Figure 6.

Different sized anatase TiO2 nanoparticles dispersed in DI water with the same mass concentration of 50 μg/ml: a pH and surface area concentration; b dispersion zeta potential and hydrodynamic diameter.

Suttiponparnit et al. Nanoscale Res Lett 2011 6:27   doi:10.1007/s11671-010-9772-1