Moving wetting ridges on ultrasoft gels

Jeon, Hansol; Chao, Youchuang; Karpitschka, Stefan

Moving wetting ridges on ultrasoft gels

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Jeon_2-kn6rs446foh88.pdfGröße: 1.48 MBDownloads: 3

Datum

2023

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Physical Review E. American Physical Society (APS). 2023, 108(2), 024611. ISSN 2470-0045. eISSN 2470-0053. Available under: doi: 10.1103/physreve.108.024611

Zusammenfassung

The surface mechanics of soft solids are important in many natural and technological applications. In this context, static and dynamic wetting of soft polymer gels has emerged as a versatile model system. Recent experimental observations have sparked controversial discussions of the underlying theoretical description, ranging from concentrated elastic forces over strain-dependent solid surface tensions to poroelastic deformations or the capillary extraction of liquid components in the gel. Here we present measurements of the shapes of moving wetting ridges with high spatiotemporal resolution, combining distinct wetting phases (water, FC-70, air) on different ultrasoft PDMS gels (∼100Pa). Comparing our experimental results to the asymptotic behavior of linear viscoelastocapillary theory in the vicinity of the ridge, we separate reliable measurements from potential resolution artifacts. Remarkably, we find that the commonly used elastocapillary scaling fails to collapse the ridge shapes, but, for small normal forces, yields a viable prediction of the dynamic ridge angles. We demonstrate that neither of the debated theoretical models delivers a quantitative description, while the capillary extraction of an oil skirt appears to be the most promising.

Fachgebiet (DDC)

530 Physik

Zitieren

ISO 690

JEON, Hansol, Youchuang CHAO, Stefan KARPITSCHKA, 2023. Moving wetting ridges on ultrasoft gels. In: Physical Review E. American Physical Society (APS). 2023, 108(2), 024611. ISSN 2470-0045. eISSN 2470-0053. Available under: doi: 10.1103/physreve.108.024611

BibTex

@article{Jeon2023Movin-67759,
  year={2023},
  doi={10.1103/physreve.108.024611},
  title={Moving wetting ridges on ultrasoft gels},
  number={2},
  volume={108},
  issn={2470-0045},
  journal={Physical Review E},
  author={Jeon, Hansol and Chao, Youchuang and Karpitschka, Stefan},
  note={Article Number: 024611}
}

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