Bacterially produced manganese oxide and todorokite

UV Raman spectroscopic comparison

Hack Sung Kim, Peter C Stair

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

UV Raman spectroscopic data measured at two distinct conditions, low and high laser power, establish that the manganese oxide (SP6-MnO x) produced by the freshwater bacterium (Leptothrix discophora SP-6) closely resembles the 3 × 3-tunnel todorokite among the MnO 2 materials studied. Under the two conditions, the effect of hydration/cation and the phase transition of todorokite or SP6-MnO x to Mn 3O 4 or birnessite will be described. A higher concentration of Mg 2+ incorporated in the framework of the SP6-MnO x than in todorokite is probably responsible for the formation of a new Raman band obtained at high laser powers, matching the most intense UV Raman band of synthetic birnessite. Also, we present the assignment of Raman bands for todorokite mineral and discuss the mutual exclusion principle that should hold for all the MnO 2 materials studied. These experiments provide characterization of hydrous, poorly crystalline, or nanocrystalline metal oxides, which are frequently difficult to identify.

Original languageEnglish
Pages (from-to)17019-17026
Number of pages8
JournalJournal of Physical Chemistry B
Volume108
Issue number44
DOIs
Publication statusPublished - Nov 4 2004

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Manganese oxide
manganese oxides
High power lasers
high power lasers
Hydration
Oxides
Minerals
Cations
Bacteria
Tunnels
Phase transitions
Positive ions
Metals
Crystalline materials
exclusion
bacteria
metal oxides
hydration
tunnels
minerals

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Bacterially produced manganese oxide and todorokite : UV Raman spectroscopic comparison. / Kim, Hack Sung; Stair, Peter C.

In: Journal of Physical Chemistry B, Vol. 108, No. 44, 04.11.2004, p. 17019-17026.

Research output: Contribution to journalArticle

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