Online ISSN : 1884-636X
Print ISSN : 1349-046X
ISSN-L : 1349-046X
Influence of Low-frequency Vibrational Modes on Polytypism of n-alkanes
Hideki KubotaTatsuya KawaguchiFumitoshi Kaneko
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2010 Volume 20 Issue 2 Pages 114-118


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.

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© 2010 The Japanese Society for Neutron Science
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