bluuebunny/crossref_metadata_2025 huggingface dataset:
Water Caltrop Pericarps Extracts Attenuate H2O2-Induced Human Umbilical Vein Endothelial Cell Injury
Authors: Lin Qiu Sheng , Yu Hai Ning , Das Undurti N , Shen Sheng Rong
Published: July 2012

Natural antioxidants could inhibit ROS production and attenuate injury, which is important event of cardiovascular diseases. Water caltrop pericarps from three different Chinese water caltrop cultivars were collected and extracted using 70% methanol and hot water (WCPE). WCPE exhibited strong in vitro antioxidant activities tested by DPPH assay. Incubation with 100μM H2O2 for 1 h would reduce viability of HUVECs to 76.46±0.05%, decrease SOD, CAT and GSH-Px activities to 12.50±0.06, 10.08±0.57 and 107.98±2.68 U/mg protein compared with 20.57±0.02, 22.56±0.41 and 215.28±23.13 U/mg protein of normal cells, increase MDA content from 3.31±0.38 to 9.52±1.87 nmol/mg protein. Pre-treatment, post-treatment and simultaneous with WCPE could attenuate HUVECs injury and recover the viability to 107.77±0.06%, SOD, CAT and GSH-Px activities to 19.11±0.02, 26.14±0.89 and 192.62±7.75 U/mg protein and MDA content to 4.31±0.71 nmol/mg protein. These results suggested that WCPE attenuates H2O2-induced HUVECs injury through promoting proliferation, enhance antioxidant enzymes activities and reduce lipid peroxidation.
Adsorption Behavior of β-Cyclodextrin Polymer to Phenol in Aqueous Solution
Authors: Huang Hui , Wang Jun Wei , Fan Yi Fan , Tao Shi Ying
Published: July 2012

Removal of low concentration of phenol from aqueous solutions through the adsorption process by using crosslinked β-Cyclodextrin polymer (β-CD polymer) was investigated. The effects of contact time, sodium chloride content, contact temperature and initial concentration of phenol in the aqueous on adsorption capacity were evaluated through a series of batch experiments. The results show that β-CD polymer on the adsorption of phenol balanced after 6h. The adsorption process was apparently influenced by sodium chloride content, contact temperature and initial phenol concentration in aqueous solution. The adsorption behavior for phenol of β-CD polymer is fitted into the Freundlich isotherm.
Study on the Synthesis and Resolution of Dl-Ephedrine
Authors: Lin Hong Yan
Published: July 2012

For curing the common cold due to windcold , bosom frowsty cough, feng shui edema, bronchial asthma disease and etc, DL-ephedrine was synthesized by taking α-(Methylamino) propiophenone as the starting material followed reduction reaction. L-(-)-dibenzoyltartaric acid was used to resolve DL-ephedrine to get optically pure isomers D-(-)-ephedrine and L-(+)-ephedrine.Chemical structure was confirmed by IR and optical purify was up to grade.
The Study of Interference with Ruyanneixiao Cream on Hemorheology and Mammary Microcirculation of Mammary Precancer Rats
Authors: Zhang Gui Juan , Li De Hui , Liao Rui , Tan Bi Zhu , Liu Yu Bin , Ma Yi , Zhang Su Yi , Ma Min , Zeng Xiao Ting , Lin Yi Min , Peng Zhuo Long
Published: July 2012

Objective: to probe the interference of Ruyanneixiao cream for hemorheology and mammary microcirculation of mammary precancer rats. Methods: 48 virginal female SD rats were randomly allocated into 6 groups, A: Blank control group (8); B: Mammary precancer model group (8); C: Tamoxifen (TAM) group (8); D: High dose group of Ruyanneixiao cream (8); E: Middle dose group of Ruyanneixiao cream (8); F: Low dose group of Ruyanneixiao cream (8). The changes of hemorheology and mammary microcirculation were recorded when the rats were executed after 60d. Result: compared with the Blank control group, the whole blood viscosity and plasma viscosity of mammary precancer model group was higher (P<0.05) and the perfusion of mammary microcirculation was lower (P<0.01). Compared with mammary precancer model group, the hemorheological parameters and perfusion of mammary microcirculation of each dose group of Ruyanneixiao cream were improved (P<0.05). Conclusion: Ruyanneixiao cream can improve the status of hemorheology, increase the perfusion of mammary microcirculation. And it may be one of mechanism to treat and prevent mammary precancer disease.
Anti-Fibrotic Roles of Oviductus Ranae in Rats with Hepatic Fibrosis
Authors: Li Yan , Hao Feng , Li Xiao Ou , Zhang Lei , Xu Hui Jing , Li Zheng Yi , Hu Xin Hong , Jiang Yong
Published: July 2012

