Journal of Sol-Gel Science and Technology

, Volume 2, Issue 1–3, pp 227–231 | Cite as

Phase separation kinetics in silica sol-gel system containing polyethylene oxide. I. Initial stage

Code: C7
  • Kazuki Nakanishi
  • Yuki Yamasaki
  • Hironori Kaji
  • Naohiro Soga
  • Tadashi Inoue
  • Norio Nemoto
Article

Abstract

Domain formation kinetics in gelling alkoxy-derived silica solutions containing polyethylene oxide (PEO) has been investigated. The time-resolved light scattering measurement was performed for the polymerizing solutions which underwent phase separation in the length scale of micrometer. Domain formation processes which resulted in various sizes of inter-connected morphology were examined, focusing mainly on the initial stage. For all the samples, the scattering intensity grew exponentially with time forming a single peak at a fixed wave-number in the first few tens seconds, which is the characteristic of the linearized regime of the spinodal decomposition. An analysis based on the linearized theory proposed by Cahn gave a reasonable description of the kinetic parameter of phase separation induced in various stages of the sol-gel transition.

Keywords

silica poly(ethylene oxide) light scattering spinodal decomposition initial stage 

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Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • Kazuki Nakanishi
    • 1
  • Yuki Yamasaki
    • 1
  • Hironori Kaji
    • 1
  • Naohiro Soga
    • 1
  • Tadashi Inoue
    • 2
  • Norio Nemoto
    • 2
  1. 1.Division of Material Chemistry, Faculty of EngineeringKyoto UniversityKyotoJapan
  2. 2.Institute for Chemical ResearchKyoto UniversityKyoto-fuJapan

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