Chemical Journal of Chinese Universities
     Home |  About Journal |  Editorial Introduction |  Editorial Board |  Guide for author |  Index in |  Messages |  Contacts Us |                          中文
  Periodicals system
  Submission Online
  Manuscript Tracking
  Review Online
  Editor Office
  Online Read
  New Accept
  Online First
  Current Issue
  Next Issue
 Table of Contents
  Quick Search
    Writing Norms
    Contributions flow
2012 Vol.33 No.09
 Published: 10 September 2012

Reviews | Letter | Articles: Inorganic Chemistry | Analytical Chemistry | Organic Chemistry | Biological Chemistry | Physical Chemistry | Polymer Chemistry |
Select  |    Cite this article 
Qiang Yan
Study on Synthesis and Function of Stimuli-Responsive Polymer Systems
2012 Vol. 33 (09): 1877-1885 [Abstract] ( 5458 ) [HTML 0KB] [PDF 0KB] ( 1076 )    DOI:

Stimuli-responsive polymers is a class of macromolecular system with smart behavior. Their macromolecular structure and state can be great changed in response to external stimuli, such as pH, light, thermal, voltage, redox and gas. Then their physicochemical properties will be influenced and the functionality will be realized. Stimuli-responsive polymers have shown wide prospective applications in the fields of nanomaterials, life science, medical science and so on. This review introduces the synthesis, self-assembly, functionality and applications of stimuli-responsive macromolecular systems.

Select  |    Cite this article 

Inhibition Effect of NIR Photothermal Therapy Mediated by Gold Nanoflowers on Proliferation of Human Laryngocarcinoma Hep-2 Cells
2012 Vol. 33 (09): 1886-1888 [Abstract] ( 3527 ) [HTML 0KB] [PDF 0KB] ( 533 )    DOI:

Abstract Gold nanoflowers (GNFs)prepared by seeding approach in aqueous phase were identified to show high efficient photothermal conversion effect under irradiation of near-infrared laser. MTT results showed that the photothermal therapy mediated by GNFs could inhibite the proliferation of Hep-2 cells effectively, and the effect increased along with increasing concentrations of GNFs and power of the laser. It is expected that such GNFs prepared in aqueous phase are a kind of ideal materials for tumuor NIR photothermal therapy.

Articles: Inorganic Chemistry
Select  |    Cite this article 
Siru Chen Lijia Guo
Synthesis, Structure and Luminescence Properties on Two 3D Interpenetrating Metal-Organic Coordination Polymers of Mixed Ligands with Zn(II) and Cd(II)
2012 Vol. 33 (09): 1889-1894 [Abstract] ( 4382 ) [HTML 0KB] [PDF 0KB] ( 750 )    DOI:

Two new metal-organic coordination polymers [Zn(BPDC)(BPE) ? (DMF)2] (JUC-91) and [Cd(BPDC)(BPE) ? (DMF)2] (JUC-92) (BPDC = 4,4′-biphenyldicarboxylic acid, BPE = trans-bis(4-pyridyl)ethylene, DMF = N,N-dimethylformamide and JUC = Jilin University China) have been synthesized by self-assembly of mixed ligands and corresponding transition metal salts under mild conditions, and characterized by single-crystal X-ray diffraction, elements analysis, TGA, topology analysis, and PXRD. X-ray crystallography revealed that JUC-91 and JUC-92 exhibited three-dimensional structures with fivefold interpenetrating dia network and twofold interpenetrating primitive cubic network, respectively. In addition, luminescence properties of JUC-91 and JUC-92 have been characterized.

Select  |    Cite this article 

Synthesis of Titanate Self-Assembled Aggregates with Regular Structure
2012 Vol. 33 (09): 1895-1901 [Abstract] ( 4240 ) [HTML 0KB] [PDF 0KB] ( 475 )    DOI:

Bird's nest-like self-assembly titanate nanoribbon aggregates, fluff Sphere-like self-assembly titanate nanoribbon aggregates and urchin-like self-assembly titanate nanotube aggregates were prepared for the first time without template technique from Ti flake (or TiO2 powder) under hydrothermal conditions by adjusting NaOH concentration and cooling temperature. Cattail-like self-assembly titanate-sodium carbonate self-assembly complex aggregates were prepared for the first time with template technique using sodium carbonate. A possible two-stage growth mechanism involving the initial formation of primary 1D nanostructures that subsequently self-assemble was proposed. This research may provide new insight into the industrialized production of self-assembly titanate aggregates with complex morphology.

Select  |    Cite this article 
Yang Xuyu Xianbao Wang Li Jing Yang Jia Wan Li Wang Jingchao
Controllable Reduction of Graphene Oxides and Their Structural Characterizations
2012 Vol. 33 (09): 1902-1907 [Abstract] ( 5989 ) [HTML 0KB] [PDF 0KB] ( 3258 )    DOI:

To solve the insoluble and dispersive problem of graphene, it is a simple and effective method to control the reduced degree of graphene by changing the reduced conditions. Graphene with different reduction degree was prepared by the way of oxidation and reduction. The structures and properties of graphene were characterized systematically by Fourier transform infrared spectroscopy (FTIR), UV/vis spectra(UVS), Raman spectroscopy (RS), X-ray diffrations (XRD), thermo-gravimetric analysis (TGA) and electrical conductivity measurements. Moreover, transmission electron microscopy (TEM), scanning electron microscopy (SEM), atomic force microscopy (AFM) were employed to compare the morphologies of graphene oxide (GO) with those of graphene. The results showed that the oxygen-containing groups were removed gradually with the reduction, and the absorption peak of ultraviolet displayed a gradual red-shift. Besides, the ratio of the Raman intensities (ID/IG) of graphene is markedly increased, and the thermal stability is significantly improved. The characterization of microstructures reveals that graphene consists of thicker layer structures and more crumples than those of graphene oxide (GO).

Select  |    Cite this article 

High-temperature synthesis of magnetically active, stable and ordered mesoporous carbons with sulfonic groups
2012 Vol. 33 (09): 1908-1914 [Abstract] ( 4094 ) [HTML 0KB] [PDF 0KB] ( 725 )    DOI:

Abstract Ordered mesoporous silicas with extraordinarily ultra-low dielectric constants (k) were hydrothermally synthesized at temperatures (150-200 °C) via using soft-templates including amphiphilic triblock polymers of P123 (PEO20-PPO70-PEO20) and F127 (PEO106-PPO70-PEO106). Characterizations of XRD patterns and N2 isotherms show that these samples have ordered mesostructure, high BET surface area, large pore volume, and uniform pore size. 29Si MAS NMR spectra show that these samples have much higher silica condensation degree than the samples synthesized at relatively low temperatures. More importantly, these samples exhibit extraordinarily ultra-low dielectric constant (k). For example, ordered mesoporous silica of SBA-15 synthesized at 200 °C gives k value as low as 1.34, which is interpreted by a collaborative effect of large pore volume with high silica condensation degree. These samples with extraordinarily ultra-low dielectric constants would be potentially important for applications of superior insulators in electronic industry.

