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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Hendy, Shaun C. Willmott, Geoff R. Neto, Chiara |
| Copyright Year | 2011 |
| Abstract | We present direct experimental evidence that water droplets can spontaneously penetrate non-wetting capillaries, driven by the action of Laplace pressure due to high droplet curvature. Using high-speed optical imaging, microcapillaries of radius 50 μm to 150 μm, and water microdroplets of average radius between 100 μm and 1900 μm, we demonstrate that there is a critical droplet radius below which water droplets can be taken up by hydrophobised glass and non-wetting polytetrafluoroethylene (PTFE) capillaries. The rate of capillary uptake is shown to depend strongly on droplet size, with smaller droplets penetrating the tube more quickly. Droplet size is also shown to influence meniscus motion in a pre-filled non-wetting capillary, and quantitative measurements of this effect result in a derived water-PTFE static contact angle between 96° and 114°. Our measurements confirm recent theoretical predictions and simulations for metal nanodroplets penetrating non-wetting carbon nanotubes (CNTs). The results are relevant to a wide range of technological applications, such as microfluidic devices, ink-jet printing, and the penetration of fluids in porous materials. |
| Starting Page | 2357 |
| Ending Page | 2363 |
| Page Count | 7 |
| File Format | HTM / HTML PDF |
| ISSN | 1744683X |
| Volume Number | 7 |
| Issue Number | 6 |
| Journal | Soft Matter |
| DOI | 10.1039/c0sm00574f |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | Capillary action Pierre-Simon Laplace Carbon nanotube Polytetrafluoroethylene Meniscus Medical optical imaging Micrometre Contact angle Curvature Laplace |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Condensed Matter Physics |
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