Geometrically Templated Dynamic Wrinkling from Suspended Poly(vinyl alcohol) Soap Films
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916646954729472 |
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| author | Gao, Yuchong Chi, Yinding Patel, Mohit Jin, Lishuai Liu, Jiaqi Brun, Pierre-Thomas Yang, Shu |
| author_facet | Gao, Yuchong Chi, Yinding Patel, Mohit Jin, Lishuai Liu, Jiaqi Brun, Pierre-Thomas Yang, Shu |
| contents | Wrinkling is commonly observed as mechanical instability when a stiff thin film bound on a compliant thick substrate undergoes in-plane compression exceeding a threshold. Despite significant efforts to create a broad range of surface patterns via wrinkling, little has been studied about a dynamic and transient wrinkling process, where a suspended polymer thin film undergoes liquid-to-solid phase transitions. Here, a spontaneous wrinkling process is reported, when drying poly(vinyl alcohol) (PVA) soap films suspended on 3D printed wireframes with near zero or negative Gaussian curvatures. As water evaporates, a thickness gradient across the sample is developed, leading to non-uniform drying rates, and a concentration gradient between the inner and outer sides (exposed to air) of the suspended PVA soap film induces a differential osmotic pressure. Together, these effects contribute to an in-plane compressive stress, leading to the formation of surface wrinkles, whose growth is guided by the geometry of the frame. Importantly, the wrinkles evolve dynamically: the wavelength and number of the wrinkles can be tuned by altering the concentration of the PVA aqueous solutions, the initial mass, the relative humidity of the drying environment; the patterns of the resulting wrinkles can be programmed by the geometry of the wireframe. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_06065 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Geometrically Templated Dynamic Wrinkling from Suspended Poly(vinyl alcohol) Soap Films Gao, Yuchong Chi, Yinding Patel, Mohit Jin, Lishuai Liu, Jiaqi Brun, Pierre-Thomas Yang, Shu Soft Condensed Matter Applied Physics Wrinkling is commonly observed as mechanical instability when a stiff thin film bound on a compliant thick substrate undergoes in-plane compression exceeding a threshold. Despite significant efforts to create a broad range of surface patterns via wrinkling, little has been studied about a dynamic and transient wrinkling process, where a suspended polymer thin film undergoes liquid-to-solid phase transitions. Here, a spontaneous wrinkling process is reported, when drying poly(vinyl alcohol) (PVA) soap films suspended on 3D printed wireframes with near zero or negative Gaussian curvatures. As water evaporates, a thickness gradient across the sample is developed, leading to non-uniform drying rates, and a concentration gradient between the inner and outer sides (exposed to air) of the suspended PVA soap film induces a differential osmotic pressure. Together, these effects contribute to an in-plane compressive stress, leading to the formation of surface wrinkles, whose growth is guided by the geometry of the frame. Importantly, the wrinkles evolve dynamically: the wavelength and number of the wrinkles can be tuned by altering the concentration of the PVA aqueous solutions, the initial mass, the relative humidity of the drying environment; the patterns of the resulting wrinkles can be programmed by the geometry of the wireframe. |
| title | Geometrically Templated Dynamic Wrinkling from Suspended Poly(vinyl alcohol) Soap Films |
| topic | Soft Condensed Matter Applied Physics |
| url | https://arxiv.org/abs/2503.06065 |