Select  |    Cite this article 

Preparation, Characterization and Gas Sensing Performance of Ag-supported Porous α-Fe2O3 Hybrid
2012 Vol. 33 (09): 1915-1919 [Abstract] ( 3558 ) [HTML 0KB] [PDF 0KB] ( 362 )    DOI:

Porous α-Fe2O3 was synthesized by a simple hydrothermal method of FeCl3 solution, followed by a calcination treatment, without templates or pore-directing agents. To obtain Ag-supported porous α-Fe2O3 hybrid, the as-prepared porous α-Fe2O3 was further employed as a support for loading Ag nanoparticles. The hybrid was characterized by XRD, TEM and XPS techniques and its gas sensing performance was investigated for several VOCs including methanol, ethanol, ether, acetone, butanol and hexanol at the operating temperature of 260 ℃. The results showed that the sensor presented a high sensitivity and fast response-recovery characteristic to these VOCs. Meanwhile, the sensor exhibited a much higher response than the pure α-Fe2O3 at the operating temperature of 260℃, which may be related to the unique porous structure of the Ag/α-Fe2O3 hybrid and the catalytic action of active Ag nanoparticles for the sensing reactions.

Select  |    Cite this article 

Light induced cellular cytotoxicity of rich arginine peptide modified ferric oxide core gold shell nanoparticle
2012 Vol. 33 (09): 1920-1925 [Abstract] ( 4078 ) [HTML 0KB] [PDF 0KB] ( 558 )    DOI:

Here, the laser induced cellular cytotoxicity of rich arginine peptide RRRRRRRR (R8) modified ferric oxide core gold shell nanoparticle(R8-Fe2O3@Au NP)has been studied. Although R8-Fe2O3@Au NP has a low cytotoxicity, the viability of nanoparticle internalized HeLa cell can be decreased by laser irradiation. The experimental result indicates that the R8-Fe2O3@Au NPs have significant cellular phototoxicity under laser irradiation. In addition, the cellular phototoxicity of R8-Fe2O3@Au NP is dependent on the wavelength of irradiation laser, and increased by the irradiating time and light intensity.

Analytical Chemistry
Select  |    Cite this article 

NaNO2 biosensor based on hollow nano-nickel oxide microsphere and ionic liquid composite film immobilizing hemoglobin
2012 Vol. 33 (09): 1926-1931 [Abstract] ( 3584 ) [HTML 0KB] [PDF 0KB] ( 590 )    DOI:

Hollow nano-nickel oxide microsphere (NiO) was fabricated by microwave hydrothermal process and characterized by SEM. The prepared NiO was used to immobilize hemoglobin (Hb) on the carbon paste electrode with 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4). The structure of Hb in the composite film was still maintained native-like demonstrated by FTIR spectra and UV-visible spectra. Moreover, the function of different component in the modified electrode was studied by electrochemical impedance spectroscopy. A pair of stable and quasi-reversible redox peaks was observed in phosphate buffer solution which indicating that heme-proteins could achieve its direct electron transfer effectively. The modified electrode displayed an excellent and rapid electrocatalytic response to the oxidation of NaNO2. The proposed biosensor exhibited a good linear response to the concentration of NaNO2 in the range from 10 to 170 μM, with a detection limit of 4.57 μM (S/N = 3). The apparent Michaelis-Menten constant was estimated to be 2.4 mM. Furthermore, the biosensor possesses satisfactory stability and good reproducibility.

Select  |    Cite this article 

Effect of Acarbose on Urine metabolic profiling of Type II Diabete Rats
2012 Vol. 33 (09): 1932-1937 [Abstract] ( 3970 ) [HTML 0KB] [PDF 0KB] ( 402 )    DOI:

An ultra performance liquid chromatography-mass spectrometry ( UPLC-MS) method was developed for the metabonomics study of effect of acarbose on type II diabete rats. Urine from three groups of rats were analyzed,including control group,model group and diabete rats treated with acarbose group,and the data were analyzed by the method of principal component analysis ( PCA) and partial least squares discriminant analysis (PLS-DA).The PCA score plots showed that the three groups were significantly different between the metabolic profile. According to the results of PLS-DA, the MS/MS data of each compound which provide greater contribution to separation of each group was searched from the Human Metabolome Database (HMDB) and Mass databases. 8 kinds of endogenous metabolites were identified as potential biomarkers such as gluconic acid, phenylacetylglycine, creatinine, etc.

Select  |    Cite this article 

Rapid Detection of Active Ingredients in Drugs by Microwave Plasma Atmospheric Pressure Desorption Ionization Mass Spectrometry
2012 Vol. 33 (09): 1938-1944 [Abstract] ( 4183 ) [HTML 0KB] [PDF 0KB] ( 740 )    DOI:

A new ionization source, termed microwave plasma atmospheric pressure desorption ionization (MWPADI) has been developed. The stable plasma was generated by microwave plasma torch working at 2450 MHz at atmospheric pressure. Ar was used as working gas. The source was successfully coupled with a Corsair API-TOF time of flight mass spectrometer, and the active ingredients in drugs were rapidly characterized. The speed was allowed as fast as approximate 360 samples per hour via manual sampling. In the microwave plasma environment, the hydrogen bound moiety of the active ingredients of the drug preparations was directly removed, as a result, the quasi-molecular ions of active component compounds [M+H]+ became the main ions and gave simple mass spectra. Without chemical reagents, MWPADI has the feature for direct analysis of samples with high throughput, no pollution and in real time. Therefore, the technique reported here is believed to be a useful technique for drug discovery and chemical industry.

Select  |    Cite this article 

Electrochemical detection of Klenow Fragment exo- activity based on gold nanoparticles amplification
2012 Vol. 33 (09): 1945-1949 [Abstract] ( 4002 ) [HTML 0KB] [PDF 0KB] ( 688 )    DOI:

A label-free, simple and fast electrochemical method for Klenow Fragment exo- (KF-) detection has been developed based on the properties of gold nanoparticles (AuNPs) such as the large specific surface, small size and the ability of binding much DNA. In the method, thiolated primer DNA was first modified on the surface of electrode. In the presence of template DNA and reporter DNA tethered with AuNPs (AuNPs-DNA), primer DNA and report DNA were hybridized with template DNA to form a sandwich hybridization mode, which brings the AuNPs–DNA to the electrode surface. When put the modified electrode into the electrolyte containing [Ru (NH3)6]3+ (RuHex), the RuHex quantitatively binds to the DNA via electrostatic interaction. Since AuNPs is loaded with much reporter DNA that can bind a large number of RuHex, this offers the electrochemical signals amplification for the detection. In the presence of dNTPs and KF-, the extension reaction was triggered, which results in the dissociation of the AuNPs–DNA and release of abundant RuHex molecules. As a result, the electrochemical signal was reduced and the KF- was detected. Using this method, a detection limit as low as 5 U/mL for KF- was achieved.

