Frontiers of Materials, Chemical and Metallurgical Technologies

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Authors: Jing Xin Zhou, Ti Feng Jiao, Adan Li, Yuan Yuan Xing
Abstract: Functional luminol derivative with cholesteryl substituted group has been designed and synthesized from the reaction of the corresponding precursor cholesteryl chloroformate with luminol. This compound can be spread on water surface to form stable monolayer. It has been found that UV and IR spectra confirmed the characteristic aromatic segment, imide group and cholesteryl substituted group. In addition, the CD spectra also showed positive CD signals, which may be attributed to the chiral cholesteryl substituted groups. AFM investigation indicated some aggregated domains with the averaged height about 3.6  0.2 nm appeared. This suggested an organized structure of double molecules may be fabricated in the transferred LB films. The present results have demonstrated that the interfacial properties of luminol derivative can be modified by changing proper substituted groups of luminol, which show potential application in functional material fields such as ECL sensor.
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Authors: Zhong Nan Wang, Hong Zhong, Shuai Wang
Abstract: A novel pyridinedicanbnyl thiourea chelating resin(PTR) was synthesized from pyridinedicanbnyl diisothiocyanate and diethylene triarmine , its structure was confirmed by FT-IR. The adsorption properties of PTR for Ag(I) were investigated by batch operation . The results show that the adsorption equilibrium of PTR for Ag(I) is achieved after 14 hour at 25°C, the equilibrium adsorption capacity is 4.73mmol/g, the adsorption process accords with G. E. Boyd equation and Langmuir adsorption isotherm as well,and the silver-loaded resins can be quantitatively eluted by a solution containing 6% thiourea in 1mol/L HNO3.
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Authors: Dongoun Lee, Mohammed Nurunnabi, Joon Hwang, Eui Sik Chung, Mohammed Rahmatullah, Kang Moo Huh, Kwang Soo Kwak, Yong Kyu Lee
Abstract: Hyaluronic acid is a linear polysaccharide composed of glucuronic acid and N-acetylglucosamine. HA-based biomaterials secure wide-range applications in the healthcare industry. The material is found in cartilage, skin, umbilical cord, synovial fluid, as well as in the cell wall of bacteria such a Streptococcus zooepidemicus. As a consequence of these wide applications, HA production from microbial fermentation is receiving increased attention for avoiding the risk of cross-species viral infection, to have lower production cost and to favor a more efficient purification. The molecular weight is increased by adding poly-γ-glutamic acid, which inhibits hyaluronidase of medium, and the degree of purity is enhanced by a purification process using the means of dialysis membrane and organic solvent.
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Authors: Yin Zhi Jiang, Kuan Xiong, Yang Zou, Xiao Long Gao
Abstract: The title compound, 2-hydroxyand-4-methylthioxanthone(C14H10O2S)has been prepared from 2,2'-dithiosalicylic acid and 3-methylphenonl and characterized by IR and 1H NMR spectra. The yield was higher in the presence of P2O5.Its crystal structure was determined by single-crystal X-ray diffraction. Crystal data for the title compound: the triclinic system, space group P-1, with a = 7.4699(11)Å, b = 7.4839(11) (13)Å,c = 19.659(3) (11)Å,α=87.981(3) º,β= 85.678(3) º , γ= 82.618(3) º,Z=2,V= 1086.5(3) Å 3,Dc= 1.481mg.m-3,F(000)=504,µ= 0.281mm-1,R=0.0588 and wR= 0.1333.The results of crystal structure determination show that there exist intra-molecular hydrogen bonds, resulting in a framework of dimmers. C(1), C(2), C(3), C(4), C(5), C(6), C(7), C(8), C(9), C(10), C(11), C(12), C(13) and S(1) is coplanar in one molecular of the dimmer, and C(15), C(16), C(17), C(18), C(19), C(20), C(21), C(22), C(23), C(24), C(25), C(26),C(27) and S(2) is coplanar in the other molecular of the dimmer. The dihedral angle between the two molecular plans is 28.10(0.08), which shows that two molecular plans is not parallel in the framework of dimmers.
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Authors: Huo Ying Xu, Yin Zhi Jiang, Yang Zou, Lian Qun Zhang
Abstract: (R,R)-N,N’-di-(4-hydroxylbenzal)-1,2-cyclohexanediamine Schiff base(H2L) was synthesized and characterized by 1H NMR spectra, MS spectra and IR spectra. And the coordination reaction of H2L with chlorate of Cu(II) was studied. The reaction of H2L with CuII salt [CuCl2] generates a new compound, the title compound. The title compound was determined by IR spectra, elemental analysis and single-crystal X-ray diffraction. The title compound belongs to the monoclinic system, space group P2(1), with a = 6.6393(6)Å, b = 24.735(2)Å, c = 8.1128(7)Å, α=90.00 º, β=110.1670(10) º , γ=90.00 º, Z=2, V= 1250.60(19) Å3, Dc=1.382 mg.m-3, µ=1.020mm-1,F(000)=554, R=0.0351 and wR= 0.0887. There are five coordination sites around Cu2+ of the title compound, which are respectively occupied by one oxygen atom from one H2O molecule and four nitrogen atoms from two 1,2-cyclohexanediamine molecules. The Cu atom and four chelating nitrogen atoms are coplanar. There exist rich intra-molecular H-bond and intermolecular H-bond, which result in a three dimensional net.
