Figure 8.

Surface SEM images of the PMMA and PI powders before and after planetary milling. Surface SEM images of the PMMA powder (a) before and (b) after planetary milling, and of the PI powder (c) before and (d) after planetary milling.

Kwon et al. Nanoscale Research Letters 2012 7:261   doi:10.1186/1556-276X-7-261
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