Table 1. Hydrodynamic size, zeta potential, and polydispersity index of SiO2 NPs in RPMI 1640 at different time points.

Time (hour)	Hydrodynamic size (nm)	Zeta potential (mV)	Polydispersity index
0	41.36 ± 2.55	−33.28 ± 0.65	0.18 ± 0.02
24	41.32 ± 3.19	−35.14 ± 0.71	0.19 ± 0.03