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. 2012 Jul 3;7(1):370. doi: 10.1186/1556-276X-7-370

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Copyright ©2012 Santos et al.; licensee Springer.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Set of ESEM top view images of NAA samples (scale bar = 1 μm). (a) R-OSC(1) (L_p = 5 μm, and d_p = 30 nm). (b) R-OSC(2) (L_p = 5 μm, and d_p = 41 nm). (c) R-OSC(3) (L_p = 5 μm, and d_p = 52 nm). (d) R-OSC(4) (L_p = 5 μm, and d_p = 71 nm).