Table 2. Physico-chemical properties of the studied nanomaterials (NMs were ≥99% pure).

NMs	Provider	Coating	Shape	Specific surface area [m2/g]	Primary size (TEM) [nm]	Hydrodynamic size in DI (DLS) [nm]	pdi in DI	ζ -potential in DI [mV]
SiO2*	Nanologica	No	Spherical	910 ± 42	212 ± 52	854 ± 38	0.6	−37.9
Ag	Colorobia	PVP-stabilized	Spherical	n.d.	20.4 ± 6.8	132 ± 0.5	0.2	−10.6
Au**	Inmetro	Citrate	Spherical	n.d.	13.3 ± 0.8	23 ± 4	0.2	−48
MWCNT	Nanocyl	No	Tubular	265 ± 18	diameter: 10.2 ± 0.5length: >1000***	n.a.	n.a.	n.a.
CuO	Intrinsiq Materials	No	Spherical	23 ± 3.7	24.5 ± 2.3	152 ± 2	0.2	45.4
ZnO	Nanogate	No	Spherical	58 ± 5	13.6 ± 1.7	102 ± 1	0.2	32.1
TiO2****	CCMB	No	Spherical	257 ± 47	<5	367 ± 60	0.4	14.2

*Mesoporous; **Acidic suspension (pH = 5.8); ***Measured by SEM; ****Anatase crystal structure with some rutile present according to XRD analysis. DI, deionized water; DLS, hydrodynamic light scattering; n.a., not applicable; PVP, polyvinyl-pyrrolidone; pdi, polydispersity index; SEM, scanning electron microscopy; TEM, transmission electron microscopy.