Figure 4.

TEM images of the hollow magnetite microspheres obtained at different reaction times. TEM images of the hollow magnetite microspheres obtained at different reaction times: 8 h (a), 16 h (b) and 24 h (c, d). Figure 4e corresponds to the SAED pattern of the boxed region shown in image d.

Márquez et al. Nanoscale Research Letters 2012 7:210   doi:10.1186/1556-276X-7-210
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