Advanced Materials Research Vols. 560-561

Abstract: Considering the crystal field parameter D_q and average covalent factor N, the energy levels of NaMg₃Al(MoO₄)₅: Cr³⁺ crystal at 295 K are calculated by diagonalizing the energy matrix of 3d³. At low temperature 9 K the bond length of Mg-O is calculated by adjusting the value to fit the spectra of Mg site. The value of Mg-O bond length is 2.0528 Å. The equation relationship of Mg-O between bond length and temperature is achieved.The calculated values are consistent with the experimental spectra.

Abstract: In order to guide atmosphere annealing process in industry, the effect of atmosphere and holding times on the surface quality and mechanical properties of the cold-rolling plate of Fe-42% Ni (4J42) was studied. It is found that in the laboratory, surface qualities of all the samples annealed at different annealing condition are all good enough. When the ratio of hydrogen and nitrogen is below 70%:30%, at different holding time, with increasing of H₂ proportion, 4J42’s tensile strength and yield strength all increases, and the hardness declines. And except H₂:N₂=70%:30, when holding time is less than or equal to 1.2min, at different ratio of hydrogen and nitrogen, holding time will influence 4J42’s mechanical properties little. So combine requires in industry with the experiment results, it can be concluded that for 4J42 alloy, annealing at atmosphere of hydrogen nitrogen ratio is less than 70%:30% for about 1.2min is appropriate to atmosphere annealing process in industry.

Abstract: The oil-shale-dreg is the wastes after refining the oil shale to obtain the shale oil. But in the oil-shale-dreg, there are the massive mineral component, like the quartz, the feldspar, the clay ingredient and so on. After calcined, its structure becomes loose, owning the very low density and much ignition loss. In our study, we use different rate of oil-shale-dreg, bauxite and flux for granulation by using disk granulator. After high temperature we get low density Petroleum Proppant. The proppants have the high strength and the high flow conductivity. That is satisfied the national standards by adding 30% wt solid waste oil-shale-dregs residue to the bauxite.

Abstract: Nowadays, polyether silicone oil is widely used in many aspects of chemical industry. In this paper, the synthesis of polyether modified polysiloxane was studied and its technology was the best choice. This paper discussed the synthesis of polyether modified polysiloxane materials during the synthesis ratio, catalyst amount, reaction time and temperature on the synthesis of polyether polysiloxane low conversion rate of hydrogen silicone oil. The results showed that synthesis of polyether modified polysiloxane of the best technology: the C=C of allyl alcohol and the Si-H in low-hydrogen silicone polyether feed ratio was 1:1.2, the catalyst material is 33 μg / g, the reaction temperature is 110 °C, reaction time to 8 h.

Abstract: Effects of white-rot fungus BYBF treatment on properties of papermaking wastewater were investigated. The optimal immobilized conditions were the PVA 5%, SA 2.3%, active carbon 2%, 2% CaCl2 in saturated boric acid solution and pH = 7. Using these materials to form immobilized beads, which have great mechanical strength and big specific surfaces. Using these beads to immobilized BYBF to treating terminal wastewater. COD decreased from 411mg /l to 352mg/l in 4 days.

Abstract: The component and contents of scale sample on the graphite heat exchanger were analyzed by ED-XRF( Energy dispersive X-ray fluorescence spectrometer) and the component and contents of spent acid unconcentrated and concentrated were measured by AAS(atomic absorption spectrometer).In addition, the phase structure of scale sample was tested by XRD(X-ray diffraction) and the simulation experiment of spent acid concentrating was carried out to study the scaling mechanism in the laboratory. The results show that the main components of scale were Ca, Ti and Fe. The scaling might be induced by settlement of Ti oxide, and then Ca and Fe precipitate rapidly.

Abstract: The process of kraft pulping of Fast-growing Poplar was studied,by determining the lignin contents including Klason lignin and acid soluble lignin, the yield of pulping, the rate of carbohydtare degradation and delignification rate. Results indicated that the delignificaton of Fast-growing Poplar in kraft pulping can be divided into three distinguishable stages. (a)The initial delignification stage before 140°C,the rate of delignification reaches to 35.76%; (b)The bulk delignification stage, the rate of delignification reaches to 90.50%，in the period from 140°C to 170°C and for 30 min; (c)The residual delignification stage,the rate of delignification exceeds 95.56%. The defibration point was reached when cooking temperature raised to 170°C and for 30 min with 52.22% pulping yield ,17.83 kappa number.

Abstract: CdSe nanocrystals were prepared within a template of mesoporous silica (MS) spheres via chemical reaction. The photocurrent of CdSe/MS composite under UV illumination was distinctly higher than that in the dark. The horseradish peroxidase (HRP) was immobilized on the surface of the composite particles. The HRP/CdSe/MS composite film toward the reduction of hydrogen peroxide (H2O2) had stronger response signal under UV illumination than that in the dark. The electrons photo-generated from CdSe and the electrons provided by electrode can occur simultaneously to catalyze the reduction of H2O2. The holes photo-generated by CdSe are trapped at the interface between CdSe and pore walls of MS film. The results show that CdSe/MS composite film has good photoelectric properties and potential application on immobilization of horseradish peroxidase for hydrogen peroxide monitoring.

Abstract: The use of Pb-free solder alloys are just newly developed materials and their properties are not well established and documented yet. So, the research to substitute the critical problem of the Pb solder alloy are increasing widely. To evaluate the shear property of solder joints according to temperature condition was predicted through the Shear-Punch test and FEM. By using the database according to this, the reliability evaluation technology of the solder joints tries to be formulated. In this paper, the solder used the Sn37Pb, Sn-4Ag and the Sn4Ag0.5Cu. When solder melted in the copper interface, the solder joints according to reflow times, each modeling required for the Shear- Punch was made in consideration of the IMC layer thickness. And the micro shear punch test was performed to obtain material properties of solder according to temperature condition. The shear properties of specimen which was modeled was predicted through FEM. It compared with the test value in which it obtains from Shear-Punch. Also, a method which can obtain shear properties of Pb-free solder joints easily and quickly using FEM was proposed.

Abstract: Electrospinning combined with nonsolvent-induced phase separation is a simple and novel method to produce porous nanofibers. In the study, Poly (vinylpyrrolidone) (PVP) nanofibers were fabricated using an electrospinning approach complemented by compressed nitrogen (N). N2 was used as the nonsolvent of choice. Besides, the tun₂ning of N₂ pressure and temperature can impact the nanofibers’ morphologies by altering phase behavior and mass transfer. Also, the other parameters affecting electrospinning of polymer solution were discussed. The results were demonstrated by extending the technique to PVP/dichloromethane (DCM) and PVP/ethanol (EtOH) systems. And the binary phase equilibrium of solvents (dichloromethane or ethanol) and N simulated by ASPEN PLUS 2006 demonstrates that N is not a ₂good choice for producing hollow or po₂rous polymer nanofibers.