Table of Content

10 January 2009, Volume 30 Issue 1

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下期目次预览

2009, 30(1):  0.  doi:

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高等学校化学学报2009年第30卷第1期目次

2009, 30(1):  0.  doi:

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研究论文

Synthesis and Structural Characterization of Organic-Inorganic Hybrid Material (C₂N₂H₁₀)[Zn₂(PO₄)₂] with Zeolite DFT Topology

MAO Shao-Yu^*, XIE Yu, XIE Zhao-Xiong

2009, 30(1):  1-6.  doi:

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Since the first microporous zinc phosphates with zeolite-like topologies were reported by Gier and Stucky, it has attracted much attention from chemists and materials scientists due to their chemical and physical properties and the applications as catalysts, nonlinear optical materials and ion exchangers, etc.. With a view to explore a new microporous materials, an open-framework organic-inorganic hybrid zinc phosphate was synthesized by hydrothermal method when ZnCl₂ and H₃PO₄ were chosen as raw materials, DETA as template agent. Its structure was determined by single-crystal X-ray diffraction. Crystal data: tetragonal, space group P4₂bc with lattice parameters a=b=1.46850(2) nm, c=0.89274(2) nm, α=β=γ=90°, V=1.92519(6) nm³, Z=8, D_c=2.641 g/cm³. The title compound was also characterized by IR spectroscopy and TG-DTA. Luminescent measurement of (C₂N₂H₁₀)[Zn₂(PO₄)2] shows a emission band between 665 and 688 nm when excited with 451 nm UV light. The title compound may be found its applications in red lightemitting devices.

Preparation and Photoluminescence Properties of Gd₂O₃∶Eu³⁺ Nanorods

ZHANG Song, LIU Gui-Xia^*, DONG Xiang-Ting, WANG Jin-Xian, LI Ruo-Lan

2009, 30(1):  7-10.  doi:

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Gd₂O₃∶Eu³⁺ nanorods were prepared via surfactant-assisted hydrothermal method. The structure and photoluminescence properties of the nanorods were characterized, and the growth mechanism was discussed. XRD patterns show that the precursors are hexagonal phase Gd(OH)₃ crystals, and the samples calcined at 800 ℃ are cubic Gd₂O₃. TEM images indicate that the samples are nanorods with a diameter of 60 nm and a length of 600 nm. Photoluminescence measurements show that the Gd₂O₃∶Eu³⁺ nanorods emit Eu³⁺ characteristic red-light due to ⁵D₀-⁷F_J transitions under 254 nm light excitation, which is different from that of the precursor. The results indicate that Gd₂O₃ nanorod is a candidate as host material for Eu³⁺ luminescence.

Preparation and Fluorescence Property of Metal-organic Framework Composite RhB/MOF-5

WANG Hai-Jun^1,2, ZHU Guang-Shan^1*, ZHANG Ke-Yong², SUN Fu-Xing¹, QIU Shi-Lun¹

2009, 30(1):  11-13.  doi:

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Metal-organic framework composites RhB/MOF-5 were successfully prepared by diffusion of solvent method. The investigations of Leica microscope, XRD, FTIR, UV-Vis, and photoluminescence confirm the existence of RhB in the pores of MOF-5. The composites which show strong fluorescence could be candidates for applications in optics, especially in laser systems.

Rapid Aqueous Synthesis of High-quality CdTe Colloidal Quantum Dots

LIANG Jia-Ran¹, ZHONG Wen-Ying^1*, YU Jun-Sheng²

2009, 30(1):  14-18.  doi:

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The rapid aqueous synthesis of CdTe quantum dots modified by thioglycolic acid(TGA) was stu-died through investigating and improving the factors which influence the synthesis. The control of photoluminescence properties was realized through systematically changing the volume of anhydrous ethanol and water, the temperature and the original pH value. The high-quality CdTe QDs with narrower full width at half maximum of photoluminescence spectra and larger quantum yield were obtained. Under the optimal condition(as the volume of anhydrous ethanol and water is 3 and 1 mL, original pH value is 8.0, the temperature is 40 ℃), the maximum quantum yield at room temperature is approximately 68%. A white precipitate emerged during reflux. After depositing for a week, the fluorescence intensity of the QDs with white precipitate was dramatically enhanced by 15% than that of the QDs which the white precipitate was removed. Besides, the white precipitate is preferable for the narrowing of the size distribution.

One-dimensional Coordination Polymers Generated from Organosulfur Ligand: Synthesis, Structure, Fluorescence and Magnetic Properties

WANG Lei^1,2, SUN Jin-Xu¹, DONG Wen-Jun², SHI Zhan², FENG Shou-Hua^2*

2009, 30(1):  19-22.  doi:

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Two new one-dimensional(1D) coordination polymers [M(2-mercapto-5-methyl-1,3,4-thiadiazole)₂]_n[M=Zn(1), Co(2)], were synthesized under solvothermal conditions and characterized by single crystal X-ray diffraction, FTIR, elemental analysis, and thermogravimetric analysis. Both two compounds crystallize in the monoclinic space group C2/c with analogous structures, in which the metal center exhibit distorted tetrahedral coordination geometries. The deprotonated 2-mercapto-5-methyl-1,3,4-thiadiazole molecule as a μ₂-ligand linkers the metal center into a 1D chain, which are futher linked by weak C-H···S bonds into a three-dimensional supramolecular framework. At room temperature, both two compounds exhibit intense photoluminescence. On the basis of the results of TG-DTA analyses, the structure is thermally stable up to 210 ℃ for compound 1 and 260 ℃ for compound 2. The magnetic behavior of compound 2 was studied.

Electrochemical Detection for SNP Genotyping Based on Primer Extension Reaction

QU Yu¹, CHU Xia^1*, XU Xiang-Min², SHEN Guo-Li¹, YU Ru-Qin¹

2009, 30(1):  23-27.  doi:

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The primer extension(PEXT) reaction is one of the methods most commonly used in genotyping of single nucleotide polymorphisms(SNPs). Owing to the high specificity of PEXT, the extension reaction can be performed favorably only when the primer and target DNA are perfectly matched. The ferrocene can be incorporated in the extension product by primer extension reaction, which is then captured by the capture probe self-assembled on the electrode surface. Differential pulse voltammetry(DPV) was used to detect the presence of the ferrocene in close proximity of the gold electrode surface. The effects of the annealing temperature, concentration of polymerse and the hybridization temperature on the peak current were evaluated in detail. Furthermore, this proposed method was successfully applied to the genotyping of SNPs at β-Thalassemia(CD28). The detection limit of this method can be reached down to 0.86 fmol/L and the experimental results show that it is a simple, speedy and sensitive approach for genotyping of SNPs.

