Shaanxi Applied Physics Chemistry Research Institute

Xian, China

Shaanxi Applied Physics Chemistry Research Institute

Xian, China
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Li L.,Northwestern Polytechnical University | Guo W.-G.,Northwestern Polytechnical University | Yu X.,Northwestern Polytechnical University | Fu D.-X.,Shaanxi Applied Physics Chemistry Research Institute
Ceramics International | Year: 2017

This paper studies the mechanical behavior of Alumina ceramic-Kovar joint under quasi-static and dynamic four-point bending (FPB). The joint is fabricated by molybdenum-manganese (Mo-Mn) metallization method with extra additions. The bend strength of the joint is improved by glass phase migration. Electronic universal testing machine and modified split Hopkinson pressure bar (SHPB) are employed to realize the loading process. The microstructure of the joint is investigated by scanning electron microscope (SEM) and the chemical composition is determined by energy dispersive spectrometer (EDS). Digital image correlation (DIC) technique is used to determine the displacement contours and ultra-high speed camera is used to monitor the deformation and crack evolution around the joint. It is found that the specimen will slip due to the different Young's modulus of base material. The dynamic bend strength of the joint is lower than the quasi-static bend strength. The failure mechanism of the ceramic-metal joint is mainly intergranular failure for the dynamic bend but mixed transgranular/intergranular failure for the quasi-static case. The crack starts from the inherent voids inside the ceramic and then expands along the metallization band between solder and ceramic. © 2017 Elsevier Ltd and Techna Group S.r.l.

Ren Q.,Xidian University | Luo Q.,PLA Second Artillery Engineering University | Hou Y.,Shaanxi Applied Physics Chemistry Research Institute
Advanced Materials Research | Year: 2012

The optical properties of the Mg(OH) 2 crystalline powder samples, which were prepared by us, were investigated by first-principles method. The calculated results show that the static state dielectric function ε 1(0) for Mg(OH) 2 is 2.8673. The peak value range for the Mg(OH) 2 absorption coefficient is mainly in the energy range from 45.521 eV to 66.0213 eV. Moreover, absorption coefficient researches its maximum, which is 1490460cm -1, at the energy of 63.7988eV. Besides, when energy is greater than 66.3901eV, the reflectivity rate is one. And the average static state refractive rate n(0) for Mg(OH) 2 is 1.6292. While the maximum peak of energy loss function for Mg(OH) 2 is in 20.4755eV.

Li J.,Xi'an Jiaotong University | Li J.,Shaanxi Applied Physics Chemistry Research Institute | Xu Y.,Xi'an Jiaotong University | Li X.,Tianjin Normal University | Zhang Z.,Xi'an Jiaotong University
Applied Surface Science | Year: 2013

Li2MnO3 stabilized LiNi1/3Co 1/3Mn1/3O2 cathode materials are discussed by xLi2MnO3·(1 - x)LiNi1/3Co 1/3Mn1/3O2 (x = 0.3 and 0.7) solid solutions. The solid solutions were synthesized by annealing the mixing LiNO3, Mn(NO3)2 and LiNi1/3Co1/3Mn 1/3O2 powder at 900 C for 12 h, and it was found that the cathode particle size increased from 200-300 to 300-500 nm. The pristine LiNi1/3Co1/3Mn1/3O2 showed the 30th discharge capacity of 174.5 mAh g-1. Our results indicated that the introduction of Li2MnO3 in the cathode could increase performance. 0.3Li2MnO3·0.7LiNi 1/3Co1/3Mn1/3O2 cathode shows higher discharge of 182.0 mAh g-1 in the 30th cycle. And the discharge capacity of 214.1 mAh g-1 was obtained when the Li 2MnO3 content increased to 0.7. Moreover, the cyclic performance at 55 C was also increased by Li2MnO3. For instance, the discharge capacities were 191.2 mAh g-1 (x = 0.3) and 229.3 mAh g-1 (x = 0.7) and the capacity retentions are 94.9% and 91.4% after 40 cycles, respectively. The DFT calculations show that stable Li2MnO3-enriched layer is as a result of enhanced performance. © 2013 Elsevier B.V. All rights reserved.

