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- W4387614909 abstract "When a colloidal probe is forced through a viscoelastic fluid which is characterized by a long stress-relaxation time, the fluid is excited out of equilibrium. This is leading to a number of interesting effects including a non-trivial recoil of the probe when the driving force is removed. Here, we experimentally and theoretically investigate the transient recoil dynamics of non-spherical particles, i.e., colloidal dumbbells. In addition to a translational recoil of the dumbbells, we also find a pronounced angular reorientation which results from the relaxation of the surrounding fluid. Our findings are in good agreement with a Langevin description based on the symmetries of a director (dumbbell) as well as a microscopic bath-rod model. Remarkably, we find an instability with amplified fluctuations when the dumbbell is oriented perpendicular to the direction of driving. Our results demonstrate the complex behavior of non-spherical objects within a relaxing environment which are of immediate interest for the motion of externally but also self-driven asymmetric objects in viscoelastic fluids." @default.
- W4387614909 created "2023-10-14" @default.
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- W4387614909 date "2023-10-13" @default.
- W4387614909 modified "2023-10-18" @default.
- W4387614909 title "Memory-induced alignment of colloidal dumbbells" @default.
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- W4387614909 doi "https://doi.org/10.1038/s41598-023-44547-z" @default.
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