In this paper, we focus on the role of Oviductus ranae in protecting the liver against fibrogenesis caused by chemical model in rats and to further explore the underlying mechanisms. Rat models of experimental hepatic fibrosis were established by injection with carbon tetrachloride (CCl4). Optical injection, the denaturation and necrosis level of hepatocytes and the distribution of collagen fibrosis increased obviously after hypodermic injection of CCl4 for 9 weeks. Electron microscope, the shape and structure of cell organells were destroyed obviously. Fat storing cells and kuppfer.s cells increased. Collagen fibrosis distributed extensively in the model groups. After 8 weeks treated with Oviductus ranae. The pathological changes and the collagen fibrosis related with hepatic fibrosis decreased significantly. Conclusions: Oviductus ranae can decrease the pathological changes of hepatic fibrosis induced by CCl4, and prevent the development of hepatic fibrosis.
The Comparison of Drug Resistance between Western Flower Thrips (WFT) and Thrips Tabaci
Authors: Su Jia , Guo Yu Lei , Ma Xin Gang , Wang Jian Li
Published: July 2012

Leaf dipping method is used in this paper to compare the drug resistance of the invasive species western flower thrips and the native thrips tabaci to 6 kinds of insecticides: phoxim, chlorpyrifos, beta-cypermethrin, spinosad, emamectin-benzoate and avermectin.The results showed that the western flower thrips had a higher drug resistance to phoxim, chlorpyrifos and beta-cypermethrin than thrips tabaci, while beta-cypermethrin and avermectin had a good activity against thrips tabaci. Spinosad had the best control effect, with a concentration of 0.5 mg/L, the corrected mortality of these two thrips reached above 90%.
Preparation of the Intestinal-Lysis and Multi-Probiotics Microcapsule
Authors: Jia Jian Bo , Yang Yong
Published: July 2012

The intestinal-lysis and multi-probiotics microcapsule of L.lactis, L.plantarum and B.bifidum was produced with gelatin and chitosan as wall material by emulsified condensation method. The effects of temperature and the artificial simulation gastric and intestinal juices on the activity of probiotics were investigated. The experimental results show that the storage time of the bacteria was prolonged and the survival rates of the bacteria in the stomach and the intestine were increased by the formation of microcapsule to embed the bacteria, which can play a target action and reduce the production cost.
Evaluation of Anti-Diabetic Activities of Hovenia Dulcis Thunb
Authors: Wu Long Huo , Zhang Jian
Published: July 2012

Hovenia dulcis Thunb, a food supplement and traditional medicine used in East Asia, has been demonstrated to exhibit hepatoprotective, antimicrobial, neuroprotective, and anti-oxidant activities. To evaluate the anti-oxidant activities of H.dulcis in STZ-induced diabetic mice, the different extracting solvents were employed to compare the antioxidant activity by the classical Fenton’s reagent, the concentrations of SOD, MDA, and iNOS in the serum were determined. The results showed that the ethanol (70%) exhibited the most effective antioxidant activity and dose-dependently upregulation of SOD and downregulation of MDA and iNOS significantly in STZ-induced diabetic mice. These indicated that H.dulcis displayed remarkable anti-diabetic activity.
Microencapsulation Exploration of Squalene by Ultrasonic Spraying and Freeze-Drying
Authors: Han Lu Lu , Bi Liang Wu , Zhao Zhen Dong , Xing Ya Li
Published: July 2012

