论文标题
具有异化激光多普勒速度测定的致密悬浮液中活性物质的表征
Characterization of active matter in dense suspensions with heterodyne laser Doppler velocimetry
论文作者
论文摘要
我们提出了一种新颖的方法，用于表征稀释悬浮液和拥挤环境中主动物质的性质和性能。我们使用超杂化激光多普勒 - 弹维旋维法（SH-LDV）来研究在紫外线刷新下移动的催化活性Janus颗粒的大型集合。 SH-LDV促进了游泳速度和方向的无模型测定，并具有出色的合奏。此外，我们获得了催化活性分布的形成。此外，SH-LDV远离墙壁，并允许对多个散射贡献进行便捷的校正。因此，它允许在游泳者或游泳者在被动颗粒拥挤的环境中积极推动游泳者的集中悬浮液。我们通过一些选定的示例演示了该方法的多功能性和范围。我们预计SH-LDV补充了Estab所示的方法，并为在以前无法接近的边界条件下进行系统测量铺平了道路。
We present a novel approach for characterizing the properties and performance of active matter in dilute suspension as well as in crowded environments. We use Super-Heterodyne Laser-Doppler-Velocimetry (SH-LDV) to study large ensembles of catalytically active Janus particles moving under UV-illumination. SH-LDV facilitates a model-free determination of the swimming speed and direction, with excellent ensemble averaging. In addition we obtain in-formation on the distribution of the catalytic activity. Moreover, SH-LDV operates away from walls and permits a facile correction for multiple scattering contributions. It thus allows for stud-ies of concentrated suspensions of swimmers or of systems where swimmers propel actively in an environment crowded by passive particles. We demonstrate the versatility and the scope of the method with a few selected examples. We anticipate that SH-LDV complements estab-lished methods and paves the way for systematic measurements at previously inaccessible boundary conditions.
