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. Author manuscript; available in PMC: 2014 Jul 19.
Published in final edited form as: Adv Funct Mater. 2013 Feb 13;23(27):3404–3412. doi: 10.1002/adfm.201202926

Figure 2.

Figure 2

Morphology of porous silk microchannels. (A) Channel profiles can be half-moon or rectangular (scale bars = 50 μm). (B) The optimal microchannel height is 25 μm. Microchannels with heights greater than 25 μm tear during removal from the PDMS mold as demonstrated by 125 μm high channels (scale bars = 50 um). (C) After the microchannels are removed from the PDMS mold there is a 1–10% increase in channel width and 20–34% decrease in channel depth. (D) Channel widths range from 25 μm to 300 μm and versatile branching patterns can be achieved (scale bar = 100 μm). (E) The microchannels contain pores that are open to the bulk space and are 2.2 um (1.3 +/− standard deviation) in diameter (scale bar = 20 μm).