Table I.

Key physico-chemical characteristics of Printex 90.

Declared particle size	14 nm	Degussa-Hüls
Geometric mean size	65 nm (carbon spheres)	(Saber et al. 2005)
Morphology	Individual carbon black spheres mainly occurred in open-structured long chain aggregates and fewer large dense aggregates	(Saber et al. 2011)
Particle size distribution	The aggregates cover a wide size-range from <100 nm to 20–30 mm; the typical aggregate size is approximately 200 nm	(Saber et al. 2011)
Surface area	295–338 m2/g	(Saber et al. 2005) (Jacobsen et al. 2008b)
Pycnometric particle density	2.1 g/cm3	(Saber et al. 2005)
Chemical composition	99% C, 0.8% N and 0.01% H2	(Jacobsen et al. 2008b)
The total PAH content (Carbon black extract – Soxhlet)	0.0742 mg/g	(Jacobsen et al. 2007)
The total PAH content (DEP extract – NIST SRM 1650)	216 mg/g	(Jacobsen et al. 2008a)

PAH, polycyclic aromatic hydrocarbon (data included for comparison); DEP, diesel extract particles.