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Issue 14, 2018
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Tough high modulus hydrogels derived from carbon-nitride via an ethylene glycol co-solvent route

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Abstract

High concentration formulations of graphitic carbon nitride (g-CN) are utilized as photoinitiator and reinforcer for hydrogels. In order to integrate significant amounts of g-CN, ethylene glycol (EG) is employed as a co-solvent for the gel formation, which enables stable dispersion of up to 4 wt% g-CN. Afterwards, EG can be removed easily via solvent exchange to afford pure hydrogels. The diverse gels possess remarkably high storage moduli (up to 650 kPa for gels and 720 kPa for hydrogels) and compression moduli (up to 9.45 MPa for 4 wt% g-CN EG gel and 3.45 MPa for 4 wt% g-CN hydrogel). Full recovery without energy loss is observed for at least 20 cycles. Moreover, gel formation can be performed in a spatially controlled way utilizing photomasks with desired shapes. Therefore, the suggested method enables formation of hybrid gels by optical lithography with outstanding mechanical properties very similar to natural cartilage and tendon, and opens up opportunities for future applications in photocatalysis, additive manufacturing of biomedical implants and coating materials.

Graphical abstract: Tough high modulus hydrogels derived from carbon-nitride via an ethylene glycol co-solvent route

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Supplementary files

Article information


Submitted
31 Jan 2018
Accepted
11 Mar 2018
First published
13 Mar 2018

This article is Open Access

Soft Matter, 2018,14, 2655-2664
Article type
Paper

Tough high modulus hydrogels derived from carbon-nitride via an ethylene glycol co-solvent route

B. Kumru, V. Molinari, M. Shalom, M. Antonietti and B. V. K. J. Schmidt, Soft Matter, 2018, 14, 2655
DOI: 10.1039/C8SM00232K

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