Advertisement

Characterization of the acid-base properties of alumina surfaces

  • M. Airiau
  • N. Lebel
Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 93)

Abstract

Three aluminas have been characterized by electrophoretic mobilities measurements in polar nonaqueous solvents, differential thermal analysis, and infrared spectroscopy, in order to study the acid-base properties of their surfaces. The solvents were chosen according to the Gutmann donor/acceptor concept to cover a wide range of electron acceptor and electron donor numbers. The electron donor properties of the three alumina surfaces are different and correlate with water desorption and OH abundance as seen by DTA and IR spectroscopy. Conversely, the electron acceptor properties are identical for the three surfaces. These facts are interpreted as results of the presence of electropositive (Al) or electronegative (O) atoms in different quantities at the surface of the oxides.

Key words

alumina surface electrophoretic mobility acid-base properties non-aqueous medium 

References

  1. 1.
    Gutmann V (1988) The Donor-Acceptor Approach to Molecular Interactions. Plenum, New YorkGoogle Scholar
  2. 2.
    Siffert B, Kuczinski J, Papirer E (1990) J Colloid Interface Sci 135(1):107CrossRefGoogle Scholar
  3. 3.
    Labib, Mohamed E (1984) J Colloid Interface Sci 97(2):356CrossRefGoogle Scholar
  4. 4.
    Labib, Mohamed E “The origin of the surface charge on particles suspended in organic liquids”, no ref.Google Scholar

Copyright information

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

Authors and Affiliations

  • M. Airiau
    • 1
  • N. Lebel
    • 1
  1. 1.Rhône-Poulenc RecherchesAubervilliersFrance

Personalised recommendations