Advanced Materials Research Vols. 393-395

Abstract: Curing characteristics of low-toxicity urea-formaldehyde (UF) resin in different curing system were studied by differential scanning carlorimetry (DSC). Test results showed that the initial orterminal temperature and activation energy needed of curing reaction for low-toxicity UF resin were different in different curing system. The initial temperature of curing reaction for low-toxicity UF resin and activation energy were the lowest, and exotherm was most under curing system C, which showed the acceleration of curing system C on low-toxicity UF resin was best. The appropriate curing system can be optimized and applied for hot-press process in practical production by means of DSC to investigate curing characteristics of low-toxicity UF resin.

Abstract: Focusing on the current urban environmental sanitation facilities, this paper analyzes the current status of environmental sanitation facilities. Combining with various objects and life patterns in daily life, it discusses about the wide application of landscape environmental sanitation facilities in real life and particularly studies the landscape property of garbage containers. The advanced technologies are employed in the garbage disposal containers to design the environment-friendly, green and energy-saving new-type landscape environmental sanitation facilities. Moreover, it points out the significance of creating new technology and new concept in the urban landscape facilities, and adopts the innovative idea and new concept to realize the harmonious and wonderful human settlement.

Abstract: Different shaped samples of soaked leather in dichloromethane solution was pretreated by ultrasound technology, then the grease content in solution was measured by soxhlet extraction method. Samples before and after extraction were respectively made into histology slices in order to visually observe the situation of grease content. Results showed that compared with conventional extraction methods, extraction time was reduced to1/6~1/7 times and 50% solvent was saved by ultrasonic technology. Histology photos exhibited a cleaner extraction situation, which indicated that ultrasound technology behaved more efficient than conventional method in grease extraction.

Abstract: This paper studies jet fuel’s silver strip corrosion property and analytic technology with different sulfide compounds, and gives the experimental results of the corrosiveness of sulfide, analytic test of total sulfur and elemental sulfur. And then, the chemical compounds, which lead to jet fuel’s silver strip corrosion, are also researched by the experiments of the acid, the alkali, the water, mercury scrubbing and silver nitrate, and through the analyses of the content of halogen, nitrogen compound, the constitute of corrosion products and XPS spectrum. Therefore, the referencing of these research works is helpful to analyze the existence state of sulfide in jet fuel and provide a theoretic foundation to clarify the reason of jet fuel deterioration and silver strip corrosion.

Abstract: Taking the method of shotcrete and rock bolt support can effectively keep slope stability and prevent soil erosion, but this method also makes the local microclimate change. This paper is to discuss the microclimate effect of revegetation on concrete slope, which take the excavated slope in Guandi hydropower station as the research object. The results show that, vegetation can significantly reduce the ground temperature and increase humidity on concrete slope, and adjust humidity changes. Especially under the conditions of high temperature in sunny day, the microclimate regulation effect of vegetation on naked slope is more obvious.

Abstract: Controlled microwave irradiation has been employed in the improved process to prepare two main dialkylimidazolium-based ionic liquids: 1-butyl-3-methylimidazolium(BMIMCl) and 1-allyl-3-methylimidazolium chloride (AMIMCl). The synthesis process was studied by determining the production yields at certain interval time. Results shown the reaction was accelerated by 8 and 4 times respectively, and production yields were increased by 5.5% and 5.9%. Differences in synthesis between [AMIM]Cl and [BMIM]Cl indicated the improvement of the reaction rate of [BMIM]Cl was clearer because of the inerter reactant. FT-IR and 13C NMR were carried out and results shown the two ionic liquids were successfully synthesized.

Abstract: A three-dimensional model of molecular dynamics (MD) was employed to study the nanometric cutting mechanism of monocrystalline silicon. The model included the utilization of the Morse potential function to simulate the interatomic force between the workpiece and the tool, and the Tersoff potential function between silicon atoms. Amorphous phase transformation and chip volume change are observed by analyses of the snapshots of the MD simulation of the nanometric cutting process, energy and cutting forces. Dislocations and elastic recovery in the deformed region around the tool do not appear. Cutting forces initiate the amorphous phase transformation, and thrust forces play an important role in driving the further transformation development. Nanometric cutting mechanism of monocrystalline silicon is not the plastic deformation involving the generation and propagation of dislocations, but deformation via amorphous phase transformation.

Abstract: Pure wood vinegar is widely used in industry, agriculture and other areas as regulators, but the wood vinegar which produced usually is filled with oil on the surface .The paper mainly study on removing the floating oil on the surface of wood vinegar,choosing the best surfactant called Tween 80 to removing the floating oil and making wood vinegar in a steady system. By this way, it will not appear oil on the surface of wood vinegar for more than half an year, which will broaden the commercial application of wood vinegar

Abstract: A novel Schiff base, 2-(Salicylideneamino)pyridine (2-SAP) synthesized by 2-aminopyridine and salicylaldehyde was used as a fluorescence probe to determine superoxide anion radical (O2•-) in this study. The synthetic product was characterized by IR, 1H-NMR and GC-MS methods. A fluorescence quenching reaction occurs between 2-SAP and O2•-, and the fluorescence intensity decreased significantly. The effect of pyrogallol concentration (2.0×10-5 M to1.0×10-3 M) was discussed in this study. In the range from 2.0×10-5 M to 1.0×10-4 M, relative fluorescence intensity (y) and pyrogallol concentration (x) shown a good linear relationship, y=37.801x+76.854, r=0.993. Based on this phenomenon, the O2•- generated by pyrogallol autoxidation could be determined simply with high sensitivity.

Abstract: Because of the excellent properties and wide applications on nanomaterials, recent years, researchers start to focus on the use of nanomaterials in wastewater treatment. This paper investigated the antimicrobial activities of ZnO against Gram-positive and Gram-negative bacteria strains – E. coli and Sarcinic pseudomycosis. Growth curves of bacteria strains were used to estimate the antimicrobial activities of ZnO suspensions. This work showed pH values of ZnO suspension did not affect the antimicrobial activities of ZnO. Besides, when treating small number of bacteria slurry, ZnO expressed the killing action. Based on this work, the possible antimicrobial mechanism is also discussed in this paper.