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New Anions Study Findings Have Been Reported by Researchers at University of Wisconsin [Oxygen Spectroscopy and Polarization-Dependent Imaging...

August 26, 2014



New Anions Study Findings Have Been Reported by Researchers at University of Wisconsin [Oxygen Spectroscopy and Polarization-Dependent Imaging Contrast (PIC)-Mapping of Calcium Carbonate Minerals and Biominerals]

By a News Reporter-Staff News Editor at Life Science Weekly -- A new study on Anions is now available. According to news reporting out of Madison, Wisconsin, by NewsRx editors, research stated, "X-ray absorption near-edge structure (XANES) spectroscopy and spectromicroscopy have been extensively used to characterize biominerals. Using either Ca or C spectra, unique information has been obtained regarding amorphous biominerals and nanocrystal orientations."

Our news journalists obtained a quote from the research from the University of Wisconsin, "Building on these results, we demonstrate that recording XANES spectra of calcium carbonate at the oxygen K-edge enables polarization-dependent imaging contrast (PIC) mapping with unprecedented contrast, signal-to-noise ratio, and magnification. O and Ca spectra are presented for six calcium carbonate minerals: aragonite, calcite, vaterite, monohydrocalcite, and both hydrated and anhydrous amorphous calcium carbonate. The crystalline minerals reveal excellent agreement of the extent and direction of polarization dependences in simulated and experimental XANES spectra due to X-ray linear dichroism. This effect is particularly strong for aragonite, calcite, and vaterite. In natural biominerals, oxygen PIC-mapping generated high-magnification maps of unprecedented clarity from nacre and prismatic structures and their interface in Mytilus californianus shells. These maps revealed blocky aragonite crystals at the nacre-prismatic boundary and the narrowest calcite needle-prisms. In the tunic spicules of Herdmania momus, O PIC-mapping revealed the size and arrangement of some of the largest vaterite single crystals known. O spectroscopy therefore enables the simultaneous measurement of chemical and orientational information in CaCO3 biominerals and is thus a powerful means for analyzing these and other complex materials."

According to the news editors, the research concluded: "As described here, PIC-mapping and spectroscopy at the O K-edge are methods for gathering valuable data that can be carried out using spectromicroscopy beamlines at most synchrotrons without the expense of additional equipment."

For more information on this research see: Oxygen Spectroscopy and Polarization-Dependent Imaging Contrast (PIC)-Mapping of Calcium Carbonate Minerals and Biominerals. Journal of Physical Chemistry B, 2014;118(28):8449-8457. Journal of Physical Chemistry B can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Journal of Physical Chemistry B - www.pubs.acs.org/journal/jpcbfk)

Our news journalists report that additional information may be obtained by contacting R.T. DeVol, University of Wisconsin, Dept. of Chem, Madison, WI 53706, United States. Additional authors for this research include R.A. Metzler, L. Kabalah-Amitai, B. Polcroy, Y. Politi, A. Gal, L. Addadi, S. Weiner, A. Fernandez-Martinez, R. Demichelis, J.D. Gale, J. Ihli, F.C. Meldrum, A.Z. Blonsky, C.E. Killian, C.B. Salling, A.T. Young, M.A. Marcus and (see also Anions).

Keywords for this news article include: Anions, Madison, Alkalies, Minerals, Wisconsin, Chalcogens, United States, Carbonic Acid, Calcium Carbonate, Calcium Compounds, North and Central America

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Life Science Weekly


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