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A transmission electron microscope was used to characterize a powder form of hexagonallyordered mesoporous silica material. The structural symmetry built into this amorphous material allowed one to obtain three characteristic images, i.e. a hexagonal honey-comb structure and wide/narrow parallel lines. These images were found to originate primarily from phase contrast, which changed sensitively with defocusing. To further understand the contrast behaviour of these images, an analytical form ofdoi:10.1039/c0cp01141j pmid:21076765 fatcat:xnbn3gr3ifa5dmv6loiwva6p4m