. Author manuscript; available in PMC: 2019 Jul 24.

Published in final edited form as: Nano Res. 2019 May 29;12(6):1473–1481. doi: 10.1007/s12274-019-2418-4

Table 1.

Summary of materials characterization and surface functionalization analysis of various functionalized Fe₃O₄ NPs synthesized at a large-scale.

Nanoparticle Sample	TEM Diameter (nm)	DLS Diameter (nm)^a	PDI^b	ζ-Potential pH 7.4 (mV)^c	TGA Weight Loss (%)	Surface Density (ligands/nm²)

Fe₃O₄-OA	8.0 ± 0.5	9.1 ± 0.5	0.106 ± 0.003	-	44	14
Fe₃O₄-APTMS/Si-PEG	8.0 ± 1.4	50 ± 2	0.15 ± 0.01	10.4 ± 0.3	34	7
Fe₃O₄-GAPT	8.2 ± 1.2	97 ± 8	0.24 ± 0.03	32.7 ± 0.7	47	8

DLS measurements were performed in n-hexane for the Fe₃O₄-OA, and in aqueous media for the Fe₃O₄-APTMS/Si-PEG and Fe₃O₄-GAPT NPs.

Polydispersity index (PDI) obtained from DLS measurement.

Zeta-potential (ζ-potential) obtained in PBS buffer (pH 7.4). All errors indicate standard deviations from measurements on three independent batches of particles.