Preparation of covalently cross-linked gels (CC gels)
Ionic liquid–based click-ionogels
Sci Adv, Aug 23, 2019; DOI: 10.1126/sciadv.aax0648

For the synthesis of covalent cross-linked gels, PEGDA (0.6 g, 1 mmol), PETA (43.8 mg, 0.1 mmol), and TEA (11.0 mg, 0.11 mmol) were dissolved in 0.65 ml of methanol. Then, ED (112.8 mg, 1.2 mmol) was added to the mixture under vigorous stirring, and the gelation time was checked by tube inversion method (fig. S6). In this system, the gelation time can be controlled from 40 s to 240 min, depending on the amount of catalyst added (table S1). Subsequently, the obtained gel was soaked in IL-BF4 and then dried at 80°C under vacuum for 24 hours to displace methanol with IL-BF4 to obtain CC gels. A similar procedure was used for preparing PC organogels and EG organogels.