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Droplets on a non-textured surface typically exhibit a monostable wetting state, known as Young state. Here, we show that droplets can exhibit bistability without surface texture by tuning molecular interactions. We investigated the behavior of water droplets on a smooth substrate when immersed in oil. The oil contains hydrophilic interaction components, and their hydrophobic–hydrophilic balance was systematically varied. For oils with a specific hydrophobic–hydrophilic balance, droplet states bifurcate between repellent or sticky depending on the order of droplet casting and oil immersion. These states are neither transient nor one-off, because molecular interactions create an energetic barrier separating the two states rather than surface textures. Under other oil conditions, the droplet remains monostable, either repellent or sticky, regardless of the order. This work advances the fundamental understanding of molecular effects on droplet behavior and expands surface design strategies in functional materials without compromising mechanical durability.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: bistable wetting states, hydrophile–lipophile balance (HLB), hydroxyl-terminated polydimethylsiloxane, non-textured surface, sticky/repellentstates

刊行年月日: 2026-04-02

出版者: Wiley

掲載誌:

• Advanced Materials Interfaces (ISSN: 21967350) vol. 13 issue. 10 e70495

研究助成金:

• Japan Science and Technology Agency

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1002/admi.70495

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更新時刻: 2026-05-22 13:21:13 +0900

MDRでの公開時刻: 2026-05-22 14:28:18 +0900