Aqueous cationic, anionic and non-ionic multi-walled carbon nanotubes, functionalised with minimal framework damage, for biomedical application - Chen,S; Hu,S; Smith,EF; Ruenraroengsak,P; Thorley,AJ; Menzel,R; Goode,AE; Ryan,MP; Tetley,TD; Porter,AE; Shaffer,MSP (Biomaterials, 2014)