Wang Y.,Northwestern Polytechnical University | Kou K.,Northwestern Polytechnical University | Zhao W.,Shaanxi Applied Physics Chemistry Research Institute | Wu G.,Northwestern Polytechnical University | And 2 more authors.
RSC Advances | Year: 2015

Functionalized benzoxazine with allyl groups has recently attracted a great deal of attention due to its polymerizable group. In order to improve the properties of 4,4′-bismaleimidodiphenyl methane (BMI)/cyanate ester (BADCy), benzoxazine (Boz) was added into the BMI/BADCy system in this paper. The effect of functionalized Boz with allyl groups on the dielectric, mechanical and thermal properties of BMI/BADCy composites was systematically investigated in detail using mechanical measurements, scanning electron microscopy (SEM), dynamic mechanical analysis (DMA) and thermo-gravimetric analysis (TGA). The results showed that the formation of Mannich bridge networks and an interpenetrating polymer network through the polymerization of Bz-allyl and BMI/BADCy increased the cross-linking densities and thermal stability. Allyl-based polymers also exhibited high glass transition temperatures, and higher char yields. The dielectric constant value and the dielectric loss factor of BBz2 reached minimum values of 3.17 and 0.083 at 106 Hz respectively. The mechanical properties (a high flexural modulus of 4.18 GPa and flexural strength of 120 MPa) of BBz2 were superior. Scanning electron microscopy analysis showed a distinct characteristic of ductile fractures for the blends. © The Royal Society of Chemistry 2015.

Li H.,Yulin University | Zhao B.,Northwest University, China | Bai W.,Shaanxi Applied Physics Chemistry Research Institute | Zhang X.,Northwest University, China
Advanced Materials Research | Year: 2013

This study has investigated the degradation of H-acid (1-amino-8-naphthol-3, 6-disulfonic acid) containing water by catalytic wet hydrogen peroxide oxidation method, in which the catalyst of Fe/SiO2 was prepared by impregnation technology. The effect of catalyst dosage, initial pH value, amount of hydrogen peroxide and reaction temperature on the degradation process have been discussed, and the results indicated that wet hydrogen peroxide oxidation is an effective method for treating the wastewater containing H-acid, under the conditions that: catalyst dosage was 2 g, initial pH value was 7, amount of hydrogen peroxide was 10 mL (0.83 time of theoretical required amount) and reaction temperature was 80 °C, the COD and color removal rate can reach 87.3% and 96.5%, respectively. © (2013) Trans Tech Publications, Switzerland.

Zhang F.,Shaanxi Applied Physics Chemistry Research Institute | Wang Y.-L.,Shaanxi Applied Physics Chemistry Research Institute | Fu D.-X.,Shaanxi Applied Physics Chemistry Research Institute | Li L.-M.,Shaanxi Applied Physics Chemistry Research Institute | Yin G.-F.,Shaanxi Applied Physics Chemistry Research Institute
Propellants, Explosives, Pyrotechnics | Year: 2013

In this paper, the in-situ preparation and characterization of a porous copper-sodium perchlorate energetic nano-composite (PCu/NaClO4) and its electrical ignition properties are presented. Porous copper was in-situ produced by electro-deposition on a Ni/Cr alloy wire, which acts as a cathode during the electro-deposition. The PCu/NaClO4 nano-composite was produced by dipping the bridge with porous copper into a saturated sodium perchlorate acetone solution. SEM, EDS, and XRD were used to characterize the composite and DSC was used to study the thermal decomposition of the composite. The copper grain size was reduced by using additives such as CTAB in the electrolyte. The PCu/NaClO4 nano-composite on the bridge can be ignited by feeding a current through the bridge and the ignition delay time and electrical ignition sensitivity were measured. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Yin D.,Northwestern Polytechnical University | Liu H.,Shaanxi Applied Physics Chemistry Research Institute | Ma L.,Northwestern Polytechnical University | Zhang Q.,Northwestern Polytechnical University
Polymers for Advanced Technologies | Year: 2015