Select  |    Cite this article 

Temperature-induced Structural Changes of ovomucin as determined by FT-IR and 2D IR Correlation Spectroscopy
2012 Vol. 33 (09): 1950-1956 [Abstract] ( 3682 ) [HTML 0KB] [PDF 0KB] ( 687 )    DOI:

Fourier transform infrared (FT-IR) spectroscopy combined with 2D correlation spectroscopy was used to determine the stability and structure of ovomucin induced by temperature. Results indicated that the peak position and intensity in infrared spectra of ovomucin changed greatly basically between 55 and 65 ℃. Two-dimensional correlation analysis further showed that the sugar chain in ovomucin is more sensitive to temperature changes and it was more likely to change prior to peptide during the heat treatment. The presence of sugar chain in ovomucin molecules was helpful to maintain the stability of protein conformation. The order of the secondary structure changes in ovomucin induced by temperature was α-helix, β-sheet, β-turn, random coil. These results provided preliminary information about the mechanism of ovomucin conformational changes as induced by variable temperature perturbation.

Select  |    Cite this article 

Direct determination of lead and cadmium in distilled spirits by inductively coupled plasma mass spectrometry coupled with chip-based microflow injection system
2012 Vol. 33 (09): 1957-1963 [Abstract] ( 3746 ) [HTML 0KB] [PDF 0KB] ( 253 )    DOI:

A microfluidic chip for introducing variable-volume sample was fabricated. Combined with the 8 -way multifunctional valve, the introduction of sub-microlitre sample in inductively coupled plasma mass spectrometry (ICP-MS) was realized. 50 % ethanol was used to simulate the distilled spirit. The effects of the volume of the 52 % ethanol introduced into ICP-MS on ICP stability and the spectral interference from the spirit matrix were studied. The relationship between the sampling volume and sensitivity was evaluated. The carrier flow rate was optimized. The experimental results showed that neither alteration of plasma stability nor carbon deposition was observed when the sampling volume of 50 % ethanol reduced down to 0.8 μL. Further reducing the sampling volume to 0.3 μL, the interference from carbon was eliminated. Based on these observations, a microflow injection method for the determination of lead and cadmium in distilled spirits by ICP-MS using external aqueous calibration was developed. The sample throughput was 45 h-1 with the detection limit of 12 and 42 ng/L for Pb and Cd. The contents of Cd and Pb in six distilled spirits were measured. The results agreed well with those determined by ICP-MS with the conventional sampling system after microwave assisted digestion.

Select  |    Cite this article 

Study on the Chemical Reaction Using FT-mid-IR Fiber Optics Technique
2012 Vol. 33 (09): 1964-1968 [Abstract] ( 3578 ) [HTML 0KB] [PDF 0KB] ( 350 )    DOI:

Fourier transform infrared (FTIR) spectroscopy is sensitive probe of molecular structure which can provide significant information on the structure and composition of unknown substances and confirm the presence of some chemical groups. IR fiber optics possesses high performance which can be applied to transmission of IR light. The coupled technique of FTIR and mid-IR fiber optics can simplify the sample preparation in traditional IR spectroscopy. Formation of new compound is observed in situ and reaction process can be monitored on line using FTIR fiber optics technique. In our study, mid-IR fiber optics technique is applied to liquid phase systems and solid/liquid reaction systems. In the liquid phase system, we investigate the saponification reaction of naphthenic acid-octal alcohol-heptane and study the formation mechanism of w/o microemulsion during the saponification of NA-ROH-heptane system. The interaction between naphthenic acid and octal alcohol was observed. With adding ammonium hydroxide, the ~1708cm-1 peak disappeared and the 1548cm-1 peak enhanced and the peak position of water emerged and shifted to 1637cm-1 from 1642cm-1 which is the position of water molecule in IR spectroscopy. It showed that water is constrained in aqueous droplet of naphthenic acid-octal alcohol-heptane and microemulsion is formed through the saponification. In the solid/liquid reaction system, complexation reaction between o-phthalic acid and Europium Chloride is investigated. The interaction between o-phthalic acid and EuCl3 in neural medium was ignored in previous study. But this weak interaction was observed using FTIR fiber optics technique in our present investigation. The results showed that the component and structure of the final complex were effect by the difference of adding sequence. It is, therefore possible, that the FTIR fiber optics technique may become a new method of monitoring chemical reaction in real time.

Organic Chemistry
Select  |    Cite this article 

Odorless and efficient Thioacetalization Reaction of Oximes
2012 Vol. 33 (09): 1969-1972 [Abstract] ( 3459 ) [HTML 0KB] [PDF 0KB] ( 520 )    DOI:

Using odorless and stable a-oxo ketene dithioacetals 1 as thiol equivalents, the thioacetalization reaction of oximes 5 were studied. In the reaction system of MeCOCl-EtOH(95%) or 4-dodecylbenzenesulfonic acid (DBSA)-H2O, the thioacetalization reaction were successfully carried out in reflux temperature. It is noteworthy that the odor of thiols can not be perceived during both the reaction and workup.

Select  |    Cite this article 

Concentration responsible interaction of cucurbit[6]uril with 2, 2’ -(octane -1, 8-diyl)dibenzimidazolium dichloride
2012 Vol. 33 (09): 1973-1977 [Abstract] ( 4123 ) [HTML 0KB] [PDF 0KB] ( 444 )    DOI:

The self-assemblied binding models of cucurbit[6]uril with 2, 2’ - (octane -1, 8 - diyl) dibenzimidazolium dichloride was investigated by means of 1H NMR, Fluorescence emission, and UV-vis spectrum. The experiment results reveal that the host Q[6] prefers to includes the aromatic benzoimidazolyl moieties of the protonated SBO at a lower ratio of NQ[6]/Nguest low less than 1 in water medium, At higher ratios of Q[6] to guest or in water medium, a chain shape guest could be borne two Q[6] molecules and form a dumbbell shape inclusion complex.

Select  |    Cite this article 

The first total syntheses of 5, 7-dihydroxy-3-isopentenylflavone and 5-hydroxy-3-isopentenylflavone natural compounds
2012 Vol. 33 (09): 1978-1983 [Abstract] ( 4065 ) [HTML 0KB] [PDF 0KB] ( 446 )    DOI:

The 5, 7-dihydroxy-3-isopentenylflavone (1a)and 5-hydroxy-3-isopentenylflavone(1b) are natural compounds with anticancer, antioxidant, anti-aging and antibacterial effects. Their first total syntheses are achieved (1a,80.6% and 1b,84.9%)through selective protection of phenolic hydroxyl groups, acylation, Bake-Venkataraman rearrangement, prenylation, cyclization and demethylation, which starts from 2, 4, 6-trihydroxyacetophenone and 2, 6-dihydroxyacetophenone, respectively. The structures of all the compounds are characterized by 1H NMR and 13C NMR. Results show that the synthetic routes is simple, efficient, and the biological activities are 5, 7-dihydroxy-3-isopentenylflavone(1a)> 5-hydroxy-3-isopentenylflavone(1b)by the density functional theory (DFT) calculations. The results in the present work might reveal potential applicability in the total syntheses of other 3-alkylfavones natural compounds and lay a good foundation on studying the structure–activity relationship of 3-alkylfavones.

