Investigation of the crystallization of RDX during spray drying

Preparation and Characterization of Nanoenergetics Based Composition B

“…This is consistent with previous reports of nanoenergetic materials prepared by spray drying. The formation of nanoscale crystals is attributed to the rapid solvent evaporation and 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 subsequent crystal nucleation in spray drying [7,12,13]. Compared to other spray-dried energetic materials which are typically spherical, the irregular morphology of N-Comp B molding powder is likely due to the fusion of particles because TNT has a relatively low melting point of~81 8C [17].…”

“…Measures that can decrease the number density of voids therefore are expected to further reduce the shock sensitivity. This can be achieved by adding a small amount of polymeric materials during spray drying for the purpose of coating the crystals [12]. The polymer coating is expected to flow and fill the voids during compaction.…”

“…The control of TNT crystal size and void formation is also a difficult task 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 during solidification [2,3]. Our approach was to prepare Comp B molding powder, consisting of nanoscale crystals of RDX and TNT, by a one-step spray drying method as described previously [7,12] followed by mechanical compaction. The molding powder prepared by spray drying and the compacted form were characterized.…”

The Effect of Ionic Strength and pH on the Electrostatic Stabilization of NanoRDX

“…In recent years, research has shown that nanoenergetics exhibit improved critical diameter, reduced initiation insensitivity, and higher mechanical strength as compared to conventional coarse materials [1][2][3][4][5][6]. A variety of methods have been developed for the production of nanoenergetic materials including rapid expansion of supercritical solutions [7], bead milling [8] and spray drying [9]. The method selected to produce nanoRDX for this work is bead milling, as it is highly scalable and easily controlled.…”

Study on Dust Production Process and Removal Equipment of Spray Drying System in Ceramic Industry

“…It is widely used in the chemical, food, household care products, pharmaceutical and ceramics industries [1][2][3]. In the building ceramics industry, spray drying transforms the slurry containing solids into dry particles using a hot gas.…”