We applied shear to a silica nanoparticle dispersion in a microfluidic jet device and observed direction-dependent structure along and across the flow direction. The asymmetries of the diffraction patterns were evaluated by x-ray cross correlation analysis. For different Rayleigh nozzle sizes and shapes, we measured the decay of the shear-induced ordering after the cessation of the shear. At large tube sizes and small shear rates, the characteristic times of the decay become longer, but Péclet-weighted times do not scale linearly with Péclet numbers. By modeling particle distributions with the corresponding diffraction patterns and comparing measured shape asymmetry to simulations, we determined the variation of volume fraction over the azimuthal angle for the maximum ordered state in the jet.

中文翻译：

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通过X射线互相关分析看到的液体微射流中的剪切诱导排序

我们在微流体喷射装置中对二氧化硅纳米颗粒分散体施加剪切力，并观察到沿流动方向的方向相关结构。通过X射线互相关分析评估衍射图的不对称性。对于不同的瑞利喷嘴尺寸和形状，我们测量了剪切停止后剪切诱导的有序性的衰减。在较大的试管尺寸和较小的剪切速率下，衰减的特征时间会变长，但Péclet加权的时间不会随Péclet数线性增长。通过对具有相应衍射图样的颗粒分布进行建模，并将测得的形状不对称性与仿真结果进行比较，我们确定了射流中最大有序状态下体积分数在方位角上的变化。