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Effects of Polyacrylic Acid Concentration on Its Conformation and on the Stability of Alumina Suspensions

  • Kuiri F. Tjipangandjara
  • P. Somasundaran

Abstract

Effect of polyacrylic acid concentration on the stability of alumina suspension is studied here and interpreted on the basis of the conformation of the adsorbed polyacrylic species. The conformation of polyacrylic acid species was monitored using fluorescence technique with pyrene as probe. By allowing polyacrylic acid first to adsorb on alumina in coiled form at low pH and then raising the pH, a drastic increase in flocculation was seen at low polyacrylic concentrations, while dispersion of the slurry was observed at higher concentrations. Analysis of the slurry showed that the adsorbed polyacrylic acid underwent concentration-dependent conformational changes which affected the stability of the slurry. At low concentrations conformation of the adsorbed polyacrylic acid transformed from coiled to stretched, resulted in better bridging of the extended polymer chain between the particles, and enhanced flocculation. At higher polymer concentrations such conformational transition was absent because of crowding of the polymer chains on the particles; as a result, the suspension remained dispersed. This study shows for the first time how correlation of adsorbed polymer configuration, determined by fluorescence, with stabilization can be utilized to obtain better dispersion or flocculation of colloidal suspensions.

Keywords

Zeta Potential Polyacrylic Acid Coiled Conformation Alumina Suspension Polymer Conformation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Elsevier Science Publishing Co., Inc. 1990

Authors and Affiliations

  • Kuiri F. Tjipangandjara
    • 1
  • P. Somasundaran
    • 1
  1. 1.Langmuir Center for Colloids and Interfaces, Henry Krumb School of MinesColumbia UniversityNew YorkUSA

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