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Bonding coverage image of PMMA microchannels with different annealing methods and concentrations for: (a) acetone, and (b) ethanol. (c) summarizes the bonding coverages with different acetone and ethanol concentrations. The error bars in the figure are obtained from more than 3 individual experiments. The microscope images shown in (a) and (b) were taken by an inverted microscope (Nikon Eclipse Ti, Nikon Corp. Tokyo, Japan). Microwave radiation time was 130 s.
