Original Paper

Journal of Sol-Gel Science and Technology

, Volume 45, Issue 1, pp 73-77

Observation of gelation process and particle distribution during sol–gel synthesis by particle image velocimetry

  • J. KrauseAffiliated withInstitut für Materialphysik im Weltraum, German Aerospace Center DLR Email author 
  • , S. LisinskiAffiliated withInstitut für Materialphysik im Weltraum, German Aerospace Center DLR
  • , L. RatkeAffiliated withInstitut für Materialphysik im Weltraum, German Aerospace Center DLR
  • , D. SchanielAffiliated with1. Physikalisches Institut, Universität zu Köln
  • , C. WillertAffiliated withInstitut für Antriebstechnik, German Aerospace Center DLR
  • , S. AltmeyerAffiliated withInstitut für angewandte Optik und Elektronik, Fachhochschule Köln
  • , Th. WoikeAffiliated with1. Physikalisches Institut, Universität zu Köln
  • , M. VogesAffiliated withInstitut für Antriebstechnik, German Aerospace Center DLR
  • , J. KlinnerAffiliated withInstitut für Antriebstechnik, German Aerospace Center DLR

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Abstract

The gelation of alcogels mixed with microparticles of the nonlinear optical material BaTiO3 was studied with Particle Image Velocimetry (PIV). It is shown that the distribution of the microparticles in the gel is homogeneous and that the gelation occurs continuously throughout the gel body. We demonstrate that PIV is a useful method to study the gelation kinetics: The transition from a colloidal solution to a gel can be measured without any assumption on the rheology of the colloidal solution. The detected linear decrease of the flow velocity with time is described as the linear part of the critical behavior.

Keywords

Sol–gel Gelation process Particle distribution Particle image velocimetry (PIV) Microparticles