Squalene, a natural antioxidant, was microencapsulated by the method of ultrasonic spraying and freeze-drying using shell materials of gelatin and arabic gum. The suitable condition for ultrasonic emulsification before ultrasonic spraying and freeze-drying was frequency 28 kHz and running time 20 min. The reasonable condition for microencapsulation of squalene by ultrasonic spraying and freeze-drying was gelatin 3.0 %, arabic gum 5.0 %, maltodextrin 6.0 % and sucrose ester 0.9 %. The appearance and size of microcapsules of squalene were measured by scanning electron microscope and metallographic microscope. The microcapsules of squalene were smonth spheres at the diameter of about 10 μm.
Molecularly Imprinted Polymer-Chemiluminescence Sensor Detect Phentolamine in Urine Sample
Authors: Huang Ying , Xiong Yan , Ye Zhong Bin , Zhang Zhu Jun
Published: July 2012

Using methacrylic acid (MAA) as monomer, ethylene glycol dimethacrylate (EGDMA) as cross-linker and phentolamine as template molecule, we synthesized phentolamine–molecularly imprinted polymers (MIP). Using phentolamine–MIP as molecule recognizates, based on the oxidation reaction between KMnO4 and phenolamine in acidic, we set up a flow-injection chemiluminescence (FI-CL) sensor for phentolamine determination. The sensor was fabricated by packing the MIP particles into a V-shape flow cell. Phentolamine could be selectively on-line adsorbed by the MIPs and then sensed by the oxidation reaction between KMnO4 and phenolamine in acidic.The CL intensity was linear to phentolamine concentration in the range from 2.0 ×10−8 to 6.0 ×10−6 g mL−1 and the limit of detection (L.O.D.) was 6.0 ×10−9 g mL−1 (3σ) with the relative standard deviation (R.S.D.) less than 5% (n=11). The sensor showed high selectivity, improved sensitivity and excellent stability and reversibility compared with the CL method without using MIPs. The lifetime of the sensor was investigated and MIPs could be reused for more than 200 times. Using the method to determine phentolamine in human urine, the recoveries of phentolamine is 100.0% to 104.0%, the result is pretty good.
Determination of Enoxacin in Tablet by Flow Injection Chemiluminescence
Authors: Ren Nai Lin , Yang Chi
Published: July 2012

A new flow injection chemiluminescence (CL) method for the determination of Enoxacin（ENX）was described. The method was based on the weak CL reaction of Ce(Ⅳ)-SO32- sensitized by Pr3+- ENX. The relative CL intensity was linear with the concentration of ENX in the range of 3×10-8 g•mL-1~5.0×10-7 g•mL-1. The detection limit is 1.0×10-8 g•mL-1 .The rSuperscript textelative standard deviation (RSD) for the determination of 4.0×10-7 g•mL-1 ENX is 3.5% (n=11). The method has been successfully applied to the analysis of ENX in tablet
Quantitative Analysis of Dimethyl Formamide Residues in Acrylic Fiber by GC
Authors: Fu Tao , Zheng Guo , Zheng Wen Juan , Sun Yu , Li Jia Yin , Hao Ya Ning
Published: July 2012

In this article, acrylic fiber which was from factory production lines was chosen as samples. The method consisted of extraction of Diethyl Formamide (DMF) via using solid-liquid extraction technique and Gas Chromatograph (GC) analysis. DMF in acrylic fiber were extracted by distilled water, separated though DB-17 capillary column and detected by Flame Ionization Detector (FID). By means of external standard method quantitative analysis was accurately investigated. Detection limit was 3 ppm and recovery rate of DMF was in the range of 94% and 98%. These results showed that this test method was of high precision and sensitivity, which achieved the enterprise production requirements.
Determination of Sulfonamides in Milk Samples Based on RAFT Molecularly Imprinted Solid Phase Extraction
Authors: Qiao Feng Xia , Wang Meng Ge
Published: July 2012

Abstract. A novel molecularly imprinted polymer (MIP) with high selectivity for sulfonamides was synthesized using reverisible addition fragmentation chain transfer (RAFT) polymerization technique with 2-cyanoprop-2-yl-dithionaphthalate as RAFT reagent, sulfadimethoxine as template, methacrylic acid (MAA) as functional monomer. The obtained MIP was characterized by static adsorption and the results indicated that the MIPs had high adsorption affinity to sulfonamides. The MIP was sucessfully empolyed as the adsorbtion sorbent of solid phase extraction for enrichment and clean-up four sulfonamides from food samples. Under the optimized conditions, good linearities were ranged from 0.010-10 µg/mL with r2≥0.9991.The recoveries at three spiked levels were ranged from 91.0-110.2% with RSD less than 5.8%.
A Mini Review of Progress in Chemical Probe and Proton Transfer Reactions of Hypocrollins
Authors: Lv Ping , Yang Liu Zhi , Zhang Ying , Tang Feng
Published: July 2012