Select  |    Cite this article 

Synthesis and Characterization of Novel Layered Crystalline Organic Polymer–Inorganic Hybrid Materials Zinc Poly(Styrene-Phenylvinyl Phosphonate) -Phosphate Ammonium
2012 Vol. 33 (09): 1984-1990 [Abstract] ( 3735 ) [HTML 0KB] [PDF 0KB] ( 499 )    DOI:

A series of organic polymer-inorganic hybrid materials zinc poly (styrene-phenylvinylphosphonate)-phosphate ammonium(ZnPS-PVPPA), were prepared with mild and facile conditions from the copolymer of styrene-phenylvinylphosphonic acid with zinc acetate dihydrate and ammonium dihydrogen phosphate treated with different ratios of inorganic phosphate to organic phosphonate. The ZnPS-PVPPA were characterized by FT-IR, TG, XRD, SEM, TEM and solid UV-Vis and the tests of the catalytic ability were also carried out. It could be deduced that compounds were novel types of layered crystalline organic polymer-inorganic hybrid materials and possessed high thermal stability and porous structure. ZnPS-PVPPA could have potential applications for heterogeneous catalyst supports.

Select  |    Cite this article 

Effect of Cu2+ on Fluorescent Properties of Biphenyl-4-carbaldehyde modified polyamidoamine dendrimers
2012 Vol. 33 (09): 1991-1994 [Abstract] ( 3374 ) [HTML 0KB] [PDF 0KB] ( 353 )    DOI:

The polyamidoamine(PAMAM) dendrimers from generation one to three were modified with Biphenyl-4-carbaldehyde, respectively. These PAMAM-BPA dendrimers were characterized by using various spectroscopic methods. The effect of Cu2+ on the fluorescent spectra of these dendrimers was studied. The results indicated that because the dendrimer effect existed, in proper concentration ranges, Cu2+ which usually as the fluorescent quenching agent can enhance the fluorescence of dendrimer G1-BPA4 and dendrimer G2-BPA8 and quench the fluorescence of dendrimer G3-BPA16. Among these dendrimers, the dendrimer G1-BPA4 is especially promising to be the dendrimer-copper hybrid materials and the fluorescence probe of Cu2+.

Select  |    Cite this article 

The Monobromination of Aromatic Compounds Catalyzed by Iodine or Ammonium Iodide
2012 Vol. 33 (09): 1995-1999 [Abstract] ( 3669 ) [HTML 0KB] [PDF 0KB] ( 470 )    DOI:

An efficient monobromination of electron-rich aromatic compounds catalyzed by iodine or ammonium iodide is reported. A catalytic amount of molecular iodine or ammonium iodide reacts with benzene and m-chloroperbenzoic acid in the presence of p-toluenesulfonic acid to form the recyclable hypervalent iodine intermediate, with which the bromination of electron-rich aromatic compounds and potassium bromide is fast in THF at room temperature, providing regioselective monobrominated products in good yields.

Biological Chemistry
Select  |    Cite this article 

Study on Chemical Composition and Bioactivity of Polypeptide from Velvet Antlers of Cervus nippon Temminck
2012 Vol. 33 (09): 2000-2004 [Abstract] ( 3878 ) [HTML 0KB] [PDF 0KB] ( 803 )    DOI:

The velvet antler polypeptide was extracted and purified by ion exchange chromatography, gel filtration and RP-HPLC, which showed a single peak in HPLC chromatography and a single band in SDS-PAGE. The molecular weight measured by MALDI-TOF-MS. This polypeptide consists of a single chain of 32 amino-acid residues VLSAT DKTNV LAAWG KVGGN APAFG AEALE RM. The experiment results of bioactivity show that the polypeptide has stimulant effects on the growth of rat epithelial cells, rabbit costal chondrocytes and rat NIH3T3 cell line respectively in vitro.

Physical Chemistry
Select  |    Cite this article 

Effect of Polyacrylic Acid on the Adsorption of Cd onto Natural Biofilms
2012 Vol. 33 (09): 2005-2012 [Abstract] ( 3979 ) [HTML 1KB] [PDF 480KB] ( 730 )    DOI:

Dissolved natural organic matters (DNOM) usually have significant effects on the behavior of trace metals in aquatic environment. As an important solid materials existing wildly in natural waters, natural biofilms also affect the behavior of trace metals remarkably, by the action of adsorption. In this study, PAA (polyacrylic acid) was selected as a surrogate for macromolecular DNOM to investigate the effect of DNOM on the adsorption of Cd by natural biofilms. Cd adsorption to natural biofilms without PAA and with the presence of different concentrations of PAA was carried out. The influences of solution pH and component addition sequence on the effect of PAA were also measured. The presence of PAA generally decreased the adsorption of Cd, and the effect was influenced by the concentration of PAA, the solution pH, the adsorption sequence and the thickness of the biofilms. Higher concentration ratio of PAA to Cd or higher pH usually resulted in more significant decreasing effect on adsorption. The influence of adsorption sequence on the effect of PAA was insignificant in lower pH range, while in higher pH range, the decreasing effect of PAA on adsorption was more considerable for simultaneous adsorption and PAA first adsorption, than for Cd first adsorption. As to thickness of biofilms, the effect of PAA was usually significant for thinner biofilms. The role of PAA on adsorption could be attributed to the competition between PAA and the biofilms for available Cd, and to the formation and adsorption of ternary surface complexes. Higher pH facilitated the complexation between PAA and Cd, and impeded the adsorption of negatively charged complexes on the biofilms.

Select  |    Cite this article 

Adsorption Behavior of Hydrophobin Proteins on the Surface of Single-Walled Carbon Nanotubes
2012 Vol. 33 (09): 2013-2018 [Abstract] ( 4365 ) [HTML 0KB] [PDF 0KB] ( 842 )    DOI:

Atomistic molecular dynamics simulations have been conducted to elucidate the adsorption mechanism of hydrophobin proteins on the surface of single-walled carbon nanotubes, and the binding free energy has been calculated. The present results reveal that the adsorption mode, where the adsorption sites fully come from the hydrophobic patch of the protein, is the most energetically favored. Furthermore, the main secondary structures of protein are preserved in the entire course of adsorption due to four disulfide bonds.

