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Production of Nanocrystalline RDX by Rapid Expansion of Supercritical Solutions
Author(s) -
Stepanov Victor,
Krasnoperov Lev N.,
Elkina Inga B.,
Zhang Xuyean
Publication year - 2005
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/prep.200500002
Subject(s) - supercritical fluid , materials science , nanocrystalline material , diffraction , supercritical carbon dioxide , particle size distribution , nozzle , chemical engineering , scanning electron microscope , analytical chemistry (journal) , melting point , particle size , nanotechnology , composite material , optics , chromatography , chemistry , thermodynamics , organic chemistry , physics , engineering
Nanoscale crystals of cyclotrimethylenetrinitramine (RDX) were produced by Rapid Expansion of Supercritical Solutions (RESS). The experiments were performed by expansion of supercritical solutions of RDX in carbon dioxide through sapphire nozzles (ID: 100 and 150 μm) at pressures of 15.0–29.5 MPa and temperatures of 343–348 K. Recrystallized particles were characterized by Field Emission Scanning Electron Microscopy (FESEM), X‐ray diffraction, HPLC and melting point analysis. The process produced particles with a mean size in the range 110–220 nm and a narrow size distribution. The product was crystalline as determined by X‐ray diffraction. The effect of process conditions ( T, P , nozzle diameter) on the crystal size distribution was determined.