Construction of the Calibration Model for Near-infrared Spectral Analysis of Complex Samples

HAO Yong, CAI Wen-Sheng, SHAO Xue-Guang*

2009, 30(1):  28-31.  doi:

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Design of calibration samples is often used to improve the cost-effectiveness of near-infrared(NIR) spectral analysis. The feasibility of constructing a partial least squares(PLS) model with a parsimonious calibration set for NIR spectral analysis was discussed. Waveband selection was also investigated for improving the predictive ability of the model. The results indicate that, in construction of the quantitative analysis PLS model, the samples in a calibration set should be as similar as possible to the samples in the prediction set. For prediction of the samples with diverse properties, the diversity of the calibration samples is necessary to ensure the predictive ability of the model. On the other hand, waveband selection is proved to be very important for improving the predictive ability of models.

Preparation and Characterization of Thermally Actuated Microfluidic Valve on Glass Microchips

LI Zhi-Ming, CHEN Heng-Wu^*, MA Dan

2009, 30(1):  32-36.  doi:

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Poly(N-isopropylacrylamide)(PNIPAAm) undergoes a rapid phase transition at its lower critical solution temperature(32 ℃), leading to sharp changes in its volume and surface wettability. The thermally responsive volume change behavior of the PNIPAAm can be used to manipulate the microfluids in microchannels. In the present work, PNIPAAm monolithic plugs, serving as the thermally actuated microfluidic valve, were prepared by photoinitiated polymerization within the channels of a glass chip. Photo-polymerization of the N-isopropylacrylamide monomer in water/ethanol was carried out using 2-hydroxy-2-methyl propiophenone as the photo-initiator. The polymerization conditions for the thermally actuated microfluidic valve and its fluid-manipulating behavior were systematically investigated. Based on these investigations, a protocol of on-chip-integrated micro-flow injection(μFIA) system equipped with a single thermally actuated microfluidic valve was established. The analytical performance of the μFIA system was demonstrated with the chelating reaction between the magnesium(Ⅱ) and the fluorescent agent O,O'-dihydroxyazobenzene. Experimental results show that the mirofluidic valve behaved well for the flow control and was promising in the field of microfluidics.

Superoxide Biosensor Based on Superoxide Dismutase/Nano-ZnO

DENG Zi-Feng, XU Wei, YANG Xiao^*

2009, 30(1):  37-41.  doi:

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A nanoporous ZnO film(nano-ZnO) was prepared by physical vapor deposited method and its physical and chemical properties were studied by means of SEM, UV-Vis, XRD and electrochemical methods. The results show that nano-ZnO is a nanoporous film with a polycrystalline hexagonal wurtzite structure. The average diameter of the nanoparticles is about 50—100 nm and its band gap is 3.37 eV. A new superoxide dismutase(SOD) modified nano-ZnO electrode(SOD/ZnO) was prepared by dipping method. SOD was modified stably in the nano-ZnO film confirmed by electrochemical impedance spectroscopy(EIS) and the direct electron transfer could be achieved confirmed by cyclic voltammetry(CV). Spectrum studies indicated that SOD kept its bio-activities. A novel third-generation O₂^- biosensor with high selectivity, quick response time(4 s), large linear range(anodic current response: 0.24—180×10^-6 mol/L; cathodic current response: 0.12—250×10^-6 mol/L) and good sensitivity(anodic: 2×10^-7 mol/L; cathodic: 1×10^-7 mol/L) was constructed and its analytical properties were studied.

SOI-based Cell Electrofusion Chip

HU Ning¹, YANG Jun^1*, HOU Wen-Sheng¹, ZHENG Xiao-Lin^1*, CAO Yi^1,2, YANG Jing¹, XU Rong¹, ZHANG Rui-Qiang¹

2009, 30(1):  42-45.  doi:

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A MEMS-based novel cell electrofusion chip design was presented for exploring cell electrofusion in a low-voltage condition. Its essence is on the using of microfabrication to shorten the distance between an electrode pair, hence decreasing the required voltage during the alignment and fusion. The chip prototype was fabricated on a SOI substrate, which was subsequently covered by the aluminium film(~2 μm thickness) to enhance the conductivity and SiO₂(150 nm thickness) film to improve the biocompatibility, and packaged via DIP method. On-chip dielectrophoresis-based cell alignment and cell fusion experiments were explored where much smaller voltage(only 1/20 of traditional electrofusion device) was required. Most cells were aligned as cell-cell twins under dielectrophoretic force, which is of significant advantage than multi-cell alignment in traditional method. Tobacco mesophyll protoplasts electrofusion experiments have been explored on the microchip. After load a series of shiort-duration(50 μs) and low-voltage(~40 V) electric pulse, many aligned cells could be fused within several minutes under the high-strength electric field(1—10 kV/cm). It is much faster than traditional method(10—30 min). Compared with PEG(less than 1%) and traditional electrofusion(less than 5%) methods, higher fusion efficiency(about 31%) was also obtained.

Fragmentation Study of the C Ring in Flavone and Isoflavone Aglycones by Electrospray Ion Trap Time-of-Flight Mass Spectrometry

XU Ying¹, DONG Jing¹, WANG Hong¹, WAN Le-Ren², HASHI Yuki^2*, CHEN Shi-Zhong^1*

2009, 30(1):  46-50.  doi:

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Our experiment analyzed the mass spectrometric behavior of four flavone and six isoflavone aglycones in negative ion mode using HPLC/ESI-IT-TOF. We summarized the relationship between their structural features and the corresponding characteristic fragmentation behavior. The fragmentation of A^1,3- was formed by Rretro-Diels-Alder(RDA) reaction on the C ring of flavone aglycones and the relative abundances were higher than other fragmentation types'. Furthermore, isoflavone aglycones appeared specific fragmentations of B^0,3- which derived from the C ring's breakage with high relative abundances. These results show that the various conjugated systems belong to flavone and isoflavone aglycones influenced the fragmentation behavior of C ring. In addition, the substitution patterns on A and B rings lead to different types of produce ions and the intensity of relative abundances, respectively. Our findings will be helpful in identifying the structures of flavone and isoflavone aglycones rapidly with the method of mass spectrometry.

