Additional file 1.

Characterization and properties of DTH-Fe3O4@SiO2. Figure S1, XRD patterns of Fe3O4 core; Figure S2, TGA curves of Fe3O4@SiO2 (a) and DTH-Fe3O4@SiO2 (b); Figure S3, selectivity of DTH-Fe3O4@SiO2 for Zn2+ in the presence of other metal ions in ethanol; and Table S1, the loading of DTH-APTES in the Fe3O4@SiO2 NPs as estimated by different methods.

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Wang et al. Nanoscale Research Letters 2012 7:86   doi:10.1186/1556-276X-7-86