No of Experiments

Tip Surface Charge Density

(C/m2 )

Silica Surface Charge Density

(C/m2 )

1

−0.013056099

−0.002430071

2

−0.012296685

−0.002906252

3

−0.014398812

−0.0011996

Avg. (±SD)

−0.01325 (±0.00106)

−0.00218 (±0.00088)