Hypocrellin have been isolated from S. bambusaicola (which has been commonly used as medicinal fungi under the name of “Zhu Huang” in China for treatment of rheumatism and pneusomia in traditional Chinese medicine). as fungal metabolites which exert photodynamic activity towards bacteria and fungi.and show significant cytotoxicity in the A-549 and HCT-8 solid tumor cells. The number of scientific articles on hypocrellin clinical application as well as basic science, steadily increases in both English language and non-English language literatures. This review article will focus on chemical probe and proton transfer reactions of Hypocrollins published in English language journals.
The Extrapolation Method for Hyper Differential Scanning Calorimetry
Authors: Liu Peng , Gu Cai Qin , Zeng Qing Zhu , Liu Hao Huai
Published: July 2012

In order to eliminate the temperature lag effect and obtain the accurate temperature results from hyper differential scanning calorimetry (Hyper-DSC) operated at high heating rate, an adjustable method, namely “Extrapolation Method”, had been introduced by us in former papers. And in this paper, we wanted to support the accuracy of this method by other instruments. Specifically, the extrapolated glass transition temperatures (Tg, 61.5 °C) of PLA film, which was obtained by Hyper-DSC, was close to the value detected directly by normal DSC (62.0 °C). And the extrapolated Tg of waxy starch film (59.7 °C for 8.7% moisture content, and 57.2 °C for 11.2% moisture content) was close to the values detected by modulated temperature DSC (MT-DSC) (63.6 °C and 56.8 °C correspondingly). Consequently, these experimental results support that the “Extrapolation Method” is a feasible way to eliminate temperature lag effect for Hyper-DSC.
Effects of Montmorillonite and Acrylic Acid on the Superabsorbent Polymer Based on Xanthan
Authors: Huo Xiao Ping , Wang Fang , Deng Deng , Wang Lei
Published: July 2012

Superabsorbent polymers, which have been used for many applicaions, are an important class of polymers. Superabsorbent polymer based on organic montmorillonite (MMT) and xanthan gum(XG) were prepared by by free-radical graft polymerization of aceylic acid on XG in aqueous solution as a free radical initiator, and then organic montmorillonite (OMMT) was introduced as filler into superabsorbent. The effects of montmorillonite and xanthan on the swelling behaviour of the superabsorbent polymer had been studied in detail. Under the optimal synthesis condition, where the temperature was 65°C, the ratio between the AA monomers and XG was m (XG) : m(AA) = 4 : 1, the weight rate of the initiator and the cross-linker were 1.2% and 0.07%, and the neutralization degree of AA was 70%, the product attained the best water absorbency of 882 g/g in distilled water and 107 g/g in 0.9 wt.% NaCl solution.
Treatment of Natural Mordenite with Alkali and the Ammonium Exchange Capacity of the Modified Zeolite
Authors: Wang Yi Fei
Published: July 2012

The natural mordenite was treated hydrothermally with NaOH solutions, either with or without fusion with NaOH powder as pretreatment. Zeolite Na-P and analcime were identified as the reacted products, depending on the reaction conditions. The zeolites were identified by X-raydiffraction, and their cation exchange capacity (CEC) was determined. Zeolite Na-P has higher CEC (338 meq/100g) contrasted with the mordenite (181 meq/100g). Further more, the uptakes of NH4+ onto the zeolites have also been investigated. The Na-P has faster exchange rate, higher exchange amounts and better regeneration ability. The ammonium removal efficiency for the Na-P is above 90% at the ammonium initial concentrations less than 150 mg NH4+/g. It seemed that Na-P was fit for the further treatment of waters polluted with ammonium.
Effect of POE Grafting Degree and Compatibilization on the Properties of PBT/POE Blends
Authors: Guo Jian Bing , Zhang Kai Zhou
Published: July 2012

