New paper published in Chemical Engineering Journal on the correlation of ion size / hydrated ion / pore size of sub-1-nm carbon pores. The work was done in collaboration with the team of Guang Feng (HUST, China). The work demonstrates how ion selectivity in mixed ionic systems cannot reliably be predicted by single-salt baseline testing. Also, we demonstrate the importance of durability testing since effects such as ion sieving may very well vary and change over time.