标题： 活性边界在活性向列-被动各向同性流体混合物中的主动排序 显示英文标题

标题： Active sorting to boundaries in active nematic -- passive isotropic fluid mixtures

摘要： 我们使用双流体模型来研究活性向列流体和被动各向同性流体的受限混合物。 我们发现，如果锚定是平面的，拉伸性活性流体会优先积聚在边界上，而当锚定是垂直的时候，其边界浓度会降低。 如果活性流体是收缩性的，这些趋势则会相反。 我们认为，这种分选结果来自于向列序的梯度，并表明这种行为可以由施加的边界锚定或由活性流动引起的自发锚定驱动。 我们的结果可以通过微管-动力蛋白马达网络的实验进行验证，并可能与细胞群落或癌细胞球体中的边界分选有关。 显示英文摘要

摘要： We use a two-fluid model to study a confined mixture of an active nematic fluid and a passive isotropic fluid. We find that an extensile active fluid preferentially accumulates at a boundary if the anchoring is planar, whereas its boundary concentration decreases for homeotropic anchoring. These tendencies are reversed if the active fluid is contractile. We argue that the sorting results from gradients in the nematic order, and show that the behaviour can be driven by either imposed boundary anchoring or spontaneous anchoring induced by active flows. Our results can be tested by experiments on microtubule-kinesin motor networks, and may be relevant to sorting to the boundary in cell colonies or cancer spheroids.