Figure 3.

The influence of nanoparticle surface area (mass concentration) on TiO2 (P25) dispersion characteristics: a pH; b zeta potential and hydrodynamic diameter. Solvent is DI water.

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