National Quality Supervision and Inspection Center for Industrial Explosive Materials

Nanjing, China

National Quality Supervision and Inspection Center for Industrial Explosive Materials

Nanjing, China
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Zhang W.,Nanjing University of Posts and Telecommunications | Ouyang J.,Shandong University | Cheng H.,Shandong University | Yang Q.,Shandong University | And 3 more authors.
Japanese Journal of Applied Physics | Year: 2017

Heteroepitaxial BaTiO3 ferroelectric films with (001), (110), and (111) orientations were grown on SrRuO3-buffered SrTiO3 substrates by magnetron sputtering. The leakage current and interface charge behaviors were systematically investigated. Without a discernible orientation-dependence behavior, the leakage current behaviors were all well described by a modified Schottky-contact model. On the basis of this theory, the interface charge state parameters, including dynamic dielectric constant, potential barriers, depletion layer width, effective space-charge density and hole concentration, and their evolution behaviors were analyzed in detail. They all exhibited anisotropic characteristics and were proved to be essentially attributed to the macrophysical properties of BaTiO3 film heterostructures. © 2017 The Japan Society of Applied Physics.


Wu Q.,Nanjing University of Science and Technology | Tan L.,Nanjing University of Science and Technology | Xu S.,Nanjing University of Science and Technology | Xu S.,National Quality Supervision and Inspection Center for Industrial Explosive Materials | And 2 more authors.
Journal of Energetic Materials | Year: 2017

Numerous accidents of emulsion explosive (EE) are attributed to uncontrolled thermal decomposition of ammonium nitrate emulsion (ANE, the intermediate of EE) and EE in large scale. In order to study the thermal decomposition characteristics of ANE and EE in different scales, a large-scale test of modified vented pipe test (MVPT), and two laboratory-scale tests of differential scanning calorimeter (DSC) and accelerating rate calorimeter (ARC) were applied in the present study. The scale effect and water effect both play an important role in the thermal stability of ANE and EE. The measured decomposition temperatures of ANE and EE in MVPT are 146°C and 144°C, respectively, much lower than those in DSC and ARC. As the size of the same sample in DSC, ARC, and MVPT successively increases, the onset temperatures decrease. In the same test, the measured onset temperature value of ANE is higher than that of EE. The water composition of the sample stabilizes the sample. The large-scale test of MVPT can provide information for the real-life operations. The large-scale operations have more risks, and continuous overheating should be avoided. © 2017 Taylor & Francis Group, LLC


Tan L.,Nanjing University of Science and Technology | Liu D.-B.,Nanjing University of Science and Technology | Xu S.,Nanjing University of Science and Technology | Xu S.,National Quality Supervision and Inspection Center for Industrial Explosive Materials | And 3 more authors.
Hanneng Cailiao/Chinese Journal of Energetic Materials | Year: 2017

To investigate the effect of potassium chloride (KCl) on the detonation performance and thermal stability of ammonium nitrate (AN), modified AN containing KCl was prepared via, solution mixing method and mechanical mixing method. The detonation performance and thermal stability of AN/KCl mixtures were investigated by differential scanning calorimetry (DSC), accelerating rate calorimeter r(ARC), the United Nations (UN) gap test and Koenen test. Results show that the exothermic peak temperature of modified AN containing 10% KCl obtained by solution mixing method was decreased from 286.75℃ to 250.84℃, while the onset temperature of modified AN was increased from 204.33℃ to 220.17℃, revealing that KCl can promote the thermal decomposition process of AN and doesn't affect first step of the thermal decomposition of AN. The detonation test results show that KCl can reduce the thermal sensitivity of AN and the detonation propagation ability to a certain extent. Compared with mechanical mixing method, to suppress the detonation of AN, the amount of KCl required can reduce by 20% for solution mixing method. The mixing method has an important effect on the detonation characteristics of AN. © 2017, Editorial Board of Chinese Journal of Energetic Materials. All right reserved.


