Chemical composition and not only total surface area is important for the effects of ultrafine particles.
Ovrevik
Johan
J
Schwarze
Per E
PE
D000818:Animals; D002244:Carbon / Q000737:chemistry* / Q000633:toxicity*; D007249:Inflammation / Q000139:chemically induced / Q000378:metabolism; D007442:Intubation, Intratracheal; D008168:Lung / Q000187:drug effects* / Q000473:pathology*; D010316:Particle Size; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry* / Q000633:toxicity*
C009495:titanium dioxide; D002244:Carbon; D014025:Titanium