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A Magnetically Actuated Superhydrophobic Ratchet Surface for Droplet Manipulation
| Content Provider | MDPI |
|---|---|
| Author | Son, Changhee Ji, Bingqiang Park, Junkyu Feng, Jie Kim, Seok |
| Copyright Year | 2021 |
| Description | A water droplet dispensed on a superhydrophobic ratchet surface is formed into an asymmetric shape, which creates a Laplace pressure gradient due to the contact angle difference between two sides. This work presents a magnetically actuated superhydrophobic ratchet surface composed of nanostructured black silicon strips on elastomer ridges. Uniformly magnetized NdFeB layers sputtered under the black silicon strips enable an external magnetic field to tilt the black silicon strips and form a superhydrophobic ratchet surface. Due to the dynamically controllable Laplace pressure gradient, a water droplet on the reported ratchet surface experiences different forces on two sides, which are explored in this work. Here, the detailed fabrication procedure and the related magnetomechanical model are provided. In addition, the resultant asymmetric spreading of a water droplet is studied. Finally, droplet impact characteristics are investigated in three different behaviors of deposition, rebound, and penetration depending on the impact speed. The findings in this work are exploitable for further droplet manipulation studies based on a dynamically controllable superhydrophobic ratchet surface. |
| Starting Page | 325 |
| e-ISSN | 2072666X |
| DOI | 10.3390/mi12030325 |
| Journal | Micromachines |
| Issue Number | 3 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-03-19 |
| Access Restriction | Open |
| Subject Keyword | Micromachines Manufacturing Engineering Ratchet Surface Superhydrophobic Laplace Pressure Droplet Manipulation Ndfeb |
| Content Type | Text |
| Resource Type | Article |
