RT Journal Article
ID 5b8da80118378ded
A1 Cortopassi, Andrew C.
A1 Ferrara, Peter J.
A1 Wawiernia, Timothy M.
A1 Essel, Jonathan T.
T1 SYNTHESIS OF NANO-SIZED RDX USING AN ULTRA-HIGH-PRESSURE RESS SYSTEM
JF International Journal of Energetic Materials and Chemical Propulsion
JO IJEMCP
YR 2008
FD 2008-02-01
VO 7
IS 1
SP 39
OP 54
AB It is advantageous to synthesize nano-sized energetic ingredients for the development of insensitive munitions. Some parameters of crystalline particles that affect the thermal and shock sensitivity are size and shape of crystalline particles, particle size distribution, and defects in individual crystals. Any internal cavities in the crystalline structure are subjected to initiation by external stimuli. Shock or mechanical impacts to a crystalline particle with defects can cause hot spot generation, which leads to initiation of ignition. One of the methods under present investigation to produce nano-sized particles is the rapid expansion of a supercritical solution (RESS) process. In this study, an ultra-high-pressure (up to 207 MPa) RESS system has been developed and tested. Even though collection of nano-sized particles represents a major challenge, an efficient particle recovery system with the formation of dry ice from the supercritical CO<sub>2</sub> solution has been successfully developed. Collected RDX samples have been measured by dynamic light scattering (DLS) technique to determine particle size distributions. Examination of crystalline structure and particle size were performed by using scanning electron microscopy (SEM). Particles sizes from 93 to 509 nm were obtained, depending upon the nozzle size, upstream temperature, and pressure controlled under the expansion process.
PB Begell House
LK https://www.dl.begellhouse.com/journals/17bbb47e377ce023,347510e813dc34a0,5b8da80118378ded.html