[meteorite-list] The fourth installment on the topic about nanodiamonds.

[Shawn Alan]

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,prheck at 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
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