Advanced Materials Research Vols. 335-336

Abstract: The LiFePO₄ nanoparticles with high crystallinity were prepared using polyol process without any further heating as a post step, which will greatly economize in time and energy comparing with other conventional synthesis method. The temperature of the polyol solution was rapidly increased up to 550 K and maintained for 24 h in a round-bottomed flask attached to refluxing condenser to obtain nanoparticles. The X-ray diffraction (XRD) pattern was indexed on the basis of orthorhombic olivine-type structure without any unwanted second phase. The scanning electron microscopy (SEM) images of the samples showed the needled and flaky shapes of particles with uniform size in the range of 50-250 nm. It is noted that the nanoparticle was in favor of shortening the diffusion path to improve electrochemical performance. A reversible specific capacity around 160 mAh·g^-1 at 0.1C rate was achieved without capacity fading during the 20 cycles.

Abstract: For the use of Fuel Cells in transportation, one of the key points is to reduce Pt loading in Pt/C catalytic electrode. In our study, a new type of Pt/C membrane electrodes, PtCuLaO_x heterogeneous structure, in which with developing different La content homogeneously dispersed on the surface of carbonaceous substrates was manufactured by Ion Beam Sputtering (IBS) technology, and also was treated by different annealing temperature in muffle furnace. It was found that PtCuLaO_x heterogeneous membrane with Pt loading less than 0.05mg/cm² (the electrode area) in which its having complicated valence state, indicated that Pt had mutual effect with Cu, La and O, respectively. In addition, along with increases the annealing temperature, the instant result was to promote alloying of Pt, Cu and La in PtCuLaO_x/C catalytic electrodes.

Abstract: It is in great request to substitute foamed concrete for organic thermal insulating materials that are inflammable and liberate virulent gases on burning. In current study, felsite powder (powdery magnetite mill tailings) was used as filler and Solvay distiller waste (DW) was used as hardening accelerator for foamed concrete. The results showed that the strength and strength-to-density ratio of foamed concrete in cement-felsite powder system is much higher than those in cement-sand system and cement-lime-sand system. The Solvay distiller waste, suspending agent and polypropylene fiber can improve performances of foamed concrete such as cohesion and strength. DW can reduce shrinkage in forming process of foamed concrete.

Abstract: The problem and several restricted factors of agriculture application of sewage sludge are analyzed at home and abroad. Meanwhile, this paper points out that the several restricted factors of agriculture application include mainly: hazardous chemical matters and heavy metal, receptivity of farmers and consumers to the product of sewage sludge, perfect policy and criterion standards, disposing charge of sewage sludge. The several restricted factors of agriculture application should be resolved if sewage sludge is used safely and environment.

Abstract: This paper presents the experimental results on the simply supported PFRP channel beams subjected to three-point loading. The objectives of the research work are to investigate the effects of the span (L) of the beams on the behaviors, the critical buckling moments and the modes of failure of the beams, and to compare the obtained critical buckling moments with those obtained from the modified LFRD steel design equation in order to check the adequacy of the equation. The beam specimens have the cross-sectional dimensions of 102×29×6 mm with span-to-depth ratio (L/d) ranging from 20 to 40. A total of ten specimens were tested. Based on the test results, it was found that the load versus mid-span vertical deflection relationships are linear up to the failure, but the load versus mid-span lateral deflection relationships are geometrically nonlinear. The general mode of failure is the flexural-torsional buckling. Finally, the modified LFRD equation can satisfactorily predict the critical buckling moment of the PFRP beams used in this study.

Abstract: The influence of sp² hybridization on friction and structure of diamond-like carbon (DLC) films was studied by first-principles molecular dynamics. First-principles calculations have been performed using the pseudo-potential plane wave method. Our results show that: 1) The buffer role of sp²-hybridized state carbon between grain boundaries greatly affected the residual stress of DLC film, and hence the friction decreased steadily with the increased in sp² hybridization content. 2) For thinner films, there was very greatly differences in stress between diamond-like carbon film (110) surfaces in <001> and<1-10> directions. The difference in friction force between soft and hard directions was nonexistent, when the sp²-hybridized state carbon atoms increased to 80%, perhaps because the originally hard C-C and C-H bonds changed, and steadily reject interaction was drive break.

Abstract: The magnetorheological elastomer has a broader potential application due to overcoming the settlement, poor stability, sealing problems and other shortcomings of magnetorheological fluid easily. Firstly the magnetorheological elastomer is prepared, and then it is experimentally proved that the magnetic effect of magneto-rheological elastomers is occurred under magnet field and the stiffness can be also adjusted by controlling the density of field through performance experiments. In this paper, a squeeze mode magnetorheological elastomer vibration isolator and a test rig are designed, it has been shown that the natural frequency of vibration isolator is changed, and the effect of vibration isolation is preferable from the amplitude-frequency characteristic curves for vibration control experiments.

Abstract: Recycling of waste paper is one of pop topics of pulping and papermaking industry. Deinking technology is the key of recycling of waste paper. It is briefly introduced that methods of waste paper deinking and mechanism of deinking and constitute of deinking agent.

Abstract: A kind of composite filler was prepared by using talc, 85^。SR softwood pulp and CPAM. The effects of talc-fiber composite fillers on paper were investigated. The results showed that the composite fillers mainly adsorbed onto the surface of external fibrillatioed fibrils. Compared with commercial talc, the paper wih composite fillers addition had higher tensile index. It also showed that the composite fillers had some negative influence on drainage effect, when compared with the blank samples. Composite fillers which were prepared at CPAM dosage 0.6% had better effects on preparation of high filler paper.

Abstract: Salt slurry is the solid waste of the salt industry. The study object is the salt slurry in Jianghan Salt & Chemical Complex. This study investigates the application of the salt slurry in high density polymer saturated brine-based drilling fluid. This laboratory study indicates that the salt slurry may improve the rheology behavior of the drilling fluid, and may measure up both the API and the HTHP filtrate loss. On the premise of the same density and pH value as the basic drilling fluid recipe, with the increasing of the salt slurry, the YP/PV value increased, but the friction coefficient of the mud-cake increased. This investigate will reduce the cost of the high density polymer saturated brine-based drilling fluid with the salt slurry as a resource, and will have important significance for both recycling economy and the cleaner production of the salt industry.