Select  |    Cite this article 
Preparation, Characterization of Hydrophobic Spherical CaCO3 Particles and Influence on the Properties in PP
2012 Vol. 33 (09): 2019-2024 [Abstract] ( 3780 ) [HTML 0KB] [PDF 0KB] ( 570 )    DOI:

In the work, hydrophobic spherical CaCO3 particles with good monodisperse were prepared by carbonation of in the presence of dodecyl dihydrogen phosphate (DDP). The surface property of CaCO3 particles was transformed from hydrophilic to hydrophobic when the dosage of DDP to CaCO3 changed from 0 to 2 %. X- ray diffraction (XRD) patterns showed the spherical aragonite CaCO3 particles were obtained in the reaction. FT-IR spectrums indicated the existence of the alkyl groups from the DDP in the products. The active ratio reached to 99 % and the contact angle of modified CaCO3 particles was 120.43o. Simultaneously the effects of the reaction temperature and the dosage of DDP on the morphology and behaviors of aragonite crystals were discussed. The schematic illustration for interaction was showed in the end. The CaCO3 had been used in PP. The mechanical properties and processabilities of the PP have been tested.

Select  |    Cite this article 

Preparation of Carbon Supported PdPb Catalysts and Its Electrocatalytic Performance in Oxidation of Formic Acid
2012 Vol. 33 (09): 2025-2029 [Abstract] ( 8578 ) [HTML 0KB] [PDF 0KB] ( 651 )    DOI:

The carbon supported PdPb catalysts with different Pd : Pb weight ratios are prepared in the aqueous solution by a chemical reduction method. The studies show that the PdPb/C catalysts can promote the activity for formic acid electrooxidation and change the reaction mechanism. As the catalysts with small ratio of Pb, it can enhance the dispersion of active component and largely enhance the catalytic activity of formic acid electrooxidation. When the weight ratio of Pd:Pb is 8:1, the catalyst shows the highest catalytic activity for formic acid oxidation, and the peak current density increases 180% compared to that on Pd/C. When the weight ratio of Pd:Pb is 2:1, the catalyst shows the best behavior of stability.

Select  |    Cite this article 

Effects of stoichiometry and dehydrogenation back-pressure on the dehydrogenation behavior of LiBH4 + xMg2NiH4 composites
2012 Vol. 33 (09): 2030-2034 [Abstract] ( 3688 ) [HTML 0KB] [PDF 0KB] ( 422 )    DOI:

LiBH4/Mg2NiH4 system is an attractive reversible hydrogen storage system. The effects of stoichiometry (x=0.25, 0.5, 0.75, 1.0, 1.25) and hydrogen back pressure on the dehydrogenation behavior of LiBH4 + xMg2NiH4 composites have been investigated systematically by methods of X Ray diffraction (XRD) and Temperature programmed desorption (TPD) analysis in this paper. The results show that the stoichiometry x has a great effect on the dehydriding kinetics of LiBH4 + xMg2NiH4 composites. With the increase of x value for the LiBH4 + xMg2NiH4 composites, the decrease of the dehydrogenation temperature and the improvement of the dehydriding kinetics are observed but with a loss of dehydrogenation capacity. Thereinto, LiBH4 + 0.75Mg2NiH4 composite has the best dehydriding kinetics and a relatively high hydrogen storage capacity under initial hydrogen back pressure of 0.001 bar or 4 bar. The analysis shows that both the stoichiometry x of the LiBH4/xMg2NiH4 mixtures and hydrogen back pressure can influence the wetting between liquid LiBH4 and solid Mg2NiH4, and have a great effect on the dehydrogenation path and kinetics furthermore.

Select  |    Cite this article 

Influence of Magnesium Content on Structure and Performance of A2B7-type R-Mg-Ni Hydrogen Storage Alloys
2012 Vol. 33 (09): 2035-2042 [Abstract] ( 3985 ) [HTML 0KB] [PDF 0KB] ( 354 )    DOI:

La0.8-xGd0.2MgxNi3.1Co0.3Al0.1 (x=0.0, 0.1, 0.15, 0.2, 0.25, 0.3, 0.4) alloys were prepared by induction melting followed by annealing treatment at 1173K for 8 hours in Ar atmosphere. Phase structure analyses showed that the influence of Mg content in alloys on the alloy composition and phase structure was great. The main phase was the Ce2Ni7-type phase and the phase abundance of Ce2Ni7- and Gd2Co7-type was 98.8% at the lower Mg content. When x≥0.25, the alloys were mainly composed of A2B7-type, CaCu5-type and PuNi3-type structure. The phase abundance of the PuNi3- and CaCu5-type phase increased with the high content of Mg. The unit cell parameters of main phases decreased and hydrogen absorption plateau rised with the increasing content of Mg. Electrochemical measurements showed that as the Mg content increased, the discharge capacity and cyclic stability of alloy electrodes both first increased and then decreased. La0.65Gd0.2Mg0.15Ni3.1Co0.3Al0.1 alloy electrode exhibited the maximum electrochemical discharge capacity (393 mAh?g-1) and the best cyclic stability (S100=92.82%). The high rate dischargeability first decreased then increased and final decreased. The appropriate Mg content improved electrochemical kinetics property of alloy electrodes.

Select  |    Cite this article 

Theoretical study on the basicity of the boron-substituted zeolite interacted by NH3
2012 Vol. 33 (09): 2043-2046 [Abstract] ( 3397 ) [HTML 0KB] [PDF 0KB] ( 245 )    DOI:

In this article, the basicity of boron-substituted zeolite interacted by NH3 is studied by theoretical calculations using DFT method at the B3LYP/6-311++G(d,p) level. We find that the B-NH2 group itself does not have high basicity, however, when the proton or Lewis acid is adsorbed to it, the coexisting Si-OH group contributes to the basicity by forming a hydrogen bond with B-NH2. Besides, the Si-NH2 group and the coexisting B-OH group cooperatively have rather high basicity. Thus, the boron-substituted zeolite interacted by NH3, which contains the B-NH2 together with B-OH groups and the Si-NH2 together with B-OH groups, could be a kind of promising basic materials.

Select  |    Cite this article 

Investigation on the Eletrodeposition of Cu in Ionic Liquid and SERS Properties
2012 Vol. 33 (09): 2047-2050 [Abstract] ( 3818 ) [HTML 0KB] [PDF 0KB] ( 529 )    DOI:

The electrodeposition of Cu was investigated in 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]BF4) ionic liquid on ITO substrates by cyclic voltammetric method. The XRD, SEM and Raman spectroscopy were employed to characterize the composition, surface morphology and the surface enhanced optical properties of the deposited layers. The results indicated that Cu2+ underwent two one-electron reduction processes, involving the transform to Cu+ and the deposition of Cu. The composition and morphology of deposition layer was dependent on the electrodeposition potentials. The mixture of Cu and Cu2O was obtained at relative positive potential, while pure Cu layer at extremely negative potentials. With negative movement of applied potentials, the surface layer became more compact and the morphology underwent from flower-like, rod-like to nanospherical particles, and the appropriate SERS activities for pyridine and catalytic activities in the reduction of p-nitrophenol to p-aminophenol in the presence of NaBH4 increased.

