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. Author manuscript; available in PMC: 2020 Aug 18.
Published in final edited form as: Carbon N Y. 2018;129:137–151. doi: 10.1016/j.carbon.2017.10.038

Fig. 3.

Fig. 3.

Representative scanning electron microscope (SEM) and optical microscope (OM) images of pristine and environmentally aged for selected times (a) to (c) for PP01, (d) to (f) for PP02, (g) to (i) for PP03.