Chemical Engineering and Material Properties III

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Authors: Xiao Juan Wei, Jian Ming Pan
Abstract: A novel method for the determination of ruthenium in waste ruthenium-loaded carbon catalyst samples was established by inductively coupled plasma optical emission spectrometry after samples digested by Teflon pressure digestion vessel with aqua regia. Such experiment conditions were investigated as the influence of sample dissolution methods, digestion time, digestion temperature and interfering ions on the determination. Under the optimized conditions, the limit of detection (LODs) of Ru for tested solution was 9 ng mL-1. The relative standard deviations (RSDs) for Ru was 2.12 % (CRu = 1 mg L-1, n = 7). The linear range of calibration graph for Ru and Zn was 0 ~ 100.00 mg L-1. The proposed method was applied to determine the practical samples with good recoveries and satisfactory results.
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Authors: Chun Jiang Wu, Chen Chen, Cheng Yu Sun, Fei Lei, Hai Hong Fang, Peng Wu Zheng, Rong Luo, Wu Fu Zhu
Abstract: A series of substituted ethyl argiosulfonylcarbamates were synthesized from substituted aromatics through three steps including chlorosulfonation, ammonolysis, nucleophilic addition and their structures were confirmed by 1H NMR and MS spectrum. The results showed that the yields of compounds were higher than 80%.
574
Authors: Chen Chen, Cheng Yu Sun, Shan Xu, Yuan Biao Tu, Peng Wu Zheng, Wu Fu Zhu
Abstract: A novel thieno [2,3-d] pyrimidine compound (1) bearing a sulfonylurea moiety was synthesized from methyl 2-aminothiophene-3-carboxylate (2) through five steps including cyclization, chlorination, substitution with morpholine and piperazine, amidation and its structure was confirmed by 1H NMR and MS spectrum. The total yield of the five steps was 16.2% ( calculated from methyl 2-aminothiophene-3-carboxylate).
577
Authors: Jin Fu Ba, Lu Cheng Zhan, Bo Zhang
Abstract: In order to find out the recharge source of the leakage water that appears behind the right dam of Suzhi hydroelectric station located in Qinghai province of China, water samples of the leakage water, groundwater in the seepage observation wells, reservoir water and local precipitation are taken for isotopic composition analysis. Stable isotopes of the leakage water behind the dam have significant differences with local precipitation, indicating that the leakage water should not be recharged by precipitation. Isotopes of water in the seepage observation wells and reservoir water scatter around the same evaporation line, which implies that well water comes from reservoir water recharge. Leakage water behind the dam probably originates from the leakage of reservoir water as the stable isotopes of leakage water approximate those of well water and reservoir water.
581
Authors: Shu Jun Zhang, Bing He, De Li Zhang
Abstract: The hydrodynamic cavitation degradation of chitosan with NaNO2 enhancement was investigated. The effects of NaNO2 dosage, temperature, inlet pressure, PH value, the concentration of the chitosan were been discussed. It was found that the hydrodynamic cavitation degradation of the chitosan can be largely enhanced by adding NaNO2. It was also seen that the extent of degradation chitosan can be changed marginally with the temperature.
585
Authors: Bing Qing Cao, Qi Bin Huang, Yong Pan, Mo Lin Qin
Abstract: This paper presents new effective approachs for the supermolecule film deposition of surface acoustic wave (SAW) chemical sensors for detecting DMMP. 25-(thioalkyl-alkoxy)-p-tertbutylcalix [4] arene self-assembly molecular imprinted film as the sensitive film was coated on the gold delay line of SAW sensors to detect DMMP. The sensor has special response to organoosphorus compounds and the respond characteristic property in different temperatures of SAW sensor was studied in detail, had important reference value in counter-terrorism.
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Authors: Bing Qing Cao, Qi Bin Huang, Yong Pan, Mo Lin Qin
Abstract: This paper presents a effective approach for one new supermolecule function materia preparation, 25-(thioalkyl-alkoxy)-p-tertbutylcalix [4] arene with self-assembled monolayers character was synthesized by two-step nucleophilic substitute reaction in NaH-THF phase with p-tertbutylcalix [4] arene and dibromodecne . The structure of product was characterized by FT-IR, 1H NMR, 13C NMR and MALDI-TOF-MS. The self-assembly molecular imprinted film as the sensitive film was coated on the gold delay line of SAW sensors to detect for detecting organophosphorus compounds such as sarin, had important reference value in counter-terrorism.
594
Authors: Han Yan, Pei Wang
Abstract: The first principles simulations are performed to investigate the adsorption and diffusion of aluminum, gallium and indium atoms on semi-polar gallium nitrides surface, the calculations are performed by using the Car–Parrinello molecular dynamics (CPMD) method. The aluminum ad-atoms adsorption in path 1 and path 3 are much stable than in path 2. The maximum adsorption energy of path1, path2 and path3 are different, which reveal that a different barrier energy pathway between indium ad-atom diffuse along path 1, path2 and path3. Our calculation results reveal that diffusion barriers of aluminum, gallium and indium atoms on semi-polar gallium nitride surface are anisotropy.
598
Authors: Hong Ying Zhang, Xue Ming Yan
Abstract: A new surfactant-type bifunctional thiourea organocatalysts were synthesized. In the presence of 10 mol% PhCOOH, the Michael reaction of nitroalkenes with various nucleophiles could be catalyzed smoothly by this new organocatalyst in water at room temperature, giving the desired adducts in good yields with high diastereoselectivities (syn/anti=82/18->99/1) and excellent enantioselectivities (up to 97% ee)
602
Authors: Yan Wang, Shi Wei Wu, Tian Le Li, Shen Shen Li, Zhong Qiu Cao
Abstract: Recently, Magnesium hydride MgH2 is one of the attractive hydrogen storage materials because it reaches a high hydrogen capacity. However, the reaction kinetics is too slow and needs high temperature for progressing hydrogen absorption and desorption reactions, which hinders the process of practical applications and it is necessary to improve the hydrogen storage propesties. In this paper, most used or under research methods (Doping with metal and compound) of improving on the hydrogen storage of magnesium hydride are reviewed, in particular to elements substitution, addition of transition metal oxides or fluorine and so on. The advantages and disadvantages of vaious methods of improving on the hydrogen storage of magnesium hydride are compared. The trend of the methods of improving is also introduced.
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