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Magnetic properties of FGO. (A) SQUID magnetization curve. (B) Spin-spin (T2) relaxation measurements acquired on a 4.7T MRI of FGO (I a= 625, c= 500; II a=313, c= 250; III a=156, c=125μg mL−1) and GO (I b= 625, d= 500; II b=313, d= 250; III b=156, d=125μg mL−1). The positive control (*) consists of diluted magnevist (0.5mg mL−1). (C) Rotational magnetic field snapshots of FGO under a field of 12mT, rotation is clockwise.