Select  |    Cite this article 

The mechanisms of electron transfer and dynamical process at the multiphase interface in dye sensitized solar cell
2012 Vol. 33 (09): 2051-2055 [Abstract] ( 3683 ) [HTML 0KB] [PDF 0KB] ( 580 )    DOI:

The multiphase complex interface made up of the transparent conductive oxide substrate (TCO) nano-porous TiO2 film and electrolyte will form at the substrate of the anode in dye sensitized solar cell (DSC). The mechanisms of electron transfer and dynamical process at this multiphase complex interface were investigated by electrochemical impedance spectroscopy (EIS). The multiphase interface structure was simplified by an insulating layer which electropolymerized on the exposed TCO. According to changes of the contact interface structure and electron transfer pathway, the corresponding equivalent circuits were constructed. The interface electron transfer mechanism was analyzed and the electron transfer kinetic constants for the electron transfer across the main contact interfacial were obtained at different bias. The results show that different mechanism of interfacial electron transfer and kinetics process can be distinguished by adjusting the bias and simplifying the multiphase interface structure.

Select  |    Cite this article 

Synthesis and Photo-electricity Properties of Hydroxyphenyl-pyrimidine Beryllium(II) Complex
2012 Vol. 33 (09): 2056-2060 [Abstract] ( 3465 ) [HTML 0KB] [PDF 0KB] ( 475 )    DOI:

A novel chelating ligand, 2-hydroxyphenyl-pyrimidine(HPP), has been designed and synthesized through Suzuki coupling reaction. Its beryllium complex bis[2-(2-hydroxyphenyl)-pyrimidinato]beryllium(Be(PP)2) was also prepared in high yields and characterized by IR, 1H NMR. Upon photoexcitation, the complex displayed intense blue emission (λmax = 460 nm) in methanol solvent at room temperature. In addition, a white organic electroluminescent device was fabricated by vacuum thermal evaporation with a double-layer structure of ITO/NPB(45 nm)/Be(PP)2(60 nm)/Al(300 nm) using the Be(PP)2 as emitting and electro-transporting material. The non-doping device showed a lower turn-on voltage of 4 V, a maximum brightness of 103 cd/m2, a CIE color coordinates of (0.37, 0.39) and .maximum luminous efficiency 0.13 lm/W.

Select  |    Cite this article 

Preparation of Pt-S2O82-/ZrO2-Al2O3 Catalyst by Microemulsion Method and Its Performance for Isomerization
2012 Vol. 33 (09): 2061-2066 [Abstract] ( 3791 ) [HTML 0KB] [PDF 0KB] ( 354 )    DOI:

Pt-S2O82-/ZrO2-Al2O3(Pt-SZA-M) solid superacid catalyst was prepared by microemulsion method for the first time. The isomerization performance of catalysts prepared with the microemulsion method and dipping method was compared by using n-pentane isomerization as a probe reaction. The catalysts were characterized by XRD, FT-IR, BET, TG, TPR and TEM. The results show that compared with the Pt-SZA catalyst, the Pt particles on Pt-SZA-M are smaller (4.5nm) and more uniform size; the specific surface area of Pt-SZA-M is 109.6 m2g-1 which is 15.4 % higher than that of Pt-SZA(95.0 m2g-1). The initial reduction temperature of Pt-SZA-M is decreased by 10-20℃ compared with the Pt-SZA, which indicates that loading Pt by microemulsion method can improve the oxidative activity of catalyst and enhance the dissociation adsorption ability of H2 on the surface of catalyst. The activity test of isomerization performance indicates that compared to the Pt-SZA, the activity of isomerization of the Pt-SZA-M under low temperature is significant improved, at reaction temperature of 230 ℃,pressure of 2.0 MPa, hydrogen/hydrocarbon molar ratio of 4:1 and hourly mass space velocity(MHSV) of 1.0 h-1, the isopentane yield is 60.8 %.

Select  |    Cite this article 

Influence of Mo Content on Microstructure and Catalytic Performance of Ni-Mo-B Amorphous Alloy Catalyst for Dinitrotoluene Hydrogenation
2012 Vol. 33 (09): 2067-2073 [Abstract] ( 3721 ) [HTML 1KB] [PDF 0KB] ( 334 )    DOI:

Abstract: A series of amorphous Ni-Mo-B catalyst was prepared by KBH4 reduction for liquid phase dinitrotoluene hydrogenation. The results showed that Ni-B catalyst exhibited high activity and selectivity in liquid phase hydrogenation of dinitrotoluene(DNT) to diaminotoluene(TDA), the activity of Ni-B catalyst has been enhanced obviously by introduction of Mo, and the selectivity of TDA was 100% when the content of Mo was smaller and equal to 6 mol%. The characterizations of XRD, DSC, TEM, XPS and H2-TPD showed that the addition of Mo could enhance the extent of long-range disordered, reduce the particle diameter from 60 nm to 15 nm, weaken the strength of Ni-H bond, improve the thermal stability and antioxidation, which resulted in the increasing activity of Ni-B. when Mo content was 0.6 mol%, the conversion of the DNT and the selectivity of TDA reach 99.8 and 100%, respectively.

Select  |    Cite this article 
Wen-Wen Zhong Ming-Zhe Di You-Ying Di
Synthesis, Structure Characterization and Thermochemistry of Pyridine 2,6 - dicarboxylic acid potassium hydrogen
2012 Vol. 33 (09): 2074-2079 [Abstract] ( 3192 ) [HTML 0KB] [PDF 0KB] ( 551 )    DOI:

Pyridine 2,6-dicarboxylic acid potassium hydrogen (KHDPC) was synthesized. Crystal structure of the compound was determined by X-ray crystallography. Low-temperature heat capacities of the compound were measured with an automated adiabatic calorimeter over the temperature range from 78 K to 360 K. Experimental heat capacities were fitted by least-squares method and a polynomial equation of heat capacities vs. reduced temperature was obtained. The smoothed molar heat capacities and thermodynamic functions of the compound relative to the standard reference temperature 298.15 K were calculated based on the fitted polynomial equation. A reasonable thermochemical cycle was designed on the basis of the preparation reaction of the substance, and standard molar enthalpies of dissolution for the reactants and products of the hydrothermal reaction in the selected solvents were measured by an isoperibol solution-reaction calorimeter, respectively. Eventually, standard molar enthalpy of formation of the compound was derived to be - (1052.69 ± 1.52) kJ?mol-1 by Hess thermochemical cycle.

