Figure 1.

SEM images of the ZnO hierarchical architectures used for the cytotoxic assessment on RSC96 Schwann cells. (a) ZnO NPs, (b) hollow ZnO microspheres, (c) prism-like ZnO, and (d) flower-like ZnO.

Yin et al. Nanoscale Research Letters 2012 7:439   doi:10.1186/1556-276X-7-439
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