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Issue 35, 2018
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A contactless approach for monitoring the mechanical properties of swollen hydrogels

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Abstract

Using a customized ultrasound setup we investigate the feasibility of using a contactless approach to study the bulk mechanical properties of swollen hydrogels. The study involved two different hydrogels, gelatin methacrylate (GelMa) and green algae extract methacrylate (GAEM), which were prepared to provide materials with varying modulus and different swelling properties. Two approaches have been developed. In the first case, ultrasound was compared to Young's modulus measured by indentation. It was found that can be linearly related to indentation modulus values only when the hydrogel swelling ratio is taken into account. In the second approach, an exponential dependency between swelled thickness and indentation modulus was found. This is representative for each hydrogel and purification method in addition to being independent of the conditions used within the toughness range explored. The results of this study indicate that a simple thickness measurement via the proposed approach can provide a direct relationship to Young's modulus upon calibration.

Graphical abstract: A contactless approach for monitoring the mechanical properties of swollen hydrogels

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Publication details

The article was received on 15 Jun 2018, accepted on 15 Aug 2018 and first published on 22 Aug 2018


Article type: Paper
DOI: 10.1039/C8SM01227J
Citation: Soft Matter, 2018,14, 7228-7236
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    A contactless approach for monitoring the mechanical properties of swollen hydrogels

    A. Ruland, X. Chen, A. Khansari, C. D. Fay, S. Gambhir, Z. Yue and G. G. Wallace, Soft Matter, 2018, 14, 7228
    DOI: 10.1039/C8SM01227J

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