Poly (ethylene 1-octene) (POE) was functionalized to varying degrees with maleic anhydride (MA) by melt grafting processes. Fourier transform infrared spectra (FT-IR) confirmed that maleic anhydride was successfully grafted onto the POE. The POE-g-MAH elastomers were used to toughen Polybutylene terephthalate(PBT). The mechanical properties, morphology and the dispersal phase size were investigated. Results showed that the grafting degree strongly influenced the morphology, mechanical properties and the dispersal phase size. All results in this paper were consistent, and showed good interaction between POE and PBT, which was proven by the mechanical properties of blends.
Removal of Arsenic Ion from Aquatic Condiment Using Lignin
Authors: Xu Yin Feng , Wan Xiong , OuYang Xiao Kun , Yu Qun Di , Yang Li Ye , Li Wei La
Published: July 2012

Removal of arsenic ion from fish condiment using lignin as adsorbent was investigated. The effects of pH of aquatic condiment solution, temperature, adsorption time, solid to liquid ratio, salt concentration and amino acid concentration on the removal ratio of arsenic ion from aquatic condiment were also studied. Removal ratio of arsenic ion reached 98.65% with pH 2, temperature 40 °C, adsorption time 25 min, solid to liquid ratio 1:70. It was confirmed that lignin can be used to remove arsenic ion from aquatic condiment.
Adsorption Behavior of Organically Modified Bentonite for Acid Brilliant Scarlet GR
Authors: Wang Xi Quan , Gong Xiao Kang , Yu Biao
Published: July 2012

Organically modified bentonite was prepared by using hexadecyl trimethyl ammonium bromide (HDTMA) under ultrasonic conditions in this experiment. The modified bentonite was used to treat the acid brilliant scarlet GR and the adsorption behavior was investigated. The results indicated that the adsorption isotherm data were well fit for the Langmuir isotherm model and the pseudo two-order adsorption kinetics equation has the highest goodness of fit and the best linear correlation.
Identification of Amber and the Copal under Heat Pressurized Process
Authors: Li Hui , Wang Xuan , Zhu Yong , Ren Qin
Published: July 2012

Amber and copal belong to the natural resin, which are similar and transitional in the physical and chemical properties. The artificial heat-pressurized treatment is contributed to the polymerization of the natural copal, and turns into green, yellow-green and deep orange-yellow copal. It is very difficult to identify amber from the heat- pressurized treatment copal only based on the gemological parameters.The thermal behavior of amber and the copal before and after heat-pressurized treatment were analyzed by means of differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy(FTIR) and nuclear magnetic resonance(NMR). The results show that amber exists an evident endothermic peak around 123~132°C, and copal reveals an obvious endothermic peak at about 174~178°C, and the heat pressurized treatment copal occurs a clear exothermic peak around 150~152°C. The differences between endothermic or exothermic transition and peak position reveal occurring thermal oxidation or the bond breaking or the melting, which are of great significance in the identification.
Amplified Spontaneous Emission from the Oriented NK-2014-Doped Nematic Liquid Crystal Layer
Authors: Jin Zhao Hui , Guo Ying , Gao Hua Jing , Kasatani Kazuo
Published: July 2012

Although lasing has been observed in the solid state for numerous organic molecules emitting at visible wavelengths, this is few case in the infrared. We show amplified spontaneous emission (ASE) in the near infrared (913-930 nm) from the layer of a cyanine dye-doped 4-cyano-4'-pentylbiphenyl (5CB) for laser power above 0.08 GW/cm2, the layer was prepared with the solution of 1,1',3,3,3',3'- hexamethyl-4,4',5,5'-di-benzo-2,2'-indotricarbocyanine perchlorate (NK-2014) dissolved in 5CB. Oriented NK-2014 molecules in nematic liquid crystal (NLC) must have very high amplified spontaneous emission efficiency.
Influence of Weaving Parameters on Aging Performance of Polyester Oxford
Authors: Chen Hai Zhen
Published: July 2012

