Control of Nanometer-Scale Tunnel Sizes of Porous Manganese Oxide Octahedral Molecular Sieve Nanomaterials


  • We thank the Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy for financial support. We also thank Dr. Jonathan Hanson and Dr. Xianqin Wang for help with Synchrotron X-ray diffraction experiments. Dr. Francis S. Galasso, Dr. Mihai Polverejan, and Sinue Gomez are also thanked for helpful discussions. Supporting Information is available online from WileyInterScience, or from the author.


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Manganese oxide octahedral molecular sieves with increasing nanoscale tunnel sizes are systematically synthesized using hydrothermal treatment of Na-birnessite under increasing pH conditions. OMS-5 (2×4), OMS-6 (2×3), and OMS-7 (1×1; see Figure) tunnel structures have been synthesized at pH values of 13, 7.0, and 1.0, respectively.