Select  |    Cite this article 

Fabrication of the Photocatalytic System Containing Eosin Y, MWNTs and NiO and Its Photocatalytic Activity for H2
2012 Vol. 33 (09): 2080-2084 [Abstract] ( 3972 ) [HTML 0KB] [PDF 0KB] ( 584 )    DOI:

A photocatalytic system containing Eosin Y, multiwalled carbon nanotubes (MWNTs) and NiO (Eosin Y-MWNTs-NiO) was fabricated and activated by hydrogen reduction treatment. Photocatalytic hydrogen evolution over this photocatalytic system was investigated using triethanolamine as a sacrificial reagent. The results displayed that the Eosin Y-MWNTs-NiO was an efficient photocatalyst with the highest rate of H2 evolution of 344 μmol?g-1?h-1 under visible light irradiation. Therein, the hydrogen reduction treatment played an important role in the improvement of photocatalytic activity. The activity of the photocatalytic system unactivated by hydrogen was only one-tenth of that of the activated one. Moreover, the photocatalytic hydrogen evolution was studied as functions of pH of the solution and dosage of the catalyst, respectively. Based on the results obtained, the mechanism was discussed preliminarily.

Polymer Chemistry
Select  |    Cite this article 

Worm-like PICmicelles of poly(ethylene glycol) -b-poly(ethylenimine)/plasmid DNA: Synthesis, Self-assembly and Colloidal Stability in Physiological Milieu
2012 Vol. 33 (09): 2085-2091 [Abstract] ( 4652 ) [HTML 0KB] [PDF 0KB] ( 528 )    DOI:

In this work, block copolymers of poly(ethylene glycol)-b-poly(ethylenimine) (PEG-b-PEI) with different molecular ratio between PEG and PEI were synthesized by classical ring-opening polymerization. By simply mixing PEG-b-PEI with plasmid DNA(pDNA), worm-like polyion complex micelles (PICmicelles) were spontaneously formed in solution. Their structures and morphologies in physiological milieu were investigated and characterized by 1H-NMR, GPC, DLS, AFM and Gel electrophoresis, etc. The influence of numerous parameters, including salt dissociation, protein absorption, anionic species substitution and enzymatic digestion, on the colloidal stabilities of such worm-like PICmicelles were evaluated and demonstrated. The results indicated that the longer cationic segment could be helpful to efficiently condense pDNA and improve the colloidal stability against salt dissociation and anionic species substitution. However, it could also result in insufficient PEG shielding effect against protein absorption and enzymatic digestion.

Select  |    Cite this article 

Synthesis of Tri-arm PLLA-PDLA Block Copolymers and Its Stereocomplex Crystallization Behavior
2012 Vol. 33 (09): 2092-2098 [Abstract] ( 4277 ) [HTML 0KB] [PDF 0KB] ( 470 )    DOI:

Abstract The tri-arm poly(L-lactide) was prepared by ring-opening polymerization (ROP) of L-lactide (LLA) with 1,1,1-Tris(hydroxymethyl)ethane (TME) as an initiator. The terminal hydroxyls of the pre-polymer were activated by Stannous octanoate (Sn(Oct)2). Then a series of novel tri-arm poly(L-lactide)-poly(D-lactide) (PLLA-PDLA) block copolymers were synthesized by ROP of D-lactide (DLA) with functioned PLLA-SnOct pre-polymer as a macroinitiator. Nuclear magnetic resonance spectroscopy (NMR) and gel permeation chromatography (GPC) results confirmed the configuration of the tri-arm PLLA-PDLA block copolymers with high isotacticity and high molecular weight. The block structure of copolymer could be readily adjusted in terms of the feed ratio of monomer with the PLLA pre-polymer. Differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) demonstrated that the stereocomplex PLA (sc-PLA) were formed between intramolecular and intermolecular PLLA and PDLA blocks. The melting temperature (Tm) of sc-PLA crystals was above 200℃, which was much higher than that of pure PLLA. These results show that a novel tri-arm PLLA-PDLA block copolymer would be promising as a heat-resistant PLA engineering material.

Select  |    Cite this article 

Enzymatic Degradation of Biocompatible Block Polyelectrolyte Micelles in Aqueous Solutions
2012 Vol. 33 (09): 2099-2105 [Abstract] ( 3771 ) [HTML 0KB] [PDF 0KB] ( 401 )    DOI:

Enzymatic degradation behaviors of biocompatible block polyelectrolyte poly(l-lactide)-b-poly(2-(dimethylamino)ethyl methacrylate) micelles in aqueous solutions at two different temperatures(25.0 °C, 36.8 °C)、two different pH values(4.9, 7.4)were investigated by LLS and AFM. It is found that there is an enzyme inactivation time during the degradation process. Before this time, the degradation mechanism of PLLA-b-PDMAEMA micelles follows a one-by-one process. After this time, the degraded micelles with cracks or tunnels in their cores aggregate into large micelles to minimize their surface area exposed to the solvent, therefore minimize the free energy of the micelles. After increasing temperature, the activity of the enzyme increases, and the degradation rate of micelles is much faster. At pH = 4.9, the coronas of the micelles are stretched due to the electrostatic repulsion, because of which the degradation rate of micelles is faster at pH = 4.9 than that at pH = 7.4.

Select  |    Cite this article 

Synthesis and Characterization of Electromagnetic Functionalized Polyoyrrole/γ-Fe2O3 nanospheres by Chemical one-step method
2012 Vol. 33 (09): 2106-2110 [Abstract] ( 3842 ) [HTML 0KB] [PDF 0KB] ( 543 )    DOI:

Abstract A “Chamical one-step method” (COSM) was used to prepare the electromagnetic functionalized polypyrrole/γ-Fe2O3 (PPy/γ-Fe2O3) nanospheres without any dopant. In this approach, FeCl3 acts as an oxidant for the polymerization of pyrrole and as a source of FeIII for the formation of γ-Fe2O3, which also requires the initial presence of FeII, provided by the addition of FeCl2. In this paper, the amount of FeCl2 has little effect on the morphology; however, the conductive and magnetic properties of PPy/γ-Fe2O3 nanospheres are greatly affected by the amount of FeCl2. The conductive and magnetic properties of PPy/γ-Fe2O3 nanospheres increased and reached maximum values simultaneously with increasing amounts of FeCl2. The resulting electromagnetic PPy/γ-Fe2O3 nanospheres show maximum conductivity of 72.1S/cm and magnetization of 10.07 emu/g.

