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(a,b) TEM images of the two MOP-NP types used here show mesoporous structure and shape; (c) Simplified depiction of the crystalline structure with hollow pores taking up most of the volume; yellow rods with red ends: organic linker, blue dots: metal centers; (d,e) Size histogram of MOF-NPs based on particle analysis of electron micrographs yields a typical size for MIL-100(Fe) of 53 nm and for MIL-101(Cr) of 19 nm.
