Phase Transitions of Some Alyphatic Molecular Crystals in Confined Space

Authors

  • M. M. Lazarenko Taras Shevchenko National University of Kyiv
  • A. N. Alekseev Taras Shevchenko National University of Kyiv
  • S. A. Alekseev Taras Shevchenko National University of Kyiv
  • Yu. E. Grabovsky Taras Shevchenko National University of Kyiv
  • M. V. Lazarenko National University of Food Technology

Abstract

Phase transformations of nanostructured 1-octadecene and 10-undecylenic acid were studied by thermophysical methods, FTIR spectroscopy and X-ray diffraction. It was shown that bulk as well as nanostructured 1-octadecene crystallizes in orthorhombic unit cell. However, the unit cells of 10-undecylenic acid in bulk and inside the porous silicon are differen, but with the same large period of the pattern. The transition between orthorhombic crystalline and orthorhombic rotation-crystalline phases in boundary layer takes place at -60oC for nanostructured 1?octadecene and at -95oC for nanostructured 10-undecylenic acid. At the same time, the melting temperatures decrease in the confined media comparing to bulk for both substances (?Т = 11°C and ?Т = 19°C, respectively).

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Lazarenko, M. M.; Alekseev, A. N.; Alekseev, S. A.; Grabovsky, Y. E.; Lazarenko, M. V. Phase Transitions of Some Alyphatic Molecular Crystals in Confined Space. Him. Fiz. Tehnol. Poverhni 2011, 2, 128-134.

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Vol. 2 No. 2 (2011): Chemistry, Physics and Technology of Surface / Himia, Fizika ta Tehnologia Poverhni

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