193
Authors: Ling Mei Yang, Peng Mei Lv, Zhen Hong Yuan, Wen Luo, Hui Wen Li, Zhong Ming Wang, Chang Lin Miao
Abstract: Transesterification of soybean oil with methanol to methyl eaters was found proceed in the presence of KOH loaded on five different oxides (CaO, MgO, Al2O3, Bentonite, kaolin) as heterogeneous catalysts. The structure and performance of these catalysts were studied using the techniques of XRD, CO2-TPD, and SEM. It was found that the 15wt% KOH/CaO catalyst provided best activity. In the presence of this catalyst, the yield of fatty acid methyl esters was 97.1%. The reaction conditions were as follows: methanol to soybean oil molar ratio was 16:1, temperature of 65 °C, reaction time of 1 h, and a catalyst amount of 4 wt%. The catalysts of KOH loaded on CaO showed a new crystalline phase of K2O. However, the catalyst of 15-KOH/CaO has more basic sites than the catalyst of 15-KOH/MgO. Therefore, the catalyst of 15-KOH/CaO has been associated with higher transesterification activity.
197
Authors: Shao Peng Wang, Yu Fei Wang, Hui Na Wang, Jing Jing Li
Abstract: Phosphotungstic acid(abbreviated as PW12) supported on active carbon was used as catalyst of n-Amyl chloroacetate synthesis. Review the influence of various factors on esterification ratio, such as ratio of alcohol and acid, reaction temperature, the amount of catalyst and so on. The experiments indicated that the activity of PW12 supported on active carbon was better, the optimum reaction conditions were followings, loading of PW12 was 18%, ratio of alcohol and acid was 1.3:1, the percent of catalyst in reactants was 2.5%.
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Authors: Yan Li, Jian Zhao, Qing Yu, Zhong Wei Wang
Abstract: The antioxidant of tetrakis(2,4-di-tert-butylphenyl)-4,4’-biphenylenediphosphonate (TBBPP) was synthesized using biphenyl, PCl3, AlCl3, and 2,4-di-tert-butylphenol as raw materials. Phosphite esters were selected as the novel decomplex agent to isolate the intermediate of 4,4’-biphenylbisphosphorus dichloride complex from the complex it formed with AlCl3 during the reaction. The separate factors such as the mole ratio of the decomplex agent used, the decomplex temperature, and effect of decomplex agent were studied. The specifications of melting point, thermal stability and transmittance of the target compound synthesized were compared with the commercial product, and the results showed that the TBBPP synthesized in the study showed fairly better quality than the commercial one.
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Authors: Qing Kun Wang, Shao Ping Pu, Yong Nian Li, Jian He, Li Min Zhou, Ze Bing Zhu, Xue Jie Li, Quan Jin
Abstract: In order to obtain a gallic acid platinum complex, the title compound was synthesed from cis-[Pt(Cyclohexylamine)]2I2 by the reaction with NH3, silver nitrate and gallic acid respectively. The complex structure and component were characterized by elemental analysis, ESI-MS, 1H-NMR and IR and the anticancer activity was measured by MTT method. The result showed that its structure was consistent with the title compound and had inhibiting effect on the growth of tumor cell lines in vitro.
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Authors: Yong Hong Shui, Hong Yan Song, Xi Ling Feng, Qiao Qiao Li, Yue Jiang
Abstract: In order to improve the decolorization of dyeing wastewater, reduce the resources and energy consumption of the wastewater treatment process, Activated carbon from bean dregs (ACBD) was prepared the first time. The decolorizing effects of Methylene Blue on the activated carbon-microwave degradation were discussed. The decolorizing rate of dye-wastewaters respect on adsorbent time(t), adsorbent dosage(m) and pH value were investigated. And the conventional treatment results were compared. The results showed that microwave radiation could accelerate the adsorption of dye on carbon. Improve the decolorization rate and reduce the bleaching time. The decolorization rate reach to 98% after 10 seconds with 1.67g/L ACBD at pH=5.66 when 60mL for the 250mg/L dye wastewater. Compared with usual adsorption, conventional methods take 90min to reach the bleaching effect of microwave radiation just 10s under differently the quantity of ACBD. The decolorization time reduces greatly by microwave degradation.
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