Effect of Carboxymethylcellulose on Agglomeration and Dispersal of Polystyrene Particle Agglomerates with Step-Wise Shear Rate Change

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  • Furuse Nobuhiko
    Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University
  • Komoda Yoshiyuki
    Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University
  • Suzuki Hiroshi
    Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University

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Other Title
  • 剪断速度増加に伴うポリスチレン粒子の凝集・分散挙動に対するカルボキシメチルセルロースの影響
  • センダンソクド ゾウカ ニ トモナウ ポリスチレン リュウシ ノ ギョウシュウ ・ ブンサン キョドウ ニ タイスル カルボキシメチルセルロース ノ エイキョウ

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Dispersion and agglomeration of particles with a drastic change in fluid flow differs from those under a steady shear flow. In this study, the development and destruction of particle agglomerates with step-wise shear rate change were investigated by microscopic observation, and the results were compared with particle dispersibility predicted from rheological data. Polystyrene particles with strong agglomerative properties could be controlled by addition of small amount of carboxymethylcellulose (CMC). Once the particles were sufficiently dispersed, the agglomeration process was dominated by the collision of particles and was not affected by polymer concentration. When the amount of adsorbed CMC was sufficient to prevent the aggregation of particles, agglomerates readily dispersed to an agglomerative state corresponding to the applied shear rate. However, insufficient adsorption of CMC resulted in a heterogeneous agglomeration process that took longer time to attain steady agglomerated state. Slurry viscosity was employed to evaluate agglomerative nature except under conditions of complete dispersion.

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