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Issue 23, 2016
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Coupled instabilities of surface crease and bulk bending during fast free swelling of hydrogels

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Abstract

Most studies on hydrogel swelling instability have been focused on a constrained boundary condition. In this paper, we studied the mechanical instability of a piece of disc-shaped hydrogel during free swelling. The fast swelling of the gel induces two swelling mismatches; a surface-inner layer mismatch and an annulus-disc mismatch, which lead to the formation of a surface crease pattern and a saddle-like bulk bending, respectively. For the first time, a stripe-like surface crease that is at a right angle on the two surfaces of the gel was observed. This stripe pattern is related to the mechanical coupling of surface instability and bulk bending, which is justified by investigating the swelling-induced surface pattern on thin hydrogel sheets fixed onto a saddle-shaped substrate prior to swelling. A theoretical mechanism based on an energy model was developed to show an anisotropic stripe-like surface crease pattern on a saddle-shaped surface. These results might be helpful to develop novel strategies for controlling crease patterns on soft and wet materials by changing their three-dimensional shape.

Graphical abstract: Coupled instabilities of surface crease and bulk bending during fast free swelling of hydrogels

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Publication details

The article was received on 07 Mar 2016, accepted on 11 Apr 2016 and first published on 12 Apr 2016


Article type: Paper
DOI: 10.1039/C6SM00578K
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Soft Matter, 2016,12, 5081-5088
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    Coupled instabilities of surface crease and bulk bending during fast free swelling of hydrogels

    R. Takahashi, Y. Ikura, D. R. King, T. Nonoyama, T. Nakajima, T. Kurokawa, H. Kuroda, Y. Tonegawa and J. P. Gong, Soft Matter, 2016, 12, 5081
    DOI: 10.1039/C6SM00578K

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