Advanced Materials Research Vols. 512-515

Abstract: A complex of Eu(Ⅲ), HTTA and TPPO was synthesized in alcohol (HTTA= 2-Thenoyltrifluoroacetone and TPPO=Triphenyl phosphine oxide )and its corresponding single crystal was obtained. The complex was characterized by IR,UV, X-ray single crystal diffraction.The photoluminescent and electroluminescent properties of the complex were studied. The results showed that the spectra structure characterization is consistent with that of single-crystal diffraction. The complex exhibited ligand-sensitized red emission, and it has higher sensitized luminescent efficiency and good thermal stability.In device ITO/PVK/ Eu(TTA)3(TPPO)2/Al, Eu3+ may be excited by intramolecular energy transfer from ligand as observed by electroluminescence. The main emitting peak at 614 nm can be attributed to the europium of ⁵D₀→⁷F₂ of Eu ³⁺ ion and this process results in the enhancement of red emission from electroluminescence device. The present study may be important and helpful for the development of red color rare earth display applications.

Abstract: a fluorine functionalized 1,10-phenanthroline ligand, 3-ethyl-2-(2-fluorophenyl) imidazo[4,5-f]1,10-phenanthroline(EFPIP) and the corresponding red-emitting Eu(ΙΙΙ) complex Eu(DBM)₃(EFPIP) (DBM = dibenzoylmethanate) was synthesized and the photophysical properties and electroluminescent(EL) performances were researched. When Eu(DBM)₃(EFPIP) was used as emitting material in organic devices, the maximum efficiency and luminance of red emission achieved from the EL device with the configuration of ITO/m-MTDATA (30 nm)/NPB (20 nm)/ x wt% Eu(DBM)₃(EFPIP) doped in CBP (30 nm)/Bphen (20 nm)/Alq₃ (20 nm)/LiF (0.8 nm)/Al were 3.6 cd/A and 563 cd/m², respectively. Compared with the previously reported devices based on methyl or chlorine substitute Eu(ΙΙΙ) complexes, the EL performances of the device using Eu(DBM)₃(EFPIP) as an emitter was significantly enhanced due to the introduction of fluorine.

Abstract: A new well-aligned nanofibers structure of polypyrrole (WAPPy) has been successfully grown on glassy carbon electrode by using a simple, reliable, and template-free electrochemical technique. The unique structure and design not only reduces the diffusion resistance of electrolytes in the electrode material but also enhances its electrochemical performance. Electrochemical supercapacitors based on WAPPy achieved a specific capacitance of 365 F g^-1 with an applied charge/discharge current density of 1 A g^-1 over a potential window of -0.5 to 0.5 V. For comparison, the granules PPy particles have been also electrochemical synthesized by using KCl as electrolyte (PPy-Cl). The specific capacitance of PPy-Cl electrode is 120 F g^-1. The high specific capacitance and good stability of the WAPPy electrode has great potential in various applications such as energy storage.

Abstract: Abstract. With Investigating the Mechanism of Straw extrusion，test study on the influence of parameters of extrusion system on pressure of die through square combination experiment of five factors and five levels with orthogonal rotation by the single extruder, these parameters include the nozzle’s gap △, distance δ between screw end and internal surface of die, the temperature Τ of sleeve, the screw speed N and straw moisture W. The optimum values of parameters of extrusion system were put out which provides certain reference for extrusion design.

Abstract: The pyrolysis of Honghe lignite was investigated on low heating rate (about 20°C/min) conditions in a fixed bed reactor with 10g fed in. Nitrogen was used as carrier gas operating at the range from 50 to 200ml/min. And, the temperature was tested from 440 to 560°C, the pressure ranges from 0.1MPa to 1.2MPa. The yields of coal tar, char, water and gas were obtained in experiments. The maximum coal tar yield of 9.77% (dry coal) was achieved at 520°C, 50ml/min nitrogen flow rate, pressure 0.4MPa and 20 minutes holding time. Then methanol was injected in the system at the preheat temperature 240°C(a little higher than its critical temperature). The methanol flow rate, pressure and holding time were also taken into consideration. And the results were compared with those obtained in pyrolysis under nitrogen atmosphere. It showed that higher liquid yield with lower yields of char, gas and loss were obtained with the presence of methanol, but the differences of char yields were slight. The total sulfur removal for methanol presence is considerably higher than the absence of methanol in pyrolysis. Considering the mild conditions of the pyrolysis with presence of methanol, this method may be an appropriate way to make use of the lignite efficiently and environmentally.

