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April 15,2013
Volume 6,Issue 7
Pages -
Subject Area:Chemical Separation Engineering,Basic Subject of Chemical Engineering,Chemical Thermodynamics,Bioinorganic Chemistry,Coordination Chemistry

Title: Preparation of antibacterial and hydrophilic membranes by long-distance and dynamic low-temperature plasma flow

Authors: ZHANG Yue, ZHAO Zhiping, LI Meisheng
PP: 690-696
Abstract: Polypropylene fibrous (PPF) membranes were grafted with methyl acryloyl oxygen ethyl benzyl dimethyl ammonium chloride (DMAE-BC) by long-distance and dynamic low-temperature plasma (LDDLTP) flow in order to achieve antibacterial properties. The PPF membranes were firstly treated by Ar LDDLTP flow and then grafted with DMAE-BC in aqueous solutions. Then, the function groups, element composition and morphology of the modified membranes were analysised by Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM), respectively, and the results showed that DMAE-BC was grafted with membrane successfully. Furthermore, plate counting method and absorption photometry were used to evaluate the sterilization and bacteriostatic properties of the membranes against Gram-negative Escherichia coli, respectively. The results indicated that the modified membranes had strong sterilization and bacteriostatic properties, and with the increasing of the grafting yield, the antibacterial property increased. In addition, the hydrophilicity and pure water flux of the modified membranes had a significant improvement. When the grafting yield was 4.04 mg/g, the contact angle decrease 35 and the pure water flux got to 4 400 kg/(m2穐) at a transmembrane pressure of 0.02 MPa.
Keywords: membrane separation; long-distance and dynamic low-temperature plasma flow; polypropylene fibrous membranes; antibacterial grafting; DMAE-BC

Title: Effect of microwave on vapor-liquid equilibrium and batch distillation for ethanol-benzene system

Authors: HOU Jun, XU Shimin, DING Hui, DING Zhiwei
PP: 684-689
Abstract: The microwave vapor-liquid equilibrium (VLE) apparatus was established by coupling the microwave generator and the modified Othmer still, and the microwave VLE data of ethanol-benzene system were determined at different microwave power (0, 50, 100, 200 W). The experiment results showed that microwave energy did not change the VLE of ethanol-benzene system. The apparatus of microwave batch distillation was also set up based on microwave VLE. Furthermore, the ethanol-benzene batch distillation experiment was performed with different initial mole fraction at the microwave power of 150 W. The experiment results showed that microwave energy did not change the mole fraction of tower distillate compared with the conventional condition, but improved the rate of tower distillate recovery. The operational time at microwave condition was about half of the time at conventional condition for obtaining the same tower distillate. The efficiency of batch distillation for ethanol-benzene system was improved markedly with the microwave.
Keywords: chemical separation engineering; microwave; vapor-liquid equilibrium; batch distillation; ethanol-benzene system

Title: Study on crystallization thermodynamics properties of picromerite

Authors: YUAN Junsheng, WANG Chengcheng, HAN Rongmin, JI Zhiyong, GUO Xiaofu
PP: 679-683
Abstract: In this paper, using wet slag method, the solubilities of picromerite in alcohol-water system with different proportion were determined. The supersolubility data of picromerite was also measured by means of conductivity method. Then, the crystallization metastable zone width of picromerite in water was obtained. At the same time, the influence of temperature, agitating rate and cooling rate on the metastable zone width was also studied. The results showed that the solubility of picromerite decreased with the increasing proportion of alcohol in the alcohol-water system. When the volume proportion of alcohol∶water was 1∶1, the solubility of picromerite nearly reached to zero. The metastable zone width of picromerite widened with the increase of cooling rate and the decrease of agitating rate, narrowed with the rising temperature. This study provided theoretical basis for the design of industrial crystallization device of picromerite, engineering expanding and industrial crystallization production.
Keywords: basic subject of chemical engineering; thermodynamics; crystallization; metastable zone; picromerite

