How Spontaneous Electrowetting and Surface Charge affect Drop Motion
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arXiv
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| Auteurs principaux: | , , , , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866910059890475008 |
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| author | Hinduja, Chirag Leibauer, Benjamin Chaurasia, Rishi Knorr, Nikolaus Ratschow, Aaron D. Singh, Shalini Butt, Hans-Jürgen Berger, Rüdiger |
| author_facet | Hinduja, Chirag Leibauer, Benjamin Chaurasia, Rishi Knorr, Nikolaus Ratschow, Aaron D. Singh, Shalini Butt, Hans-Jürgen Berger, Rüdiger |
| contents | Water drops sliding on hydrophobic surfaces spontaneously separate charges at their rear. It is unclear how this charge separation affects the contact angles of a sliding drop. We slide grounded and insulated drops on hydrophobic surfaces at low capillary numbers (\leq 10^{-4}). We find that drop charge leads to spontaneous electrowetting, which decreases the contact angles. Additionally, the deposited charges lead to a surface charge effect and decrease the contact angle. Both phenomena compensate each other at the receding contact line, resulting in an insignificant change in the receding contact angle of a sliding drop. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_03362 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | How Spontaneous Electrowetting and Surface Charge affect Drop Motion Hinduja, Chirag Leibauer, Benjamin Chaurasia, Rishi Knorr, Nikolaus Ratschow, Aaron D. Singh, Shalini Butt, Hans-Jürgen Berger, Rüdiger Fluid Dynamics Soft Condensed Matter Water drops sliding on hydrophobic surfaces spontaneously separate charges at their rear. It is unclear how this charge separation affects the contact angles of a sliding drop. We slide grounded and insulated drops on hydrophobic surfaces at low capillary numbers (\leq 10^{-4}). We find that drop charge leads to spontaneous electrowetting, which decreases the contact angles. Additionally, the deposited charges lead to a surface charge effect and decrease the contact angle. Both phenomena compensate each other at the receding contact line, resulting in an insignificant change in the receding contact angle of a sliding drop. |
| title | How Spontaneous Electrowetting and Surface Charge affect Drop Motion |
| topic | Fluid Dynamics Soft Condensed Matter |
| url | https://arxiv.org/abs/2602.03362 |