Advanced Materials Research Vol. 790

Abstract: Supported liquid membrane is established by using 2-Ethylhexylphosphoric acid mono-2-ethylhexyl ester as carrier, kerosene as membrane solvent and Polyvinylidene fluoride membrane as matrix. This article analyzes the effects of Cu (II) concentration, migration time, carrier concentration and feed solution pH for the rate of migration by means of monofactor experiments to obtain the optimum experimental conditions. The results indicate that the migration rate of Cu (II) with the optimical conditions as following: Cu (II) concentration at 4×10^-4mol/L, migration time at 120min, carrier concentration at 7% and feed solution pH at 5.0, attains to 83.5%, which is the optimum value of Cu (II) migration.

Abstract: Because of the coating binder migration in cross-section of coating layer, the binder concentration will be different in z-direction of coating layer, which affect some properties of coated paper. The Paper studied the effects of pigment type, coating color solid content and dying temperature on binder migration and affected factors. The z-direction distribution of the coating binder which was tagged with Br in coating layer and its concentration in coating surface were examined quantitatively by using SEM-EDXA and ESCA analysis. The mechanism of binder migration was also proposed. The results indicated that the degree of binder migration is directly proportional to the drying temperature, that the increase of the ratio of calcium carbonate in the pigment content, coating surface binder concentration increased. The result also indicated that the degree of binder migration was increased with reduced the coating solid content.

Abstract: The LiMg_0.06Mn_1.94O₄ calcined at 500 °C for 3 hours then sintered at 600 °C, 700 °C and 800 °C for 3 hours by flameless liquid-phase combustion synthesis are prepared. Particle properties were characterized by X-ray diffraction, scanning electron microscopy and Fourier transform infrared spectroscopy. Besides, galvanostatic tests and electrochemical impedance spectroscopy were performed to investigate the cycling performance. Particle properties analyses showed that LiMg_0.06Mn_1.94O₄ sintered at 600 °C has a single phase and the average grain size is about 80-200 nm with a little agglomeration, it also displays the highest initial capacity of 114.2 mAh/g and still remains 82.7% after 40 cycles. Results showed that sintered temperature by nitric acid assisted liquid-phase combustion method should be 600 °C.

Abstract: This paper presents an experimental study of fire suppression effectiveness with water mist containing FeCl₂ additives.The investigation focuses on suppression effectiveness under various FeCl₂ additives concentrations,working pressures and nozzle different height above the fire source . The experimental results show that: there is a significant impact on fire suppression effectiveness when adding FeCl₂ to water mist. There is an optimum additive concentration of extinguishing fire, corresponding to the shortest extinguishing time, the least amount of water, the highest efficiency of extinguishing fire. The nozzle working pressures and nozzle position have effect on the performance of the water mist extinguishing: the greater the pressure is, the shorter water mist fire extinguishing time is. Under the same experimental conditions, the closer the water mist nozzles are to the oil pan, the shorter extinguishing time is.

Abstract: The manganese^II complex [Mn (C₉H₉O₃)₂(H₂O)₂], the Mn^II atom is located on a twofold axis and is coordinated by two ethylvanillinate anions and two water molecule in a distorted octahedral geometry. The ethylvanillinate ligand chelates to the Mn^II atom through its ethyl and hydroxyl O atoms, with greatly differing Mn-O bond distances (2.3988(15)Å and 2.0675(13)Å).Adjacent complex link to each other via hydrogen bonds forming the three-dimensional supramolecular structure.

Abstract: An equation of state (EOS) model of detonation products based on chemical equilibrium is developed. The EOS of gaseous detonation products is described by Rosss modification of hard-sphere variation theory and the improved one-fluid van der Waals mixture model. The condensed phases of carbon are taken as a mixture of graphite, diamond, graphite-like liquid and diamond-like liquid. For a mixed system of detonation products, the free energy minimization principle is used to determine the equilibrium compositions of detonation products by solving chemical equilibrium equations. The potential function parameters have been renewed and the non-ideal fixing effects of the major detonation products have been taken into account. The calculated detonation parameters in our work for a variety of explosives are well in agreement with the experimental data.

Abstract: Dynamic fracture of ductile metals at different strain rates and temperatures is studied via molecular dynamic simulations. The results show that both increase of temperature and decrease of strain rate reduce the yield strength, but the stress-strain curves separate prior to yield point at different temperatures. Both increase of temperature and strain rate shorten the duration of the stage of dislocation nucleation and slip. The stress-strain curves for various materials indicate that void nucleation needs not only lower yield strength but also lower fault energy. After the yield point, initially some defect clusters form along the loading direction. With the increasing of strain, small dislocation loops nucleate from some larger defect clusters, then quickly multiply and move on slip plane. When the stress exceeds a critical value, some voids nucleate in dislocation aggregation regions. The incipient void shapes are clavate and void distributions predominantly are along the perpendicular directions of tensile loading. Nucleated voids gradually grow into spherical-like shapes via emitting dislocations.

Abstract: The grain oriented silicon steel containing 3%Si-0.5%Cu was produced by low slab reheating temperature technique. The precipitates were observed during the mainly process such as hot rolling, normalization, primary and secondary recrystallization annealing. The species, size, density and shape of precipitates were identified using TEM technique. The results indicate that Cu₂S and AlN are mainly inhibitors which precipitate during hot rolling and normalization respectively. After primary recrystallization annealing the precipitation size of Cu₂S is in the range of 30~40nm while the mean size of AlN is ~50nm, which could inhibit grain growth. In addition, the precipitation of MnS is inhibited comparing with the precipitation of Cu₂S.

Abstract: E-waste contamination is of major environmental concern on a world scale, with the rapid development of electric industry. The recycling and disposal methods of e-wastes remain rudimentary, and pose a serious environmental threat and have adverse influences on human health, because toxic pollutants such as polychlorinated biphenyls (PCBs), and heavy metals are released into the environment during crude recycling. nanophytoremediation is a combined technology between nanotechnology and phytotechnology for remediation of contaminated environments. This work was aimed to investigate the tolerance and accumulation characteristics of e-waste pollution, as well as the effect of nanoscale zero valent iron (nZVI) on their phytoremediation capacity. Results showed that nZVI could facilitate the growth of plants both under clean soil and the high pollution, with increased by 30.3% and 53.5% respectively. This may be attributed to the improvement of soil quality and adjustment of soil pH by nZVI. Especially, all the nZVI adding treatments had significantly higher PCBs accumulation efficiency compared with that without addition of nZVI, thus indicating nZVI-phytroremediation would be a very promising method in the future.

Abstract: The effects of ultrasonic on the reactive dyes wastewater removal during magnesium hydroxide coagulation process were studied. The relationship between Flocculation Index (FI) and removal of chrominance was discussed with controlled experiments using on-line intelligent Particle Dispersion Analyzer (iPDA). The results showed that: Coagulation performance was better when increasing the ultrasonic intensity to 80W with the coagulation dose 144 mg/L and the solutions pH 12.0. The removal efficiency of reactive dyes was higher obviously with ultrasonic time 15s and 25s for dyes X-3B and X-R, respectively. The changes of zeta potential were also measured in coagulation process.