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Preparation and properties of dispersions of colloidal boehmite rods

  • P. A. Buining
  • A. P. Philipse
  • C. Pathmamanoharan
  • H. N. W. Lekkerkerker
Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 93)

Abstract

Dispersions of colloidal boehmite (γ-AlOOH) rods (of controllable length) are prepared from alkoxide precursors. A polyisobutene grafting procedure leads to sterically stabilized dispersions. In the organophilic system (L ≈ 200 nm ± 50%; D ≈ 10 nm ± 25%) an isotropic-nematic phase separation is observed for boehmite volume fractions between 3.8% and 14.6%. The effect of polydispersity on the phase diagram is well predicted qualitatively by Onsager’s theory extended to bidisperse mixtures.

Key words

Boehmite rods organophilic isotropic-nematic phase separation 

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Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1993

Authors and Affiliations

  • P. A. Buining
    • 1
  • A. P. Philipse
    • 1
  • C. Pathmamanoharan
    • 1
  • H. N. W. Lekkerkerker
    • 1
  1. 1.Van’t Hoff Laboratory for Physical and Colloid ChemistryUniversity of UtrechtThe Netherlands

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