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

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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.

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Authors and Affiliations

  1. Institut für Materialphysik im Weltraum, German Aerospace Center DLR, Linder Höhe, 51170, Koln, Germany

    J. Krause, S. Lisinski & L. Ratke

  2. 1. Physikalisches Institut, Universität zu Köln, Zülpicherstr. 77, 50937, Koln, Germany

    D. Schaniel & Th. Woike

  3. Institut für Antriebstechnik, German Aerospace Center DLR, Linder Höhe, 51170, Koln, Germany

    C. Willert, M. Voges & J. Klinner

  4. Institut für angewandte Optik und Elektronik, Fachhochschule Köln, Betzdorfer Str. 2, 50679, Koln, Germany

    S. Altmeyer

Authors
  1. J. Krause
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  2. S. Lisinski
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  3. L. Ratke
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  4. D. Schaniel
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  5. C. Willert
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  6. S. Altmeyer
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  7. Th. Woike
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  8. M. Voges
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  9. J. Klinner
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Correspondence to J. Krause.

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Krause, J., Lisinski, S., Ratke, L. et al. Observation of gelation process and particle distribution during sol–gel synthesis by particle image velocimetry. J Sol-Gel Sci Technol 45, 73–77 (2008). https://doi.org/10.1007/s10971-007-1624-9

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  • DOI: https://doi.org/10.1007/s10971-007-1624-9

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