Influence of Low-frequency Vibrational Modes on Polytypism of <i>n</i>-alkanes

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  • Kubota Hideki
    Department of Macromolecular Science, Graduate School of Science, Osaka University
  • Kawaguchi Tatsuya
    Department of Macromolecular Science, Graduate School of Science, Osaka University
  • Kaneko Fumitoshi
    Department of Macromolecular Science, Graduate School of Science, Osaka University

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Other Title
  • <i>n-</i>アルカンのポリタイプ現象における低振動数分子振動の影響
  • サイエンス記事 n-アルカンのポリタイプ現象における低振動数分子振動の影響
  • サイエンス キジ n アルカン ノ ポリタイプ ゲンショウ ニ オケル テイシンドウスウ ブンシ シンドウ ノ エイキョウ

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Abstract

<p>Crystal growth behaviors and thermodynamical properties were investigated for the two polytypic structures of n-alkanes. The solution crystallization of n-hexatriacontane (n-C36H74) were followed by oblique transmission micro-FTIR spectroscopy, which showed that a polytypic transformation took place during the crystallization. A single crystal appeared as single-layer polytype Mon and then a domain of double-layer polytype Orth II was generated heterogeneously. The crystal transformed gradually to a single crystal of Orth II through a solution-mediated phase transition. Inelastic neutron scattering measurements showed that the driving force of this transformation came from the difference in the vibrational density of state. From the frequency of methyl torsional mode, it is suggested that the cohesive force at the lamellar interface is stronger in Mon than in Orth II.</p>

Journal

  • hamon

    hamon 20 (2), 114-118, 2010

    The Japanese Society for Neutron Science

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