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

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Tough high modulus hydrogels derived from carbon-nitride via an ethylene glycol co-solvent route†
Soft Matter ( IF 2.9 ) Pub Date : 2018-03-13 00:00:00 , DOI: 10.1039/c8sm00232k
Baris Kumru _{1,

2,

3,

4} , Valerio Molinari _{1,

2,

3,

4} , Menny Shalom _{1,

2,

3,

4,

5} , Markus Antonietti _{1,

2,

3,

4} , Bernhard V. K. J. Schmidt _{1,

2,

3,

4}

Affiliation

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.

中文翻译：

坚韧的高模量水凝胶，通过乙二醇共溶剂途径由碳氮化物制成†

石墨氮化碳（g-CN）的高浓度配方被用作水凝胶的光引发剂和增强剂。为了整合大量的g-CN，将乙二醇（EG）用作形成凝胶的助溶剂，可稳定分散高达4 wt％的g-CN。之后，可以很容易地通过交换溶剂得到纯净的水凝胶。多种凝胶具有极高的储能模量（凝胶高达650 kPa，水凝胶高达720 kPa）和压缩模量（4 wt％g-CN EG凝胶高达9.45 MPa，4 wt％g-CN水凝胶高达3.45 MPa）。在至少20个循环中观察到完全恢复而没有能量损失。此外，可以利用具有期望形状的光掩模以空间控制的方式进行凝胶形成。因此，所提出的方法使得能够通过光学平版印刷术形成具有与天然软骨和肌腱非常相似的优异机械性能的杂化凝胶，并为光催化，生物医学植入物和涂料的增材制造中的未来应用打开了机会。

更新日期：2018-03-13

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