Preparation and Characterization of Ultra-Fine 3-Nitro-1,2,4-Triazole-5-One Crystals Using a Novel Ultrasonic–Assisted Spray Technology

Table 1

Morphology and crystal size of NTO crystals obtained using different solvents.

Solvent	Morphology	Average particle size (μm)
DMSO	Cuboid	1.25
NMP	Irregular	0.43
DMF	Polyhedral	0.20
VDMSO^a:VDMF^a (2 : 1)^b	Cuboid	4.47
VDMSO:VDMF (1 : 1)^b	Cuboid	1.62
VDMSO:VDMF (1 : 2)^b	Irregular	1.28

^a V_DMSO and V_DMF refer to the volume of DMSO and DMF; ^bV_DMSO:V_DMF (2 : 1), V_DMSO:V_DMF (1 : 1), and V_DMSO:V_DMF (1 : 2) refer to the volume ratio of DMSO to DMF that is 2 : 1, 1 : 1, and 1 : 2, respectively.