Elastocapillary sequential fluid capture in hummingbird-inspired grooved sheets
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2024
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866910648981520384 |
|---|---|
| author | Siéfert, Emmanuel Scheid, Benoit Brau, Fabian Cappello, Jean |
| author_facet | Siéfert, Emmanuel Scheid, Benoit Brau, Fabian Cappello, Jean |
| contents | Passive and effective fluid capture and transport at small scale is crucial for industrial and medical applications, especially for the realisation of point-of-care tests. Performing these tests involves several steps including biological fluid capture, aliquoting, reaction with reagents at the fluid-device interface, and reading of the results. Ideally, these tests must be fast and offer a large surface-to-volume ratio to achieve rapid and precise diagnostics with a reduced amount of fluid. Such constraints are often contradictory as a high surface-to-volume ratio implies a high hydraulic resistance and hence a decrease in the flow rate. Inspired by the feeding mechanism of hummingbirds, we propose a frugal fluid capture device that takes advantage of elastocapillary deformations to enable concomitant fast liquid transport, aliquoting, and high confinement in the deformed state. The hierarchical design of the device - that consists in vertical grooves stacked on an elastic sheet - enables a two-step sequential fluid capture. Each unit groove mimics the hummingbird's tongue and closes due to capillary forces when a wetting liquid penetrates, yielding the closure of the whole device in a tubular shape, where additional liquid is captured. Combining elasticity, capillarity, and viscous flow, we rationalise the fluid-structure interaction at play both when liquid is scarce - end dipping and capillary rise - and abundant - full dipping. By functionalising the surface of the grooves such a passive device can concomitantly achieve all the steps of point-of-care tests, opening the way for the design of optimal devices for fluid capture and transport in microfluidics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_10461 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Elastocapillary sequential fluid capture in hummingbird-inspired grooved sheets Siéfert, Emmanuel Scheid, Benoit Brau, Fabian Cappello, Jean Fluid Dynamics Materials Science Soft Condensed Matter Passive and effective fluid capture and transport at small scale is crucial for industrial and medical applications, especially for the realisation of point-of-care tests. Performing these tests involves several steps including biological fluid capture, aliquoting, reaction with reagents at the fluid-device interface, and reading of the results. Ideally, these tests must be fast and offer a large surface-to-volume ratio to achieve rapid and precise diagnostics with a reduced amount of fluid. Such constraints are often contradictory as a high surface-to-volume ratio implies a high hydraulic resistance and hence a decrease in the flow rate. Inspired by the feeding mechanism of hummingbirds, we propose a frugal fluid capture device that takes advantage of elastocapillary deformations to enable concomitant fast liquid transport, aliquoting, and high confinement in the deformed state. The hierarchical design of the device - that consists in vertical grooves stacked on an elastic sheet - enables a two-step sequential fluid capture. Each unit groove mimics the hummingbird's tongue and closes due to capillary forces when a wetting liquid penetrates, yielding the closure of the whole device in a tubular shape, where additional liquid is captured. Combining elasticity, capillarity, and viscous flow, we rationalise the fluid-structure interaction at play both when liquid is scarce - end dipping and capillary rise - and abundant - full dipping. By functionalising the surface of the grooves such a passive device can concomitantly achieve all the steps of point-of-care tests, opening the way for the design of optimal devices for fluid capture and transport in microfluidics. |
| title | Elastocapillary sequential fluid capture in hummingbird-inspired grooved sheets |
| topic | Fluid Dynamics Materials Science Soft Condensed Matter |
| url | https://arxiv.org/abs/2410.10461 |