Abstract
While the majority of experimental and numerical studies focus on yield stress fluids with short-range repulsive interactions, the effect of long-range interaction is rarely known. In this work, we studied the linear and nonlinear rheological behavior of a model oil in nematic liquid crystal emulsions, which exhibit long-range droplet-droplet interaction. The characteristic of long-range interaction, attractive at large droplet separation and repulsive at a small surface distance, was inferred from the morphology and thixotropy of emulsions. We suggested a model accounting for the plateau modulus purely due to the long-range repulsive interaction. We further illustrated that neither the yield stress nor the relaxation time followed a simple power-law scaling with respect to the distance to jamming. The rescaled steady and dynamic flow curves could not collapse on master curves above jamming transition when the long-range and short-range repulsive interactions contribute simultaneously.
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This study received support from the National Natural Science Foundation of China (No. 51625303, 21790344).
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Liu, Z., Yang, K. & Yu, W. Linear and nonlinear rheology of oil in liquid crystal emulsions. Rheol Acta 59, 783–795 (2020). https://doi.org/10.1007/s00397-020-01244-2
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DOI: https://doi.org/10.1007/s00397-020-01244-2