Issue 20, 2023

Effect of surface tension on elastocapillary wrinkling of interfacially adsorbed hydrogel disks with photothermally programmed swelling profiles

Abstract

In this work, we study the influence of surface tension on light-induced wrinkling of hydrogel disks containing patterned regions of photothermally-active gold nanoparticles at the air–water interface. The disks, which are initially radially stretched by the air–water surface tension, undergo wrinkling under illumination through a radially nonuniform photothermal deswelling. By tuning the surface tension of the surrounding air–water interface through variations in concentration of a poly(vinyl alcohol) surfactant, we observe a critical threshold for wrinkling, followed by a monotonic decrease in wrinkle number with decreasing surface tension. Finite element simulations performed to better understand this behavior reveal qualitatively similar trends as the experiments. The insights provided into elastocapillarity-mediated wrinkling may guide future efforts to control interfacial behaviour of reconfigurable and shape-morphing films.

Graphical abstract: Effect of surface tension on elastocapillary wrinkling of interfacially adsorbed hydrogel disks with photothermally programmed swelling profiles

Supplementary files

Article information

Article type
Paper
Submitted
01 jan 2023
Accepted
28 apr 2023
First published
12 mei 2023

Soft Matter, 2023,19, 3543-3550

Author version available

Effect of surface tension on elastocapillary wrinkling of interfacially adsorbed hydrogel disks with photothermally programmed swelling profiles

J. Kim, C. Chen, H. Kim, S. Kim and R. C. Hayward, Soft Matter, 2023, 19, 3543 DOI: 10.1039/D3SM00001J

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