Figure 2 .

SEM images of the membrane back-side. (a) Top-view and (b) highly magnified top-view. Optical microscopy images of the membrane in cross-section (c) in the center of the membrane, and (d) near the O-ring.

Gerngross et al. Nanoscale Research Letters 2012 7:379   doi:10.1186/1556-276X-7-379
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