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Table 3 Specifications of CaCO3, TiO2, and Al2O3 NPs

From: Optimizing nanoparticle attributes for enhanced anti-wear performance in nano-lubricants

Property

CaCO3

TiO2

Al2O3

Morphology

Rhombohedral

Rhombohedral

Rhombohedral

% Purity

100%

100%

100%

Average particle size (nm)

32.7

35.1

33.6

Molar mass (g/mole)

100.09

79.87

101.96

Specific surface area (m2/g)

52

48

53

Bulk density (g/cm3)

2.71

4.23

3.95

Bulk hardness, Mohs

3

6

9