Figure 5.

The effect of the pillar diameter upon the T₉₀ response time of the microfluidic sensor, as calculated using the response data given in Figure 4. Comparison is made between the results obtained using pillars of diameter 100 μm and 300 μm, with surface area-to-volume ratios of 40 mm⁻¹ and 13.3 mm⁻¹, respectively. As expected, the response time is substantially smaller for the sensor that utilizes smaller diameter pillars.