Figure 4.

TEM images of some matrices. (a) Preparation of the ultra-thin films samples by cross-section for TEM analysis. TEM images obtained of (b) PUFs, (c) PA and (d) PAN fibers at different temperatures.

Domènech et al. Nanoscale Research Letters 2013 8:238   doi:10.1186/1556-276X-8-238
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