Nanosize effect of clay mineral nanoparticles on the drug diffusion processes in polyurethane nanocomposite hydrogelsM. Miotke, J. Strankowska, J. Kwela, M. Strankowski, Ł. Piszczyk, M. Józefowicz and M. GazdaEur. Phys. J. Plus, 132 9 (2017) 401DOI: https://doi.org/10.1140/epjp/i2017-11708-1