Title: Study on phase equilibrum of ternary system Rb+, Mg2+∥borate-H2O at 348 K

Authors: ZHANG Yujuan, ZENG Ying, YU Xudong, JING Jing, WANG Chun
PP: 673-678
Abstract: The solubilities and physicochemical properties such as densities, refractive indices and pH values of the equilibrated solution in the ternary system Rb+, Mg2+∥borate-H2O were investigated at 348 K using an isothermal solution equilibrium method. On the basis of experimental data, the stable phase diagram and the physicochemical properties vs composition diagram of the ternary system at 348 K were plotted. In the phase diagram, there were one invariant point, two univariant curves, and two crystallization fields corresponding to single salts RbB5O8·4H2O and MgB4O7·9H2O. The results showed that the ternary system belonged to simple common saturation and there was no double salt or solid solution formation. Furthermore, the salt Rb2B4O7 had salting effect on the salt MgB4O7, while the salt MgB4O7 had salting out effect on the salt Rb2B4O7 with low concentration of MgB4O7 and salting effect on the salt Rb2B4O7 with high concentration of MgB4O7. Liquid phase physicochemical properties changed regularly with the increasing of Rb2B4O7 quality fraction. Density and refractive index increased on the univariant curve AE, while decreased firstly and then increased on the univariant curve BE with the concentration increasing of Rb2B4O7, and finally reached the maximum value at the invariant point E. However, pH value was negatively correlated with the concentration of Rb2B4O7 on the curvs AE and BE.
Keywords: chemical thermodynamics; phase equilibrium; isothermal solution equilibrium; salt-water system; borate; rubidium

Title: Oxidation kinetics of 1-(3,4-dimethoxyphenyl)ethanone by H2O2 with catalyzation of mononucleonic and binucleonic copper complexes

Authors: LI Xiaoli, CUI Gang, TANG Shaojian, PENG Yu, MENG Xiangguang
PP: 667-672
Abstract: Two mononucleonic copper complexes and one binucleonic copper complex were prepared. The oxidation kinetics of 1-(3,4-dimethoxyphenyl)ethanone catalyzed by three coper complexes in water solution were investigated, and the reaction rate constants were also obtained. The results showed that the mononucleonic complexes displayed good catalytic activity for 1-(3,4-dimethoxyphenyl)ethanone oxidation by H2O2 only at relatively high temperature, while the binucleoniccomplex could display good catalytic ability at ambient temperature. Furthermore, the catalytic activity of the complexes were correlated with pH of reaction solution, and it increased with increasing pH value within the experimental pH range. In addition, the proposed catalytic reaction mechanism explained the pH effect on catalytic activity of copper complexes. Therefore, the alkaline oxidative form of catalyst was belived as the real active species.
Keywords: physical chemistry; catalytic oxidation; lignin; 1-(3,4-dimethoxyphenyl)ethanone; hydrogen peroxide; kinetics

Title: Ru carbene complex catalyst adsorbed on magnetic porous core-shell composite (Fe3O4@mSiO2) for olefin metathesis

Authors: ZAHGN Wenjuan, YANG Hengquan, MA Zhancheng
PP: 661-666
Abstract: A new solid catalyst for olefin metathesis was developed through direct adsorption of the second generation Hoveyda-Grubbs catalyst on the magnetic porous composite (Fe3O4@mSiO2). The solid catalyst showed a high activity and excellent recyclability in olefin metathesis. After 5 recycles, this catalyst still maintained the activity of fresh catalyst. Impressively, the preparation of this catalyst was simple, and it could be effectively separated and recovered through a magnetic field.
Keywords: physical chemistry; magnetism; porous; olefin metathesis; solid catalyst; recycle

Title: Study on the design, synthesis and antitumor activity of novel bivalent β-carbolines

Authors: MA Qin, SHI Buxi, FAN Wenxi, GUO Liang, BAI Zhushuang, CAO Rihui
PP: 655-660
Abstract: Objective: To design novel bivalent β-carbolines and evaluate its antitumor activities. Methods: Six novel bivalent β-carbolines was synthesized from the starting material L-tryptophan by Spictet-Splengler condensation, esterification, oxidation and alkylation. The antitumor activities of all bivalent β-carbolines were evaluated in vitro through against a panel of human tumor cell lines and using the mothod of MTT. Results: The chemical structures of all the newly synthesized compounds were characterized by FAB-MS，1H NMR and 13C NMR. The experiment of in vitro antitumor activities demonstrated that compound 6c with a spacer of six methylene units exhibited the best antitumor activity, and all bivalent β-carbolines had selective antitumor activities against KB cell lines. Conclusion: These compounds might be a novel promising class of antitumor agents with clinical development potential.
Keywords: organic chemistry; synthesis; bivalent β-carbolines; antitumor