Aging performances of polyester oxford with different weaving parameters were analyzed. Filament fineness and fabric density were key parameters. The filaments’ tensile strength, the characteristic groups on the fiber surface by FTIR and the determination of terminal carboxyl group were tested, and then the changes of characteristic groups were analyzed by internal standard working curve methods. It was resulted that during the former aging, the orientation of fibers were destroyed, meanwhile the ester bonds on carboxyl decreased and ester bonds on (C-O-C) formed, and during the later aging, etching on the surface of fibers made the ester bonds sharp decreasing. Compared with different fineness, thicker fibers with one more stretch process have the higher degree of orientation, and then prolong the aging. Then compared with different fabric density, the higher density can prolong the aging, provided of no frictions harm fibers during weaving.
Application of New Emulsifier on Acrylic Emulsion Polymerization
Authors: Song Shi Gao , Wen Shao Guo , Wang Ji Hu , Shen Yan
Published: July 2012

In this paper, we studied the influence of the amount of alkyl glycosides emulsifier, reaction temperature and the amount of initiator on emulsion polymerization kinetics. The results show that when we apply the new alkyl glycosides emulsifier in acrylic emulsion polymerization, the relationship between polymerization rate Rp and emulsifier concentration [S] is Rp∝[S]0.70 and the correlation coefficient is 0.93; the relationship between polymerization rate Rp and the initiator concentration [I] is Rp∝[I]1.00 and the correlation coefficient is 0.86; the apparent activation energy of polymerization is 32.34KJ/mol and the correlation coefficient is 0.93. We got good results after applying the new type emulsifier in acrylic emulsion polymerization.
Porous Poly(N-Isopropylacrylamide) Gels Frontal Polymerized in Mixed Solvents of Ethanol and Dimethylsulfoxide
Authors: Feng Qiao , Zhao Ya Qi , Chen Xiang
Published: July 2012

The thermo-responsive hydrogels poly(N-isopropylacrylamide) (PNIPAm) were synthesized by frontal polymerization (FP) in dimethylsulfoxide (DMSO) and ethanol mixture. The effects of composition of synthesis-solvent on FP feature and porous morphologies as well as their response behavior of the final products were studied. PNIPAm hydrogel synthesized in mixture exhibited a porous structure, which was responsible for its higher swelling ratio. Moreover, an improvement in swelling capability of the final PNIPAm hydrogel was found when the ethanol content in mixed media was elevated. The approach, frontal polymerization in mixed solvent, reported here provides a promising option to synthesize porous intelligent hydrogels PNIPAm.
Preparation and Characterization of Quaternary Chitosan/sodium Alginate Self-Assembled Microcapsules
Authors: Chen Hui , Wang Xiao Hui , Li Dong , Guo Yan Zhu , Sun Run Cang
Published: July 2012

Biocompatible quaternary chitosan/sodium alginate multilayer microcapsules were prepared by layer-by-layer (LBL) self-assembly on the template of monodispersed melamine formaldehyde resin microspheres (MF). The process of self-assembly was monitored by measuring the surface zeta-potential of colloidal particles. The particle size was determined by digital light scattering (DLS) after each deposition, and the average thickness of monolayer film was revealed to be 3.9 nm. Using rhodamine B-labeled quaternary chitosan as the positive polyelectrolyte and sodium alginate as the negative polyelectrolyte, self-assembled multilayer microcapsules with strong red-light emitting were obtained and observed with fluorescence microscope. The fluorescent microcapsules self-assembled from the biocompatible natural polysaccharides may be potentially applied in drug delivery and fluorescence diagnosis.
Study on the Supramolecular Interaction of Dibenzoyl Peroxide(BPO) and ß-Cyclodextrin(ß-CD) by Spectrophtometry and its Analytical Application
Authors: Xie Hui , Wang Yan Min
Published: July 2012

The supramolecular interaction of BPO and ß-CD has been studied by spectrophtometry. The mechanism of the inclusion was studied. The results showed that ß-CD react with BPO to form a 2:1 or 1:1 host-guest complex.The ß-CD reacts with benzoic acid to form a 1:1 host-guest complex after the BPO was reduced by hydroxyl ammonium chloride.Based on the enhancement of the absorbance of BPO produced through complex formation, a spectrophotometric method for determination BPO in bulk aqueous solution in the presence of ß-CD was developed. A linear relationship between the absorbance and BPO concentration was obtained in the range of 0.2～50 μg.ml-1. The proposed method was used to determine the BPO in the flour with satisfactory results. The principal advantage of the proposed method is its excellent selectivity based on molecule recognition of ß-CD and simple.
Thermal Degradation Behaviors of Poly(Vinyl Chloride)/Halloysite Nanotube Nanocomposites
Authors: Lin Wan Jun , Yi Ai Hua , Zhao Xia
Published: July 2012

