Figure 5.

Analysis of the solid surface fractional area of nanoporous alumina surfaces. (a) High-magnification SEM image of the studied alumina surface. (b) Identification of the solid fraction of the surface (gray scale pixels) and air pockets (red pixels).

Tasaltin et al. Nanoscale Research Letters 2011 6:487   doi:10.1186/1556-276X-6-487
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