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PreprintCC BYChemRxiv

Superhydrophobic-Like Complete Rebound of Impacting Water Droplets on a Smooth Oleic- Acid-Coated Phenyl-Silica Surface

  • Dai Watanabe1
  • Keita Niikura1
  • Youfeng Yue2
  • Kengo Manabe1,3
  1. 1Department of Mechanical Engineering, Yokohama National University, Tokiwadai 79-5, Hodogaya-Ku, Yokohama, Kanagawa, Japan, 240-8501
  2. 2Core Electronics Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST, Higashi 1-1-1, Tsukuba, Ibaraki, Japan, 305-8565
  3. 3Graduate School of Engineering Science, Yokohama National University, Tokiwadai 79-5, Hodogaya-Ku, Yokohama, Kanagawa, Japan, 240-8501
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Abstract

We report impact-induced water-droplet rebound on a nanoscopically smooth phenyl-silica surface bearing an oleic-acid liquid layer with a nominal cast-equivalent thickness of ≈1 µm, retained on the substrate through interactions previously attributed to COOH–π association. High-speed imaging (5000 fps) of 10 µL water droplets resolves complete rebound at all sampled conditions from Weber number (𝑊𝑒) = 0.69 to 3.99 and partial rebound with satellite ejection at 𝑊𝑒 = 6.03 and 7.14; a near-zero-impact reference showed no liftoff during the recorded interval. The apex-based rebound proxy (𝑒apex) varied nonmonotonically, reaching 0.72 ± 0.02, whereas the apparent residence time of 16–21 ms showed no systematic dependence on 𝑊𝑒 and remained close to the inertial-capillary timescale. These kinematics are comparable to rebound regimes reported for smooth solids and liquid interfaces. Entrained-gas-film dynamics and the response of the oleic-acid layer are discussed as mechanistic hypotheses, while neither gas-film continuity nor lubricant redistribution was directly resolved. The results establish rapid impact-induced water shedding on a smooth, texture-free oleic-acid-coated interface and motivate future tests of lubricant retention under repeated water impact.

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Cite

BibTeXRIS
BibTeX
@misc{watanabe2026superhydrophobiclike,
  title = {{Superhydrophobic-Like Complete Rebound of Impacting Water Droplets on a Smooth Oleic- Acid-Coated Phenyl-Silica Surface}},
  author = {Dai Watanabe and Keita Niikura and Youfeng Yue and Kengo Manabe},
  howpublished = {ChemRxiv},
  year = {2026},
  month = sep,
  doi = {10.26434/chemrxiv.15008504/v1},
  url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008504/v1},
  note = {CC BY},
}
RIS
TY  - UNPB
TI  - Superhydrophobic-Like Complete Rebound of Impacting Water Droplets on a Smooth Oleic- Acid-Coated Phenyl-Silica Surface
AU  - Dai Watanabe
AU  - Keita Niikura
AU  - Youfeng Yue
AU  - Kengo Manabe
PY  - 2026
DA  - 2026/09/08
PB  - ChemRxiv
DO  - 10.26434/chemrxiv.15008504/v1
UR  - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008504/v1
AB  - We report impact-induced water-droplet rebound on a nanoscopically smooth phenyl-silica surface bearing an oleic-acid liquid layer with a nominal cast-equivalent thickness of ≈1 µm, retained on the substrate through interactions previously attributed to COOH–π association. High-speed imaging (5000 fps) of 10 µL water droplets resolves complete rebound at all sampled conditions from Weber number (𝑊𝑒) = 0.69 to 3.99 and partial rebound with satellite ejection at 𝑊𝑒 = 6.03 and 7.14; a near-zero-impact reference showed no liftoff during the recorded interval. The apex-based rebound proxy (𝑒apex) varied nonmonotonically, reaching 0.72 ± 0.02, whereas the apparent residence time of 16–21 ms showed no systematic dependence on 𝑊𝑒 and remained close to the inertial-capillary timescale. These kinematics are comparable to rebound regimes reported for smooth solids and liquid interfaces. Entrained-gas-film dynamics and the response of the oleic-acid layer are discussed as mechanistic hypotheses, while neither gas-film continuity nor lubricant redistribution was directly resolved. The results establish rapid impact-induced water shedding on a smooth, texture-free oleic-acid-coated interface and motivate future tests of lubricant retention under repeated water impact.
ER  -