Ultra-strong mechanical property and force-driven malleability of water-poor hydrogels
| Autor: | Wang Liao, Yu-Zhong Wang, Di Wang, Huaxiu Xu, Shimei Xu, Wen-Hui Rao, Yun Tan |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Nanocomposite Modulus 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials Colloid and Surface Chemistry Compressive strength Self-healing hydrogels Bound water Composite material Elongation 0210 nano-technology Water content Softening |
| Zdroj: | Journal of Colloid and Interface Science. 542:281-288 |
| ISSN: | 0021-9797 |
| Popis: | Hydrogels are known as soft and wet materials. Development of metal-like hydrogels with super strong and malleable properties is highly desirable as it allows for broader application and reprocessability. Here we report a dual nanocomposite hydrogel with peculiar mechanical properties in water-poor region. The gel with water content of 35% exhibits excellent recovery and fatigue resistance with elongation at break exceeding 800%, while the gel with 15 wt% of water content shows an ultra-high compressive strength and modulus of more than 1 GPa. The dual nanocomposite structure and bound water endowed the gel with high strength. Besides, the gel modulus can be easily switched by temperature change in a reversible way due to hybrid crosslinking network of the hydrogel in which physical network breaks and reforms rapidly while chemical network remains the gel state. So the gel shows a force-driven softening behavior and can be molded into different shapes due to reversible thermo-induced modulus decline. The softening behavior is also beneficial for the self-healing of the gel. The peculiar mechanical properties make the hydrogel a potential candidate for a new generation of advanced engineering materials. |
| Databáze: | OpenAIRE |
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