G. Choudalakis and A. D. Gotsis, "Free volume and mass transport in polymer nanocomposites", Curr.Op.Col.Interf.Sci., vol. 17, no. 3, pp. 132-140, Jun. 2012. doi:10.1016/j.cocis.2012.01.004
https://doi.org/10.1016/j.cocis.2012.01.004
This review relates the free volume properties and the morphology to the mass transport coefficients of polymer nanocomposites. Direct, utilising the method of Positron Annihilation Life-time Spectroscopy (PALS), or indirect measurements of the free volume in the nanocomposites are discussed and the influence of spherical or anisometric nanoparticles on its properties is examined.