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Influence of adsorbed polymers on the removal of mineral particles from a planar surface

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Abstract

Experimental results on the role of adsorbed polymers on the particle adhesion are presented. Both Brownian (silica particles) and non-Brownian (glass beads) particles were used. The particles were deposited onto the internal surface of a glass parallelepiped cell, and then submitted to increasing laminar flow rates. The pH and the ionic strength of the electrolytes were fixed. The adhesive force was related to the hydrodynamic force required to dislodge 50% of the initially attached beads. We found that high molecular weight PEO had little effect on the adhesion of small silica beads due to the low affinity of the polymer for silica or glass surfaces. On the contrary, PEO greatly enhanced the adhesion of bigger glass beads forced to deposit on the capillary surface because of gravity. The increase was all the more pronounced as the molecular weight of the polymer was high. The effect of high molecular weight cationic copolymers on the adhesion of silica particles was drastic. The maximal force (1500 pN) applied by the device could not enable any particle detachment even using polymers of low cationicity rate (5%), showing the efficiency of electrostatic attractions. When copolymers were adsorbed on both surfaces (particles and plane), the adhesive force exhibited a maximum at intermediate coverage of particles. This optimum was related to the optimum flocculation concentration classically observed in flocculation of suspensions by polymers.

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Author notes

  1. V. Chaplain

    Present address: Unité de Phytopharmacie et Médiateurs, Chimiques INRA Route de Sanit-Cyr, 78026, Versailles, France

Authors and Affiliations

  1. Laboratoire de Biorhéologie et d’Hydrodynamique Physicochimique, Université Paris, VII CNRS URA 343 2, place Jussieu, 75451, Paris, France

    J. L. Counord

  2. Laboratoire de Physicochimie Macromoléculaire, de l’université Pierre et Marie Curie, CNRS URS 278 10, rue Vauquelin ESPCI, 75231, Paris, France

    M. L. Janex & R. Audebert

Authors
  1. M. L. Janex
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  2. V. Chaplain
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  3. J. L. Counord
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  4. R. Audebert
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Janex, M.L., Chaplain, V., Counord, J.L. et al. Influence of adsorbed polymers on the removal of mineral particles from a planar surface. Colloid Polym Sci 275, 352–363 (1997). https://doi.org/10.1007/s003960050092

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  • DOI: https://doi.org/10.1007/s003960050092

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