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(a) Degree of solute penetration of the linear-microfluidic gel devices with different channel lengths as a function of time. Two horizontal dotted lines represent 72% and 76% of coverage in the active area. (b) Amount of solute draining (loss) from the devices in (a) as a function of time. Note that the longer channels achieving rapid surface coverage leads to earlier loss of the solute carried out by the liquid exiting the device outlet.
