Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction and Institute for Advanced Study, The Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, China.
HKUST Shenzhen Research Institute, No. 9 Yuexing 1st RD, South Area, Hi-tech Park Nanshan, Shenzhen, 518055, China.
Adv Mater. 2019 Oct;31(40):e1902365. doi: 10.1002/adma.201902365. Epub 2019 Aug 7.
The dynamic behavior of a macroscopic adhered hydrogel stabilized through controllable dynamic covalent interactions is reported. These interactions, involving the cross-linked formation of a hydrogel through reaction of a diacylhydrazine precursor with a tetraformyl partner, increase as a function of time. By using a contact time of 24 h and different compounds with recognized aggregation-induced emission features (AIEgens), it proves possible to create six laminated acylhydrazone hydrogels displaying different fluorescent colors. Blocks of these hydrogels are then adhered into a structure resembling a Rubik's Cube, a trademark of Rubik's Brand Limited, (RC) and allowed to anneal for 1 h. This produces a 3 × 3 × 3 block (RC) wherein the individual fluorescent gel blocks are loosely adhered to one another. As a consequence, the 1 × 3 × 3 layers making up the RC can be rotated either horizontally or vertically to produce new patterns. Ex situ modification of the RC or application of a chemical stimulus can be used to produce new color arrangements. The present RC structure highlights how the temporal features, strong versus weak adhesion, may be exploited to create smart macroscopic structures.
报道了一种通过可控动态共价相互作用稳定的宏观附着水凝胶的动态行为。这些相互作用涉及通过二酰肼前体与四甲酰基配体的反应交联形成水凝胶，其随时间增加。通过使用 24 小时的接触时间和具有公认聚集诱导发射特性（AIEgens）的不同化合物，可以制造出显示不同荧光颜色的六个层状酰腙水凝胶。然后将这些水凝胶的块体附着成类似于魔方的结构，魔方是魔方品牌有限公司的商标（RC），并允许其退火 1 小时。这产生了一个 3×3×3 块（RC），其中各个荧光凝胶块体松散地附着在一起。因此，构成 RC 的 1×3×3 层可以水平或垂直旋转以产生新的图案。可以对外置的 RC 进行修饰或施加化学刺激，以产生新的颜色排列。目前的 RC 结构强调了时间特征，即强与弱的附着力，如何被利用来创造智能宏观结构。
