Table 1.

Shielding factors observed without (collectors off, 0c) and with (collectors on) redox cycling in the open and closed microchannel. For the calculation of S_f, the current at a single generator electrode (collectors off) was set to i₁, and the current at x-shorted-generator electrodes with collectors on was set to i_x.

		Scan Rate/V/s
	# gen./# coll.	0.001	0.010	0.050	0.100	0.500	1.000
Open	2g/0c	0.12	0.03	−0.01	0.00	−0.01	−0.01
	3g/0c	0.20	0.01	−0.03	−0.04	−0.05	−0.04
	7g/0c	0.37	0.27	0.20	0.19	0.18	0.18
	2g/3c	−0.10	−0.11	−0.02	0.00	0.00	0.00
	3g/4c	−0.15	−0.15	−0.06	−0.05	−0.04	−0.04
	7g/7c	0.13	0.14	0.19	0.19	0.18	0.18
Closed	2g/0c	0.28	0.58	0.53	0.23	0.54	0.56
	3g/0c	0.33	0.29	0.18	0.17	0.16	0.18
	7g/0c	0.15	0.28	0.11	0.15	0.11	0.11
	2g/3c	−0.99	0.38	0.47	0.48	0.57	0.59
	3g/4c	−4.06	−0.19	0.17	0.18	0.17	0.19
	7g/7c	−3.13	−0.20	0.17	0.16	0.08	0.12

Negative values at intermediate and high scan rates, where diffusion layers have minimal overlap, indicate that the signal of the single electrode is less than the average signal of x electrodes, but are within error of the electrode-to-electrode signal reproducibility. Negative values at low scan rates (0.001 and 0.010 V/s) result from large i_x values that reflect the amplified signal due to redox cycling.