Table 2. Summary of Fitting Model Parameters of MTX Release Data from the PMMA-Fe3O4-PHEMA Janus NP.

		model
		Higuchi		Korsmeyer–Peppas
pH	stage	K	r2	K′	r2	n	drug transport mechanism
5.8	1	4.825	0.9775	4.95	0.9964	0.32	Fickian diffusion
	2	4.673	0.9976	4.858	0.9977	0.49	anomalous diffusion
7.4	1	2.839	0.9835	2.883	0.9873	0.4	Fickian diffusion
	2	2.415	0.9719	3.875	0.9827	0.39	Fickian diffusion