研究快报

Sensitive Determination of Drug Alkaloids by Capillary Electrophoresis with Electrochemiluminescence Detection and Its Applications to Analysis of Human Urine

LIU Yan-Ming^*, TIAN Wei

2009, 30(1):  51-53.  doi:

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A new approach for the determination of methylephedrine hydrochloride(ME), thebaine, codeine phosphate(CP), and acetylcodeine(AC) was established by CE-ECL with ionic liquid(1-butyl-3-methylimidazolium tetrafluoroborate, BMIMBF₄). The conditions for the CE separation, ECL detection and the effect of ionic liquid(IL) were systematically investigated. Under the optimal conditions, the four analytes were well separated within 8 min using BMIMBF₄ as additive in the electrophoretic buffer. The concentration detection limits of ME, thebaine, CP, and AC were 2.1×10^-8, 1.4×10^-7, 6.3×10^-8, and 3.6×10^-8 mol/L(S/N=3), respectively. The limits of quantitation(LOQ, S/N=10) in real human urine samples were 7.6×10^-7 mol/L for ME, 3.6 ×10^-6 mol/L for thebaine, 6.5×10^-7 mol/L for CP, and 4.6×10^-7 mol/L for AC, respectively. The recoveries of four alkaloids at different levels in human urine samples were between 90.0% and 103.5%. The developed method was successfully applied to the determination of four drug alkaloids in human urine samples.

PPESO₃ Monitoring the Proress of Microwave-enhanced Enzymatic Digestion on Protein

HUAN Yan-Fu¹, ZHANG Zhi-Quan¹, FEI Qiang¹, FENG Guo-Dong^1,2*, MU Ying^2,3*

2009, 30(1):  54-56.  doi:

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The mini microwave resonance cavity was used to accelerate proteolytic cleavage of protein. A fluorescent polymer PPESO₃ as a fluorescent indicator was used to monitor proteolytic cleavage of protein in the microwave assisted protein digestion process. In this paper, the long-term stability of the PPESO₃ and the PPESO₃ mixed with trypsin was studied, and the detection of proteolytic cleavage of bovine serum albumin(BSA) was obtained satisfactory results. The PPESO₃ was provided a novel, simple, quick determination to set the optimization parameter of the microwave-assisted protein hydrolysis. Meanwhile, the fluorescent detection devices can be integrated into the microwave assisted protein digestion system, for the development of the mini Low-power microwave protein proteolytic system would provide a very good idea.

Standardless Semi-quantitative Elemental Analysis of Steel Using Laser Ablation Time-of-flight Mass Spectrometry

HE Jian^1*, HUANG Rong-Fu², YU Quan², HANG Wei^1,2*, HUANG Ben-Li²

2009, 30(1):  57-59.  doi:

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A small high irradiance laser ablation and ionization time-of-flight mass spectrometer with orthogonal sample introduction was described. Nearly uniform relative sensitivity coefficients as well as satisfactory resolving power(~2200) were achieved for most of metal elements. Fairly good signal stability was obtained by automated step moving of the sample stage in short time intervals. Interferences of multiply charged ions and polyatomic ions were nearly eliminated in the spectrum by utilizing helium as the buffer gas in the ion source, which resulted in a relative clean background. Standardless semi-quantitative analysis of steel was realized and the limits of detection are about 10^-6 g/g for most of metal elements.

研究论文

Preparation and Biological Characterization of Antibody and DNA Dual-labeled Gold Nanoparticles

LI Fu-Rong^1*, QIAO Fei-Yan², KONG Xiao-Li¹, ZHOU Han-Xin¹, QI Hui¹, REN Li-Li¹

2009, 30(1):  60-63.  doi:

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Gold nanoparticles labeled by both antibody(IgG) and single stranded DNA(ss-DNA) were synthesized and characterized. The stability and reactivity of the dual-labeled nanoparticles were compared with the conventional IgG or ss-DNA modified nanoparticles. It was found that the IgG adsorption significantly improved the stability of the nanoparticles in aqueous solution, which is beneficial for attaching ss-DNA. The presence of IgG also effectively prohibits the desorption of ss-DNA against dithiothreitol(DTT) displacement. The coverage on dual-labeled nanoparticles was found to be (50±15) ss-DNA/nanoparticle and (10±2) IgG/nanoparticle, respectively, compared to the value of (70±15) ss-DNA/nanoparticle of only ss-DNA-labeled gold nanoparticles. Dot-immuno and cross-linking experiments confirmed that both the IgG and ss-DNA retained their bioactivity on the nanoparticle surface. The dual-labeled nanoparticles have potential to be used as novel bio-probes for ultrasensitive detection.

Convenient Synthesis of Highly Functionalized α-Cyanothiophene Derivatives via Three-component Reaction

GAO Yu-Xiang^1,2, SUN Jun³, XU Xian-Xiu^1*, LIU Qun¹

2009, 30(1):  64-67.  doi:

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A convenient one-pot synthesis of highly functionalized α-cyanothiophene derivatives(4) by three-component reactions was developed. In the presence of K₂CO₃, 1,3-dicarbonyl compounds 1 reacted with CS₂(2) and bromoacetonitrile(3) resulted in the formation of functionalized α-cyanothiophenes(4) in high yields. The simplicity of execution, mild conditions, ready availability of substrates and high yields, make this synthetic strategy considerably attractive for academic research and practical applications.

Interaction Between PVA and BSA and Its Influence on the Conformation of BSA

WANG Gai-Zhen², HE Jin-Tian^1*, FENG Mei-Yan¹, XIA Qing¹

2009, 30(1):  68-71.  doi:

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Gel filtration chromatography, fluorescence spectrophotometry, differential scanning calorimetry(DSC) and Fourier transform infrared spectrophotometry(FTIR) were used to investigate the interaction between polyvinyl alcohol(PVA) and bovine serum albumin(BSA) under physiological conditions. The results show that BSA form complex with PVA. During BSA interaction with PVA, emission fluorescence derived from tryptophan of BSA was partially quenched upon binding to PVA. However, microenvironment of tryptophan was not changed during the binding process. The results of DSC suggest that the interaction of PVA with BSA maybe reduce the intramolecular interaction of BSA or PVA. FTIR spectrometry was combined with resolution enhancement technique Fourier deconvolution and Gaussian curve-fitting procedures to quantitate the spectral information from the amide Ⅰ bands of BSA within the freeze-dried mixture of PVA and BSA. The results show that the interaction of PVA with BSA affected only the β-sheet content but not α-helix, which is usually used as an indicator of the protein structural integrity in lyophilized state. Analysis of the BSA within the mixture of BSA and PVA suggest that interaction of PVA with the BSA maybe preserve the stability of BSA during lyophilization process.

