Advanced Materials Research Vol. 804

Abstract: In order to lay raw materials foundation for increasing the performance of insulating brick with the low grade quartz sand along the Yangtze River, the quartz porous ceramic materials was researched in this paper. The results show the porosity of the porous quartz ceramics decreased with an increase in the sintering temperature. The pore is like the bowl shape, and the pore is closed pore, which is help to improve the heat insulation property of quartz porous ceramics. The CaSiO₄ is produced in the ceramics after sintering processing. The shape is better, and the microstructure is circular and symmetrical pore, which is help to improve the mechanical property of quartz porous ceramics.

Abstract: The purpose of this study was to investigate the effect of polyanionsodium tripolyphosphate (STP) on color stability of the bleached enamel upon exposure to a staining agent-red wine. Thirty specimens were prepared and bleached with 35% hydrogen peroxide (HP). Then, they were divided into three groups and immersed in different experiment solutions, including distilled and deionized water (DDW, negative control), 2% STP (PH 9.0) and 1000 ppm NaF aq. (positive control), before and after red wine stain challenge, 3 times per day. The color of all specimens was measured before and after exposure to red wine with a spectrophotometer, and total color change (ΔE*) were calculated. The data were analyzed with a one-way ANOVA and the means were compared by Tukeys post hoc analysis (α=0.05). STP treatment group demonstrated significantly less color change than DDW and NaF groups (p<0.05). No significant difference was observed between DDW and NaF group. It can be concluded that the staining susceptibility of bleached enamel decreased after application of polyanion sodium tripolyphosphate.

Abstract: Anodic oxidation processing titanium foil in an aqueous solution of hydrofluoric acid+ glacial acetic acid+polyethylene glycol constant pressure, Synthesized by high-density ordered TiO₂ nanotube arrays. Calculate the degradation rate of chloramine phosphorus, TiO₂ nanotubes catalytic performance test.The use of scanning electron microscopy (SEM) and X-ray diffraction (XRD) to characterize the morphology and structure of the nanotubes, Visits oxidation time on the morphology and size of the nanotube arrays, mapping and analysis of current - time curve. An average particle diameter d of the sample may be calculated the strongest diffraction peak of the plane FWHM ,So chloramine phosphorus selection of organic phosphorus drugs for the photocatalytic degradation object, Molybdenum blue spectrophotometry measured and calculated degradation rate, Study of heat treatment temperature and anodizing time photocatalytic degradation, And the sol - gel prepared TiO2 thin film and photocatalytic comparative experiments.

Abstract: Various polymers have found application in ecological monitoring (as sensors of foreign matter in air). One of the most appreciated features of a great many of compounds of this class is an ability to change physical properties when being affected by a number of factors (e.g. resistance variation depending on application of certain substances). Properties of a polymeric material are determined not only by its composition, but by methods of polymerization, mutual arrangement of chain units and volume structure, as well, i.e. by its structure at the supramolecular level. We applied methods of quantum chemical calculation to determine the types of interaction between an ammonia molecule and a pyrrole pentamer.

Abstract: Different mass fraction of BiCl₃ was added into the PVDF film to increase the content of β-phase. XRD and SEM were used to analyze the crystalline phase and microstructure of the films. The results show that adding of BiCl₃ increases the content of β-phase in the films. The possible reason of the increment of β-phase is that the addition of BiCl₃ can make the free radicals of PVDF with electric charge return to their original position and consequently improve the degree of crystalline of β-phase. Dielectric and thermal properties were also analyzed. When mass fraction of BiCl₃ is 2%, the PVDF film has the highest degree of crystalline and best properties.

Abstract: In order to improve the organization, reduce the porosity, compact the structure and enhance the corrosion resistance of the coating, Zn-Al-Mg-RE coating system was prepared by high velocity arc spraying. The surface appears, phase composition and electrochemical properties of the coating were characterized by scanning electron microscope, X-ray radiation diffaction and electrochemical workstation. The results indicated that the coatings were compact. The coatings were mainly zinc and aluminum phase. In corrosion of immersion, the reaction resistance and coating resistance of coatings quickly become bigger, the surface of coatings become more compact, and the corrosion reaction is more difficult. Electrochemical tests showed that the coating had excellent corrosion resistance. The electrochemical protection and self-sealing effect of coatings can have long-term effects on anticorrosion.

Abstract: Purpose:in this study, the conditions of the preparation of NDV-N-2-HACC/CMC microspheres are optimized. Methods:Using entrapment efficiency, particle size, Zeta potential as the evaluating indicators, 3 main factors to influence the preparation for microspheres were optimized by orthogonal factorization method. Result:The optimal conditions were 1.0 mg/ml HACC, 1.2 mg/ml CMC, 1:3 (v/v) NDV/HACC, and 1200 r/min and 30 min for stirring. The range of particle size was 192.1-595.2 nm, and average size was 304.3 nm. Zeta potential was +32.50 mV; encapsulation efficiency (EE) was (98.96±2.1) %.Conclusion:the conditions of the preparation of NDV-N-2-HACC/CMC microspheres are optimized.

Abstract: Graphene is a fascinating new member of carbon materials with honeycomb and one-atom-thick structure, consisting of 2D hexagonal lattices of sp² carbon atoms covalently bonded. Graphene has a huge theory specific surface area (over 2600 m² g¹), good thermal conductivity, high values of Youngs modulus and fracture strength, high thermal stability and chemical stability and fast mobility of charge carriers, etc.. In recent years, many researchers found graphene have outstanding adsorption capacity of dyes in aqueous solution due to its high specific surface area. This paper summarized the graphene, graphene oxide and functionalized graphene removing various dyes in wastewater.

Abstract: Oleic acid was oxidized to azelaic acid by ozone and hydrogen peroxide as an oxidant jointly in this paper. The effect of major factors, such as the volume and concentration of hydrogen peroxide, the volume and concentration of ozone. The results show that the yield of azelaic acid was up to 71 %, when the oxidation was taken under the following condition: oleic acid 20g, phosphotungstic acid hydrate 0.6g , 30% hydrogen peroxide solution 60ml, reaction temperature 70°C, reaction time 8h.

Abstract: Poly (phenylene sulfide) (PPS) was blended with polyamide 66 (PA66) in a wide range of compositions by using a co-rotating twin-screw extruder. Scanning electron microscopy and solvent extraction were employed to detect phase morphology of PPS/PA66 composites. The results demonstrated that the phase morphology of PPS/PA66 composites changed from PA66 dispersed phase in PPS matrix to co-continuous phase, and then PPS dispersed phase in PA66 matrix with the increase of PA66 content.