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(A), (B) TEM images of OMSNs at different magnifications. (C) SEM image of OMSNs. (D)–(E) TEM images of HOMSNs at different magnifications. (F) SEM image of HOMSNs. The inset in (D) shows porous nanochannels in the shell, and the inset in (F) shows the hollow interior of a HOMSN.
