A general strategy for strengthening and toughening physical hydrogels via anti-Hofmeister sequence solid salting-out

文献类型： 外文期刊

第一作者： Lu, Bai-Chuan

作者： Lu, Bai-Chuan;Hu, Run-Ze;Guo, Shi-Wen;Zong, Chen-Man;Yao, Xiao-Hui;Wang, Xue-Yang;Chen, Tao;Zhang, Dong-Yang;Lu, Bai-Chuan;Hu, Run-Ze;Guo, Shi-Wen;Zong, Chen-Man;Yao, Xiao-Hui;Wang, Xue-Yang;Chen, Tao;Zhang, Dong-Yang;Liu, En-Jiang;Lu, Ding-Ding;Wan, Ai-Jun

作者机构：

期刊名称：GREEN CHEMISTRY （ 影响因子：9.2； 五年影响因子：9.8 ）

ISSN： 1463-9262

年卷期： 2025 年 27 卷 24 期

页码：

收录情况： SCI

摘要： In recent years, many strategies have been developed to enhance the mechanical properties of hydrogels. However, due to the complex process, the addition of non-green crosslinking agents and the use of high concentration salt solutions these strategies lead to increased costs, resource waste and environmental pollution. In addition, the synergistic improvement of strength and toughness of hydrogels is still challenging. Herein, a general green strategy of solid salting-out to improve the strength and toughness of physical hydrogels is reported. This strategy can induce the directional transfer of water molecules in the hydrogel, promoting the close layer-by-layer self-assembly of the PVA molecular chain. Compared with liquid salting-out, solid salting-out has a more significant improvement in the strength of hydrogels, and solid salt blocks can be recycled and reused. A PVA hydrogel prepared by the solid salting-out method showed both high strength and toughness that were 1962- and 1900-fold those from before solid salting-out, respectively. The strength and toughness of the hydrogel can be further improved to 109.06 MPa and 125.73 MJ m-3, respectively, by inducing the collaborative self-assembly of cellulose nanofibers and PVA molecular chains. As a general strategy, solid salting-out could enhance various physical hydrogels composed of materials such as silk, gelatin, and cotton staple cellulose. Thus, this study not only provides a simple method for the strengthening and toughening of physical hydrogels but also has potential applications in the field of biological implants because of the favorable biocompatibility of the prepared hydrogels.

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