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) |