Vanadium pentoxide gel was synthesized by using sol-gel method,and freezed drying to get the vanadium pentoxide xerogel,which were ammonolyzed to vanadium nitride nanoparticals in high purity anhydrous NH3 atmosphere....Vanadium pentoxide gel was synthesized by using sol-gel method,and freezed drying to get the vanadium pentoxide xerogel,which were ammonolyzed to vanadium nitride nanoparticals in high purity anhydrous NH3 atmosphere.The samples were characterized by transmission electron microscope(TEM)and X-ray diffraction(XRD),the vanadium nitride nanoparticles have homogeneous spherical structure with an average diameter of 12 nm,and its crystal structure belongs to face-cubic.展开更多
Morphology controlled synthesis of nanoparticles of powerful high energetic compounds(HECs) such as l,3,5-trinitro-l,3,5-triazinane(RDX) and 1,3,5,7-tetranitro-l,3,5,7-tetrazocane(HMX) were achieved by a simple solven...Morphology controlled synthesis of nanoparticles of powerful high energetic compounds(HECs) such as l,3,5-trinitro-l,3,5-triazinane(RDX) and 1,3,5,7-tetranitro-l,3,5,7-tetrazocane(HMX) were achieved by a simple solvent—antisolvent interaction(SAI) method at 70 ℃.The effects of different solvents on particle size and morphology of the prepared nano-HECs were studied systematically.Particle size and morphology of the nano-HECs was characterized using field emission scanning electron microscopy(FE-SEM) imaging.X-ray diffraction(XRD) and Fourier transform infrared(FTIR) spectroscopy studies revealed that RDX and HMX were precipitated in their most stable polymorphic forms,i.e.a and P,respectively.Thermogravimetric analysis coupled with differential scanning calorimetry(TGA-DSC) studies showed that the thermal response of the nanoparticles was similar to the respective raw-HECs.HEC nanoparticles with spherical and rod shaped morphology were observed under different solvent conditions.The mean particle size also varied considerably with the use of different solvents.展开更多
文摘Vanadium pentoxide gel was synthesized by using sol-gel method,and freezed drying to get the vanadium pentoxide xerogel,which were ammonolyzed to vanadium nitride nanoparticals in high purity anhydrous NH3 atmosphere.The samples were characterized by transmission electron microscope(TEM)and X-ray diffraction(XRD),the vanadium nitride nanoparticles have homogeneous spherical structure with an average diameter of 12 nm,and its crystal structure belongs to face-cubic.
基金Financial assistance from ARMREB(DRDO) under grant No.ARMREB/CDSW/2012/149
文摘Morphology controlled synthesis of nanoparticles of powerful high energetic compounds(HECs) such as l,3,5-trinitro-l,3,5-triazinane(RDX) and 1,3,5,7-tetranitro-l,3,5,7-tetrazocane(HMX) were achieved by a simple solvent—antisolvent interaction(SAI) method at 70 ℃.The effects of different solvents on particle size and morphology of the prepared nano-HECs were studied systematically.Particle size and morphology of the nano-HECs was characterized using field emission scanning electron microscopy(FE-SEM) imaging.X-ray diffraction(XRD) and Fourier transform infrared(FTIR) spectroscopy studies revealed that RDX and HMX were precipitated in their most stable polymorphic forms,i.e.a and P,respectively.Thermogravimetric analysis coupled with differential scanning calorimetry(TGA-DSC) studies showed that the thermal response of the nanoparticles was similar to the respective raw-HECs.HEC nanoparticles with spherical and rod shaped morphology were observed under different solvent conditions.The mean particle size also varied considerably with the use of different solvents.
