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Fig. 1 | Particle and Fibre Toxicology

Fig. 1

From: Genetic toxicity assessment of engineered nanoparticles using a 3D in vitro skin model (EpiDermâ„¢)

Fig. 1

BASF Levasil® silicon dioxide nanoparticle primary characterisation: Bright field TEM micrographs of (a) 16 nm-SiO2, and (b) 85 nm-SiO2, allowed primary particle size, shape and morphology to be assessed. c Typical particle EDX spectrum relative to background confirming the presence of silicon and oxygen with no detectable contaminants (copper and carbon due to TEM grid and support film). d Schematic illustrating the negative surface charge of SiO2 particles, due to unbound surface oxygen groups

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