Advanced Materials Research Vols. 690-693

Abstract: Wasted wool fibers were dissolved by reductive method. The dissolved wool protein was extracted by the membrane technology and blended with the Polyacrylonitrile (PAN) polymer to prepare regenerated fiber. Effects of pH value and dissolution assisting agent type on dissolution percentage of the wasted wool fibers in sodium pyrosulfite reductive system were investigated. Effects of the drawing times on properties of the fibers were also studied. Results indicated that the dissolution percentage rose with the increase of pH value of the reductive solution. Metallic salts have better dissolution assisting effect than urea. Breakage percentage of the as-spun fiber and tenacity of the regenerated protein fiber rose with the increase of the drawing times.

Abstract: To obtain optimal medical ceramic film with bioactivity, Microarc oxidized TiO2-based films containing Ca and P on titanium alloy were formed in electrolytes containing hydroxyapatite and β-tricalcium phosphate salts. After that the biocompatibility tests including invitro soaking test and invivo implant experiment were carried out, and component and phases of films were analysed by energy dispersive spectrometer and X-ray diffraction, respectively.The obtained result shows the porosity biomedical ceramic films with different proportional of Hydroxyapatite/β-tricalcium are fabricated through changing the electrolyte composions,respectively.The bioactivity of biphasic calcium phosphate is enhanced comparing to the pure HA ones.So the biphasic calcium phosphate film material can be satified with medical application.

Abstract: Fire characteristics of wood dusts serve for qualitative comparison of combustibility and explosibility, for suggesting precautionary measures, for predicting consequences of fires and explosions. Setting of given characteristics by calculation is not possible yet. Therefore the most reliable results are set by experiment. The article deals with the testing of the minimum ignition temperature depending on the different types of dust layer and different heights of surface.

Abstract: Alkylethoxyethanesulfonate is one kind of nonionic-anionic surfactant with a polyglycol ether chain and a sulfonic group at the end of the chain. It was synthesized in a new method by using fatty alcohol-polyoxyethylene ether MOA-3, thionyl chloride and sodium isethionate as raw materials, and then the intermediate chloridepolyglycol ether MOACl-3 reacted with sodium isethionate in a superbasic system KOH-DMSO.The structures of MOA-3,MOACl-3 and alkylethoxyethanesulfonate MOASO-3 were confirmed by their IR spectrums, and the saltresistance of MOASO-3 was studied. IR analysis results indicate the intermediate and product all have the same structure with the aim compound. The saltresistance results show that MOASO-3 is compatible with NaCl aqueous solutions, when the concentration of MOASO-3 is 0.2wt%, the surfactant-water solutions were clear and transparent up 0.6wt% NaCl.

Abstract: The lignin condensated sulfonated naphthalene (abbreviated as LCSN) was prepared by condensation reaction. The electrical conductivity and the weight molecular of LCSN were determined by electrical conductivity meter, and Ubbelohde viscosimeter, and Critical Micelle Concentration (abbreviated as CMC) and HLB of the modified lignin were calculated. LCSN was characterized and verified by Fourier and scanning electron microscope, transform infrared spectroscopy (abbreviated as FTIR). SEM images revealed morphology of modified lignin. Under the same dosage, compared with raw material, concentration of lignite CWS used LCSN as an additive increased by 4.1%, which reached the same concentration of CWS as Naphthalene dispersants.

Abstract: Four different synthetic methods for preparation of aromatic sialnes have been developed and the hydrosilylation route has been proved to be one as the most commercially significant. A series of specialty aryl silanes have been synthesized for the potential applications of high performance and high temperature as silane coupling agents. The thermal stabilities of the bridged aromatic silanes have been examined using thermal gravimetric analysis (TGA) and compared against the gamma-substituted alkylsilanes and phenyltrimethoxysilane. These materials have greater thermal stability than the gamma-substituted, but marginally lower than phenyltrimethoxysilane.

Abstract: The aim of this study was to investigate the PAHs removal efficiency in coking plant contaminated soil when disposed by different oxidants with different dosages (hydrogen peroxide, Fenton’s reagent, modified Fenton’s reagent, potassium permanganate, activated sodium persulfate) and the PAHs distribution characteristics in removing parts, soil residue parts, recycling parts and supernate after oxidation reactions. Analyzed the variation characteristics of soil properties (pH and soil temperature) when used different oxidants in oxidation reactions process, screened out the effective and safe remediation oxidants. The research results indicated that the potassium permanganate has the best remediation ability and undemanding reaction conditions than other oxidants. The contaminant which be volatilized into surrounding environment was rarely when disposed by potassium permanganate in remediation process. Consequently, selecting potassium permanganate as remediation oxidant to treat PAHs in coking plant contaminated soils was the best choice.

Abstract: A new type of operation mode of cascaded columns of total reflux batch distillation with periodic liquid exchange was proposed. The feasibility of the new operation, which is suitable for separations of mixtures of close boiling point, thermo-sensitive material and isotopes, was proved by the experiments in which two columns and three columns in periodic liquid exchange were used with ethanol-isopropanol, ethylbenzene- paraxylene as the experimental mixtures. The results indicate that the new operation mode can generate summation effect of theoretical plates by periodic liquid exchange between columns, while the total pressure drop is the same as that of a single column.

Abstract: Pt/CeO₂/multi-walled carbon nanotubes (Pt/CeO₂/MWCNTs) catalysts have been synthesized by microwave-assisted polyol process at different microwave power values. The obtained samples have been characterized by physical examinations and electrochemical measurements. The effects of different microwave power on performance of Pt/CeO₂/MWCNTs have been mainly investigated. The results of physical examinations show that Pt nanoparticles have a narrow size and Pt nanoparticles and CeO2 units are highly dispersed on the surface of MWCNTs. The results of electrochemical measurements present that Pt/CeO2/MWCNTs catalysts by microwave-assis_{Subscript text}ted polyol process have higher catalytic activity and stability than Pt/MWCNTs catalyst by the same procedure. When the value of microwave power is 70%, the Pt/CeO₂/MWCNTs catalyst has the smallest particle size and exhibits the highest activity and stability of methanol electrooxidation.

Abstract: This experiment was a study about the treatment of simulated dyestuff wastewater by coagulant of FeCl₃. The removal rates of turbidity and color were investigated by changing the dosages of the coagulant for dye wastewater. The experiment results showed when the concentration of FeCl₃ was 2g/L, the optimum dosages of FeCl₃ were 9,6 and 8mL for three kinds of simulated dye wastewater of direct sun-proof light green, yellow and scarlet. Under these conditions, the removal rates of turbidity were 86.2%, 83.6% and 93.4%, and the removal rates of color were 82.7%, 61.4% and 79.0%.