Rapid prototyping of microchannels with bell-shaped (as opposed to rectangular) cross-sections (see Figure) is reported. These microchannels are ideal for deformation-based microfluidic valving using piezoelectric vertical actuator arrays in refreshable Braille displays. The fabrication method is based on diffused backlight exposure with a transilluminator and is cost and time efficient.
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Futai et al. (2004) studied this question.
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