Microencapsulated phase change materials (MePCMs) using melamine-formaldehyde resin/SiO2 as shell were investigated in this paper. Organically modified SiO2 particles were employed to stabilize Pickering emulsion, and in situ polymerization of melamine and formaldehyde was carried out to form hybrid shell. The performances of resultant MePCMs with hybrid shell were investigated comparatively with the MePCMs with polymer shell. SiO2 particles raise the microencapsulation efficiency by improving the stability of emulsion and providing a precipitation site for melamine-formaldehyde resin. Also, the mechanical strength, thermal reliability, and anti-osmosis performance of MePCMs were improved significantly by SiO2 particles in the shell. Our study shows that Pickering emulsion is a simple and robust template for MePCMs with polymer-inorganic hybrid shell. © 2015 John Wiley & Sons, Ltd.

Zhang F.,Shaanxi Applied Physics Chemistry Research Institute | Wang Y.,Shaanxi Applied Physics Chemistry Research Institute | Bai Y.,Shaanxi Applied Physics Chemistry Research Institute | Zhang R.,Shaanxi Applied Physics Chemistry Research Institute
Materials Letters | Year: 2012

In this paper, preparation and characterization of a copper azide nanowire array were performed. Cu nanowire arrays were previously fabricated within the pores of porous anodic aluminum oxide (AAO) template by a direct voltage electrodeposition method at room temperature. Then the AAO template was dissolved in a 1 M NaOH solution for 30 min and carefully rinsed with deionized water. The available Cu nanowires were then in-situ reacted with HN 3, which was produced by heating stearic acid and NaN 3, for 10-20 h and Cu nanowires were transformed into copper azide, maintaining an ordered and oriented nanostructure. The copper azide nanostructure was characterized by SEM and XRD, and DSC was used to study the thermal decomposition of the copper azide. © 2012 Elsevier B.V.

Li P.,Northwestern Polytechnical University | Yang R.,Northwestern Polytechnical University | Zheng Y.,Northwestern Polytechnical University | Qu P.,Shaanxi Applied Physics Chemistry Research Institute | Chen L.,Northwestern Polytechnical University
Carbon | Year: 2015

A series of specific solvent-free nanofluids with ionically tethered polyether amine terminated polymers were successfully prepared and evaluated based on multiwalled carbon nanotubes (MWCNTs). The newly synthesized sorbents exhibited enhanced carbon dioxide (CO2) capture capacities compared to their corresponding polyether amine and pristine MWCNTs. The effects of polyether amine canopy structure such as amine types, Molecular weight (Mw), Ethylene Oxide/Propylene Oxide (EO/PO), viscosity and melting point on CO2 capture capacities were investigated. It had been demonstrated that the sorbents impregnated with more unprotonated amine groups and higher Mw or EO/PO showed larger CO2 capture capacities and good stabilities over multiple adsorption-desorption cycles. Last but not least, we also demonstrated that the lower melting point and viscosity were beneficial for the CO2 uptake. © 2015 Elsevier Ltd.

Liu J.,Northwestern Polytechnical University | Yin D.,Northwestern Polytechnical University | Zhang S.,Northwestern Polytechnical University | Liu H.,Shaanxi Applied Physics Chemistry Research Institute | Zhang Q.,Northwestern Polytechnical University
Colloids and Surfaces A: Physicochemical and Engineering Aspects | Year: 2015

Core-shell polymeric microspheres of tens microns in size with perfect spherical virus-like surface morphology were prepared through Pickering emulsion polymerization. Pickering stabilizer, monodisperse Poly(Glycidyl methacrylate) (PGMA) microsphere were obtained by two-stage dispersion polymerization and acid catalyzed hydrolysis was employed to transform the epoxy groups into glycol groups, rendering the P(GMA) microspheres moderately hydrophilic to stabilize Pickering emulsion. The P(GMA) microspheres and core-shell microspheres were characterized by scanning electronic microscope(SEM), Fourier transform infrared spectroscopy (FTIR), dynamic light scattering(DLS). The results show that monodisperse P(GMA) microspheres were arrayed in a compact hexagonal arrangement on the surface of core-shell microspheres, forming a perfect spherical virus-like surface morphology. © 2014 Elsevier B.V.

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