Advanced Materials Research Vol. 1035

Abstract: The chestnut shell pigment/SiO₂ composite was prepared by co-precipitation and thermal insolubilization and used to remove Cu (II) from water. The effect of the ratio of chestnut-shell-pigment to SiO₂ on the removal efficiency was studied. The sorption experiments were examined by batch method. The optimal initial pH of the copper solution ranges from 4 to 6. The equilibrium data were fitted with the Langmuir than the Freundlich, and the sorption mechanism of Cu (II) suits to the former. The maximum sorption capacity derived from the Langmuir was found to be 18.87 mg g⁻¹. The composite behaves an excellent potential for copper removal.

Abstract: Ti dopping Li_1.02(Fe_0.8Mn_0.2)PO₄/C (Ti=0.01,0.03,0.05,0.07) was prepared by high temperature solid-state method ,with LiH₂PO₄, LiCO₃, FeC₂O₄.2H₂O , Mn (CH₃COOH)₂.4H₂O TiO₂ as raw materails. Glucose (C₆H₁₂O₆) as carbon soures join in the mixture when ball milling. The structure and morphology of the samples were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). CHI660B electrochemical workstation was used to study the electrochemical performance of cathode material. The well-crystallized LiFePO4/C composite with homogeneous small particles was obtained after reacting at 700°C for 10h.

Abstract: By signature gathering system, the shaft-frequency electric field of ship’s physical scale model is measured. At the same time, the mechanism of the corrosion related to shaft-frequency electric field is also described. Results show that the shaft-frequency electric field signature arises around a vessel and transmits in the surrounding seawater due to the current flow from impressed current cathodic protection (ICCP) system and the current flow resulting from the corrosion of dissimilar metals during propeller rotation, which contains both shaft fundamental and harmonics. The signature character of electric field is more and more marked with the shaft rotation speed increasing. The amplitude of electric shaft-frequency electric field by modulating the current of ICCP system is 10 times greater than that of corrosion current. It is proved that the using a 1:100 physical scale model of a vessel to study the shaft-frequency electric field character is an effective method and provided an new way.

Abstract: Mg-Al-Fe ternary layered double hydroxides (LDHs) were synthesized based on Red mud by a calcination-rehydration method, and characterized using X-ray diffraction (XRD). The flame-retardant properties of EVA/LDHs (EVA, ethylene-vinyl acetate) composites were studied via cone calorimeter test (CCT), smoke density test (SDT), and Thermogravimetric analysis (TGA). The CCTs data indicate that heat release rates (HRR) of EVA/LDHs composites decrease in comparison with that of EVA, EVA/Red mud, EVA/ATH and EVA/MH composites. The SDT results show that LDHs is helpful to smoke suppression. The TGA show that LDHs-containing EVA2 has higher thermal stability at high temperatures than the other samples.

Abstract: Waste materials are utilized with an increasing frequency in the building industry, during the last decades. The motivation is both environmental and economical. In this paper, waste ceramic powder produced at the grinding of hollow brick blocks used in precise-walling technologies, is applied as a partial replacement of siliceous aggregates of lime plasters. The designed plaster mixes are analyzed from the point of view of their basic physical, mechanical, hygric and thermal properties. The bulk density, matrix density, open porosity, compressive strength, bending strength, water vapor diffusion permeability, water vapor diffusion coefficient, water vapor diffusion resistance factor, thermal conductivity and specific heat capacity are the investigated parameters. A reference lime plaster is analyzed as well, for the sake of comparison. Experimental results show a remarkable enhancement of mechanical properties of the plasters with the increasing dosage of ceramic powder. Moreover, the thermal insulation properties are improved and the water vapor diffusion capability of the plasters with ceramic powder increases.

Abstract: Effect of climatic loading on the physical properties of three different kinds of sandstone is investigated. The studied materials were used for masonry and ornamental parts of historical buildings over a long time period.The application of sandstone for building construction in the Central European region can be traced to the 14^th century and ends in the 19^th century, where the static function took over reinforced concrete. The samples of researched sandstones are exposed to the freeze/thaw cycles and the effect on materials performance is evaluated using measurement of several physical parameters. On the basis of obtained results, the materials behavior at real service conditions can be assessed, which is a necessary information for their practical usage in the reconstruction works on the historical monuments.

Abstract: In this paper, palladium-containing SBA-15 (Pd/SBA-15) was synthesized via a two-step method. In this procedure, Pd nanoparticles of 3-5 nm in size have been synthesized by formalin reduction method and incorporated into mesoporous SBA-15 silica during hydrothermal synthesis. The resulting nanocomposite with 1.20 wt% Pd loading was achieved with highly dispersed and uniform palladium nanoparticles. The catalytic activity of the Pd/SBA-15 nanocomposite was used as a catalyst for the Suzuki-Miyaura coupling reactions. The Pd/SBA-15 nanocomposite exhibited excellent catalytic activities and reuse ability in air for the Suzuki-Miyaura coupling reactions.

Abstract: The purpose of this paper is the development of flame retardant chef coats fabric. The main properties of polysulfonamide fiber are described , the research and development of the product processing of polysulfonamide /Aramid 1313 blended yarn and the union fabric with it and cotton yarn are explored. The technology problems of spinning and weaving are solved. The mechanical property , comfort property and flame retardance of the fabric of polysulfonamide /Aramid 1313 blended yarn and cotton yarn are qualified .The product can be used for high grade chef coats fabric.

Abstract: Manufacturing process of combined yarn with different filament size and cotton roving has been discussed. It shows that filament feeding point has some effect on combined yarn structure and yarn properties. If the filaments are fed from different sides of the cotton strand, they usually wrap the strand in parallel. If the filaments are fed from the same side of the strand, they wrap the strand crossed more often. Filament feeding point has an effect on yarn hairiness while it affects yarn breaking strength, yarn breaking elongation and abrasion resistance slightly. Yarn property weight is determined by subjective empowerment and Borda method is used to analyze yarn property. It has proved that if the filaments are fed from different sides of the cotton strand, the filament-roving space is set at 4mm respectively; the combined yarn shows the best.

Abstract: Polysulfonamide Aramid 1313 blended siro-spun yarns and silver-coated filament are used to weave flame retardant and antistatic fabrics. The effect of fabric weave and silver-coated filament content on flame retardant property and antistatic property was discussed. Two-factor analysis of variance shows that fabric weave and filament content have little effect on fabric flame retardant property, while they affect fabric antistatic property considerably. Fitting curve of antistatic property and filament content relationship was also established.