Two ultrafine HNS particles with different purity were prepared by Laval nozzle assisted precipitation method. SEM (Scanning Electron Microscope), laser granularity measurement, high performance liquid chromatograph (HPLC),dynamic contact angle measurement and X-ray diffraction (XRD) were employed to characterize the ultrafine HNS samples. The filtration speed, impact sensitivity, short pulse shockwave sensitivity and thermal stability of the two ultrafine HNS particles were also studied and contrasted. Results show that the two ultrafine HNS samples have the similar particle size, morphology and crystal type. However, the sample with higher purity has higher surface energy and lower Zeta potential, which results in the higher filtration speed. Both impact and short duration shock sensitivity of ultrafine raw HNS are lower than those of ultrafine purified HNS. Moreover, compared with ultrafine raw HNS, the thermal decomposition peak temperatures of ultrafine purified HNS at different heating rates decrease slightly, the activation energy hardly varies.
ultrafine HNS, purity, properties