“…Urea removes water molecules from Stern and palisade layers and thus decreases the CP. Abuin et al [47] also observed that probe molecules are displaced by urea molecules at the interfacial region, causing a decrease in the slope of I/I o in the post-micellar region. Alkylureas, being bigger in size, replace more water and, therefore, CP decrease is sharper with the alkylureas (see Fig.…”