Bidirectional Zigzag Growth from Clusters of Active Colloidal Shakers
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866911844562632704 |
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| author | Junot, Gaspard González, Andrés Javier Manzano Tierno, Pietro |
| author_facet | Junot, Gaspard González, Andrés Javier Manzano Tierno, Pietro |
| contents | Driven or self-propelling particles moving in viscoelastic fluids recently emerge as novel class of active systems showing a complex yet rich set of phenomena due to the non-Newtonian nature of the dispersing medium. Here we investigate the one-dimensional growth of clusters made of active colloidal shakers, which are realized by oscillating magnetic rotors dispersed within a viscoelastic fluid and at different concentration of the dissolved polymer. These magnetic particles when actuated by an oscillating field display a flow profile similar to that of a shaker force dipole, i.e. without any net propulsion. We design a protocol to assemble clusters of colloidal shakers and induce their controlled expansion into elongated zigzag structures. We observe a power law growth of the mean chain length and use theoretical arguments to explain the measured $1/3$ exponent. These arguments agree well with both experiments and particle based numerical simulations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_02939 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Bidirectional Zigzag Growth from Clusters of Active Colloidal Shakers Junot, Gaspard González, Andrés Javier Manzano Tierno, Pietro Soft Condensed Matter Driven or self-propelling particles moving in viscoelastic fluids recently emerge as novel class of active systems showing a complex yet rich set of phenomena due to the non-Newtonian nature of the dispersing medium. Here we investigate the one-dimensional growth of clusters made of active colloidal shakers, which are realized by oscillating magnetic rotors dispersed within a viscoelastic fluid and at different concentration of the dissolved polymer. These magnetic particles when actuated by an oscillating field display a flow profile similar to that of a shaker force dipole, i.e. without any net propulsion. We design a protocol to assemble clusters of colloidal shakers and induce their controlled expansion into elongated zigzag structures. We observe a power law growth of the mean chain length and use theoretical arguments to explain the measured $1/3$ exponent. These arguments agree well with both experiments and particle based numerical simulations. |
| title | Bidirectional Zigzag Growth from Clusters of Active Colloidal Shakers |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2402.02939 |