Table 1. Primary physical and chemical properties of selected NPs.
| NP type | Crystal structure 1 | Shape 1 | Size distribution(nm) 1 | Surface area(m2/g) 2 | Pore volume(mL/g) 2 | Surface chemistry 3 | Chemical composition 1 | Purity (%) 4 |
| TiO2 | Anatase/Rutile | Irregular | 15–60 | 61 | 0.1 | uncoated | Ti, O | >99.5 |
| ZnO | Cubic/tetragonal/orthorhombic | Polyhedral | 10–2000 | 14 | 0.1 | uncoated | Zn, O | >99 |
| SiO2 | Amorphous | Irregular | 5–30 | 226 | 0.7 | uncoated | Si, O | >99 |
| CeO2 | Fluorite | Irregular | 5–20 | 45 | 0.1 | uncoated | Ce, O | >99 |
1
–by TEM, TEM-EDX, SAED.
2
–by BET.
3
–declared by the supplier.
4
–by ICP-OES.