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Research Conducted at University of Paris Has Updated Our Knowledge about Nanotechnology

June 27, 2014

By a News Reporter-Staff News Editor at Science Letter -- Fresh data on Nanotechnology are presented in a new report. According to news reporting from Paris, France, by NewsRx journalists, research stated, "Lepidocrocite is a potentially important Fe-bearing precursor phase for the production of nanoscale Feoxide particles in the environment. We present a detailed magnetic characterization of various alteration products of lepidocrocite resulting from thermal dehydroxylation reactions and bacterially induced bioreduction and remineralization, accompanied by characterization with x-ray diffraction (XRD) and transmission electron microscopy."

The news correspondents obtained a quote from the research from the University of Paris, "Dehydroxylation during annealing at moderate temperatures produces a topotactic transformation from lepidocrocite to maghemite when heated in an oxidizing atmosphere, or to magnetite when heated in a reducing atmosphere. The abiotic Fe-oxide products form an oriented framework of strongly interacting superparamagnetic crystallites and are characterized by a distinctive porous nanostructure observed by electron microscopy. Lepidocrocite bioreduction by the iron-reducing bacterium Shewanella putrefaciens ATCC 8071 produces nanoscale particles of a strongly magnetic phase. This Fe(II)-bearing mineral produced by bioreduction is highly crystalline and euhedral in shape, with a broad grain size distribution and is indicated by magnetic and XRD measurements to be a cation-excess magnetite. We highlight the distinguishing microscopic characteristics of magnetite from both abiotic and bacterially induced mineralization that should allow them to be identified in natural settings."

According to the news reporters, the research concluded: "Moreover, both mechanisms of alteration represent potential pathways for the direct formation of strongly magnetic fine-grained Fe-oxide particles in sedimentary environments."

For more information on this research see: Magnetic comparison of abiogenic and biogenic alteration products of lepidocrocite. Earth and Planetary Science Letters, 2014;395():149-158. Earth and Planetary Science Letters can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier -; Earth and Planetary Science Letters -

Our news journalists report that additional information may be obtained by contacting J.L. Till, Univ Paris Diderot, Sorbonne Paris Cite, Inst Phys Globe Paris, UMR CNRS 7154, F-75005 Paris, France. Additional authors for this research include Y. Guyodo, F. Lagroix, G. Ona-Nguema and J. Brest (see also Nanotechnology).

Keywords for this news article include: Paris, France, Europe, Nanoscale, Nanotechnology, Emerging Technologies

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Source: Science Letter

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