Experimental

Tip Surface Charge Density

(C/m² )

Silica Surface Charge Density

(C/m² )

1

−0.017078161

−0.002777057

2

−0.017313576

−0.001587851

3

−0.01575993

−0.003525419

Avg. (±SD)

−0.01672 (±0.00084)

−0.00263 (±0.00098)