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. 2015 Jul 17;5:12135. doi: 10.1038/srep12135

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(a) TEM images of magnetite MGNCs with various diameters (scale bars in all images are 200 nm), (b) high-resolution TEM images of sample S6 (top image shows an isolated MGNC, whereas the bottom image shows a corresponding granule marked in a white box), (c) XRD patterns, and (d) average granule diameters calculated from the full-width-at-half-maximum (FWHM) of the strongest (311) XRD peaks.