We were pleased to welcome Professor Pavel Levkin and his PhD student Sida Liu from the Karlsruhe Institute of Technology to our CRC this week. Following Professor Levkin's inspiring lecture, Sida Liu presented his research on "3D Printed polyelectrolyte hydrogel for Osmotic Engine". Their visit provided an opportunity for us to present our research progress, show them around our laboratories, and have productive discussions about current and future research collaboration.