Dynamic viscoelasticity of flocculated suspensions

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Abstract Addition of polyacrylamide to silica suspensions causes flocculation by bridging. When a network structure of flocs with infinite size forms, the suspensions respond elastically to small strains. The viscoelastic behavior depends not only on the particle concentration but also on the polymer concentration. The relation among storage modulus, particle concentration, and polymer concentration was analyzed by constructing a phase diagram for elastic percolation. For suspensions with the same complex modulus at very small strains, but different compositions, the dynamic viscoelasticity showed the same dependence of complex modulus on the strain. The storage modulus is constant at very small strains and begins to decrease above some critical value. The critical strain implying the onset of structural rupture is given as a function of the linear storage modulus only.

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