Synthesis and Activity Evaluation of α-Halogen Substituted Succinate-based Hydroxamic Acids as Matrix Metalloproteases Inhibitors

HAN Han, LIANG Yuan-Jun, WEI Xiao-Li, XU Xiao-Yu, LIU Ke-Liang^*

2009, 30(1):  72-77.  doi:

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Matrix metalloproteinases(MMPs) are a family of zinc-dependent proteolytic enzymes. The overexpression of these proteinases is associated with a number of pathological processes.Thus, matrix metalloprotease inhibitors(MMPIs) are expected to be useful for the treatment of these disorders. Fifteen novel α-halogen substituted succinate-based hydroxamic acid analoges were designed and synthesized as MMPIs. Introducing halogen to the α-position of hydroxamic acid is expected to potentialize compounds' inhibitory activity and lipophilicify. All of new compounds' inhibitory activities against MMP-2 and MMP-9 were tested in vitro. Among these compounds, four of them exhibited similar inhibitory activities against MMP-2 and five of them showed similar inhibitory activities against MMP-9 comparing, respectively, with positive control, Ilomastat. The activity results indicate the following SAR: (1) It seems that introducing halogen doesn't have significant effect on inhibitory activity. (2) Configuration of the new chiral centre arising from introducing halogen perhaps has nothing to do with the inhibitory activity. (3) Compouds possessing hydrophilic groups as the R₂ substituents appeared to have improved potency as compared to those with hydrophobic groups as the R₂ substituents. (4) Planar fused-ring aryl groups as the R₃ substituents perhaps facilitate improving compounds' inhibitory activity.

Chemical Constituents from Endophytic Phomopsis sp. Lz42 of Maytenus hookeri

YUAN Lin^1,2, MA Juan¹, WANG Ting³, LI Guo-Hong¹, SHEN Yue-Mao¹, ZHAO Pei-Ji^1*

2009, 30(1):  78-81.  doi:

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Endophytes, commonly present in higher plants, are important sources of natural products with pharmaceutical potential. A new sesquiterpenoid, 4-deacetyl-10-oxo-dihydro-botrydial(1), and a new sterol, 22E,24R-5α,8α-epidioxyergosta-6,22-dien-3β-formate(2), were isolated from solid cultures of an endophytic fungal strain Phomopsis species Lz42, cultivated on Maytenus hookeri, together with five related known compounds, 4β-acetoxy-9β-10β-15α-trihydroxyprobotrydial(3), 22E,24R-5α,8α-epidioxyergosta-6,22-dien-3β-ol(4), ergosterol(5), 22E,24R-ergosta-7,22-diene-3β,5α,6β-triol(6) and 22E,24R-ergosta-7,22-diene-3β,5α,6β,9α-tetraol(7). Their structures were identified by extensive spectroscopic, experiments especially 2D-NMR.

Total Synthesis of 2-Methyl-7-[ω-(1H-imidazol-1-yl)ethoxy]-Isoflavone Derivatives and Their Antioxidative Activity

CHEN Zhan-Guo^*, ZHAO Hai-Xia, WEI Jun-Fa, LIU Bo

2009, 30(1):  82-89.  doi:

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Ten kinds of imidazolyl isoflavone derivatives were synthesized from resorcinol and substituted phenylacetic acid as start materials via five-steps. The structures of the ten target compouds were confirmed via ¹H NMR, ¹³C NMR and elemental analysis. The reaction time was shortened greatly in many reaction process by a microwave-mediated method. The antioxidative activities of ten target compounds were researched. Among them the 4'-hydroxy-2-methyl-7-[3-(1-imidazolyl) propoxy] isoflavone has a strongly capacity of scavenging radical.

Synthesis of 3-(3S-t-Butoxyl)succinimidyl-β-lactams and the Stereoselectivity of the Reaction

ZHANG Ping, LIU Na, WANG Lan-Zhi, LI Yuan^*

2009, 30(1):  90-94.  doi:

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S-Malic acid is the chiral induction agent widely used in organic synthesis. In order to investigate the stereoselective synthesis of β-lactams, eight new 3-(3S-t-butoxyl)succinimidyl-β-lactam derivatives 2a—2h were obtained by Staudinger reaction using S-malic acid as the chiral induction agent and their structures were confirmed by ¹H NMR, IR and elemental analysis. The stereochemistry of the reaction was also investigated by the ¹H NMR, 2D NMR and X-ray diffraction analyses methods. The results indicate that the reaction of 3-(3S-t-butoxyl)succinimidyl acetyl chloride with imines(under Et₃N) showing very good cis/trans stereoselectivity, and the trans-β-lactam is the only product. The diastereomeric selectivity is also good, the d.e. is between 28%—70%.

Interaction Between Gold Nanoparticles and ssDNA

SUN Li-Ping^1*, ZHANG Jian-Feng¹, LI Hui¹, WANG Xiu-Yan¹, ZHANG Zhao-Wu¹, WANG-Shuang¹, ZHANG Qi-Qing^1,2*

2009, 30(1):  95-99.  doi:

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The interaction between unmodified gold nanoparticles and single-stranded DNA (ssDNA) was studied at different pH value. And the sequence-dependent stability of ssDNA-GNPs complex was investigated. GNPs precipitated from red colloid solution in the form of aggregation after alkalization with NaOH or dissolve after acidification with HCl. Both processes were irreversible. If the same particles were incubated with ssDNA, ssDNA-GNPs complex were stable against NaOH-induced aggregation at pH=12.6, and aggregated at pH=1.4, while redispersed at pH=12.6. It was concluded that unmodified GNPs could be coated by unmodified ssDNA, which protected GNPs dispersing in solution at pH=12.6, and prevented GNPs from dissolving at pH=1.4, as measured by TEM and UV-Vis absorption spectrum. The bindig affinities of oligonucleotides to GNPs were different in the order of poly dA>poly dC>poly dT. Moreover, longer ssDNA had stronger protective effect to gold nanoparticles. HCl-induced GNPs aggregation could be an effective method to identify the diversity of deoxyribonucleotides in ssDNA sequences.

