Advanced Materials Research Vol. 704

Abstract: Acid Hydrolysis studied in this paper was in order to increase the content of cucurbitacin B

Abstract: The extraction of uranium from aqueous model solutions, as well as from real solutions reulting from leaching uranium ores was carried out in the system equipped with the Liqui-Cel® Extra-Flow membrane contactor with polypropylene capillary membranes. D2EHPA in toluene was used as an organic phase. Different arrangements of flow inside the membrane module were tested. The better approach appeared to be the arrangement with aqueous phase in the shell side of the contactor and organic phase inside the capillary membrane. The extraction efficiency for model solutions reached 95% and 87% for real post-leaching liquors.

Abstract: The H₂O₂ biosensor was prepared by continuous processes: 2,3-dimercaptosuccinic acid (DMSA) self-assembly monolayers gold nanoparticles (AuNPs) film by electrodepositioncovalent immobilization of horseradish peroxidase (HRP). In pH 7.2 phosphoric buffer solution (PBS), the HRP-AuNPs-DMSA-Au electrode exhibited a pair of well-defined cyclic voltammetric peaks in H₂O₂ solution, and the oxidation peak is about +0.4V versus saturated calomel electrode (SCE). The resulting substrates were characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The biosensor exhibited remarkable sensitivity towards H₂O₂ and a wide dynamic range of 2-800 μM. The electrode retained 90% of its initial activity after 30 days of storage at 4°C.

Abstract: according to analyzing and summarizing the literature of ilmenite concentrate smelting titanium slag, comes to conclude: the production process of ilmenite concentrate smelting titanium slag can be divided into the one-step method and two-step method, dominated by two-step method at home; foreign dominated by two-step. This paper introduces the main content of one-step method and two-step method, and compares the two methods from aspects of technology, quality, cost and environmental protection, and finally summarizes it.

Abstract: Horseradish peroxidase (HRP) was immobilized on the glassy carbon electrode surface by using GR, and GR/HRP/chit modified electrode was prepared. The electrochemical behaviors of GR/HRP/chit/GCE were studied by many electrochemical methods. Immobilized HRP showed a pair of stable redox waves, and oxidation peak was very small, the reduction of peak potential for 0.33 V vs. SCE and retained its bioelectrocatalytic activity for the reduction of H₂O₂. At the same time, a series of related parameters of the enzyme electrical activity were calculated, further experimental results reflected the enzyme mechanism in the process of reaction.

Abstract: The new technique for the TiO₂ photocatalyst manufacturing with titanium tetrachloride alcoholic solution using was revealed. The ammonium titanate precursor was precipitated by double-jet method with TiCl₄ alcoholic and ammonium aquatic solutions using. The TiO₂ nanopowders were prepared by precursors calcinations at 400, 500, 600, 700 and 800°C. The photocatalytic activity determination was made by the way of dye photodegradation technique (methyl orange). The difference in adsorption ability of TiO₂ dispersion reference to organic dyes was found. The conditions for the synthesis of TiO₂ anatase effective photocatalyst synthesis were revealed.

Abstract: Li/graphite fluoride (GF_x) cells, with highest theoretical capacity in primary lithium batteries, high energy density, long shelf life, safety and a wide operating temperature, have been widely noticed during the past decades. However, the low electronic conductivity and discharge potential of Li/GF_x cells obviously limited its applications. The key to improve the energy performance of Li/GF_x cells is to increase the transportation ability of Li⁺ in cathode materials. Considering its high specific surface area, large bulk volume and layer spacing, Ketjenblack is used for preparing the cathode materials with highly stored energy. Based on gas-solid fluorination, we synthesized the fluorinated Ketjenblack (FKB). As the cathode materials of lithium batteries, electrochemical assay show that the lithium/FKB cells have a novel discharged voltage of 3V versus Li/Li⁺ electrode, and a special capacity near 800 mAh g^-1. The lithium/FKB cells may be used for a new highly stored energy device.

Abstract: The effect of the surface compressive stress (CS) on the wettability of the chemically strengthened glasses on air side and tin side was investigated. The wettability of the air side of the raw glass is better than the tin side. After chemical strengthening, the surface energy of the air side decrease with the decreasing of the CS while the tin side is just the opposite. These results demonstrated that the wettability of the chemically strengthened aluminosilicate glass could be controlled by the compressive stress.

Abstract: Expanded graphite (EG) was ball-milled in a high-energy mill (planetary-type) under an air atmosphere. The products were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The anti-friction effect of milled EG used as lubricating additive was investigated. After ball-milling, the relatively ordered graphene planes of original EG become deformed, and the d₀₀₂ spacing becomes broadened. The milled EG used as lubricating additive have an anti-friction effect, and the effect is more marked than that of original EG.

Abstract: The microstructure and electrochemical properties of Ce-containing 7072 Al alloy were investigated through transmission electron microscopy (TEM), scanning electron microscopy (SEM) and Tafel polarization analysis. It was found that Ce alloying could result in a formation of finer grains in the simulated brazing alloys. The 7072 Al alloy with 0.15% Ce had desirable distribution of precipitates. The electrochemical testing results indicated that Ce element had a great impact on the corrosion potential of the alloy tested in 0.5% NaCl solution. Alloying with 0.15% Ce element could make the corrosion potential shift to inert direction and reduce the corrosion current density. An excessive Ce addition could weaken its positive effect on the corrosion resistance of the Ce-containing alloy.