Nanophase iron oxides

H.V.Jr. Adams, J.B. (1993) Pigmenting agents in Martian soils Inferences from spectral, Mossbauer, and magnetic properties of nanophase and other iron oxides in Hawaiian palagonitic soil PN-9. Geochim. Cosmo-chim. Acta 57 4597-4609 Morris, R.V Golden, D.C. ShelfepTD. ... 

Raman chemical imaging can be employed to access the homogeneity and the structural stability in terms of oxidation rates, onset of hematite, and organic contamination of as-precipitate and oxidized iron oxide samples. Oxidation-related Raman features have been established by comparative study of bulk oxides and nanoparticles attained in two different oxidation states, suggesting that the solid nanophase synthesized had a mixed magnetite-maghemite composition [52]. 

Figure 2.32. TEM micrographs of NanoTec iron oxide. Courtesy of Nanophase Technologies Corporation, Burr Ridge, IL, USA.

Pierre, T.G.S., Sipos, P., Chan, P., Chua-Anusorn, W., Bauchspiess, K.R., Webb, J. Synthesis of nanoscale iron oxide structures using protein cages and polysaccharide networks. Nanophase Mater. Synth. Prop. Appl. 260, 49-55 (1994)... 

Nanoparticles of iron and aluminum oxides and oxyhydroxides transport both organic and inorganic contaminants in the environment. The systematics developed here may be applied to understanding such natural nanocomposites. For example, it may be possible to treat coating of amorphous uranium or chromium oxides on nanophase (Fe, Al)OOH particles as a mixture of nanophase end-members from the point of view of energetics. 

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