Poly (vinyl chloride) (PVC)/halloysite nanotubes (HNTs) nanocomposites had been prepared by melt blending. The heat distortion temperature (HDT) and vicat softening temperature (VST) of nanocomposites increased with increasing HNTs feed content. Cone calorimetry was used to measure the smoke evolution and fire properties. The addition of HNTs leaded to a remarkable reduction in the smoke production rate, the total smoke production and the peak heat release rate.
Synthesis of Dendrimer-Like Polyamidoamine on Silica Gel Surface and their Adsorption Properties for Cr 3+
Authors: Liu Zai Man , Lv Ji Ping , Li Bai Yu , He Nai Pu
Published: July 2012

Amino functional silica gel was synthesized by in-situ hydrolysis method in the present of silane coupling agent. Then dendrimer-like polyamidoamines based on the silica gel surface (PAMAM-SG) were prepared using Micheal addition of the amino and methyl acrylate, and ester-exchange of ethylene diamine and the ester group. The effects of solution pH, concentration and temperature on the adsorption capacity of PAMAM-SG for Cr3+were studied. The optimum pH range is 4.0-7.0. The adsorption rate decreased with increasing the time, but increased with increasing the temperature. The adsorption capacity increased with increase of the concentration until the adsorption reached equilibrium. The adsorption capacity increased with the generations of PAMAM-SG.
Morphology of Polypyrrole Prepared in SDS Solution
Authors: Liu Jun , Li Mei , Ma Hui Rong
Published: July 2012

Polypyrrole (PPy) nanowires and bundles were successfully synthesized by changing the concentration of the monomer in sodium dodecyl sulfate (SDS) solution. The obtained PPy was characterized by SEM, FT-IR and XRD. The results showed that the PPy was amorphous although their morphology was different and some surfactant molecules were doped into the polymer chains as counterions.
Synthesis of Konjac Glucomannan-Graft-Methacrylic Acid Copolymer
Authors: Han Hui Min , Zhang Chi , Xu Jing , Qu Peng , Zhou Ye , Wang Jing
Published: July 2012

Konjac glucomannan is a kind of natural polysaccharides with excellent biocompatibility and biodegradable activities. In this paper, a series of Konjac glucomannan-graft-methacrylic acid copolymers were prepared by the free-radical initiation grafting Konjac Glucomannan (KGM) with methacrylic acid(MA). The reaction conditions such as reaction temperature, KGM and MA ratio and initiator concentration, were investigated, and chemistry of KGM and its MA grafted copolymers were characterized using FTIR.
The Effect of Alkali on Compressive of Metakaolin Based Geopolymeric Cement
Authors: Wang Jing , Zhang Chi , Xu Jing , Qu Peng , Zhou Ye , Han Hui Min
Published: July 2012

In this study, Metakaolin was used as source material, NaOH and sodium silicate were used as alkali activators.Preparation of three sets of geopolymer samples subject different NaOH concentration from 8 to16mol/L. The effect of alkaline concentration on compressive strength was analyzed. NaOH concentrations at 12mol/L and 16mol/L resulted in high 7-day compressive strengths. And the compressive strength of geopolymeric cement reached the maximum when adding 24mL sodium silicate at SiO2:Na2O ratio 3.3.
Study on Adsorption of Methylene Blue by the Montmorillonite/poly(γ-Glutamic Acid) Composite
Authors: Zhang Cai Ning , Wang Xu Man
Published: July 2012

