Macroscopic Self-Evolution of Dynamic Hydrogels to Create Hollow Interiors
Macroscopic Self-Evolution of Dynamic Hydrogels to Create Hollow Interiors
复制标题
动态水凝胶的宏观自我进化创造中空内部
DOI：
10.1002/anie.201913574
复制
发表时间：
2020-03-27
影响因子：
16.6
通讯作者：
Cui, Jiaxi
中科院分区：
文献类型：
--
作者：
Han, Lu;Zheng, Yijun;Cui, Jiaxi
宏观结构中固体到中空的演变在合成材料中具有挑战性。一个全新的战略报告，指导宏观，单向形状演变的材料，而不损害材料的完整性。该策略基于创建具有“膨胀极”和“收缩极”的场，以驱动聚合物在目标区域中分解、迁移和重新定居。这一概念证明使用动态水凝胶含有锚定丙烯酸配体和疏水性长烷基链。加入水分子和铁离子（Fe 3+）以诱导溶胀-收缩场将水凝胶从固体转变为中空。该策略是通用的，在生成各种封闭的空心物体（例如，球体，螺旋管，立方体具有不同的直径）为不同的应用。
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.