Abstract: The pesent paper decribed the effects of additive on temperature rising characteristic during coal pyrolysis at different temperature in microwave field. Different mixture rate of carboncoal with coal and different final temperature on coal pyrolysis tempereature rising characteristics were studied in the work. The results indicate: Coal is a poorly microwave absorbing material, and its pyrolysis in microwave field need to add a certain amount of microwave absorbent for higher heating rate; Because carbocoal can be fast heated in microwave field, so it can be used as additive for coal pyrolysis. Carbocoal otained from different pyrolysis temperature have different heating rate, along with the increase of carbocoal pyrolysis temperature, carbocoal heating rate increases in microwave field. Using charcoal as microwave absorbent for coal rapid pyrolysis in microwave field is feasible.

Abstract: Dongsheng deposit at the northeast Ordos Basin is one of the largest sandstone-type uranium deposits in China. Its characteristics are quite different from that of sandstone-type uranium deposit in Turpan Basin and Yili Basin, Xinjiang province. One of the important aspects is that Zhiluo group of ore-bearing stratum in Dongsheng deposit was developed with more discontinuous lenticular carbonation and phenomenon of calcified wood rather than the unique non-plant fossils. This phenomenon of calcified-wood alike carbonation is rarely observed in other uranium deposits in Ordos Basin. The identified rock slice is composed of micritic calcite cemented sandstone and crystalline calcite. The former was formed by sedimentary diagenesis. The latter consists of calcite inclusions, which have been observed in water-based solution and CO₂ or CH₄-based gas inclusions. The temperature of the most inclusions were in the range of 140~170°C. It indicated that carbonate played an important role as hydrothermal fludis in the process of the formation of calcified wood. The analytic results of sparry calcite carbon and oxygen isotope showed that the most of the carbon sources were provided by the organic matter rather than from the process of diagenesis. Combined with the formation and characteristics of Dongsheng deposit where the area oil and gas dispersion exists, the formation of calcified-wood alike carbonation was the result of geological dispersion of oil and gas, which came from the middle of the basin area in the Paleozoic atmosphere filled by calcite crystals. Understanding the formation mechanism of Zhiluo group of ore-bearing stratum has great significance in prospecting for Dongsheng deposit.

Abstract: The rheological behavior of sub-micron zinc oxide and alumina mixture powders aqueous suspension has been investigated over a wide range of volumetric solids loading (Ø = 0.2–0.55), in which polyacrylic acid (PAA) was used as a dispersant. The dependence of relative viscosity (η_r)–solids loading (Ø) determined experimentally was compared with models. The experimental results showed that the suspension apparent viscosity (η) reached a minimum as the dispersant addition reached 0.2 wt%, the viscosity increased with the solids loading and the rheological behavior of the suspension was content basically with the model proposed by Liu. From η_r–Ø relationship the maximum solid loading (Ø_m) was estimated to be 0.55, which was in accord with our experimental results.

Abstract: High-efficiency WOLEDs based on phosphorescent dye bis[2-(4-tert-butylphenyl)benzothiazolato-N,C2′]iridium (acetylacetonate) [(t-bt)2 lr (acac)] as yellow emitting layer were fabricated. The turn-on voltage of the device was 3 V with a maximum luminance of 15,460 cd/m2 at 16.5 V and a maximum luminance efficiency of 7.5 lm/W at 4 V. The CIE coordinates located at (0.33, 0.32) and remained unchanged at over 8 V, almost consistent with optimum the white CIE of (0.33, 0.33). The effect of carrier trapping and energy transfer on the device performance was also discussed.

Abstract: Coal spontaneous combustion is a common coal mine disaster, the internal mechanism of coal combustion is revealed better by researched the relationship between the coal volatile and the kinetics parameters. Based on the method of non-isothermal, the coal samples from Jinggezhuang9#, Jinggezhuang11#, Qianjiaying, Tangshan and Tunlan are used the thermo-gravimetric experiment. The relationship between the reactive kinetic parameter and the volatile matter are fond out, when the heating rate is 100C/min. The experiment results illustrate that the more the volatile matter is, the less the activation energy (E) and the Pre Exponential factor (A) are, and the difficulty rank of coal samples of spontaneous combustion is Jinggezhuang9#, Jinggezhuang11#, Tangshan, Qianjiaying, Tunlan.