Theoretical Investigation on the Vibrational Spectra of Dehydroascorbic Acid

LIU Jing-Li1, GUO Yong^1*, XUE Ying^1,2, YAN Guo-Sen^1*

2009, 30(1):  100-105.  doi:

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去氢抗坏血酸; 密度泛函理论; 振动光谱; 简正坐标分析

Partial Oxidation of Methane to Syngas over Cr₂O₃ Catalysts

LIU Shu-Qiang, SONG Yue-Qin, HE De-Hua^*, LI Zhan-Ping

2009, 30(1):  106-112.  doi:

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Cr₂O₃ catalysts were prepared by citric acid method and direct decomposition of Cr(NO₃)₃. The POM reactions were carried out in a flow-type fixed bed micro reactor(quartz tube, i.d. 5 mm) at atmospheric pressure. The influences of reaction temperature and space velocity on POM reaction were investigated. The results show that the conversion of methane, selectivities of CO and H₂ increase with the reaction temperature(500-750 ℃) and the oxygen is almost exhausted under the conditions of GHSV=12×10⁴ h^-1 and V(CH₄)∶V(O₂)=2. Furthermore, the conversion of methane, selectivities of CO and H₂ increase with the GHSV(6.0×10⁴-24×10⁴ h^-1) under the conditions of V(CH₄)∶V(O₂)=2 at 700 ℃. In 500 h on stream, the conversion of methane, selectivities of CO and H₂ decrease slowly with the time on stream and the oxygen is almost exhausted under the conditions of GHSV=12×10⁴ h^-1 and V(CH₄)∶V(O₂)=2 at 700 ℃. The results of X-ray diffraction(XRD), TEM and BET specific surface area showed that the sinter of Cr₂O₃ catalyst may be responsible for the deactivation of Cr₂O₃ catalyst. Methane pulse reaction was carried out and the results indicated that the POM mechanism over Cr₂O₃ catalyst may be Mars-Van Krevelen mechanism.

Dielectric analysis for the System Composed of Polystyrene Membrane Interfused with Polypyrrole Particle and Electrolyte SolutionsInfluence of Species and Concentration of the Electrolyte Solutions to the Permeability of the Membrane

LU Qing, ZHAO Kong-Shuang^*, ZHAO Fang, JIA Jing-Jin

2009, 30(1):  113-120.  doi:

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Dielectric measurements were carried out for polypyrrole(PPy)/polystyrene(PS) composite membrane immersed in different concentration of NaCl, KCl, CaCl₂ and MgCl₂ electrolyte solutions over a frequency range from 40 Hz to 11 MHz, two relaxations were observed. The dielectric relaxation mechanism was explained by the dielectric theories based on Maxwell-Wagner polarization relaxation, the system was modelled and the phase parameters were calculated via Hanais method. From the dielectric parameters, we discussed the electric property and the selectivity to different ions in the electrolyte solutions of the membrane in detail. Futher more, we acquired parameters of the membrane such as its concentration of the fixed charge. Valuable results of the ion permeability of PPy/PS membrane were obtained.

Adsorption of Coordination Compound of Ag(I) on TiO₂ Nanoparticles

ZHANG Xia^1*, ZHAO Yue¹, ZHOU Chun-Bin², SUN Ting¹

2009, 30(1):  121-124.  doi:

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An efficient separation of coordination compound of Ag(Ⅰ) was carried out taking TiO₂ nanoparticles as adsorbent, [S₂O₃]^2- anion as ligand and Flame Atomic Absorption Spectrophometer(FAAS) as detector to determine the concentration of Ag(Ⅰ). The effect of the crystalline structure of TiO₂ nanoparticles, pH values, adsorption time, initial concentration of Ag(Ⅰ), and some coexistent ion on the adsorption rate was systematically studied. The FTIR spectrum show that the coordination compound of Ag(Ⅰ) is physically adsorbed on the surface of TiO₂ nanoparticles. The adsorption isotherm of Ag(Ⅰ) on nano-TiO₂ show “S” type, which can be explained by the multi-molecular layer adsorption. The Ag(Ⅰ) adsorbed on TiO₂ nanoparticles could be eluted completely by mixed solution of nitric acid(1 mol/L) and sulfourea(2 g/L). The above experiment results would be valuable for using the nano-adsorbents to separate trace Ag(Ⅰ) in waste water.

Characteristics of Perfluoroethane Thermal Decomposition

HE Lin¹, HAN Jun^1*, WANG Guang-Hui¹, Heejoon Kim², YAO Hong³

2009, 30(1):  125-128.  doi:

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Perfluorocarbons(PFCs) gases have high global warming potential(GWP) and a long lifetime in the atmosphere. It is difficult to decompose these gases due to their tetrahedral structure arising from strong C—F bonds. This paper discussed C₂F₆(one of PFCs gases) thermal decomposition characteristic under 950—1100 ℃ in a laboratory scale reactor. The effects of C₂F₆ initial concentration, reaction temperature, residence time on C₂F₆ decomposition ratio were also investigated. The experimental results indicate that the lower initial C₂F₆ concentration, higher reaction temperature, longer residence time can promote C₂F₆ decomposition ratio. On the basis of the results, it can be drawn that the reaction order of C₂F₆ thermal decomposition is between 0 and 1. Above 90% C₂F₆ decomposition ratio can be achieved under a temperature of 1100 ℃, 223.21 μmol/L initial C₂F₆ concentration and 2 s residence time. Basis on the calculation, the activation energy(E_a) and the frequency factor(A) of C₂F₆ thermal decomposition in the temperature range of 950—1100 ℃ were 313.2 kJ/mol and 8.8×1011 s^-1, respectively.

Controlled Preparation of Nano-Au/NaZSM-5 Catalyst and Its Catalytic Performance

BI Yu-Shui^1*, LÜ Gong-Xuan²

2009, 30(1):  129-134.  doi:

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Series of highly dispersed size-controlled nano-Au/NaZSM-5 catalysts were prepared by nitromethane reduction-colloid gold immobilization method. Taking heterogeneous CO oxidation as a model reaction, the influences of Au particle size, pH value, reaction temperature, reaction time, activation temperature and Au loading amount on the activities of the catalysts were investigated. These catalysts were characterized by means of transmission electron microscopy(TEM), powder X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS) and H₂ temperature programmed reduction(H₂-TPR) to verify the surface chemical states and the structures of the catalysts. The results show that both the preparation procedure and the reaction conditions have great influences on the sizes of gold particles and the activities of Au/NaZSM-5 catalysts. The performances of the catalysts are obviously dependent on the sizes of gold nanoparticles.

