid / cis-9-octadecenoic acid / cis-11-octadecenoic acid / trans-9-octadecenoic acid / fatty acids / self-diffusion coefficient / density / X-ray diffraction for liquid / 脂肪酸 / 自己拡散係数 / 密度 / シス-6-オクタデセン酸 / シス-9-オクタデセン酸 / シス-11-オクタデセン酸 / トランス-9-オクタデセン酸 / オクタデカン酸 / スピン-格子緩和時間 / 液体のX線回析
Research Abstract

The translational movement, the dynamical molecular conformation, and the aggregate structure in the liquid state for three kinds of cis-type unsaturated fatty acids (cis-6-, cis-9-, and cis-11-octadecenoic acids), trans-type unsaturated acid (trans-9-octadecenoic acid), and n-saturated acid (octadecanoic acid) have been studied through the measurements of density, self-diffusion coefficient, ^<13>C NMR spin-lattice relaxation time, and X-ray diffraction. The magnitude of the self-diffusion coefficient, D, fell in sequence of cis-type unsaturated acids > trans-type acids > saturated acid below 350 K.Above 350 K the value of D for the trans-type acid rose to those for the cis-type acids. On the other hand, the density ρ for the acids also fell in the order of cis-type acids > trans-type acid > saturated acid ; the order of the density is just opposite to that expected from the results of the self-diffusion coefficient and other physical properties such as melting point and heat of fusion. This discrepancy between D and ρ values for the acids is well explained by the models of the clusters in their liquids.

Report

(4 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] Makio Iwahashi et al.: "Self-Diffusion,Dynamical Molecular Conformation,and Liquid Structures of n-Saturated and Unsaturated Fatty Acids"Journal of Physical Chemistry B. 104. 6186-6194 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Makio Iwahashi, Yasutoshi Kasahara, Hideyo Matsuzawa, Kenichiro Yagi, Kenji Nomura, Hikaru Terauchi, Yukihiro Ozaki, and Masao Suzuki: "Self-Diffusion, Dynamical Molecular Conformation, and Liquid Structures of n-Saturated and Unsaturated Fatty Acids"Journal of Physical Chemistry B. 104(26). 6186-6194 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Iwahashi,Y.Kasahara,H.Matsuzawa,K.Yagi,K.Nomura,H.Terauchi,Y.Ozaki,and M.Suzuki: "Self-Diffusion,Dynamical Molecular Conformation and Liquid Structures of n-Saturated and Unsaturated Fatty Acids"Journal of Physical Chemistry B.. 104(26). 6186-6194 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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