Isoelectric Point of Manganese Oxide

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概要

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• The isoelectric point (IEP) of manganese oxide is measured on samples prepared by heating β-MnO<SUB>2</SUB> and amorphous manganese oxide, MnO<SUB>1.75</SUB>, at temperatures from 200 to 1400°C. The IEP values thus obtained are characteristic of each stage of the oxidation of manganese oxide; that is, <5.1 for MnO<SUB>2</SUB>, 7.6–9.0 for α-Mn<SUB>2</SUB>O<SUB>3</SUB>, and 3.3–5.2 for Mn<SUB>3</SUB>O<SUB>4</SUB>. These values can be explained by the electrostatic interaction theory introduced by Parks, in which the CFSE correction is eliminated. It is also found that manganese ions with specific valencies are responsible for the electrification of the surfaces of manganese oxide.

• 公益社団法人 日本化学会の論文

著者

• Morimoto Tetsuo

  Department Of Biomechanical Systems Ehime University

• Kittaka Shigeharu

  Department Of Chemistry Faculty Of Science Okayama University Of Science

• MORIMOTO Tetsuo

  Department of Bio-mechanical Systems, Faculty of Agriculture, Ehime University

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