Elastocapillary lifting and encapsulation of water by a triangular elastic film under gravity
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866910059972263936 |
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| author | Shibata, Kyoko Kanda, Hana Tanaka, Yoshimi Sumino, Yutaka |
| author_facet | Shibata, Kyoko Kanda, Hana Tanaka, Yoshimi Sumino, Yutaka |
| contents | We investigate the encapsulation of water by a thin elastic film as a minimal model of elastocapillary self-folding with fluid transport. An equilateral triangular polydimethylsiloxane film is lifted quasi-statically from a water surface, while its side length and thickness are systematically varied. Depending on these parameters, the film exhibits three distinct morphologies: folding, recoiling, and liquid encapsulation. We show that the observed morphology is selected by the competition between surface energy, gravitational energy of the liquid, and bending energy of the film. In particular, encapsulation occurs in a narrow parameter region corresponding to the intersection of the elastocapillary, elastogravity, and capillary length scales. This result provides a simple physical criterion for liquid encapsulation by elastic films, based on the balance of bending, capillary, and gravitational energies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_18824 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Elastocapillary lifting and encapsulation of water by a triangular elastic film under gravity Shibata, Kyoko Kanda, Hana Tanaka, Yoshimi Sumino, Yutaka Soft Condensed Matter We investigate the encapsulation of water by a thin elastic film as a minimal model of elastocapillary self-folding with fluid transport. An equilateral triangular polydimethylsiloxane film is lifted quasi-statically from a water surface, while its side length and thickness are systematically varied. Depending on these parameters, the film exhibits three distinct morphologies: folding, recoiling, and liquid encapsulation. We show that the observed morphology is selected by the competition between surface energy, gravitational energy of the liquid, and bending energy of the film. In particular, encapsulation occurs in a narrow parameter region corresponding to the intersection of the elastocapillary, elastogravity, and capillary length scales. This result provides a simple physical criterion for liquid encapsulation by elastic films, based on the balance of bending, capillary, and gravitational energies. |
| title | Elastocapillary lifting and encapsulation of water by a triangular elastic film under gravity |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2603.18824 |