Hard sphere colloidal dispersions: Viscosity as a function of shear rate and volume fraction

DOI PDF 被引用文献5件
  • C. G. de Kruif
    Van’t Hoff Laboratorium voor Fysische en Colloid Chemie, Trans III, De Uithof, Padualaan 8, 3584CH Utrecht, The Netherlands
  • E. M. F. van Iersel
    Van’t Hoff Laboratorium voor Fysische en Colloid Chemie, Trans III, De Uithof, Padualaan 8, 3584CH Utrecht, The Netherlands
  • A. Vrij
    Van’t Hoff Laboratorium voor Fysische en Colloid Chemie, Trans III, De Uithof, Padualaan 8, 3584CH Utrecht, The Netherlands
  • W. B. Russel
    Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544

抄録

<jats:p>The viscosities of suspensions of sterically stabilized (hard) silica spheres in cyclohexane are reported as a function of shear rate (γ̇) and volume fraction (6×10−4&lt;φ&lt;0.6). The shear thinning scales according to (ηr−η∞)/(η0−η∞) =1/(1+1.31ηγ̇a3/kT) with limiting low and high shear viscosities described up to φ∼0.35 by η0=1+5/2φ+(4±2)φ2+(42±10)φ3 , η∞=1+5/2φ+(4±2)φ2+(25±7)φ3 . At higher volume fractions the viscosity becomes more sensitive to φ and diverges at φm=0.63±0.02 (γ̇→0) , φm=0.70±0.02 (γ̇→∞) . The experimental results compare well with existing hard sphere theories and the data of Krieger (1972) for aqueous lattices. Even at the highest volume fraction neither yield stresses nor shear thickening are observed.</jats:p>

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