Advanced Materials Research Vol. 662

Abstract: High pure zinc with trace titanium of various contents was prepared by the method of master alloy preparation, and electrochemical characteristic difference in seawater was discussed. The result reveals that there is a minimum of self corrosion current density at 0.04% titanium content in high pure zinc in seawater of Qingdao seashore, and trace addition of titanium may increases the potential stability but not change the corrosion behavior of high pure zinc in seawater.

Abstract: Pt-modified nickel aluminide coatings have been more widely used for protection of jet-engine components against high-temperature oxidation. The coating rumpling of two Pt-content NiPtAl coatings was studied in this paper during high temperature exposure. The results indicated that the NiPtAl coating grains size made a great contribution to the oxide surface morphologies, especially rumpling. Smaller grain size within high-Pt coating indicated a denser rumpling compared to low-Pt coating due to PtAl2 formation in the earlier coating. The failed local alumina at the ridges was also found on the low-Pt coating after cyclic oxidatioin. It was found that polished treatment resulted a comparatively flat and homogeneous oxide layer compared to as-received coatings. The temperature cycling could promote the aluminide coating rumpling, however, the polished treatment could not completely eliminate the roughening.

Abstract: To research the corrosion of clad pipe weld joint, commenting the welding processes of and analysis of the corrosion medium of clad pipe weld joint, using electrochemical impedance spectroscopy carried out the comparative analysis of Nyquist and bode diagram within the time limit of clad pipe weld joint. The results showed that: 316L/20G clad pipe weld joint in the sewage water up to two weeks, because of the passive film thickening, weld corrosion resistance up to the maximum, and then stabilized; Its resistance is slightly decreased, but still has a good corrosion resistance, therefore, 316L/20G clad pipe can be widely used in the sewage pipelines of oil and gas fields.

Abstract: The extraction and purification of tea polyphenols(TP) and EGCG from green tea extraction by nano-membrane filtration, resins absorption and column chromatographic exctration(CCE) were studied. The results indicated that the concentrations of TP and EGCG respectively increased to 35.21% and 13.56% after separated by the hollow fiber membrane with the molecular of 1.0×104. And then, after the absorption of polyamide resins, the concentrations further increased to 95.51% and 52.56%. Finally, the product with the EGCG concentration of 98% was obtained by silica gel CCE method.

Abstract: As an environmentally friendly technology, the fuel cell is one of the alternative technologies that can replace fossil fuels. Various types of fuel cells are available in the market, including the solid oxide fuel cell (SOFC). The planar and tubular designs of SOFC are the leading designs mentioned in the literature. Several factors such as manufacturing cost, manufacturing process and production scale differentiate between the two main designs. Each cell component can be produced using a number of methods, two of which are the most common, namely dry pressing and screen printing techniques for the making of planar SOFC. This paper thus reviews several works that have utilized each of the fabricating methods mentioned. The processing steps, technical parameters, and results, such as the maximum power density of each method are discussed.

Abstract: The influence of phosphoric acid and iron vitriol on the properties of magnesium oxychloride cement is studied in this paper. The experiment indicated that phosphoric acid and iron vitriol can improve the water-repellency of magnesium oxychloride cement. The softening coefficient is about 1.014 when the dosage of phosphoric acid is 1% and the softening coefficient is about 0.77 when the dosage of iron vitriol is 4%.

Abstract: The influence of dosage of fly ash on the properties of magnesium oxychloride cement was studied in this paper. The results indicated that the compressive strength of magnesium oxychloride cement remained unchanged when the dosage of fly ash was 5%. The compressive strength of magnesium oxychloride cement declined when the dosage of fly ash between 10%-30%. Fly ash can enhance the water-repellency of magnesium oxychloride cement and the softening coefficient was about 0.90.

Abstract: In order to produce high gel strength egg white powder, Box-Behnken model was used to optimize the heating conditions in dry state of egg white protein production process. The gel properties of egg white powder were determined in various conditions. Results showed that the optimized conditions of heating conditions as follows: 84.8°C of temperature, 10.3 days of heating time, 10.3 % of relative humidity. Gel hardness of egg white powder increased from 408.36 g to 952.62 g through this treatment under the conditions. A tight and more uniform network with constant stability was observed in the gel of egg white powder after heating in SEM (5000×). The results showed that heating in dry state is an efficient method to improve gel properties of egg white powder.

Abstract: Al films were prepared by DC magnetron sputter deposition at different substrate temperatures. The sheet resistance of the films was measured by four point probe sheet resistance meter, and the film thickness, which was obtained by surface profiling system. The surface and cross-section morphology of the films was observed by AFM and FESEM. As a result, the resistivity of the films decreases obviously as the substrate temperature increases gradually. The higher substrate temperature is, the rougher the films surface is and the larger the grain size is.

Abstract: Glucomannan extracted from konjac was sulfated (konjac oligo-glucomannan sulfate, OGMS) to show selective anti- coxsackievirus B activity in vitro using Hela cell line as the host cell of coxsackievirus B. OGMS straight inhibited the virus according to different groups and CVB-RNA Replication in Hela cell by RT-PCR. The studies indicated that OGMS mainly acted as blocking virus invading function and its IC50 was 0.1483 mg/mL determined by Reed-Muench method and CVB-RNA Replication was inhibited as well. All these indicated that OGMS had evident in vitro anti- coxsackievirus B activity.