Advanced Materials Research Vols. 734-737

Abstract: Warm Mix Asphalt (WMA) technology is increasingly popular in pavement construction. In the summer of 2012, a field trial project using Sasobit-WMA was established in the Huanhu East Road project, Changzhou city. In line with this trail field project, two addition ways of Sasobit were discussed to evaluate pavement performances in terms of workability, rutting resistance, low-temperature cracking and moisture susceptibility. Results identifies that the Sasobit-WMA has benefits of the workability, rutting resistance over the HMA. Although reduced anti-cracking and water stability performances occurred for the WMA, there is no significant difference between them. For Sasobit addition ways, the dry process has an easier workability and a better anti-rutting performance than those of the wet processes. Compared with the wet processes, the dry process has a slight reduction on anti-cracking and water stability performances. However, these reduction are under the control of specifications and also suitable for pavement construction.

Abstract: HgS nanoparticles were loaded on the silica microspheres by an improved layer-by-layer self-assembled technique following low temperature heat-treatment. The optical properties of HgS nanoparticles on the silica microspheres were characterized with UV-vis and fluorescence spectra. The results suggested that the HgS nanoparticles were formed on the silica microspheres, and the average size of particles was approximately 15 nm. The direct band gap of the loaded HgS nanoparticles was calculated to be 2.4 eV from the absorption spectrum, which was blue-shifted by 0.4 eV from its bulk value due to quantum size effect. The photoluminescence showed a broad emission around 440 nm from sulfur vacancies. These results indicate that the optical properties of HgS nanoparticles loaded on the silica microspheres are similar to those of free HgS nanoparticles, which is encouraging for potential applications.

Abstract: In this paper, a kind of new biomass cellular material was prepared by the growth of forage grass such as annual ryegrass, tall fescue, and trefoil in the molding container. In the process of growth, the molding container had been inverted repeatedly. Effect of temperature on the growth of three kind of forage grass was researched by seed germination experiment. The properties of the material were evaluated by TG and universal testing machine. The results showed that 25°C was the optimum growth temperature, and under this condition the germination percentage and germination potential of annual ryegrass, tall fescue, trefoil were respectively 93.67%, 91.67%, 84.33% and 83.00%, 81.67%, 80.67%. The biomass cellular material had good mechanical properties. By changing the addition of seeds, mechanical properties could be adjusted for various end uses.

Abstract: According to a new version of equations of elasodynamics of quasicrystals suggested by Ref, a finite difference method of the anti-plane elastic dynamic equations of 1D hexagonal and 3D icosahedral quasicrystals is developed. Further the dynamic behaviour of the material with a model III crack under impact loading is given.The results show dynamic stress intensity factor of the crack tip, in which the similar and different features with conventional materials are discussed, especially the phonon,phason and phonon-phason coupling effects are explored.

Abstract: A correct composition of two kind of magnetic anisotropy of ellipsoidal nanoparticles: crystalline anisotropy and shape anisotropy - has been carried out. It was shown that according to the shape anisotropy the effective anisotropy constant can change non-monotonically. The temperature dependence of effective anisotropy constant on the angle defining the position of effective axis was calculated. It was found out if the angle between the crystalline anisotropy axis and the long axis of nanoparticle exceeds π/4, then the effective constant as well as the position of effective axis has to change non-monotonically according to changing of temperature.

Abstract: A composite of AgIn₅S₈/AgInS₂ was prepared in aqueous solution by a simple low temperature process using mercaptoacetic acid as capping agent and thioacetamide as sulfur source. The composite was characterized by Xray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. The obtained AgIn₅S₈/AgInS₂ composite showed high visible photocatalytic activity for the degradation of methyl orange with 97.5% of degradation efficiency of methyl orange under visible irradiation for 10 min. Under same conditions, furthermore, the AgIn₅S₈/AgInS₂ composite displayed better stability than that of pure AgIn₅S₈ and AgInS₂.

Abstract: The consolidation theory and test results of unsaturated soils were summarized in detail in this article, which include the recent development. And some existent difficulties and problems for consolidation theory of unsaturated soil were also summarized. The consolidation theory of unsaturated soils have well applicable future, but the theory is not mature and need the investigators’ further research.

Abstract: A new method that nanoSrTiO₃ electronic ceramics powder was prepared from nitrilotriacetic acid complexes by thermal decomposition was proposed. The reaction of Ti⁴⁺ and ta^3-(H₃ta=C₆H₆O₆N) and H₂O₂ is occurred to form [Ti₂O(O₂)₂(ta)₂]^4- complex ions, which react with Sr²⁺ to produce Sr₂[Ti₂O(O₂)₂(ta)₂] precursor, and then is washed, dried and annealed at 900°Cfor 3h to prepare nanoSrTiO₃ powder. The results of SEM analysis show that SrTiO₃ powders were spheric shape with narrow size distribution and the mean particle sizes about 80 nm. XRD investigation show that the powders of SrTiO₃ had the crystalline of the pseudo-cubic structure. The Sr/Ti mole ratio (1.000±0.005) and the purity of 99.8% were confirmed by chemical analysis. Compared with conventional thermal decomposition method of oxalate, the proposed new method, by which the high-quality SrTiO₃ powder is prepared, shows simple technology.

Abstract: Sol-gel method is used for the formation of Pb_0.499Sr_0.499TiO₃ (PST)thin films. The initial films were prepared with spin coating sol solution on silicon wafer and drying at room temperature and then heating coated dry sol film at 400°C for 10min. This process was repeated for 1-4 times to obtain 4 initial films with different thicknesses. The 4 initial films were annealed at 700°C for 2h to obtain PST ceramics films. The morphologies of the surface and cross-section of PST films were observed with a scanning electronic microscope (SEM). The phase structures of PST films were analyzed using X-ray diffraction meter (XRD). Experimental results show that PST film prepared by coating sol on silicon with different thicknesses can be high smooth,uniform and compact film.

Abstract: This article by orthogonal experimental method to determine the composition of chromate conversion and use of electrochemical method of electrochemical corrosion of the film discussed the substrate in different components, content, time and pH of chromate conversion coating of corrosion resistance. Orthogonal to determine the best experimental chromate conversion solution by adding the rare earth element cerium and lanthanum salt, and discuss the effects of rare earth elements cerium and lanthanum chromate conversion film on the anti-corrosion. The results show that in CrO₃ 5.4 g/L, NaF 0.5 g/L, K₃Fe (CN)₆ 0.5 g/L, pH 1, conversion time is three minutes, there is a better corrosion resistance. The rare earth elements in a chromate conversion solution, La₂(CO₃)₃ to 0.2 g/L chromate conversion coating of the anti-corrosion better.