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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.
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Shen et al. (2005) studied this question.
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