High proton conductivity state of water in nanoporous materials I. A. Ryzhkin, M. I. Ryzhkin, A. M. Kashin, E. A. Galitskaya and V. V. Sinitsyn EPL, 126 3 (2019) 36003 Published online: 18 June 2019 DOI: 10.1209/0295-5075/126/36003