Figure 2
From: Application of short-term inhalation studies to assess the inhalation toxicity of nanomaterials
Scanning electron microscopy images of the suspension test materials. A: SiO2.naked, B: SiO2.PEG, C: SiO2.amino, D: SiO2.phosphate, E: ZrO2.TODA, F: ZrO2.acrylate. Note slightly different sets of scales in order to point to the individual characteristics of the respective test materials.