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Beijing, China

Zhao D.,Northwest University, China | Huang J.,Northwest University, China | Song J.-R.,The Palace Museum | Zhong Y.-T.,Northwest University, China | And 2 more authors.
Chemical Research in Chinese Universities | Year: 2012

N-(2,3-Dimethyl-phenyl)-N'-(methoxyl formyl)thiourea was synthesized by the reacting of 2,3-dimethylaniline, potassium thiocyanate(KSCN) and methyl chloroformate(ClCOOCH 3). Single crystal was obtained by slowly evaporation solvent at room temperature. The structure was characterized by elemental analysis, IR and X-ray crystalography. The compound crystallized: a triclinic system with space group Pi, a=0.83440(12) nm, b=0.89113(13) nm, c=0.93015(13) nm, a=76.548(2)o, ß=63.906(2)o, γ=82.538(2)o, V=0.60379(15) nm 3, Z=2, D c=1.311 mg/m 3, F(000)=252, μ=0.256 mm -1, R 1=0.0379, wR 2=0.0919. The specific heat capacity of the title compound was determined by a Micro-DSC method, and the specific heat capacity was 1.25 J.g -1.K -1 at 298.15 K. Thermodynamic functions, relative to those at the standard temperature of 298.15 K, were calculated via thermodynamic relationship. The thermal behavior of the title compound under a non-isothermal condition was studied by differential scanning calorimetry/ thermogravimetric(DSC/TG) method. There was an obvious endothermic peak in the DSC curve, the peak temperature was 479.43 K. The compound mass loss was 89.94% observed from the TG curve. Source


Duan H.,Key Scientific Research Base of Ancient Ceramics the Palace Museum | Ji D.,Key Scientific Research Base of Ancient Ceramics the Palace Museum | Ding Y.,Key Scientific Research Base of Ancient Ceramics the Palace Museum | Wang G.,The Palace Museum | And 3 more authors.
Microchemical Journal | Year: 2016

Longquan celadon is one of the most valuable treasures in Chinese ceramic history. Representative products are Ge ware (Ge meaning elder brother, black body celadon) and Di ware (Di meaning younger brother, gray body celadon) of the Song Dynasty (960-1279. A.D.). In this study, Ge and Di ware shards excavated from Wayaoyang kiln site in Longquan were collected and studied. Chemical and crystallite composition, microstructure, body and glaze thickness, firing temperature and glaze reflectance spectrum were observed and examined. Differences in raw materials and manufacturing technology between Ge and Di ware were studied. Based on the results and historical background, it was speculated that some Ge wares from Wayaoyang kiln site might be the test products of jade-like black body celadon for the imperial court. © 2015 Elsevier B.V. Source


Zhang X.,Northwest University, China | Huang J.,Northwest University, China | Song J.,The Palace Museum | Xu K.,Northwest University, China | Ban Q.,Northwest University, China
Chinese Journal of Chemistry | Year: 2010

4,4'-Bis(3-N-methoxyformyl thioureido)-diphenyloxide was prepared via reaction of 4,4'-diaminodiphenyl alter with potassium sulfocyanate and ethyl chloroacetate in ethyl acetate. The single crystal of the title compound was cultured by slow evaporation method at room temperature. The crystal structure was determined with X-ray diffractometer. It is a monoclinic crystal, space group C2/c with a=0.95911(19) nm, b=0.75922(15) nm, c=2.7161(5) nm, α=90°, β=97.675 (3)°, γ=90°, V=1.9601(7) nm3, Z=4, Dc=1.472 g·cm-3, F(000)=904, μ=0.311 cm-1, R1=0.0367, wR2=0.1408. The specific heat capacity of the title compound was determined with continuous Cp mode of mircocalorimeter. The thermal behavior of the title compound was studied under a non-isothermal condition by DSC method. © 2010 SIOC, CAS, Shanghai, & WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Liu W.,Tsinghua University | Yang X.,Changsha University of Science and Technology | Xie Z.,Tsinghua University | Jia C.,The Palace Museum | Wang L.,Tsinghua University
Journal of the European Ceramic Society | Year: 2012

In this work, we adopt a combination of low molecular weight PEG (L-PEG) and high molecular weight PEG (H-PEG) as water-soluble binder to fabricate injection-moulded ceramic parts with large section. The mechanism of the combination of PEGs removal was proposed for the first time. Defect-free near gear parts with large-sized-section (thickness - 16. mm) were successfully fabricated through water extraction (15. h) followed by rapid thermal pyrolysis (4.5. h). It solves the difficulty of fabricating injection-moulded ceramic parts with large section and our approach is energy saving and high-efficiency as compared with conventional thermal debinding. The results demonstrate that our approach of partially water-debinding followed by rapid thermal pyrolysis could solve the problems of conventional thermal debinding, providing an effective route for the production of injection moulded ceramic parts with large section. © 2012 Elsevier Ltd. Source


Chen M.,Northwest University, China | Song J.-R.,The Palace Museum | Ma H.-X.,Northwest University, China
Hanneng Cailiao/Chinese Journal of Energetic Materials | Year: 2016

The geometrical structures, front orbit energy and enthalpies of formation (ΔHf) of thirty kinds of 1, 2, 4, 5-tetrazine derivatives were studied by using DFT-wB97/6-31+G** method. On this basis, the detonation parameters of the derivatives were estimated by Kamlet-Jacobs equation. The bond dissociation energy of the title compounds was analyzed. The thermodynamic properties of part of the title compounds at different temperatures from 200 K to 800 K were calculated by statistical thermodynamics. The detonation performances and stability of 1, 2, 4, 5-tetrazine derivatives were compared. Results show that their ΔHf are between 920.46 and 2610.45 kJ·mol-1and the detonation velocities are between 7.69 and 9.31 km·s-1. -NO2 and -N=N-is not conducive to increase the stability of the derivatives. The values of standard molar heat capacity cp, standard molar entropy Sm and standard molar enthalpy Hm gradually increase with the temperature. i2 (3-(5-Nitro-1, 2, 3, 4-tetrazol)-6-nitro-1, 2, 4, 5-tetrazine), ii2 (3-(azo-5-nitro-1, 2, 3, 4-tetrazol)-6-nitro-1, 2, 4, 5-tetrazine) and iv2 (3, 6-azo-bis (5-nitro-1, 2, 3, 4-tetrazol)-1, 2, 4, 5-tetrazine) may be considered as potential candidates for energetic materials. © 2016, Editorial Board of Chinese Chinese Journal of Energetic Materials. All right reserved. Source

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