Evaluation of Melting and Crystalline Relaxation Temperatures of Fatty Acid Monolayers on the Water Surface and Their Importances for Molecular Aggregation States in Monolayers

DOI PDF 被引用文献15件 参考文献11件
  • Tisato Kajiyama
    Department of Chemical Science and Technology, Faculty of Engineering, Kyushu University
  • Yushi Oishi
    Department of Chemical Science and Technology, Faculty of Engineering, Kyushu University
  • Motoko Uchida
    Department of Chemical Science and Technology, Faculty of Engineering, Kyushu University
  • Naoaki Morotomi
    Department of Chemical Science and Technology, Faculty of Engineering, Kyushu University
  • Jun-ichi Ishikawa
    Department of Chemical Science and Technology, Faculty of Engineering, Kyushu University
  • Youichi Tanimoto
    Department of Chemical Science and Technology, Faculty of Engineering, Kyushu University

書誌事項

公開日
1992-03-01
権利情報
  • https://academic.oup.com/pages/standard-publication-reuse-rights
DOI
  • 10.1246/bcsj.65.864
公開者
Oxford University Press (OUP)

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<jats:title>Abstract</jats:title> <jats:p>The melting temperature, Tm and the crystalline relaxation temperature, Tαc of fatty acid monolayers on the water surface were evaluated by a combination of two kinds of measurements, the subphase temperature, Tsp dependence of monolayer modulus based on a π-A isotherm and also, the Tsp dependence of the electron diffraction, ED patterns of monolayer. Tms of myristic, palmitic, and stearic acid monolayers were evaluated to be 278, 301, and 317 K, respectively, on the basis of both apparent decrease in the Tsp vs. modulus curve and the change of the ED pattern from a crystalline Debye ring to an amorphous halo. The crystalline relaxation process corresponds to a change from elastic to viscoelastic characteristics in a crystalline phase due to a considerable contribution of anharmonic thermal molecular vibration. Tαcs of palmitic and stearic acid monolayers were evaluated to be 291 and 298 K, respectively, from both apparent decrease in the Tsp dependence of modulus and appearance of the break in the thermal expansion coefficient of crystalline lattice constant. This break may be attributed to a remarkable increase in contribution of the anharmonic term with respect to the intermolecular potential energy. The magnitude of Tm and Tαc of monolayers on the water surface is an important factor to decide the structure or aggregation state in the crystalline and amorphous monolayers and also, the formation process of a large-area monolayer, that is, the fusion or sintering behavior among crystalline monolayer domains.</jats:p>

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