オクタデカノールＬ膜の緩和挙動

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タイトル別名
  • Relaxation Behavior of a Langmuir Monolayer of Octadecanol.

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An octadecanol monolayer on water was investigated with regard to surface pressure relaxation and area creep at 283 K. Under surface pressure less than 20 mN/m, the relaxation and creep completed within a few ten minutes and the monolayer showed a homogeneous morphology. The monolayer under higher surface pressure continued to relax. FT-IR spectra of monolayer films indicated that an absorption band of the CH2 asymmetric stretching mode shifted to low energy with increasing the surface pressure. Molecules in the monolayers after pressure relaxation and area creep preferred to gauche-and trans-configuration, respectively. The compression and dilatation of the monolayer gave rise to a hysteresis curve in the surface pressure(II)-area(A) relationship and the dynamic viscosity measured by canal method was 2∼3×10-6 Pa. s. m. These could be related with the gauche-traps transformation. The collapses of the monolayer were found at high surface pressure. Homogeneous octadecanol monolayers could be formed after creep at about 20 mN/m.

収録刊行物

  • 表面科学

    表面科学 14 (5), 265-271, 1993

    公益社団法人 日本表面科学会

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