X-ray diffraction experiments were performed on MnO confined in mesoporoussilica SBA-15 and MCM-41 matrices with different channel diameters. Themeasured patterns were analyzed by profile analysis and compared to numericalsimulations of the diffraction from confined nanoparticles. From the lineshapeand the specific shift of the diffraction reflections it was shown that theembedded objects form ribbon-like structures in the SBA-15 matrices withchannels diameters of 47-87 {\AA}, and nanowire-like structures in the MCM-41matrices with channels diameters of 24-35 {\AA}. In the latter case theconfined nanoparticles appear to be narrower than the channel diameters. Thephysical reasons for the two different shapes of the confined nanoparticles arediscussed.
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