Title: Study on the synthesis of PLGA porous microspheres for bone regeneration

Authors: BIAN Chunhui, JIANG Pingping, LI Xiaofeng, LIN Huiming, QU Fengyu
PP: 651-654
Abstract: Poly (lactic-co-glycolic acid) (PLGA) porous microspheres were synthesized using emulsion method. Polyvinyl alcohol (PVA) and F127 were used as dispersing agent and porogen, respectively. The diameter of porous microsphere was about 20 μm. Scanning electron microscope (SEM) showed that the pore size of the macroporous of microsphere was about 2.0-2.5 μm. In vitro simulated body fluid test showed that the porous microspheres could induce the formation of hydroxyapatite on their surface. Therefore, the material may have potential application in tissue regeneration engineering.
Keywords: bio-inorganic chemistry; osteogenic; emulsion method; PLGA; porous microspheres

Title: Hydrogen peroxide promotes gadolinium-induced apoptosis of HepG2 cells

Authors: YE Lihua, LIU Huixue, WANG Kui, YANG Xiaoda
PP: 645-650
Abstract: The present work investigated the roles of H2O2 on gadolinium (GdCl3)-induced apoptosis of HepG2 cancer cell line. The experimental results revealed that H2O2 promoted gadolinium-induced HepG2 apoptosis significantly. Analysis of apoptotic relevant proteins with Western blotting indicated that incubation of cells with (Gd3+) and H2O2 resulted in significant cleavage of poly ADP-ribose polymerase (PARP) proteins, but caused much weaker effects on mitogen-activated protein kinases (MAPK) or mitochondrial apoptotic signal transduction. Meanwhile, combination of (Gd3+) with hydrogen peroxide could cause fragmentations of calf thymus DNA. All these results suggested that, instead of enhancing Gd-induced cellular signal, H2O2 promoted HepG2 apoptosis by increasing Gd-induced DNA damages. Therefore, this mechanism might provide a new insight for design and discovery of anticaner lanthanide compounds, further works on the chemistry and molecular biology mechanisms would be appropriate.
Keywords: bio-inorganic chemistry; GdCl3; H2O2; apoptosis; cancer; HepG2

Title: Synthesis and characterization of hureaulite at atmospheric pressure

Authors: YIN Hui, LIU Fan, FENG Xionghan, TAN Wenfeng, QIU Guohong
PP: 636-644
Abstract: Hureaulite was synthesized at different conditions, its crystal structure and micro-morphologies were characterized by powder X-ray diffraction (XRD), Rietveld structure refinement, Fourier transformed infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). The results showed that prismatic hureaulite was synthesized by refluxing of Mn(H2PO4)2 solution at atmospheric pressure under different temperatures (40-100℃). Needle-like hureaulite was also fabricated at only 100℃ when H3PO4 was added. Hureaulite was prepared by further adding NaClO solution into the reaction system. However, hureaulite did not form when Mn(H2PO4)2 was substituted by MnCl2 and H3PO4, but it could form by further adding NaClO solution in the reaction solution. A mixture of hureaulite and MnHPO4·3H2O was produced by refluxing Mn(H2PO4)2 at 40℃ for 12 h and 24 h. After reaction of 48 h, single phase hureaulite was formed. Most of the crystal parameters were closely similar when products were fabricated at different temperatures. However, the calculated densities of hureaulite increased with the increase of reflux temperature. That was to say, the density of hureaulite in supergene soil was lower than that of those formed by hydrothermal reactions, which facilitated to know the formation mechanism of hureaulite in environment. The results presented here indicated that the genetic mineralogy of hureaulite should be re-recognized. The new preparation method also facilitated the exploitation and application of hureaulite in the field of chemistry and materials science.
Keywords: inorganic synthesis chemistry; hureaulite; refluxing at atmospheric pressure; micromorphology; Rietveld structure refinement

Title: Synthesis and characterization of neodymium phosphite Nd2(H2O)(HPO3)3

Authors: ZHANG Dong
PP: 631-635
Abstract: The neodymium phosphite Nd2(H2O)(HPO3)3 was hydrothermally synthesized. Single crystal X-ray diffraction (XRD) analysis showed that Nd2(H2O)(HPO3)3 crystallized in monoclinic P2(1)/n with cell parameters a=0.958 35(5) nm, b=0.797 70(4) nm, c=1.307 09(6) nm, β=10.886 6(3)°, V=0.945 56(8) nm3, Z=4. In addition, the structural analysis indicated that this compound had the three-dimensional structure which consisted of a network of alternatively linked corner-sharing HPO3 and NdO8 polyhedra. The physical properties of this compound were also characterized by infrared spectroscopy, thermogravimetric and differential thermal analyses, and magnetics property measurement.
Keywords: inorganic chemistry; hydrothermal synthesis; phosphite; physical properties

