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  Pinning-Induced Folding-Unfolding Asymmetry in Adhesive Creases

van Limbeek, M. A. J., Essink, M. H., Pandey, A., Snoeijer, J. H., & Karpitschka, S. A. (2021). Pinning-Induced Folding-Unfolding Asymmetry in Adhesive Creases. Physical Review Letters, 127: 028001. doi:10.1103/PhysRevLett.127.028001.

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van Limbeek, Michiel A. J.1, Autor           
Essink, Martin H., Autor
Pandey, Anupam, Autor
Snoeijer, Jacco H., Autor
Karpitschka, Stefan A.2, Autor           
Affiliations:
1Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063299              
2Group Fluidics in heterogeneous environments, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2466703              

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 Zusammenfassung: The compression of soft elastic matter and biological tissue can lead to creasing, an instability where a surface folds sharply into periodic self-contacts. Intriguingly, the unfolding of the surface upon releasing the strain is usually not perfect: small scars remain that serve as nuclei for creases during repeated compressions. Here we present creasing experiments with sticky polymer surfaces, using confocal microscopy, which resolve the contact line region where folding and unfolding occurs. It is found that surface tension induces a second fold, at the edge of the self-contact, which leads to a singular elastic stress and self-similar crease morphologies. However, these profiles exhibit an intrinsic folding-unfolding asymmetry that is caused by contact line pinning, in a way that resembles wetting of liquids on imperfect solids. Contact line pinning is therefore a key element of creasing: it inhibits complete unfolding and gives soft surfaces a folding memory.

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Sprache(n): eng - English
 Datum: 2021-07-092021
 Publikationsstatus: Erschienen
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 Ort, Verlag, Ausgabe: -
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 Identifikatoren: DOI: 10.1103/PhysRevLett.127.028001
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Titel: Physical Review Letters
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: -
Seiten: 6 Band / Heft: 127 Artikelnummer: 028001 Start- / Endseite: - Identifikator: ISSN: 0031-9007
ISSN: 1079-7114