运动引起的伸展流中游动微生物悬浮液粘度的变化
Motility induced changes in viscosity of suspensions of swimming microbes in extensional flows
摘要：
运动细胞的悬浮液是用于理解通常由自推进颗粒的集合组成的活材料的独特机械性质的模型系统。我们在这里提出了一个定量的比较理论对实验的流变性，这样的悬浮液。利用一种新型的声驱动微流控毛细管破裂拉伸流变仪研究了细胞运动对细胞悬浮液粘度的影响。运动性增加的拉伸粘度的悬浮液的藻类拉，但减少它的情况下，细菌或精子推进器。最近的模型[Saintillan，Phys. Rev. E，2010，81：56307]稀释活性悬浮液扩展到获得预测更高的浓度后，独立获得参数，如游泳速度和扩散率。我们发现，身体和鞭毛形状的细节可以显着确定宏观流变行为。
英文摘要：
Suspensions of motile cells are model systems for understanding the unique mechanical properties of living materials which often consist of ensembles of self-propelled particles. We present here a quantitative comparison of theory against experiment for the rheology of such suspensions. The influence of motility on viscosities of cell suspensions is studied using a novel acoustically-driven microfluidic capillary-breakup extensional rheometer. Motility increases the extensional viscosity of suspensions of algal pullers, but decreases it in the case of bacterial or sperm pushers. A recent model [Saintillan, Phys. Rev. E, 2010, 81:56307] for dilute active suspensions is extended to obtain predictions for higher concentrations, after independently obtaining parameters such as swimming speeds and diffusivities. We show that details of body and flagellar shape can significantly determine macroscale rheological behaviour.
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