Swelling and evaporation determine surface morphology of grafted hydrogel thin films - Archive ouverte HAL
Pré-Publication, Document De Travail Année : 2024

Swelling and evaporation determine surface morphology of grafted hydrogel thin films

Résumé

We experimentally study the formation of surface patterns in grafted hydrogel films of nanometer-to-micrometer thicknesses during imbibition-driven swelling followed by evaporation-driven shrinking. Creases are known to form at the hydrogel surface during swelling; the wavelength of the creasing pattern is proportional to the initial thickness of the hydrogel film with a logarithmic correction that depends on microscopic properties of the hydrogel. We find that, although the characteristic wavelength of the pattern is determined during swelling, the surface morphology can be significantly influenced by evaporation-induced shrinking. We observe that the elastocapillary length based on swollen mechanical properties gives a threshold thickness for a surface pattern formation, and consequently an important change in morphology.
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Dates et versions

hal-04721352 , version 1 (08-10-2024)

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Caroline Kopecz-Muller, Clémence Gaunand, Yvette Tran, Matthieu Labousse, Elie Raphael, et al.. Swelling and evaporation determine surface morphology of grafted hydrogel thin films. 2024. ⟨hal-04721352⟩
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