Ti3C2Tx MXene-Activated Fast Gelation of Stretchable and Self-Healing Hydrogels: A Molecular Approach
Ti3C2Tx MXene-Activated Fast Gelation of Stretchable and Self-Healing Hydrogels: A Molecular Approach
复制标题
Ti3C2TX MXene 激活的可拉伸和自修复水凝胶的快速凝胶化：分子方法
DOI：
10.1021/acsnano.0c07998
复制
发表时间：
2021-01-20
期刊：
影响因子：
17.1
通讯作者：
Alshareef, Husam N.
中科院分区：
文献类型：
--
作者：
Ge, Gang;Zhang, Yi-Zhou;Alshareef, Husam N.
基于MXene的水凝胶是一种蓬勃发展的软材料家族，最近已成为可拉伸电子产品的有前途的候选者。尽管最近的进展，大多数作品使用MXene作为导电纳米填料。在本文中，通过调整MXene纳米片和水凝胶内其他成分之间的分子相互作用，我们证明了Ti 3C 3 Tx MXene可以作为一种通用的交联剂，从各种单体和聚合物基前体开始，激活各种水凝胶的快速凝胶化。凝胶化行为在水凝胶之间显著变化。一般而言，快速凝胶化机制归因于在Ti 3C 2 Tx MXene的帮助下更容易产生自由基以及MXene与聚合物之间存在多尺度分子相互作用。使用MXene作为动态交联剂可获得上级的机械性能、粘附力和自修复能力。由于Ti 3C 3 Tx的固有光热行为和聚合物的非均相相变特征，聚合物-MXene水凝胶被证明在近红外照射下表现出独特的基于热敏的致动，伴随着快速的形状转变。
MXene-based hydrogels, a flourishing family of soft materials, have recently emerged as promising candidates for stretchable electronics. Despite recent progress, most works use MXenes as conductive nanofillers. Herein, by tuning the molecular interactions between MXene nanosheets and other constituents within the hydrogels, we demonstrate Ti3C3Tx MXene can act as a versatile cross-linker to activate the fast gelation of a wide range of hydrogels, starting from various monomer- and polymer-based precursors. The gelation behavior varies significantly across hydrogels. In general, the fast gelation mechanism is attributed to the easier generation of free radicals with the help of Ti3C2Tx MXene and the presence of multiscale molecular interactions between MXene and polymers. The use of MXene as a dynamic cross-linker leads to superior mechanical properties, adhesion, and self-healing ability. Owing to the inherent photothermal behavior of Ti3C3Tx and the heterogeneous phase-transforming features of polymers, a polymer-MXene hydrogel is demonstrated to exhibit distinctive thermosensation-based actuation upon near-infrared illumination, accompanied by rapid shape transformation.