Our database on nanomaterial biodistribution after inhalation and two articles describing the data can be found here (links lead to the journal Nanotoxicology)
In the second paper we found the data on lung content to support Haber’s rule. Morever, titanium was deposited to a greater extent than the other materials. Lung deposition seemed relatively linear for the MMAD values, indicating size may be less important than previously suggested concerning alveolar deposition of the sub-2-micrometre size.