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.

中文翻译：

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液晶乳液中油的线性和非线性流变学

虽然大多数实验和数值研究都集中在具有短程排斥相互作用的屈服应力流体上，但很少有人知道长程相互作用的影响。在这项工作中，我们研究了模型油在向列型液晶乳液中的线性和非线性流变行为，其表现出长程液滴-液滴相互作用。从乳液的形态和触变性推断出长程相互作用的特性，在大液滴分离时有吸引力，在小表面距离处排斥。我们提出了一个模型来解释完全由于长程排斥相互作用而产生的高原模量。我们进一步说明，屈服应力和弛豫时间都没有遵循简单的幂律比例关系，即到干扰的距离。