In March 19, 2016, Dr. Liu attended the GCCCD Polymer Symposium held in Max-Plank Institute in Mainz. Dr. Liu made a presentation titled as "Number distribution of ligand chains on the surface of polymer-grafted nanoparticles" in this symposium. 

http://www.gcccd.de/files/news/Bericht_GCCCD_Mainz_Polymer%20Forum_19032016.pdf