Journal article
Fractionation of graphene oxide single nano-sheets in water-glycerol solutions using gradient centrifugation
E Bidram, A Sulistio, A Amini, Q Fu, GG Qiao, A Stewart, DE Dunstan
Carbon | Published : 2016
Abstract
A centrifugation method for the separation and fractionation of graphene oxide (GO) single nano-sheets in the size range of 150-850 nm is reported. The measured electrophoretic mobility of the fractionated single sheets ranges from -0.2 to -1.4 μm cm/V·s where the interpreted zeta potentials vary from -3 mV to -17 mV with increasing sheet size. The single GO sheets show auto-fluorescence in the visible range of 350-650 nm using an excitation wavelength of 200 nm. Furthermore, the GO nano-sheets functionalized using PEG are found to be non-cytotoxic in in-vitro at concentrations up to 90 μg/ml, with a small reduction in cell viability -10%- at 260 μg/ml. The observed concentration-dependence ..
View full abstractGrants
Funding Acknowledgements
Financial support from the University of Melbourne is greatly acknowledged. We also would like to thank Professor Xiaoming Sun and his PhD student Guoxin Zhang from State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, China for their kind guidance on the GO separation part.