Advanced Materials Research Vol. 1081

Abstract: This document demonstrates how to affect the brightness of liquid package recycled pulp by hydrogen peroxide bleaching and FAS beaching. The optimum H₂O₂ bleaching process conditions: 8% H₂O₂, 4% NaOH, bleaching temperature 80 °C, bleaching time 1.5h. The best FAS bleaching conditions was FAS dosage of 0.5%, NaOH dosage of 0.25%, bleaching temperature at 80 °C, time for 30min. And bleaching had no adverse effect on the performance of bleached pulp fiber.

Abstract: The electrodeposition of zinc from acidic sulphate bath on steel substrate has been studied. The influence of sodium dodecylbenzenesulfonate (SDBS) as surfactant on the mechanism of the electrodeposition process has been investigated using potentiodynamic and cyclic voltammetry (CV) techniques. From the analysis of CV analysis, it is shown that in the surfactant free bath solution, hydrogen evolution occurs together with the zinc deposition. The presence of SDBS shifts the reduction potential of Zn²⁺ to more negative values, indicating that SDBS to some extent hinder the Zn electrodeposition.

Abstract: Borated water leakage could lead to boric acid corrosion of nuclear equipment, and it’s a danger to the pressurized water reactor nuclear power plants (PWRs). In this study, the principle of boric acid corrosion was studied first. Through the experiences of borated water leakages and boric acid corrosion at home and abroad, the main leakage sources in PWRs were summarized. Combining the technique features of visual inspection, the detecting principles were proposed. In the end, a protection strategy of boric acid corrosion was established including the control of borated water leakage, the detection of equipment, the treatment of leakages and the improvement of the equipment material.

Abstract: Possible chemical states of molybdenum in Mn-Zn ferrite at high temperatures were investigated by experiments and thermodynamic calculations. It is found that solid or liquid MnMoO₄(s,l) is the main Mo-containing phase during the sintering process of Mn-Zn ferrite up to about 1623 K, even if MoO₃ is employed as the additive. When temperature is higher than the melting point of MnMoO₄, Mo in Mn-Zn ferrite tends to evaporate in form of Mo₃O₉ (g) from thermodynamic point of view.

Abstract: 5-(4-nitrophenyl)-2-aminopyrazine (13) was synthesized from 2-aminopyrazine (9) through two steps including monobrominated reaction, Suzuki-Miyaura coupling and the structures were confirmed by ¹H NMR and MS spectrum. The synthetic method of 13 was optimized and can be used to synthesize 5-(4-nitrophenyl)-2-aminopyrazine derivatives.

Abstract: Mo behavior in Fe-rich Mn-Zn ferrites during sintering process was studied by adding MoO₃ or MnMoO₄ as additive. The influences of the additive amounts and treatment temperatures on microstructure, density, porosity as well as magnetic properties were investigated. It is found that formation of MnMoO₄ in the grain boundary plays an important role. Saturation flux density (Bs) at 373 K as high as about 513mT could be obtained when the equivalent Mo content is 133ppm. Based on the experimental results, a new hypothesis is proposed to explain why proper Mo addition is essential to obtain ferrites of good qualities.

Abstract: A rapid and sensitive ultra performance liquid chromatography (UPLC) method was developed to quantify the principle active components (o-chlorobenzamalononitrile, nonivamide, dihydrocapsaicin) in a variety of aerosol defense sparys obtained from independent distributors of the products. Chromatographic separation of the target ingredients was achieved using UPLC employing a reversed phase C18 column and a stepwise gradient of methanol and distilled water. Quantification of the analytes was achieved using ultraviolet detection at a wavelength of 229nm.The plot of concentration versus peak area was linear over the range of 1.0-100.0ug/ml with a correlation coefficient (r²)≥0.999 for each analyte. The accuracy of the assay ranged from 97% to 105% for all analytes and the quality control samples at 10, 50, 100ug/ml. The inter-assay and intra-assay precision of the method were achieved with a relative standard deviations lower than 3.6%. The results of the analysis demonstrate the degree of variability in the active ingredient content of the sprays.

Abstract: The wheat resistant starch type 3 (RS3) was prepared by the ultrasonic wave-enzyme method. The physicochemical and structure properties of the samples were studied. Results showed that: compared with native wheat starch, the granule structure of RS3 disappeared and the surfaces were awfully rough with obvious folds. Meanwhile the crystal structure appeared intensively showing irregular sheet shape. RS3 lost pasting properties of native starch and enhanced the resistance to enzyme attack. The crystallization structure of RS3 was a mixture of B–type and V–type.

Abstract: Geometric structure of Os_n (n=2-10) clusters are optimized by using Density functional theory (DFT) in DMOL3 package. For the ground-state structure, relative stability are analyzed. The results show that: the ground-state structures of the cluster are plane structure when n=2-4, but the ground-state structures are stereostructure when n≥5. There exhibits the odd-even oscillation effect in stability and Os₈ cluster has the highest stability.

Abstract: Effect of organic matter and organic acid on the heavy metals, especially, chromium (Cr) release in the sediment was researched. Glucose and soluble organic starch was used as organic matter, as well, citric acid and ethylene diamine tetraacetic acid (EDTA) were simulated as organic acid. The results showed that best adsorption time of glucose on Cr was 5h, the optimal dosage was 0.1g g^-1; best adsorption time of organic soluble starch was 4h, and the optimum adding amount of 0.08g/g; best adsorption time of citric acid was 5h, the best concentration 0.005mol g^-1; optimal adsorption time of organic acid EDTA was 3h, the optimum adding amount of 0.12g g^-1. Glucose, soluble starch and citric acid significantly effected on the release of Cr in the sediment, however, influence of EDTA on the release of Cr was not so evident.