Fig. 2From: Impact of semi-solid formulations on skin penetration of iron oxide nanoparticlesVariation of the r 2 (a) and Dh values (b) of PMA-IONs loaded in hydrogels made of HEC (grey, solid line), CMC (grey, dash line) and CP (black, solid line) over time. The water suspension of PMA-IONs (black, dash line) was used as controlBack to article page