Table 1.

Physicochemical properties of KCREKA-NPs and PEG-NPs.

Sample	Core	Gd/ Fe3O4	Size/nm (Number Average)	Size/nm (Z-Average)	P.I	r1/ mM Fe s−1	r2/ mM Fe s−1
KCREKA-NP	Fe3O4	0.75	23 ± 4	97 ± 2	0.11	1.68 ± 0.29	149 ± 2
PEG-NP	Fe3O4	0.11	25 ± 8	94 ± 4	0.24	0.69 ± 0.3	151 ± 5