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In situ study of the dynamics of erosion of carbon black agglomerates

Abstract : With the help of a counter-rotating transparent rheometer equipped with an optical microscope, the erosion of single, commercial carbon black agglomerates suspended in a polyisobutylene fluid was accurately recorded in situ. We observed that clouds of very small aggregates were leaving the agglomerate at 45 and 225 degrees in the shear gradient-flow direction plane, where the stress is maximum. The distribution of the arrached aggregates is more efficient when the carbon black agglomerate is more asymmetric. A spherical agglomerate of critical radius R-o will reach a radius R-t at time t following R-o(3) - R-t(3) = at, a being a constant. This implies that the rate at which the number of aggregates is leaving the agglomerate is a constant, independent of the size of the agglomerate.
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Submitted on : Tuesday, November 16, 2010 - 11:54:30 AM
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Olivier Seyvet, Patrick Navard. In situ study of the dynamics of erosion of carbon black agglomerates. Journal of Applied Polymer Science, Wiley, 2001, 80 (10), p.1627-1629. ⟨10.1002/app.1256⟩. ⟨hal-00536481⟩



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