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

Authors

    • Institut für Materialphysik im WeltraumGerman Aerospace Center DLR
  • S. Lisinski
    • Institut für Materialphysik im WeltraumGerman Aerospace Center DLR
  • L. Ratke
    • Institut für Materialphysik im WeltraumGerman Aerospace Center DLR
  • D. Schaniel
    • 1. Physikalisches InstitutUniversität zu Köln
  • C. Willert
    • Institut für AntriebstechnikGerman Aerospace Center DLR
  • S. Altmeyer
    • Institut für angewandte Optik und Elektronik, Fachhochschule Köln
  • Th. Woike
    • 1. Physikalisches InstitutUniversität zu Köln
  • M. Voges
    • Institut für AntriebstechnikGerman Aerospace Center DLR
  • J. Klinner
    • Institut für AntriebstechnikGerman Aerospace Center DLR
Original Paper

DOI: 10.1007/s10971-007-1624-9

Cite this article as:
Krause, J., Lisinski, S., Ratke, L. et al. J Sol-Gel Sci Technol (2008) 45: 73. doi:10.1007/s10971-007-1624-9

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–gelGelation processParticle distributionParticle image velocimetry (PIV)Microparticles

Copyright information

© Springer Science+Business Media, LLC 2007