Adsorption and Conformational Changes of Melittin on the Surface of Functionalized Gold Nanoparticles

WANG Lei, DANG Yong-Qiang, ZHANG Min, SUN Jian, WU Yu-Qing^*

2009, 30(1):  135-139.  doi:

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As the wide applications of gold nanoparticles(GNPs) in various fields as the biochemistry and biomedicine, the present investigation is geared to the practical demand. Recently, the capability of sulphydryl carboxylate functionalized GNPs to promote the folding of a positive charged peptide into an α-helix was established. This design allowed favorable electrostatic interactions between the nanoparticles and the peptide when the positive charged residues were positioned in a cofacial manner along the helix and was responsible for the assisted folding observed. GNPs coated with different chain lengths of sulphydryl carboxylate are prepared by adding sulphydryl carboxylate into GNPs solution which is synthesized via reducing tetrachloroauric acid(HAuCl₄) by sodium borohydride. The structure of the functionalized GNPs can make it interact with electriferous proteins. Multiple spectral means have been used to study the interaction between the functionalized GNPs and melittin. The results show that the functionalized GNPs induced melittin to form α-helix by electrostatic interactions, and it is directly related with the chain length of sulphydryl carboxylate.

Invalidation Mechanism of Alloy Materials for Li-ion Batteries

WANG Lian-Bang^*, YANG Zhen-Zhen, KANG Hu-Qiang, HUANG Li-Jun, MAO Xin-Biao, MA Chun-An

2009, 30(1):  140-143.  doi:

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Sn-based alloy is a promising negative material for Li-ion batteries. In this work, Sn/Cu film was prepared by electroplating method. After heat treatment, a Cu₆Sn₅ alloy was formed. Experimental results show that a lot of Li oxide is formed during Li insertion process due to the decomposition of organic electrolyte, which resulted in a large volume expansion of alloy electrode. After Li extraction, some Li was remained in Li₂SnCu, which resulted in an irreversible capacity decay at the first cycle. Some novel electrolytes may be helpful to relax the volume expansion and enhance the cycle life of alloy electrode materials.

Process of Phenol Degradation in a Divided Electrolytic Cell with Biofilm-cathode and Optimization of Conditions

ZHANG Xue-Na, HUANG Wei-Min, GAO Yu, WANG Xuan, LIN Hai-Bo^*

2009, 30(1):  144-147.  doi:

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Phenol is one of the main components of the wastewater from crude oil refineries and it is used for the target contamination degraded in this paper. A key method for the treatment of wastewater from crude oil refineries was developed by different biofilm-electrode reactors. The results indicate that phenol degradation rate in the biofilm-cathode of the biofilm-electrode reactor in a divided electrolytic cell is no better than the biofilm-electrode reactor in an undivided electrolytic cell. However, phenol degradation rate is 0 after 18 h reaction and the removal rate of chemical oxygen demand(COD) is 80% after 16 h reaction in the biofilm-cathode of the biofilm-electrode reactor in a divided electrolytic cell. The conditions of the phenol degradation in the biofilm-cathode of the biofilm-electrode reactor in a divided electrolytic cell were optimized. It is shown that the best conditions of the phenol degradation on the biofilm-cathode in the biofilm-electrode reactor of an divided electrolytic cell are current at 5 mA, phenol mass concentration at a lower one than 200 mg/L and the temperature at 35 ℃.

Effect of Substrate Temperature on Growth and Magnetic Properties of Nanocrystal Fe₃N Thin Films

WANG Li-Li^1,2, JIANG Wei-Di³, ZHAO Li-Jun¹, GONG Jie¹, ZHENG Wei-Tao^2*

2009, 30(1):  148-151.  doi:

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The nanocrystal ε-Fe₃N thin films were deposited on Si(100) substrate at different substrate temperatures of 150, 250, 350, 450 ℃ by DC magnetron sputtering. The structure, morphology and magnetic properties of the films deposited at different substrate temperature were characterized via X-ray diffraction(XRD), scanning electron microscopy(SEM) and vibrating sample magnetometer(VSM).The results show that ε-Fe₃N has ferromagnetic properties, and its grain sizes, growth velocity and unsaturated magnetization measured at 400 kA/m field increase with increasing substrate temperature. The coercive force H_c increased to 18.72 kA/m at substrate temperature of 350 ℃ firstly, the H_c decreased with the substrate temperature increasing to 450 ℃. It can be deduced that exchange length (L_ex) of nanocrystal ε-Fe₃N thin films was about grain size 30 nm.

Reaction Mechanics on Anode Surface of BaCo_0.7Fe_0.2Nb_0.1O_3-δ Membrane Reactor

SHEN Pei-Jun, DING Wei-Zhong^*, ZHANG Yu-Wen, ZHOU Yu-Ding, YANG Zhi-Bin, QIN Guo-Li

2009, 30(1):  152-158.  doi:

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The reaction mechanism on anode surface of membrane reactor was studied and proposed. The effects of catalyst micron on anode surface and catalyst-bed in membrane reactor were concluded. The “Catalystic dissociation mechanism” was proposed as the main reason for the increment of oxygen permeation in CH₄-reforming membrane reactor; the reactive activity sequence of compositions on membrane surface was H₂>CO>CH₄; the main reaction on anode surface would turned into oxidation of H₂ or CO from directly oxidation of CH₄ and the oxygen permeation of membrane would be significantly increased as soon as the H₂ or CO was added into CH₄ gas; and the “lattice-oxygen-ion pattern” dominate the oxidated reaction on the membrane surface.

Gold-silver Framework Monolayer Nanostructure Prepared by in-situ Sacrificial Template Reaction and Their Application for SERS

NING Xiao-Hua, XU Shu-Ping, DONG Feng-Xia, AN Jing, TANG Bin, ZHOU Ji, XU Wei-Qing^*

2009, 30(1):  159-163.  doi:

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A gold-silver nanoframe monolayer nanostructure was obtained on the glass slide using the in-situ sacrificial template reaction. First the silver nanoprisms(~79.2 nm edge length) were prepared as the sacrificial template and were assembled on the slides through electrostatic interactions. The chloroautric acid in-situ reacted with the silver nanoprisms as oxidant. We evaluated the effect of oxidation reaction time on the morphologies and the LSPR properties of the prepared nanoframes. The thickness of gold-silver framework can be adjusted from 29.3 nm to 16.2 nm. We applied the gold-silver framework monolayer as a new surface-enhanced Raman scattering(SERS) substrate for determining 4-aminothiophenol.