Select  |    Cite this article 
Pin Hu Jianming Liu
Molecularly imprinted β-cyclodextrin polymer for the selecting recognization of bisphenol A in aqueous solution
2012 Vol. 33 (09): 2111-2116 [Abstract] ( 4418 ) [HTML 0KB] [PDF 0KB] ( 677 )    DOI:

Molecularly imprinted polymers (MIP) were synthesized by mixing bisphenol A (BPA) as the template, β-cyclodextrin as the monomer and hexamethylene diisocyanate (HDI) as the crosslinker in anhydrous dimethyl sulfoxide (DMSO). The obtained polymer particles were characterized by infrared spectrophotometry (IR) and scanning electron microscopy (SEM). The performance of the β-CD-MIP was evaluated in terms of selectivity, adsorption capacity and binding characteristics. The β-CD-MIPs exhibited better recognition and selectivity for Bisphenol A. The rebinding ability of the β-CD-MIPs towards Bisphenol A was much higher than analogs such as bisphenol C (BPC) and p-nitrophenol (p-NP). The results of the binding experiments in aqueous solution were fitted by Freundlich and Langmuir model, and indicated that the adsorption reaction was exothermic, and the low temperature was favorable for adsorption.

Select  |    Cite this article 

Phenylethynyl-terminated imide oligomer having pendent phenylethynyl group with good thermal stability
2012 Vol. 33 (09): 2117-2120 [Abstract] ( 3753 ) [HTML 0KB] [PDF 0KB] ( 583 )    DOI:

A diamine monomer 3,5-diamino-4′-phenylethynylbenzophenone(DPEB) was synthesized and phenylethynyl-terminated imide oligomers having pendent phenylethynyl group (n=4) was prepared by the reaction of 3,3′,4,4′-biphenylenetetracarboxylic dianhydride(s-BPDA), DPEB and 2,5-bis(4-aminophenoxy)-biphenyl(p-TPEQ), and end-capped with 4-phenylethynylphthalic anhydride(PEPA). The imide oligomer has low Tg and provides wide processing window. The cured films were prepared by molding the oligomer powder at 370℃ for 1 h under pressure. DMA results showed the introduction of pendent phenylethynyl group increased Tg of the cured film and the retention of storage modulus beyond Tg was promoted.

Select  |    Cite this article 

Synthesis of bis(β-hydroxyimino) titanium Complexes and their Catalysis for Ethylene Polymerization
2012 Vol. 33 (09): 2121-2128 [Abstract] ( 4106 ) [HTML 0KB] [PDF 0KB] ( 458 )    DOI:

Three β-hydroxyimino ligands 1a:(2,6-iPr2C6H3)N=C(Ph)CH2CH(Ph)OH,1b:(2,6-iPr2C6H3)N=C(Ph)CH2C(Ph)2OH和1c:(2,6-iPr2C6H3)N=C(Ph)CH2C(C12H8)OH and their bis-ligated complexes 2a:[(2,6-iPr2C6H3)N=C(Ph)CH2CH(Ph)O]2TiCl2,2b:[(2,6-iPr2C6H3)N=C(Ph)CH2C(Ph)2O]2TiCl2和2c:[(2,6-iPr2C6H3)N=C(Ph)CH2C(C12H8)O]2TiCl2) were synthesized successfully. The structures of the ligands and complexex were characterized by 1H NMR, MS, IR. In the presence of methylaluminoxane (MAO) as cocatalyst, the effects of experimental conditions in which Al/Ti mole ratio, time, temperature and pressure were varied on ethylene polymerization by 2b were investigated. These catalysts can produce polyethylene with very high molecular weight under the broad reaction conditions. The melt points of all PE samples are around 140 oC. The results of ethylene polymerization by 2a-c show that the bulky of substituents on the β-carbon influent on the catalytic activity very much. The catalyst 2b with two phenyl groups on the β-carbon gives the best catalytic activity among the three complexes.

Select  |    Cite this article 

Preparation of a Novel Antibacterial Polysulfone Ultrafiltration Membrane
2012 Vol. 33 (09): 2129-2134 [Abstract] ( 3742 ) [HTML 0KB] [PDF 0KB] ( 716 )    DOI:

Capsaicin is a kind of environmental friendly natural antifouling agent, which has excellent antibacterial properties. In this paper, the author prepared a kind of new antibacterial Polysulfone Ultrafiltration membrane with capsaicin derivatives function structure. First, capsaicin function structure monomer, such as N-(4-hydroxyl-3-methoxyl phenmethyl acrylamide (HMBA), and methyl methacrylate (MMA) compound an antibacterial type copolymer P(H-co-M) through the radical cause, which were confirmed through the infrared absorption spectrum (FT-IR) and thermo gravimetric analysis. The copolymer P (H-co-M) were introduced to PSF casting solution by the blending method, after that prepared a new antibacterial ultrafiltration membrane through the immersion precipitation phase-inversion method; The author investigated the copolymer content in the casting solution to the effect of ultrafiltration membrane separation properties and antibacterial properties. The results show that, when blended in 0.5wt % P(H-co-M), the modified ultrafiltration membrane shows the best separation performance, while the stable water flux and the interception rate were 122.2 L/(m2.h) and 84.4% for 5 mg/L humic acid solution, which increased by 13.5% and 9.2% respectively compared with the PSF ultrafiltration membrane; In addition, the bacteriostatic performance of modification ultrafiltration membrane improved significantly and when blended in 0.5wt % P(H-co-M), the antibacterial rate is as high as 58.8%; When blended in 1.0wt % P(H-co-M), the antibacterial rate is the largest, which reaches to 80.7%. PSF modified ultrafiltration membrane which contains of capsaicin function structure monomer will open up a new antibacterial membrane materials in the new field.

Chemical Journal of Chinese Universities

Total Cites and Impact Factors of Chinese Chemical Journals of 2013 JCR
The 4th International Symposium on Solar Fuels and Solar Cells (SFSC 2014)
Contents of Disciplines Classification of Chemical Journal of Chinese Universities(2013-12-31)
Total Cites and Impact Factors of Chinese Chemical Journals of 2012 JCR
The 14th National Youth Conference on Catalysis

The 8th National Conference on Chemical Biology of China

The 3th International Conference on Advances in Microfluidics and Nanofluidics (AMN2012)

10th Asian-Pacific International Symposium on Microscale Separations and Analysis(APCE2010)

  Special Issue
 · Preface to the Special Issue for Commemorating the 100th Anniversary of TANG Au-chin's Birthday(Vol.
 · Special Issue of the 15th Conference on Macro-ring Chemistry and the 7th Conference...
 · Special Issue Dedicated to Professors Xu Ru-ren and Pang Wen-qin on the Occasion of their 80th...
 · Supplement Issue of "The Fourth Intenational Conference on Theoritical Chemistry Molecular...
 · Special Issue of Great Achievements in Chemistry in China——Carrying out the Unfulfilled Wish of...
  Advertisement Service
Copyright © 2009 Editorial Department of Chemical Journal of Chinese Universities
Communication address: Editorial Department of Chemical Journal of Chinese Universities, No.2699 Qianjin Street, Changchun City, China;Zip Code: 130012
Tel.: (86)0431-88499216; Fax: (86)0431-88499216;E-mail:
Supported by:Beijing Magtech