Left: simulated (green dashed) and experimental viscosity (black spheres) of 1.5 M DEHiBA applying a variation of the spontaneous packing parameter from 2.6 to 2.0, κ* = 3 kT/extractant and an effective extractant concentration of 1.2 M. Right: simulated viscosity (green dotted) applying additionally a solvent penetration of 3%. For both cases, additionally the microphase distribution of end-caps (orange), cylinders (grey) and junctions (blue) is shown.