Density Functional Theory Study of Ozone Adsorption on CuO(110) Surface

QIN Wu, LI Xin^*, MENG Xiang-Li, QIANG Liang-Sheng

2009, 30(1):  164-169.  doi:

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Adsorption processes and electronic properties of ozone molecule on 2×1 CuO(110) surface(S1) and Fe-doped 2×1 CuO(110) surface(S2) were studied using density functional theory(DFT). Results showed that the interactions between ozone molecule and the two surfaces were furious, and the energies of barriers and the energies of reactions were negative, which showed that the reactions could easily happen on the surface systems. According to the analysis of density of state and charges density, we found that ozone molecular was chemically adsorbed on the bridge site of S1 as ozonide, and ozone molecule decomposed into one adsorbed surface oxygen atom and one free oxygen molecule. The results of theoretical calculation showed that the essence of the adsorption of ozone molecule on S1 and S2 is related to the interaction between the valence orbital of ozone molecule and hybridized surface orbital of the metal-oxide surface.


Spin-orbit ab intio Calculation Studies on C-I Bond Dissociation of C₂F₅I Molecule

ZHAO Shu-Tao, YAN Bing^*, LI Rui, GUO Qing-Qun, TIAN Chuan-Jin, LIAN Ke-Yan, PAN Shou-Fu

2009, 30(1):  170-173.  doi:

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Perfluoroalkyl iodide has been applied extensively in the electric-discharge iodine laser, photo-dissociation iodine laser. In this paper, the vertical excitation energies and one-dimension effective potential energy curves of perfluoroalkyl iodide were investigated with multireference perturbation theory. All-electron basis sets were used and relativistic effects were treated for the iodine atom. It is found that there are two electronic curves crossing between the excited state 3³A'' and 1¹A'', 2¹A' around the region of 0.241 nm; and the vertical electronic energies of 3³A''(³Q₀) is 4.658 eV, which is in good agreement with experimental values 4.662 eV.The feasibility of the molecule for iodine laser was discussed.

DFT Studies on the Structure and Electronic Spectra of C₆₂ and Its Pyridinyl Derivatives

KAN Yu-He^*, LI Qiang

2009, 30(1):  174-177.  doi:

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The geometry and electronic structure in C₆₂ and its four pyridinyl derivatives were calculated with DFT method at BP86/TZP level. With the time-dependent density functional theory(TD-DFT) method, we can assign the lowest excitation transitions and model absorption spectra. TDDFT results show that electronic transition in four isomers occurs both inside C₆₂ intra-molecules and from pyridine substituent to C₆₂. Different position of N atoms significantly affects the oscillator strength of 420 nm absorption band, especially in cis- form compounds, while the similar electronic absorption characteristics are shown in two trans- form derivatives.

研究快报

Electrochemical Fabrication of Gold Electrode Pairs with Nanoscale Gap

ZOU Wen-Jun¹, WEI Zhi-Xiang², YAO Jian-Lin^1*, GU Ren-Ao¹

2009, 30(1):  178-180.  doi:

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Metallic electrode pairs with angstrom or nano-scale gap play a key role in studying the electron transport in molecular electronic and nano-electronic devices. Here we report a novel method of electrochemical etching to prepare gold electrode pairs. By adjusting the parameter of the homemade feedback loop and the etching voltage, a series of electrode pairs with different sizes of gap were fabricated. The process is simple and dispenses with special equipments. This method also has the potential for fabricating other metallic electrode pair with a controlled gap distance.

研究论文

Adsorption of Humic Acid on Weakly Basic Resin with Macropores

WANG Jin-Nan^1,2, LI Ai-Min^1,2*, ZHOU You-Dong^1,2, ZHANG Quan-Xing^1,2

2009, 30(1):  181-184.  doi:

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Adsorptions of humic acid(HA) and tanic acid(TA) on weakly basic resin(D-301) were investigated. The result indicates high molecular weight of humic acid can decrease resins adsorption capacity. Furthermore, resins adsorption capacity for humic acid is slightly higher in the presence of low concentration of phenol, but a decrease in resins adsorption capacity for humic acid is observed in the test when concentration of phenol is high. NaCl and pH also show an influence to resin's adsorption capacity.

Preparation of Photo-Tunable Polarizer Based on Ordered Electrospun Nano-fiber Membrane

HAN Guo-Zhi^1,2, SHAO Ye¹, XU Hua¹, GU Zhong-Ze^1*

2009, 30(1):  185-190.  doi:

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Based on ordered electrospun, membranes composed of aligned nano-fibers were obtained. By utilizing the interaction between ordered nano-fiber and nematic liquid crystals, we fabricated a novel polarized membrane with photo-tunability. In visible light region, ordered PMMA nano-fibers membrane filled with liquid crystal mixture exhibited obvious polarized properties. As the liquid crystal mixture containing azo liquid crystal can undergo transition from nematic phase to isotropic phase, polarization ability of membrane can be switched by light irradiation.

Structure and Dynamics of Confined Polymer Chain in Dilute Solution

HE Yan-Dong, YOU Li-Yan, WANG Xiao-Lin, LÜ Zhong-Yuan^*, LI Ze-Sheng

2009, 30(1):  191-195.  doi:

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The structure and dynamics of confined single polymer chain in dilute solution, either in equilibrium or subjected to different flow fields, are investigated by means of dissipative particle dynamics simulations. The no-slip boundary condition without density fluctuation near the wall is taken into account to mimic the environment of a nanochannel. The dependence of the radius of gyration and the diffusion of the chain on the strength of the confinement and the solvent quality is studied. In non-equilibrium systems, both the Couette flow and the Poiseuille flow acting on a dilute polymer solution are investigated. The effect of the interaction between polymer and solvent under these two flow conditions are found to be the same: the polymer migrates to the center of the channel when the interaction was reduced. With increasing the flow strength, there are two peaks with a dip in the center of the polymer density profile in the Poiseuille flow and only one peak in the center in the Couette flow, which are in agreement with the previous investigations.

Preparation and Properties of Soluble Polyimide Membranes Containing Polyether Segment for Gas Separation

QIU Xiao-Zhi^1,2, CAO Yi-Ming^1*, WANG Li-Na¹, ZHOU Mei-Qing¹, YUAN Quan¹

2009, 30(1):  196-202.  doi:

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Polyimide copolymers as materials for gas separation containing polyether soft segment were synthesized from 2,2-bis(3,4-dicarboxyphenyl) hexafluoroprophane dianhydride(6FDA) with m-phenylenediamine(mPDA) and polyether diamine by two steps of condensation polymerization. Permeation properties of O₂, N₂, H₂, CH₄ and CO₂ were investigated. The co-polyimides were soluble in common solvents such as NMP and THF. The effects of content and structure of the polyether on permeation properties were studied. It was found that introducing soft polyether segment into polyimide main chain increased the diffusion coefficients due to increasing of chain flexibility, and also increased CO₂ solubility selectivity due to the strong affinity of ether oxide groups with CO₂. The results show that the permeability coefficients of CO₂ for co-polyimides are higher than that for 6FDA-mPDA polyimide; the CO₂/N₂ selectivity is better than CO₂/CH₄; meanwhile, CO₂ permeability coefficients for co-polyimides is higher than H₂.

