Abstract: The paper preliminary studied the photocatalytic efficiency of the filter residue of the acidolysis of high titanium slag (RAHTS) with hydrochloric acid, and explored the photocatalytic efficiency on the acid methyl orange solution under the mercury lamp irradiation. With RAHTS performing as a raw material to react with hydrochloric acid, and then the substance content, nature and catalytic efficiency of the filter residues were examined by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and photocatalytic reaction apparatus. Through the experimental investigation, the photocatalytic degradation efficiency on the methyl orange of the filter residues increased with the acid-sludge ratio, reaction time, reaction temperature, and the concentration of hydrochloric acid. When the temperature was 100°C, the reaction time was 4 h, the concentration of the hydrochloric acid was 6 mol/L, the acid-sludge ratio was 1, the filter residues showed a best photocatalytic degradation efficiency. Under that experimental condition, the degradation rate was as high as 85.1%.
Abstract: In this paper, a kind of abundant and environment-friendly material—epoxidized soybean oil (ESO) was chosen to be esterified with acrylic acid to produce acrylated epoxidized soybean oil (AESO). By studying the influence of various factors including feed rate, reaction temperature, feed ratio, catalyst and inhibitor on the reaction, we got the optimal synthesis conditions: feed ratio is 1.25:1; reaction temperature is 120 °C; feeding time is about 2.5h;the dosage of the inhibitor (TBC) is 0.15 % and the catalyst (Triphenylphosphine oxide) is 1.5 %. The AESO we prepared has low viscosity, low skin irritation, excellent pigment wetting characteristics and so on. It can also be widely used in the manufacture of coating, printing ink, paint, etc.
Abstract: The information about the structure and properties of the synthesized nanodisperse additive based on the aluminosilicates of calcium, intended for the production of limy dry construction mixes are provided. It is shown that the mineral composition of an additive is presented by crystal types of hydroxides of aluminum (bayerite and boyhmite) and the nanostructured amorphous aluminosilicate of calcium. It is established that the additive based on the aluminosilicates accelerates the process of hardening of limy compositions.
Abstract: According to the structural features of 3-D braided composites, the whole structure is divided into three types of sub-unit cells, these are the interior unit cell, the surface unit cell and the corner unit cell. Considering the bending of fiber bundle and the deformation of cross-section which are caused by the space fiber extrusion and twist together, the corresponding geometric analysis models for every type of sub-unit cell are established, and the engineering elastic constants of the 3-D braided composites are predicted. The results show that the calculated results well agree with the experimental results, and the effectiveness of the model is verified.
Abstract: The influence of barium doping on the oxygen-ion diffusion and phase transition in the La2Mo2-yWyO9-δ (y=0, 1.0) oxide-ion conductors has been systematically investigated via dielectric techniques. In the Ba-doped La2Mo2O9 samples there are only two dielectric relaxation peaks Pd1 and Pd2, which are associated with the short-distance diffusion of oxygen vacancies. But in the Ba-doped La2MoWO9 members, three peaks are detected, including peak Pd1, Pd2, and peak Ph. The last is associated with the phase transition process from the static disordered state to the dynamic disordered state of oxygen ion/vacancy distribution.
Abstract: With cooling tests on polypropylene fiber reinforced concrete and plain concrete that were initially subjected to different heating temperatures, the change of mechanical properties including mass loss, uniaxial compressive strength and microstructure were analyzed. The results show that the compressive strength of concrete tend to decrease with an increase in temperature. After experiencing high temperatures, the internal fibers of the polypropylene fiber reinforced concrete melted and left a large number of voids in it, thereby deteriorating the mechanical properties of concrete.
Abstract: The present paper reports a new type of medicated nanofibers loaded with naproxen, which were fabricated using a coaxial electrospinning process with only ethanol as the shell fluid. Field emission scanning electron microscopic observations clearly showed that high quality linear nanofibers with smooth surface and an average diameter of 270 ± 60 nm were generated under a shell-to-core fluid rate ratio of 0.2. X-ray diffraction patterns suggested that the drug was distributed homogeneously in the polymer matrix. In vitro dissolution tests demonstrated that the nanofibers could release the entire contained drug in one minute, whereas the commercial naproxen dispersible tablets took over 40 minutes to exhaust all the drug. The coaxial electrospinning process can provide new way for developing novel drug delivery systems.
Abstract: With the means of thermodynamic calculation and alloy smelting, the reaction of Mg-Y-Mishmetal-Zr melt in the process of smelting is studied and the relevant thermodynamic data are obtained. The results show that when rare earth (RE) reacts with MgO to seize the oxygen, Y has the strongest capacity while La has the weakest capacity, and Y is most likely to be burned due to preventing melt oxidation. In the reaction of between RE and covering flux, relative to other elements, Ce is less likely to be burned while Y and La are more likely to be burned. The actual smelting result is consistent with the calculation.
Abstract: Polyamide, is engineering materials, has been widely used due to their high mechanical properties and good chemical stability although their moisture absorbtion can cause problems. In recent years, polyamides have been used as wear resistance materials due to their self-lubricating characteristics as well as good strength and stiffness . However the high dry friction coefficient of polyamides restricts their application. Thus, modifying polyamides to improve the abrasion resistant property is desirable.