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arXiv 2101.02499cond-mat.softphysics.chem-ph
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活性球体引发马朗尼流,驱动集体动力学

Active spheres induce Marangoni flows that drive collective dynamics

Martin Wittmann (contributed equally) Technical University Dresden, Zellescher Weg 19, DE-01069 Dresden, Germany Mihail N. Popescu (contributed equally) ORCID: 0000-0002-1102-7538 Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, D-70569 Stuttgart, Germany Alvaro Dom \'i nguez (corresponding author) ORCID: 0000-0002-8529-9667 F \'i sica Te \'o rica, Universidad de Sevilla, Apdo. 1065, 41080 Sevilla, Spain Instituto Carlos I de F \'i sica Te \'o rica y Computacional, 18071 Granada, Spain Juliane Simmchen (corresponding author) ORCID: 0000-0001-9073-9770 Technical University Dresden, Zellescher Weg 19, DE-01069 Dresden, Germany Tel.: +49 351 463-37433 Fax: +49 351 463-37164

Martin Wittmann, Mihail N. Popescu, Alvaro Domínguez, Juliane Simmchen

AI总结:

活性TiO₂粒子在油水界面通过光化学反应诱导马朗尼流,产生集体运动,其动态受粒子覆盖率影响。

摘要:

对于处于流体界面的化学活性粒子单层,预测集体动力学会因活动诱导的马朗尼流而出现,即使粒子本身不具有自推进能力。本文通过使用位于油水界面的球形对称活性TiO₂粒子单层(有或无非离子型表面活性剂)来检验这一预测。由于球形对称性,单个粒子本身不具有自推进能力。然而,由光化学燃料降解产生的梯度会引发长程马朗尼流。在加入表面活性剂的情况下,我们确实观察到了集体运动的出现,其动态依赖于单层的粒子覆盖率。实验观测在简单的理论平均场模型框架内进行了讨论。

英文摘要:

For monolayers of chemically active particles at a fluid interface, collective dynamics are predicted to arise owing to activity-induced Marangoni flow even if the particles are not self-propelled. Here we test this prediction by employing a monolayer of spherically symmetric active TiO_2 particles located at an oil-water interface with or without addition of a non-ionic surfactant. Due to the spherical symmetry, an individual particle does not self-propel. However, the gradients produced by the photochemical fuel degradation give rise to long-ranged Marangoni flows. For the case in which surfactant is added to the system, we indeed observe the emergence of collective motion, with dynamics dependent on the particle coverage of the monolayer. The experimental observations are discussed within the framework of a simple theoretical mean field model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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