Fig. 6.

Left Images showing top and side views of the bubble structures generated from micromachined silicon surfaces for different configurations (1, 2, and 3 crevices) and for increasing power level. Low (electrical) power corresponds to 74 mW, medium power to 182 mW, and high power to 629 mW. Right Corresponding Luminol luminescence in dark room conditions. The scale bar represents 1 mm of a microreactor with total volume of ca. 250 $\mathrm{\mu }\ell$.

Reproduced with permission from [85]. Copyright 2010 Wiley-VCH Verlag GmbH & Co. KGaA