• Electrokinetic behaviour and dispersion characteristics of ceramic powders with cationic and anionic polyelectrolytes

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    • Keywords

       

      Electrokinetics; dispersion; alumina; zirconia; silicon nitride; polyelectrolytes; electroacoustophoresis; Darvan-C; Betz 1190

    • Abstract

       

      Three different ceramic powders, viz. alumina, zirconia and silicon nitride were dispersed using two polyelectrolytes, one cationic (Betz 1190) and the other anionic (Darvan-C). All powders examined during the study could be well dispersed only under conditions of polymer dosage and pH such that the working pH is at least 2 pH units away from the pHIEP of the powder-dispersant combination. The shift in the isoelectric point (IEP) of the powders were determined through electro-acoustic measurements on 1% volume suspensions. Specific free energy of interaction were also computed using a model based on the electrical double layer theory of surfactant absorption.

    • Author Affiliations

       

      Pradip1 R S Premachandran1 2 S G Malghan1 2

      1. Tata Research Development and Design Centre, 1, Mangaldas Road, Pune - 411/001, India
      2. Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD - 20899, USA
    • Dates

       
  • Bulletin of Materials Science | News

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