Controlling Droplets at the Tips of Fibers
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866915621968543744 |
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| author | He, Mengfei Hulikal, Samay Marquardt, Marianna Jiang, Hao Pandey, Anupam Zhang, Teng Santangelo, Christian D. Paulsen, Joseph D. |
| author_facet | He, Mengfei Hulikal, Samay Marquardt, Marianna Jiang, Hao Pandey, Anupam Zhang, Teng Santangelo, Christian D. Paulsen, Joseph D. |
| contents | Many complex wetting behaviors of fibrous materials are rooted in the behaviors of individual droplets attached to pairs of fibers. Here, we study the splitting of a droplet held between the tips of two cylindrical fibers. We discover a sharp transition between two post-rupture states, navigated by changing the angle between the rods, in agreement with our bifurcation analysis. Depinning of the bridge contact line can lead to a much larger asymmetry between the volume of liquid left on each rod. This second scenario enables the near-complete transfer of an aqueous glycerol droplet between two identical vinylpolysiloxane fibers. We leverage this response in a device that uses a ruck to pass a droplet along a train of fibers, a proof-of-concept for the geometric control of droplets on deformable, architected surfaces. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_09267 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Controlling Droplets at the Tips of Fibers He, Mengfei Hulikal, Samay Marquardt, Marianna Jiang, Hao Pandey, Anupam Zhang, Teng Santangelo, Christian D. Paulsen, Joseph D. Fluid Dynamics Soft Condensed Matter Many complex wetting behaviors of fibrous materials are rooted in the behaviors of individual droplets attached to pairs of fibers. Here, we study the splitting of a droplet held between the tips of two cylindrical fibers. We discover a sharp transition between two post-rupture states, navigated by changing the angle between the rods, in agreement with our bifurcation analysis. Depinning of the bridge contact line can lead to a much larger asymmetry between the volume of liquid left on each rod. This second scenario enables the near-complete transfer of an aqueous glycerol droplet between two identical vinylpolysiloxane fibers. We leverage this response in a device that uses a ruck to pass a droplet along a train of fibers, a proof-of-concept for the geometric control of droplets on deformable, architected surfaces. |
| title | Controlling Droplets at the Tips of Fibers |
| topic | Fluid Dynamics Soft Condensed Matter |
| url | https://arxiv.org/abs/2504.09267 |