Table 1. Hydrodynamic size and zeta potential of silica particles (40 nm) in dispersion media.

	Distilled water		Culture medium
Time (h)	Diameter (nm)	Zeta potential (mV)	Diameter (nm)	Zeta potential (mV)
1	91.04 ± 0.71	–35.43 ± 0.67	92.54 ± 0.69	–34.03 ± 1.46
3	89.81 ± 0.32	–46.36 ± 0.55	96.50 ± 0.81	–32.47 ± 1.98
6	90.23 ± 1.11	–36.05 ± 0.78	97.28 ± 1.61	–36.57 ± 0.89
12	91.24 ± 2.07	–35.17 ± 1.46	95.36 ± 0.61	–30.80 ± 0.52
24	90.10 ± 0.86	–31.83 ± 2.76	94.38 ± 1.68	–35.23 ± 0.35
48	90.68 ± 0.89	–28.87 ± 1.32	97.56 ± 1.99	–28.87 ± 1.32