Formation Mechanism of Anisotropic RDX-TNT Core-Shell Nanoparticles and their Influence onto Nanodiamond Detonation Syntheses
2020
Mixtures of RDX and TNT or hexolite
mixtures are well known precursors for nanodiamond detonation syntheses. In
this study diverse nanoscale hexolite mixtures varying in mass ratios of RDX
and TNT are synthesized via Spray Flash Evaporation. The hexolite mixtures are
characterized by confocal Raman spectroscopy and tip-enhanced Raman
spectroscopy (TERS) to obtain information about their molecular structure
composition. The marker bands of pristine RDX and TNT enable the identification
and distinction of both compounds in the Raman spectra. Confocal Raman
spectroscopy indicates an intermixture of RDX and TNT molecules on the
nanoscale since both marker bands are detected in all spectra. TERS
investigations of single hexolite particles reveal that the particle surfaces
are mainly composed of TNT. The comparison of confocal Raman and TERS results
suggests that (depending on the mass ratio) hexolite particles are either
inhomogeneous patchy RDX/TNT nanoparticles or anisotropic RDX/TNT core-shell
nanoparticles. A building mechanism to explain the formation/growth of those
nanoparticles is derived from the spectroscopic data and the dynamics of the
SFE process. Finally, a correlation between the TNT shell thickness, the
symmetry of the anisotropic hexolite precursor nanoparticles, and the resulting
nanodiamond sizes is discussed in detail.
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