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Buckybomb: reactive molecular dynamics simulation

ReaxFF MD of heated nitrofullerene C60(NO2)12 shows an ultrafast ‘nano-explosion’: NO2 rearrangement, NO release, surface CO/CO2 chemistry, and eventual C2 at extreme temperature; initiation temperature and energy release depend on composition and density.

Summary

This work uses ReaxFF reactive molecular dynamics to study decomposition of a nitrofullerene, C60(NO2)12, as a model nanoscale energetic system. Upon rapid heating, the simulations show a violent energy release on picosecond timescales with large rises in temperature and pressure. The authors describe a stepwise chemical mechanism starting from NO2 isomerization, NO emission, CO formation on the cage, oxidation chemistry involving NO2, CO2 liberation as the cage fragments, and at the highest temperatures diatomic carbon from CO2-derived chemistry (as summarized in the abstract).

The study argues that initiation temperature and released energy depend on composition and packing density, offering a qualitative picture of how nanoscale energetic materials might behave differently from bulk explosives.

Methods

Source files / DOI alignment

  • Local PDF: papers/ReaxFF_others/ReaxFF_nanobomb.pdf; extract: normalized/extracts/2014reaxff-venue-paper_p1-2.txt.
  • Authoritative bibliographic record: DOI 10.1021/acs.jpclett.5b00120 (J. Phys. Chem. Lett., 2015), which may differ from the filename year in the slug.

Reactive MD system

  • ReaxFF reactive MD of nitrofullerene C\(_{60}\)(NO\(_2\))\(_{12}\) as a model nanoscale energetic (Summary).

Thermal initiation protocol (qualitative)

  • Simulations apply rapid heating to trigger an ultrafast energy-release sequence; cell, thermostat, timestep, and heating rate are specified in the JPCL article beyond the one-page extract.

Observables

Trajectories resolve species evolution, temperature, and pressure rises associated with the decomposition cascade described in the abstract (Findings).

1 — MD application (ReaxFF reactive MD)

The preprint-style PDF (papers/ReaxFF_others/ReaxFF_nanobomb.pdf) and one-page extract normalized/extracts/2014reaxff-venue-paper_p1-2.txt document reactive molecular dynamics of C\(_{60}\)(NO\(_2\))\(_{12}\) under rapid heating leading to an ultrafast energy release. Engine (LAMMPS/VASP/etc.), system size in atoms, PBC, timestep in fs, thermostat, barostat, staged equilibration vs heating ramps, and total trajectory length: N/A — not contained in the checked-in extract; the authoritative protocol is in the J. Phys. Chem. Lett. article (DOI 10.1021/acs.jpclett.5b00120, 2015). Ensemble: NVT vs NVE vs NPT labeling is N/A — not printed on the one-page extract—confirm in the journal PDF. Electric field / enhanced sampling: N/A — not indicated on the extract for this heating-driven decomposition study.

2 — Force-field training

N/A — the indexed excerpt is an application note for ReaxFF on a nitrofullerene; it does not summarize a new parameter fit on that page.

Findings

Upon heating, C\(_{60}\)(NO\(_2\))\(_{12}\) undergoes a violent decomposition that drives large increases in temperature and pressure on tens-of-picosecond timescales. The authors describe a stepwise chemical mechanism beginning with NO\(_2\) group isomerization into C–O–N–O, followed by NO release and CO formation on the fullerene surface, further oxidation involving NO\(_2\), CO\(_2\) liberation as the cage fragments, and at the highest temperatures diatomic carbon formation from CO\(_2\)-related chemistry (abstract, extract).

Sensitivity. The abstract states initiation temperature and released energy depend strongly on chemical composition and material density—a lever relevant to nanoscale energetic packing.

Comparisons / limitations (corpus). The local filename/slug predates the JPCL bibliographic record; quantitative benchmarks versus experiment are N/A — not present on the one-page extract—use the version-of-record PDF for any validation discussion.

Limitations

  • The registered PDF may correspond to a preprint-era document name (ReaxFF_nanobomb.pdf); cite the journal article via DOI for authoritative metadata.
  • Quantitative predictions are classical reactive FF-level and should be validated for any quantitative safety or performance use.

Relevance to group

Illustrates ReaxFF applied to energetic nanocarbon chemistry and extreme transient heating scenarios.

Reader notes (navigation)

  • Published JPCL record: DOI below (2015). An arXiv preprint also exists for earlier dissemination.

Citations and evidence anchors