Advanced Materials Research Vol. 1090

Abstract: Based on the Lorenz-Mie light scattering theory, we have calculated the light absorption of single silicon nanowire with Si₃N₄ coating, and compared with pure single silicon nanowire. The calculated result indicates that there exists an enhanced absorption in the Si₃N₄-coated silicon nanowire and shows a great photocurrent enhancement factor (~70%) for the coaxial NW with the shell thickness of ~70 nm. For a special shell thickness (175 nm) in the Si₃N₄-coated silicon nanowire for r = 150 nm, the enhancement comes up to ~98.45%.

Abstract: A series of highly dispersed ionic liquid catalysts were prepared by immobilized acidic ionic liquid [BMIM]HSO₄ in silica gel through sol-gel methods. The structures and properties of the catalysts were characterized by FT-IR, SEM and XRD. The results showed the [BMIM]HSO₄ had been successfully confined or encapsulated in a silica-gel matrix.

Abstract: A series of highly dispersed ionic liquid catalysts were used for the oxidation desulfurization of dibenzothiophene (DBT) in model oil in the presence of H₂O₂. The effects of the loading of [BMIM]HSO₄ immobilized, reaction time, temperature, O/S molar ratio and the dosage of catalysts on DBT removal were investigated in detail. The catalyst with the loading of [BMIM]HSO₄ was 25% exhibited the highest activity. The DBT removal of model oil can reach 99.9% in 5 h at 60 °C, O/S molar ratio of 10, V_{model oil}=10mL, m_catalysts=2.00g. The catalysts can be easily recycled and can be recycled 2 times without a significant decrease in activity.

Abstract: The graphite ore from Australia is a sort of the low-grade and fine-scaled graphite ore. On the basis of the optimum rough grinding fineness, an open and a closed circuit tests were conducted which consist of one rougher, one scavenging, then four-time-regrinding and five-time-cleaning to the rough concentrate, one grinding and scavenging to the mixture of middling1~3, and the middling4~6 returned to the rougher, cleaning1 and cleaning2 respectively. Taking the kerosene, pine oil, lime as flotation reagents, the concentrate with grade improvement from 12.78% to 90.5% was achieved through the routine flotation method, as the flotation recovery rate reached to 92.46%.

Abstract: Hydrocracking of Venezuelan heavy oil with no catalyst, dispersed Mo catalyst and Mo/Al₂O₃ catalyst were carried out to investigate the effect of Mo/Al₂O₃ catalyst component on the composition of residue hydrocracked product. Experimental data revealed that both dispersed Mo catalyst and Mo/Al₂O₃ catalyst improved the conversion of Venezuelan heavy oil and inhibited the formation of coke, but the two types of catalyst have the opposite effects on generation of light products. Besides, the activity metal suppressed the formation of isomerization product while the acidity support enhanced it.

Abstract: LiFePO₄ based Lithium-ion batteries are prepared by nonionic waterborne polyurethane with different soft segments which act as binder. FTIR is used to characterize the structure of waterborne polyurethanes .The emulsion viscosity, mechanical properties of films are measured. The result shows that, the emulsion viscosity and tensile strength of polyurethane based polyether glycol are smaller than polyurethane based polyester. Charge-discharge, cycle performance and AC impedance spectroscopy measurement indicat that the first charge-discharge efficiency is 92%, the biggest discharge capacity is 115 mAh/g for lithium-ion batteries based on waterborne polyurethane as adhesive which equaled to PVDF, the batteries have a good cycle performance and high cycle efficiency and the impedance of batteries are small than PVDF.

Abstract: Simultaneous saccharification and fermertation (SSF) were studied to produce ethanol from corn stover, which include three continuous stages, stover pretreatment, cellulose fermentation, and ethanol production. Firstly, the crude was treated by propionic acid, and the disposal rate of lignin and hemicellulose in corn stover was 60.6%, 98.5%, respectively, with a residual rate of cellulose 90.68%. Then, cellulase production was carried out by Trichoderma reesei Rut C-30. 10% stillage and other nutrition were added to the pretreated corn stover, water moisture and initial pH were adjusted to 70% and 4.8, liquid inoculum was (1.7~2.0)×10⁷spore/g stover. The stover was kept under 30°C for 7d, then mixed with equal pretreated stover. Ratio of water was 2, the inoculum was 3.2×10⁷cell (Saccharomyces cerevisiae)/g substrate, After incubated at 36°C for 72h, the SSF process achieved a yield of ethanol (0.326g/g substrate).

Abstract: The PCE has a great relationship with the work function of conductors in organic and printed electronics devices. And organic photovoltaics require an electrode with a work function (WF) that is low enough to either facilitate the transport of electrons in and out of various optoelectronic devices or collect electrons from the lowest unoccupied molecular orbital (LUMO) of a given organic semiconductor. In inverted organic photovoltaics, the ITO is normally used as cathode to collect electrons .By using PDDA deposition, the surface work function of ITO can be decreased by 0.3 eV, which is able to improve the electrons transport and the PCE in OPV, as it has been proved that the surface electronic potential of ITO is very sensitive to the presence of self-assembled molecular layers.

Abstract: Rubber suspension system is a new suspension system in which rubber is used to be the elastic element, thus rubber spring is one of the key components of suspension. Based on its concrete structure, a finite element model of rubber spring is made and so as to analyze the rubber suspension forces under different working conditions, to analyze the strength and stiffness for providing a reference for the design.

Abstract: This paper introduces fuel storage tank arrangement and the saddle structure of 296600 tons oil tanker (VLCC). According to the relevant standard, using ANSYS software, finite element modeling of the saddle and nearby hull structure is created. The radial force distribution function of the saddle is deduced under various conditions. The accurate stress state for saddle and nearby is found out by the application of finite element direct calculation method. Through the analysis of the results, the improvement measures are given and the reference for the saddle structure design is provided.