Hello Listers Here is my fourth installment on the topic of nanodiamonds. Over the course of the past couple of weeks, I have presented topics and articles related to the formation, the foundation of nanodiamond classification, and how nanodiamonds are key in meteoritical science research. The fourth installment is a great article that takes these discoveries of presolar nanodiomands and nanodiamonds that were formed within the Solar System, and explains which meteorites might contain presolar nanodiamonds. Scientists have the ability to recognize and differentiate between the two with new technologies which is explained in this article. Down below is the title and an abstract to the article. ATOM-PROBE TOMOGRAPHIC ANALYSES OF PRESOLAR SILICON CARBIDE GRAINS AND METEORITIC NANODIAMONDS – FIRST RESULTS ON SILICON CARBIDE.P. R. Heck1,2, M. J. Pellin1,3,A. M. Davis1,2,4, I. Martin5, L. Renaud5, R. Benbalagh5, D. Isheim6, D. N. Seidman6, J. Hiller3, T. Stephan1,2,3, R. S. Lewis1,4, M. R. Savina1,3, A. Mane3, J. Elam3, F. J. Stadermann7,8, X. Zhao7,8, T. L. Daulton8,9, S. Amari7,8,1Chicago Center for Cosmochemistry, 2Dept. of Geophysical Sciences, Univ. of Chicago, Chicago, IL, USA,prh...@uchicago.edu. 3Materials Science Division, Argonne National Laboratory, Argonne, IL, USA. 4EnricoFermi Institute, Univ. of Chicago, Chicago, IL, USA. 5LA-WATAP Applications Laboratory, CAMECA France, Gennevilliers Cedex, France. 6Northwestern Univ. Center for Atom-Probe Tomography, Dept. of Materials Science & Engineering, Northwestern Univ., Evanston, IL, USA. 7Laboratory for Space Sciences, 8Physics Dept., 9Center for Materials Innovation, Washington Univ., Saint Louis, MO, USA. Introduction: The chemistry of presolar grains is studied with analytical instruments that provide very high spatial resolution, such as the NanoSIMS ion microprobe (~50 nm spatial resolution). Even this resolution is not sufficient to analyze, e.g., the isotopic composition of small subgrains (diam. of a few to tens of nm) within presolar grains or individual meteoritic nanodiamonds (avg. diam. ~3 nm). A knowledge of carbon isotope ratios in individual meteoritic nanodiamonds would help to resolve a fundamental question about the origin of nanodiamonds: What fraction of the nanodiamonds formed in the solar nebula and what fraction is presolar? Such small samples need to be studied with sub-nm spatial resolution. Link to the whole article: http://www.lpi.usra.edu/meetings/lpsc2010/pdf/2112.pdf Shawn Alan IMCA 1633 eBaystore http://shop.ebay.com/photophlow/m.html?_nkw=&_armrs=1&_from=&_ipg=&_trksid=p4340
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