Effects of Pressure, Temperature, and Particles Size on O2 Diffusion Dynamics in Silica Nanoparticles

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Abstract

The O2 diffusion process in silica nanoparticles is experimentallystudied in samples of average radius of primary particles ranging from 3.5 to 20 nmand specific surface ranging from 50 to 380 (m2/g). The investigation is done in thetemperature range from 98 to 177 °C at O2 pressure ranging from 0.2 to 66 bar bymeasuring the interstitial O2 concentration by Raman and photoluminescencetechniques. The kinetics of diffusion can be described by the Fick’s equation with aneffective diffusion coefficient depending on the temperature, O2 pressure, andparticles size. In particular, the dependence of the diffusion coefficient on thepressure and nanoparticles size is more pronounced at lower temperatures and isconnected to morphological and physical factors.
Lingua originaleEnglish
pagine (da-a)9456-9462
Numero di pagine7
RivistaJOURNAL OF PHYSICAL CHEMISTRY. C
Volume117
Stato di pubblicazionePublished - 2013

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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