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. 2017 Feb 23;8:14559. doi: 10.1038/ncomms14559

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N₂ adsorption–desorption isotherms of (a) protonated MnO₂, (b) reassembled MnO₂ treated in pH=2 solution for 24 h, (c) reassembled MnO₂ treated in pH=4 solution for 24 h. Curves (b) and (c) are offset by 50 and 200 cm³ g⁻¹ STP, respectively.