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Oscillatory-shear-induced order in nonaqueous dispersions of charged colloidal spheres

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  • Yan, Y.D.
  • Dhont, J.K.G.
  • Smits, C.
  • Lekkerkerker, H.N.W.

Abstract

A light scattering study is presented of the nonequilibrium microstructure of nonaqueous dispersions of repulsive charged colloidal silica spheres subjected to an oscillatory shear flow. Two ordered structures are induced upon increasing the oscillation amplitude: alternating face-centred-cubic (fcc) twins and registered randomly stacked sliding layers. The transition between these structures shifts to lower amplitudes as particle volume fraction is increased. This is consistent with predictions of a simple strained fcc-lattice packing model previously developed for hard spheres. There are, however, quantitative differences due to the softness of the interparticle interactions of our system. In addition, we find that the fcc twins appear much more slowly than the sliding layers and that the former occurs mainly due to shear orientation of existing crystallites. We also observe that the formation of the sliding layers depends on the amplitude as well as the frequency of oscillation.

Suggested Citation

  • Yan, Y.D. & Dhont, J.K.G. & Smits, C. & Lekkerkerker, H.N.W., 1994. "Oscillatory-shear-induced order in nonaqueous dispersions of charged colloidal spheres," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 202(1), pages 68-80.
    • Handle: RePEc:eee:phsmap:v:202:y:1994:i:1:p:68-80
    DOI: 10.1016/0378-4371(94)90167-8
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    1. Mr. Pierre Dhonte & Mr. Jean A. P. Clément & Mr. Mbuyamu I Matungulu & Ms. Dawn Elizabeth Rehm, 1993. "Economic Trends in Africa: The Economic Performance of Sub-Saharan African Countries," IMF Working Papers 1993/071, International Monetary Fund.
    2. Böhne, Ferdinand R., 1968. "Wettbewerb und Marketing-Mix im Einzelhandel," Wirtschaftsdienst – Zeitschrift für Wirtschaftspolitik (1949 - 2007), ZBW - Leibniz Information Centre for Economics, vol. 48(5), pages 285-287.
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