Figure 6From: Preparation of silica nanospheres and porous polymer membranes with controlled morphologies via nanophase separationSEM 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.Back to article page