Tan L.,Nanjing University of Science and Technology | Xu S.,Nanjing University of Science and Technology | Xu S.,National Quality Supervision and Inspection Center for Industrial Explosive Materials | Xia L.,Nanjing University of Science and Technology | And 3 more authors.
Science and Technology of Energetic Materials | Year: 2017

A study has been undertaken on the effect of mixing methods on the IV - III transition of ammonium nitrate (AN). Potassium chloride (KC1) and monoammonium phosphate (MAP) were mixed with ammonium nitrate (AN) by different mixing methods. The results of differential scanning calorimetry (DSC) showed that the crystals have different transition behaviour. When the samples were mixed by mechanical mixing method.the temperature of IV↔III transition was increased. For the solution mixing method, the IV-↔III transition of AN-8%KC1 mixture was disappear, while the IV↔III transition temperature of AN-MAP mixture was reduced to a lower temperature. The morphology changes and structural properties were further analyzed by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). The present study showed that mixing methods, additives, thermal cycling and hydrogen-bond have an important influence on the IV-∗III transition of AN.


Cao W.,Nanjing University of Science and Technology | Gao W.,Dalian University of Technology | Liang J.,Nanjing University of Science and Technology | Xu S.,Nanjing University of Science and Technology | And 2 more authors.
Journal of Loss Prevention in the Process Industries | Year: 2014

To reveal the flame-propagation behavior and the thermal-radiation effects during coal-dust explosions, two coal-dust clouds were tested in a semi-enclosed vertical combustion tube. A high-speed video camera and a thermal infrared imaging device were used to record the flame-propagation process and the thermal-radiation effects of the fireball at the combustion-tube outlet. The flame propagated more quickly and with a higher temperature in the more volatile coal-dust cloud. The coal-dust concentration also significantly affected the propagation behavior of the combustion zone. When the coal-dust concentration was increased, the flame-propagation velocity and the fireball temperature increased before decreasing overall. Based on the experimental results, a dynamic model of the thermal radiation was employed to describe the changes in the fireballs quantitatively and to estimate the thermal-radiation effects during coal-dust explosions. © 2014 Elsevier Ltd.


Qiu S.,Nanjing University of Science and Technology | Qiu S.,National Quality Supervision and Inspection Center for Industrial Explosive Materials | Wei J.,Jiangsu Academy of Environmental Sciences | Pan F.,Nanjing University of Science and Technology | And 4 more authors.
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2013

In the present work, the experimental and theoretical studies on the structure, vibrations, NMR and HOMO-LUMO analysis of 3,3′,5,5′- tetrabromobisphenol A (TBBPA) are presented. The FT-IR (400-4000 cm -1) and FT-Raman (100-4000 cm-1) spectra of TBBPA were recorded. The molecular geometry, vibrational frequencies were calculated by using density functional theory (DFT) method with the 6-31G(d) basis set. The optimized geometric properties, scaled vibrational wavenumbers, IR intensities, Raman activities show good agreement with the experimental data. The assigned vibrational modes of the IR and Raman spectra were compared with the corresponding properties of the polybrominated diphenyl ethers (PBDEs). Comparative analysis indicated that the red shift of C-Br vibration could probably be ascribed to the further electronic density equalization due to the p-π conjugation between O atom and the benzene. The natural bonding orbital (NBO) analysis demonstrated that the intermolecular hyperconjugative interactions are mainly formed by the orbital overlap between σ (O-H), σ- (C-C), π (C-C), π- (C-C) bond orbitals. Compared to the higher E(2) value (33.65-34.82 kcal/mol) originated from LP(2)O to π- (C-C), the one (E(2): 8.23-9.73 kcal/mol) from LP(3)Br and π- (C-C) contributes to the preferential tendency of C-Br breakage to the C-O breakage in the transformation. The calculated NMR results obtained on the 6-31G(d) level proves good agreement with the experimental data (r2 = 0.999). Analysis of isosurface of the related orbital shows that all the main excitation exhibit π-π- character localized on the benzene rings. © 2012 Elsevier B.V. All rights reserved.


