AVS 63rd International Symposium & Exhibition
    Nanometer-scale Science and Technology Tuesday Sessions
       Session NS-TuM

Paper NS-TuM6
Time-resolved Small Angle X-ray Scattering during the Formation of Detonation Nanodiamond

Tuesday, November 8, 2016, 9:40 am, Room 101D

Session: Nanodiamonds, Thin Films and Electronics (8:20–10:00 am)/Health and Environmental Impact of Nanotechnology (11:00 am–12:20 pm)
Presenter: Michael Bagge-Hansen, Lawrence Livermore National Laboratory
Authors: M. Bagge-Hansen, Lawrence Livermore National Laboratory
M. Nielsen, Lawrence Livermore National Laboratory
L. Lauderbach, Lawrence Livermore National Laboratory
R. Hodgin, Lawrence Livermore National Laboratory
S. Bastea, Lawrence Livermore National Laboratory
L. Fried, Lawrence Livermore National Laboratory
D. Hansen, Lawrence Livermore National Laboratory
C. May, Lawrence Livermore National Laboratory
T. Graber, Washington State University
B.J. Jensen, Los Alamos National Laboratory
R. Gustavsen, Los Alamos National Laboratory
D. Dattelbaum, Los Alamos National Laboratory
E. Watkins, Los Alamos National Laboratory
M. Firestone, Los Alamos National Laboratory
J. Ilavsky, Argonne National Laboratory
T. van Buuren, Lawrence Livermore National Laboratory
T.M. Willey, Lawrence Livermore National Laboratory
Correspondent: Click to Email
Most commercial nanodiamond originates from detonation of high explosives, particularly from RDX/TNT mixtures. Models suggest that the phase, crystallinity, and morphology of carbon is strongly dependent on the type of high explosive used and the exact evolution of temperature and pressure conditions during the very early stages of detonation; however, characterization of carbon condensation under the extreme conditions present at 100 ns timescales has been technically challenging. Using time-resolved, synchrotron-based small-angle x-ray scattering, we present a comparative survey of early time carbon condensation from three CHNO high explosives: HNS, Comp B (60% RDX, 40% TNT), and DNTF. We also extend this study to post-mortem TEM analysis of recovered carbon condensates. At later times, the size of particles extracted from SAXS compares favorably with our microscopy results. At early times, models predict that this array of explosives should provide graphitic, nanodiamond, and liquid carbon phases, respectively; our analysis of time resolved SAXS is remarkably consistent with these computational predictions.

This work was performed under the auspices of the US DOE by LLNL under Contract DE-AC52-07NA27344.