Macroscopic Self‐Evolution of Dynamic Hydrogels to Create Hollow Interiors
| Autor: | Jun Feng, Lu Han, Guangyin Jing, Yijun Zheng, Xu Deng, Roxanne Engstler, Aránzazu del Campo, Jiaxi Cui, Hao Luo, Lulu Xue |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Field (physics) Dynamic Hydrogels macroscopic self-evolution Nanotechnology 010402 general chemistry 01 natural sciences Catalysis hydrophobic effects Hydrophobic effect hollow interiors Molecule Alkyl chemistry.chemical_classification 010405 organic chemistry Communication technology industry and agriculture General Chemistry Polymer General Medicine gels Communications 0104 chemical sciences chemistry Helix Self-healing hydrogels SPHERES |
| Zdroj: | Angewandte Chemie (International Ed. in English) |
| ISSN: | 1521-3757 0044-8249 |
| Popis: | A solid‐to‐hollow evolution in macroscopic structures is challenging in synthetic materials. A fundamentally new strategy is reported for guiding macroscopic, unidirectional shape evolution of materials without compromising the material's integrity. This strategy is based on the creation of a field with a “swelling pole” and a “shrinking pole” to drive polymers to disassemble, migrate, and resettle in the targeted region. This concept is demonstrated using dynamic hydrogels containing anchored acrylic ligands and hydrophobic long alkyl chains. Adding water molecules and ferric ions (Fe3+) to induce a swelling–shrinking field transforms the hydrogels from solid to hollow. The strategy is versatile in the generation of various closed hollow objects (for example, spheres, helix tubes, and cubes with different diameters) for different applications. A solid dynamic hydrogel prepared by micellar copolymerization of stearyl methacrylate, acrylamide, and acrylate acid in the presence of sodium dodecyl sulfate surfactant macroscopically self‐transforms to form a hollow interior. The hydrogel mimics the function of living systems, which can adapt to environmental changes as part of their biofunctions. |
| Databáze: | OpenAIRE |
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