In Applied Science Dr. Seeni Meera Kamal Mohamed and coworkers describe the preparation of biocompatible and transparent silica aerogels as ionogels using choline dihydrogen phosphate.
Reference: S. M. Kamal Mohamed, R. Murali Sankar, M. S. Kiran, S. N. Jaisankar, B. Milow, A. B. Mandal, Applied Science 2021, 11, 206. https://doi.org/10.3390/app11010206