Effect of Oxalic Acid on Rheological Variation, Thermodynamic Variaton and Formation Kinetics in Asymmetric Membrane Formation

LI Xin^1,2*, CHEN Cui-Xian², LI Ji-Ding²

2009, 30(1):  203-207.  doi:

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The effects of oxalic acid on rheological, thermodynamic and membrane formation kinetics were investigated in polyethersulfone with cardo/oxalic acid(OA)/N,N-dimethylacetamide cast solution. The results show that the addition of OA can work in favor of the enhancement in the demixing of casting solution thermodynamically.The membrane formation kinetics result is different from a commonly accepted conclusion obtained by Strathman et al. that a single linear correlation between square of precipitation front move(L²) and gelation time(t) existed for the whole gelation process. Four different linear correlations between the value of L² and gelation time(t), were identified, these four correlations correspond to four consecutive gelation steps. The maximal gelation rate constant occurred the top layer.

Preparation and Properties of Ampliphilic Polymer Nanospheres Containing Nucleobases

ZHANG Xiao, HE Zhen-Feng, LI Guang-Quan, ZHANG Yu-Jian, CHEN Yun-Xia, LI Guo-Wen^*

2009, 30(1):  208-211.  doi:

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An amphiphilic polymer containing adenine, poly[(polyoxyethylene-600)-oxy-5-[6-(1-adenine) hexyl] isophthaloyl(PPEAHI), was synthesized. The self-organized behavior of the amphiphilic polymer in dilute aqueous solution was studied. The morphology of the aggregates was observed via SEM. The result indicates that the amphiphilic PPEAHI polymer is self-organized into nanospheres in dilute aqueous solution. The molecular recognition between adenine in PPEAHI polymer and thymine substrate was studied via FTIR, which implied that the hydrogen bonds were formed between complemenntary groups. The formation of H-bonds was further confirmed by variable temperature FTIR.

Synthesis and Properties of Novel Temperature-sensitive Self-assemble Nanomicelles of P(NiPAAm-co-DMAA)-co-P(L-Ala)

WANG Hai-Qing, YU Mei, BAO Jun-Bo, SONG Cun-Xian^*

2009, 30(1):  212-214.  doi:

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A novel temperature-sensitive amphiphilic copolymer of P(NiPAAm-co-DMAA) with active —NH₂ group was synthesized by ATRP, which was used as initiator of amino acid polymerization. The PDI of P(NiPAAm-co-DMAA)-co-P(L-Ala) is about 1.3. This polymer could form temperature-sensitive micelle by self-assembly. The diameter and distribution of micelle were observed by TEM. The results show that the siza of micelle is about 200—300 nm and the micelle has obvious core-shell structure. LCST of copolymer is 45.5 ℃. When temperature is under LCST, the copolymer is soluble and form temperature-sensitive micelle. When temperature is above LCST, the micelle dissociate and copolymer is insoluble. Its response to temperature is quickly and reversible.

Synthesis and Properties of Damping Coating Based on Hyperbranched Polyurethane

HAO Ming-Yang, LIANG Hong-Bo^*, GUAN Jing, CHEN Ya-Ming, XIONG Lei, ZHONG Wei

2009, 30(1):  215-220.  doi:

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Hyperbranched polyurethane(HPU) was synthesized from toluene-2,4-diisocyanate(TDI) and diethanolamine(DEOA) by one-step method, which was further modified to prepare UV-curable hyperbranched polyurethane(UV-HPU) and hyperbranched hybrid polyurethane(HHPU). The resins were characterized by Fourior-transformed infrared spectroscopy(FTIR) and ¹H nuclear magnetic resonance(¹H NMR). The results indicate the successful synthesis of the production. Then the resins were used as oligomers to prepare damping coatings. Dynamic mechanical analysis(DMA) results show that the two cured resins of UV-HPU and HHPU have a high loss tangent(tanδ≥1.0), wide ranges of temperature(tanδ≥0.5, 50 ℃) and wide ranges of frequency(20-160 Hz). Thermal gravimetric analysis(TGA) results indicate that HHPU coatings have a higher thermal stability than UV-HPU coatings. The FTIR of the hybrid coatings indicate the hydrolysis and condensation of trimethoxysilane. The Scanning electron microscopy(SEM) photographs of fracture surface of the hybrid material show that the hybrid material presents homogeneous system without obvious inorganic particle forming.

研究快报

Synthesis and Properties of a Chiral Probe Polypyridine with Binaphthyl Moietie

YANG Li-Guo, WANG Yong-Guo, BEN Teng^*, ZHANG Wan-Jin

2009, 30(1):  221-223.  doi:

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A new chiral ionic probe for recognition and detection of Cu(Ⅱ) and Pd(Ⅱ) polymer R-poly-6 having pyridine and binaphthyl moietie was synthesized by the Suzuki cross-coupling reaction, which was characterized with element analysis, IR, ¹H NMR and ¹³C NMR spectroscopies. The CD and UV-Vis absorption spectra of the complexes of R-poly-6 with PdSO₄ and R-poly-6 with CuCl₂ in DMSO at room temperature indicated both Pd²⁺ and Cu²⁺ have the ability to increase the intensity of CD signal around 268 nm. But in the case of Cu²⁺, peak shift was observed. It was considered that the different interaction between the complexation of R-poly-6 with PdSO₄ and the complexation of R-poly-6 with CuCl₂ generated different configuration variation.

Preparation of Aqueous Dispersion and Coating of Bisphenol A-type Poly(ether ether ketone)

JING Li-Wei, GUAN Shao-Wei^*, LIU Bai-Jun, LI Ke-Chang, ZENG Zhi, CHEN Wen-Hui, JIANG Zhen-Hua

2009, 30(1):  224-226.  doi:

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Aimed at making high-performance coatings, the UV-crosslinking behavior of bisphenol A-type poly(ether ether ketone) were studied. A homogeneous aqueous dispersion of this soluble poly(ether ether ketone) was successfully obtained through polymer emulsion formation and then the solvent evaporation. The uniform particles(～150 nm) could be formed when mass fraction of the polymer in chloroform was ranged from 3% to 25%. The coating could be prepared via spray-coating method from above concentrated aqueous dispersion and some processing aids. We found the UV crosslinked layers had better hardness, adhesions and solvent-resistance than the ones without UV irradiation.