Table 1.

Particle size distribution and zeta potential of the ENP suspensions. Beside the mean values, the standard deviations (NTA, TEM) or the peak width (DLS, Zeta) are given respectively. Analyses of DLS, NTA, and zeta potentials were conducted in (at least) five replicates. If possible, the particle sizes were additionally estimated on the basis of TEM images (n ≥ 57); due to aggregation, the size of TiO₂ and CeO₂ of individual particles were not measurable

	Ag	TiO2	CeO2	ZnO	Au 10 nm	Au 200 nm
DLS	52 ± 20	108 ± 2	24 ± 9	429 ± 105	29 ± 12	181 ± 87
NTA	55 ± 19	197 ± 72	86 ± 4	285 ± 106	(too small)	247 ± 10
TEM	18 ± 4	(<20 nm)	(<20 nm)	(13 ± 5)	9 ± 2	279 ± 18
Zeta potential [mV]	−18 ± 7	−30 ± 7	40 ± 10	−32 ± 4	−42 ± 1	−46 ± 9