Tan L.,Nanjing University of Science and Technology | Xia L.-H.,Nanjing University of Science and Technology | Wu Q.-J.,Nanjing University of Science and Technology | Wu Q.-J.,National Quality Supervision and Inspection Center for Industrial Explosive Materials | And 3 more authors.
Journal of Loss Prevention in the Process Industries | Year: 2015

A study has examined the effect of urea on the thermal stability and detonation characteristics of ammonium nitrate (AN). The thermal decomposition temperature and surface morphology of samples were investigated by differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). For further research on the thermal sensitivity and shock sensitivity of the samples, the Koenen test and UN gap test were conducted. The results indicate that urea can substantially increase the thermal stability of AN (the greatest exothermic peak is increased by more than 100 °C) and reduce the thermal sensitivity of AN. However, AN-50wt. % urea mixtures can still produce a steady detonation in the UN gap test. Urea cannot reduce the ability to propagate a detonation. Possible explanations for these results are discussed. © 2015 Elsevier Ltd.


Jiao S.,Nanjing University of Science and Technology | Jiao S.,National Quality Supervision and Inspection Center for Industrial Explosive Materials | Wang Y.,Nanjing University of Science and Technology | Chen C.,Nanjing University of Science and Technology | And 4 more authors.
Journal of Molecular Structure | Year: 2014

This study reports a Graphene Oxide Mediated SERS (GOMS) Substrate supporting silver nanoparticles (AgNPs), which is characterized with the relatively clean surface of nanoparticles and formation of stable suspension in the detection. Moreover the tight anchoring of silver nanoparticles on the platform by a multiple oxygen-containing groups on GO carbon grid favors for the generation of large number of "hot" spots. We demonstrate that anchoring of the 4-mercaptopyridine (4-Mpy) analyte at these system leads to a pronounced intensification of its Raman emission using described SERS assay. Most impressively, acting as a new type of SERS substrate, the GOMS Substrate can disperse well in water during the detection process, which makes the Raman signals very uniform. This work not only shows that target molecule such as 4-Mpy has a strong interaction with the nanoparticle surface can be detected quickly and accurately with high sensitivity and stability, but also show SERS activity successfully for Bovine Serum Albumin (BSA), which interaction with nanoparticle surface is weak, in about physiological saline of Label-free detection. The results reported herein may lead to many applications in SERS techniques. © 2014 Elsevier B.V. All rights reserved.


Cao W.-G.,Nanjing University of Science and Technology | Xu S.,Nanjing University of Science and Technology | Xu S.,National Quality Supervision and Inspection Center for Industrial Explosive Materials | Liang J.-Y.,Nanjing University of Science and Technology | And 4 more authors.
Baozha Yu Chongji/Explosion and Shock Waves | Year: 2014

Two kinds of different volatile pulverized coal were tested in a semi-enclosed vertical combustion tube. And a high-speed video camera and an infrared imager were used to record the flame propagation process and the spatial flame temperature distribution, respectively. The changes of the flame propagation velocity and temperature with time were analyzed for the two different coal dust clouds during combustion. Experimental results show that the flame propagation velocity and flame temperature of the high-volatile coal dust cloud are higher than those of the low-volatile coal dust cloud under the same experimental conditions. And the volumic mass of coal dust cloud as well as ignition energy can affect the flame propagation. With increasing the volumic mass of coal dust cloud, the flame propagation velocity and the flame temperature increase at first and then decrease, oscillating phenomena appear in the next process. With increasing the ignition energy, the flame propagation velocity and flame temperature increase. Based on the experimental data, an empirical formula was proposed for calculating the flame propagation velocity and flame temperature under certain conditions. ©, 2014, Explosion and Shock Waves. All right reserved.


Cao W.,Nanjing University of Science and Technology | Huang L.,Nanjing University of Science and Technology | Liang J.,Nanjing University of Science and Technology | Miao N.,Nanjing University of Science and Technology | And 3 more authors.
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | Year: 2014

In order to investigate the explosion parameters of coal dust in the spherical sealed container, the explosion rule and explosion mechanism of two kinds of coal dust with different volatile, ignition quality and explosion suppression agent were studied in a 20 L sphere explosion test units. The results show that the explosion pressure increased with the increasing of ignition energy. Under the same ignition quality, the explosion pressure firstly increased and then decreased. The explosion pressure of high volatile coal dust is bigger than that of low volatile coal dust. The explosion severity of coal dust with 9% methane-air mixtures is stronger than that with air mixture. Adding inert material SiO2 and NH4H2PO4 can effectively reduce coal dust explosion pressure. The explosion suppression results adding NH4H2PO4 is better than that adding SiO2.

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