Electrochemical properties of barium sulfate precipitation membranes

Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 73)


“New Trends in Colliod Science” contains the proceedings of the foundation meeting of the European Colloid and Interface Society (ECIS), October 1–3, 1986. Representatives from the major European groups working in this field contributed to the conference. The volume contains an up-to-date account of present developments in Colloid Science. The contributions cover a wide scope of subjects, and provide encouragement that structures and transport processes in dense colloidal systems can be understood on basic principles. The main subjects are include:
  • phase diagrams of new surfactant systems

  • microemulsions and their applications

  • vesicles and bilayers

  • transport properties of colloidal systems.


A structural model of precipitation membranes proposed by Hirsch-Ayalon (see [4]) is tested by the following experiments: (a) Measurements of the zeta potential of suspended BaSO4 crystals are used to estimate the sign and the absolute value of the charge density of the adsorption charges of the crystals forming the membrane, (b) the concentration limits for maintaining the membrane properties of BaSO4 precipitation zones, as well as for generating precipitation zones with membrane properties are established. Measurements of the non-ohmic current-voltage characteristics of a BaSO4 precipitation membrane demonstrate that Ba++ ions can be partially replaced by La+++ ions to maintain the membrane properties of BaSO4 precipitation zones.

Key words

Membrane precipitation transport properties barium sulfate 


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Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1987

Authors and Affiliations

  1. 1.Institut für Physikalische ChemieUniversität KölnKölnGermany
  2. 2.Department of ChemistryUniversity of KhartoumKhartoumSudan

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