Advanced Materials Research Vol. 531

Abstract: Lead selenide has been the subject of considerable interest because of its potential applications in many fields. In this paper, the synthesis of lead selenide nanostructures is described. The Morphologies of as prepared lead selenide nanostructures are summarized. And the applications and prospects of lead selenide in this field also are analyzed.

Abstract: The anodic polarization curves of 430 ferrite stainless steels with various RE contents in 3.5% NaCl neutral solutions have been measured by electrochemical methods. The effect of RE on pitting corrosion resistance of 430 ferrite stainless steels has been studied by the metallographic examination. The results show that sulfide and other irregular inclusions are modified to round or oval-shaped RE2O2S and RES after adding RE to 430 ferrite stainless steesl. RE makes sulfide, and other irregular inclusions change to dispersed round or oval-shaped RE inclusions, effectively inhibits the occurrence of pitting corrosion, thereby enhancing the corrosion resistance of 430 ferrite stainless steels.

Abstract: The corrosion behaviors of pure copper were studied in initial exposure to a simulated marine atmosphere. A two-electrode cell system with two identical pure copper plates had been employed in electrochemical tests of potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The copper electrodes were deposited with 70 µg cm^-2 NaCl particles and then exposed in a humidified pure air of 97% RH at 25 °C. The time-evolution of corrosion current density obtained from the cathodic polarization curves had a trend of firstly decreasing, then increasing and finally getting a relative stable stage. The EIS data showed that the transition of two time constants corrosion stage to three time constants corrosion stage. The initial atmospheric corrosion behaviors of pure copper could be divided into three stages, including rapid corrosion stage, diminished corrosion stage and balanced corrosion stage.

Abstract: Electron beam injection(EBI) is a process of gathering the electrons in materials using electron beam(EB). The EBI technology is proposed for purification of silicon particles by removing metal impurities through high-temperature oxidation, EBI, and HF acid washing processes. Analysis of silicon particle morphology after high-temperature oxidation using digital camera and after EBI using scanning electron microscope(SEM) were conducted. Then, the composition of silicon particles was analyzed using inductively coupled plasma(ICP). The silicon particle colours turned bright after EBI; therefore, EBI can change the thickness of SiO2 films in addition to increasing the temperature of the silicon particles. The results show that this technology is effective in removing metal impurities in silicon particles.

Abstract: The composite materials were prepared with high-viscosity clay as carrier, activated carbon as adsorbent, and titanium dioxide as photocatalyst.Kinetic process of photocatalytic degradation of rhodamine B was investigated at different reaction conditions using the composite materials.The results shown that : rhodamine B was the maximum catalytic activity when the initial reaction solution concentration is 5mg/L,pH=6,and composite material dosing quantity is 5g/L.The kinetics of photocatalytic degradation reaction can be expressed by the first-order reaction kinetic model.

Abstract: Cadmium selenide has been the subject of considerable interest because of its potential applications in many fields. In this paper, the synthesis of cadmium selenide nanostructures is described. The Morphologies of as prepared cadmium selenide nanostructures are summarized. And the applications and prospects of Cadmium selenide in this field also are analyzed.

Abstract: Solar cell is one of most important renewable energy. But now it is not be widely used because of its high cost compared with traditional resource. Ribbon silicon is one new low cost solar cell material avoiding ingot casting and slicing. It is a promising silicon wafer fabrication technology alternative to traditional ingot casting and slicing. Using ribbon silicon can make solar cell production cost greatly reduced. In this paper EFG, String Ribbon and a novel silicon wafer are discussed.

Abstract: GeMn magnetic quantum dots (QDs) material were grown with a GeH4/Ar mixed gas under a constant flowing at 400°C by means of plasma enhanced chemical vapor deposition (PECVD) process, then doped with Mn doped using magnetic sputtering technique and annealed at 600 C. The QDs with a Ge0.88Mn0.12 structure derived from the energy spectrum show a wide opening hysteresis loops with a large remnant magnetizations Mr are 0.1410-4 and 0.2510-4 emu/g for the as grown and the annealed samples. Moreover, the magnetic QDs show high quality voltage-current (I-V) and voltage-capacitance (C-V) properties. The magnetic GeMn QDs can be used to fabrication electromagnetic devices.

Abstract: As fast development of semiconductor industry，equipment using PLC as main control unit has been widely used. Wafer chemical etching machine based on PLC control technology has some unreasonable design, causing the low process efficiency. After electronic control system upgrade, UPH is to increase 220%, water consumption is to decrease 39% and power consumption is to decrease 69%.

Abstract: Novel four-arm star-shaped (STEO) plasticizer was synthesized and characterized by FT-IR and NMR methods. The mixtures of STEO and ethylene carbonate (EC) were used as plasticizers in polyethylene oxide (PEO)-based polymer electrolytes. The effects of plasticizers on the thermal properties and the ionic conductivities of polymer electrolytes were reported. Results showed that the addition of plasticizers could effectively decrease the melting temperatures and the degree of crystallization of polymer electrolytes, and the ionic conductivities increased with the addition of plasticizers. When the mass ratio of STEO and EC was 1:1, mixed plasticizer had the best plastifying effect on the gel polymer electrolytes.