Figure 6.

SEM images of PMMA membranes obtained by a selective chemical etching of PMMA/silica. Samples with mixing ratio of (a) 1:2, (b) 1:1, and (c) 2:1 (PMMA/silica sol) seen in Figure 2 were used.

Lee et al. Nanoscale Research Letters 2012 7:440   doi:10.1186/1556-276X-7-440
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