Zhang Yipeng, Xu Junhuai, Wang Haibo
West China Hospital of Sichuan University Chengdu 610041 China.
College of Biomass Science and Engineering, Sichuan University Chengdu 610065 P. R. China
RSC Adv. 2021 Nov 23;11(59):37661-37666. doi: 10.1039/d1ra06686b. eCollection 2021 Nov 17.
Bio-based ionogels with versatile properties are highly desired for practical applications. Herein, we designed a novel self-healing, anti-freezing, and self-adhesive ionogel with excellent sensor capability. The ionogel was obtained by cross-linking amino groups (chitosan) and aldehyde groups (dextran oxide) to form Schiff-base bonds in the ionic liquids (EMIMOAc) with TA. Ionogels inherited the superior electrical conductivity of ionic liquids (IG, 1.1 mS cm). Due to the dynamic reaction of Schiff-base bonds, the obtained IG possessed self-healing properties (self-healing efficiency = 89%). The presence of TA also provided the ionogel with excellent self-adhesive properties (IG/TA, adhesive strength to hogskin = 8.05 kPa). Owing to the low freezing point and low vapor pressure of ionic liquids, ionogels were endowed with anti-freeze properties and resistance to solvent volatility. Moreover, the ionogel can act as a strain sensor, and exhibited excellent sensitivity and sensing performance. Our work provided a green and effective method in preparation of the high performance ionogel sensor, which could accommodate future practical industrial applications.
具有多种特性的生物基离子凝胶在实际应用中具有很高的需求。在此，我们设计了一种具有优异传感能力的新型自愈合、抗冻和自粘性离子凝胶。该离子凝胶是通过在离子液体（EMIMOAc）中，使氨基（壳聚糖）和醛基（氧化葡聚糖）交联形成席夫碱键，并与TA反应得到的。离子凝胶继承了离子液体的优异导电性（IG，1.1 mS cm）。由于席夫碱键的动态反应，所制备的IG具有自愈合性能（自愈合效率 = 89%）。TA的存在还赋予离子凝胶优异的自粘性（IG/TA，对猪皮的粘附强度 = 8.05 kPa）。由于离子液体的低冰点和低蒸气压，离子凝胶具有抗冻性能和耐溶剂挥发性。此外，该离子凝胶可作为应变传感器，并表现出优异的灵敏度和传感性能。我们的工作为制备高性能离子凝胶传感器提供了一种绿色有效的方法，有望满足未来实际工业应用的需求。
