Novel Energetic Materials Research
- High Energy Density Materials: the materials made of low z extended solids in three-dimensional network structures such as cubic gauche-nitrogen and extended metal hydrides:
- Energetic Materials: including high explosives (such as nitromethane, TNT, RDX, etc.); implovised explosive materials (such as hydrogen peroxide and ammonium nitrates); detonation products including carbon dioxide, water, nitrogen, carbon, and their mixtures
- Superhard Solids: the materials like diamond and cubic boron nitrides as
- Functional Intermetallics: of d- and f-electron metals in ordered, disordered and layered forms.
Application of high pressure significantly alters the interatomic distance and thus the nature of intermolecular interaction, chemical bonding, molecular configuration, crystal structure, and stability of solid. With modern advances in high-pressure technologies, it is feasible to achieve a large (often up to aseveral-fold) compression of lattice, at which condition material can be easily forced into a new physical and chemical configuration. The high-pressure thus offers enhanced opportunities to discover novel materials, both stable and metastable ones, and to tune exotic properties in a wide-range of atomistic length scale, substantially greater than (often being several orders of) those achieved by other thermal (varing temperatures) and chemical (varying composition or making alloys) means.
These efforts are currently supported by
- DTRA (BRBAA08-E-2-0059) for Studies of Novel Functional Extended Solids at Extreme Conditions.
- DHS-Alert (504926) for Chemical and Shock Mitigation of Nonconventional Explosives Threats.
- DARP (W911NF-09-C-0033) for Investigation of Chemical Performance of Reactive Materials Structure.
on high energy density materials
- Novel 2D and 3D Extended Phases and Metallization of XeF2 at High Pressures and Temperatures, Minseob Kim, Mathew Debessai, Choong-Shik Yoo, submitted (2009).
- Extended Networks of Nitrogen: Reddish Amorphous- and Transparent Cubic Gauche Nitrogen Polymers, Magnus J. Lipp, Jae-Hyun Klepeis, Bruce Baer, Hyunchae Cynn, William J. Evans, Valentin Iota, and Choong-Shik Yoo, Phys. Rev. B. 76, 14113 (2007).
- Pressure-Induced Disproportion of Carbon Monoxide to Carbon Dioxide and Energetic Lactonic Polymer, W.J. Evans, M.J. Lipp, C. S. Yoo, H. Cynn, J. Herbert, R.J. Maxwell, M.F. Nicol, Chem. Mater. 18, 2520 (2006)
- High-Energy-Density Extended CO Solid, M.J. Lipp, W. J. Evans, B. Baer, and C.S. Yoo, Nature Materials 4, 211 (2005)
on conventional and implovised energetic materials
- High Stability of Single Wall Carbon Nanotube in Quasi-Hydrostatic Conditions, Jing-Yin Chen, Minseob Kim, and Choong-Shik Yoo, Chem. Phys. Lett. (2009) in print.
- High Pressure-induced Phase Transitions in Pentaerythritol: X-ray and Raman Studies, Z. A. Dreger, Y. M. Gupta, C.-S. Yoo, and H. Cynn, J. Phys. Chem. B109, 2258 (2005)
- A Quantum Mechanical Molecular Dynamics Study of Binary Collisions of Pentaerythrol Tetranitrate (PETN): Its Correlation to Shock Sensitivity, C. J. Wu, Francis H. Ree and Choong-Shik Yoo,Propellants, Explosives, Pyrotechnics 29. 296 (2004).
- Anisotropic Shock Sensitivity and Detonation Temperature of Pentaerythrol Tetranitrate (PETN) Single Crystal, C.S. Yoo, N.C. Holmes, C.P. Souers, C.J. Wu, F.H. Ree, J.J. Dick, J. Appl. Phys., 88, 1 (2000).
- Equation of State, Phase Transition, Decomposition of b-HMX(Octahydro-1,3,5,7-Tetranitro-1,3,5,7-Tetrazocine) at High Pressures, C.S. Yoo, and H. Cynn, J. Chem. Phys, 111, 10229 (1999).
- Phase Transition and Decomposition of 90 % Hydrogen Peroxide at High Pressures, H. Cynn, C.S. Yoo, and S.A. Sheffield, J. Chem. Phys. 110, 6836 (1999).