Title: Synthesis and self-assembly of poly (ethylene glycol)/ poly (p-dioxane) amphiphilic block copolymers

Authors: WU Gang, LIU Changlei, CHEN Sichong, WANG Yuzhong
PP: 625-630
Abstract: Amphiphilic di-or tri-block copolymers were synthesized by bulk ring-opening polymerization of PDO using nomohydroxyl PEG or dihydroxyl PEG as macro-initiator, and Sn(Oct)2 as catalyst with different PEG molecuar weight and feed ratio. The structure of copolymers was characterized by nuclear magnetic resonance (NMR). Gel permeation chromatography (GPC) was used to determine molecular weight and molecular weight distribution of the copolymers. The self-assembling behavior of the copolymers were investigated by fluorescence probe method (FPM) and dynamic light scattering (DLS). The results of fluorescence spectrum (FS) showed that the copolymers could form nano/microparticle aggregates in aquesous solution, and the critical aggregation concentration (CAC) decreased with the hydrophobicity increasing of copolymers. In addition, the lower CAC indicated that the copolymers could self-assemble readily. The DLS results showed that when the molecular weight of PEG was stable, the particle size of copolymer increased with the increasing of PPDO molecular weight.
Keywords: polymer chemistry; block copolymer; amphiphilicity; self-assembly; poly(ethylene glycol); poly(p-dioxane)

Title: Design and application of fullerene-based liquid crystals

Authors: ZHANG Xiaoyan, GU Yan, YAN Honghong, ZHANG Pan, LI Chao, TU Yingfeng
PP: 616-624
Abstract: Fullerene-based liquid crystals are a new kind of materials with excellent electrochemical, photophysical properties of fullerenes and self-organization, processible properties of liquid crystals. The design of fullerene liquid crystals includes two ways: direct synthesis of molecular liquid crystals with the molecular aspect ratio larger than 4, and supramolecular liquid crystals with the molecular aspect ratio larger than 4 through self-assemble or self-organize of fullerene molecules. Functional groups such as ferrocene, dendron, chiral and phthalocyanine groups can be introduced into fullerene-based liquid crystals by careful molecular design, which expands the application field of fullerene-based liquid crystals.
Keywords: polymer chemistry; fullerene-based liquid crystals; review; self-organization; self-assembly

Title: Synthesis and structure characterization of 3D pillared {［Cu2(bpta)(4,4’-bipy)］·(H2O)3}n with metal-organic frameworks

Authors: LV Yingbin, ZHANG Dashuai, TIAN Dan, CHANG Ze
PP: 611-615
Abstract: With the ligands of H4bpta=1,1’-biphenyl-2,2’,6,6’-tetracarboxylic acid and 4,4’-bipy = 4,4’-bipyridine, a pillar-layer structure coordination compound of the formulas {［Cu2(bpta)(4,4’-bipy)］·(H2O)3}n was synthesized using hydrothermal method and Cu(NO3)2·3H2O reaction. Furthermore, its structure was characterized by infrared spectroscopy (IR), element analysis, thermalgravimetric analyses and X-ray single-crystal diffraction.
Keywords: coordination chemistry; coordination polymer; pillar-layer structure; hydrothermal synthese

Title: Recent progress in phthalocyanine dye application for dye-sensitized solar cells

Authors: YU Lijuan, LIN Li, LI Renjie, PENG Tianyou
PP: 605-610
Abstract: In this paper, the progress in the development of the research on “pull-push” structure of phthalocyanine dyes was reviewed. Then, this paper summarized the influences of the changes of“pull-push” groups on electron injection and electron transfer, the aggregation of phthalocyanine, the energy level of molecular orbital and the performance of the dye-sensitized solar cells (DSSCs). Good “pull” groups should contain electron-withdrawing groups or have strong interaction with TiO2. In order to improve dye solubility and reduce dye aggregation, the larger steric groups should be selected as “push” groups. Both of the interactions could be benefit to the excitation electron injection to the semiconductor and increased the photoelectric conversion efficiency.
Keywords: coordination chemistry; dye-sensitized solar cells; review; phthalocyanine; dyes

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