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Melting of 1-octadecene inside the pores of open-morphology silica gel: thermodynamic model and experimental studies

Abstract

Melting of crystalline compounds inside the nanopores of open-morphology porous systems was studied on a model system, consisted of 1-octadecene and silica gels with different pore sizes, by means of thermogravimetry, differential scanning calorimetry and powder X-ray diffraction. The parameters of silica gels porous structure (surface area, pore size and volume) were calculated using N2 adsorption data. To describe the experimental results, a new thermodynamic model of crystallites melting inside the nanopores of irregular shape was established. This model allows an analytical prediction for the shift of phase transition temperature and melting enthalpy (latent heat of melting) due to the surface tension effects. To a first approximation, both parameters must linearly depend on the specific ratio of the total surface of pores to their total volume, and experimental studies have mostly confirmed this result for the melting of 1-octadecene confined inside the pores of a wide range of various silicas (with the pores of different sizes and geometry).

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Hnatiuk, K.I., Dinzhos, R.V., Simeonov, M.S. et al. Melting of 1-octadecene inside the pores of open-morphology silica gel: thermodynamic model and experimental studies. J Therm Anal Calorim 141, 1243–1250 (2020). https://doi.org/10.1007/s10973-019-09133-4

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  • DOI: https://doi.org/10.1007/s10973-019-09133-4

Keywords

  • Melting
  • Phase transition
  • Nanopores
  • Surface tension effects
  • 1-Octadecene
  • Silica gel