Figure 4.

SEM images of PS-based composite SPEs. PS-based composite SPEs with (a) 5 wt.%, (b) 10 wt.%, (c) 15 wt.%, and (d) 20 wt.% Al2O3 contents at a magnification of ×300.

Lim et al. Nanoscale Research Letters 2012 7:19   doi:10.1186/1556-276X-7-19
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