Table 1.

Characteristics of nanoparticles. Average primary size was determined by the transmission electron microscopy (TEM). Average hydrodynamic diameter and zeta potential was determined in aqueous suspensions at 50 µg·mL⁻¹.

Nanoparticles	Average Diameter of Nanoparticles [nm]	Average Hydrodynamic Diameter [nm]	Zeta Potential [mV]
ZnO nano	72	85	−13
ZnO micro	237	113 1	−17
γ-Fe2O3	12	108	−16
γ-Fe2O3+SiO2	19	118	−42
γ-Fe2O3+SiO2-COOH	28	128	−35
γ-Fe2O3+SiO2-NH2	30	135	+10
Mix γ-Fe2O3/Fe3O4	14	110	−12
Mix γ-Fe2O3/Fe3O4-citrate	12	85	−25
Mix γ-Fe2O3/Fe3O4-malate	11	90	−22
C60	26	185	−36
Cu	105	NA 2	−17
CuO	130	NA 2	−24
SiO2	30	40	−31.5
SiO2-NH2	30	42	−20
SiO2-COOH	30	42	0

¹ Before the measurement, we observed intensive sedimentation of the particles. Measurement did not include sedimented particles. ² Measurement was not possible, due to the instability of particle suspension.