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We report a real-time, two-dimensional light scattering study of the evolution of structure in a concentrated electrorheological fluid during the ``liquid-solid'' phase transition. We find that after particle chaining along the electric field lines, strong light scattering lobes appear at a finite scattering wave vector q orthogonal to the field lines, and then brighten as they move to q=0. This indicates the existence of an unstable concentration fluctuation that signifies the segregation of chains into columns. We suggest a theoretical explanation for our results.
Martin et al. (Mon,) studied this question.
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