School of Mechanical and Aerospace Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798, Singapore.
ACS Appl Mater Interfaces. 2017 Aug 9;9(31):26429-26437. doi: 10.1021/acsami.7b07445. Epub 2017 Jul 25.
On the basis of the thermoreversible sol-gel transition behavior of κ-carrageenan in water, a double-network (DN) hydrogel has been fabricated by combining an ionically cross-linked κ-carrageenan network with a covalently cross-linked polyacrylamide (PAAm) network. The κ-carrageenan/PAAm DN hydrogel demonstrated an excellent recoverability and significant self-healing capability (even when notched). More importantly, the warm pregel solution of κ-carrageenan/AAm can be used as an ink of a three-dimensional (3D) printer to print complex 3D structures with remarkable mechanical strength after UV exposure. Furthermore, the κ-carrageenan/PAAm DN hydrogel exhibited a great strain sensitivity with a gauge factor of 0.63 at the strain of 1000%, and thus, the hydrogel can be used as sensitive strain sensors for applications in robotics and human motion detection.
基于κ-卡拉胶在水中的温敏溶胶-凝胶转变行为，通过将离子交联的κ-卡拉胶网络与共价交联的聚丙烯酰胺（PAAm）网络相结合，制备了一种双网络（DN）水凝胶。κ-卡拉胶/PAAm DN 水凝胶表现出优异的可恢复性和显著的自修复能力（即使有切口）。更重要的是，κ-卡拉胶/AAm 的温预凝胶溶液可用作三维（3D）打印机的墨水，在暴露于 UV 光后可打印出具有显著机械强度的复杂 3D 结构。此外，κ-卡拉胶/PAAm DN 水凝胶在应变 1000%时表现出很大的应变敏感性，其灵敏系数为 0.63，因此，该水凝胶可用作灵敏应变传感器，应用于机器人和人体运动检测。