The composite was prepared with montmorillonite (MMT) and poly(γ-glutamic acid) (γ-PGA). Applied the composite as the sorbent, methylene blue as the adsorbate, the influences of the initial concentrations of methylene blue, adsorption time and pH values of the solution on the adsorption capacity of methylene blue by the composite were studied. The experimental results showed that the adsorption capacity of methylene blue by MMT/γ-PGA composite both increased with the increasing of initial concentration of methylene blue and the prolonging of adsorption time, and then approached saturation respectively. The adsorption capacity of methylene blue by MMT/γ-PGA composite increased with the increasing of pH values of methylene blue solution. Meanwhile, the study of adsorption mechanism demonstrated that the adsorption of methylene blue by MMT/γ-PGA composite was Langmuir type, and the adsorption equation wasΓ=0.204c/(1+0.381C).
Study on Influence of Polyethylene Glycol on Dispersion of Pyrite Powder in Aqueous Solution
Authors: Li Dan , Yin Zhou Lan , Chen Qi Yuan
Published: July 2012

The influences of three kinds of polyethylene glycol (PEG), namely PEG-200, PEG-1000 and PEG-20000, on the dispersion stability of pyrite powder in aqueous solution were investigated by spectrophotometry. The results indicated that the stability of pyrite powder dispersed in aqueous solution was remarkably dependent upon the molecular weight and content of PEG, pH value of suspension, and ultrasonication power. Among three kinds of polyethylene glycol, PEG-20000 was the most effective additive to improve the dispersion stability and wettability of pyrite powder in water. When 8% PEG-20000 was employed as the dispersant, the best dispersion stability of pyrite powder in aqueous solution could be obtained under the conditions of pH at 5-6 and 100-W ultrasonication power. The FTIR spectroscopic analysis showed that the adsorption between the polyethylene glycol and pyrite ore powder was formed by hydrogen bonding. The adsorption of polyethylene glycol onto the surface of pyrite powder via hydrogen bonding provided a high degree of steric stabilization, which effectively prohibited the aggregation of pyrite powder, and thus the dispersion stability of as-formed aqueous suspension was promoted.
Electrodeposition of Salicylideneaniline and its Corrosion Behavior
Authors: Zainoldin Zailelah , Harun Mohamad Kamal , Bahron Hadariah , Kassim Karimah
Published: July 2012

Electrodeposition was carried out on mild steel surface in 0.3 M sodium hydroxide solution (70% distilled water: 30% ethanol) containing 0.1 M salicylideneaniline using cyclic voltammetry and chronoamperometry techniques. Both techniques show the formation of the films on the mild steel surface. The corrosion behavior of electrodeposited mild steel was studied using electrochemical impedance spectroscopy (EIS) technique at various immersion times in 0.5 M sodium chloride solution (NaCl). The study indicates that the resistance of mild steel against corrosion increases after being electrodeposited with salicylideneaniline. However the films tend to diminished after 24 hours being immersed in 0.5 M NaCl solution.
High-Temperature Electrochemical Performance of Amorphous Nickel Hydroxide Codoped with Y and Mg
Authors: Liu Chang Jiu , Shang Wei , Chen Shi Juan
Published: July 2012

Amorphous nickel hydroxide codoped with Y and Mg was synthesized by micro-emulsion precipitation method combined with rapid freezing technique. The physical properties and micro-structural features of the prepared sample were characterized and high-temperature electrochemical performance was analyzed by cyclic voltammetry and charge/discharge tests, respectively. The results indicate that this amorphous nickel hydroxide codoped with Y and Mg has more structural defects and better thermal stability, therefore results in a relatively high specific capacity(332.46 mAh•g-1 at a charge/discharge rate of 0.2C) and a high middle discharge voltage of 1.265V at 60°C. Moreover, the Y and Mg codoped amorphous nickel hydroxide exhibits good electrochemical reaction reversibility and structural stability.
Mesomorphism of Hexa-Peri-Hexabenzocoronene Discotic Liquid Crystals with Odd-Carbon Alkyl Chains
Authors: Cheng Rui , Wang Wen Guang , Yang Teng Zhou , Jiang Yu , Pu Jia Ling
Published: July 2012

A new HBC derivative HBC-C17containing 6 odd-carbon alkyl chains surrounding the hexabenzocoronene core was synthesized, and investigated as discotic liquid crystal along with HBC-C13and HBC-C15. The thermal behaviors have been investigated by using differential scanning calorimetry (DSC). And mesomorphic phase behavior of HBC-C17was observed by polarizing optical microscopy (POM). A remarkable variation in the phase transition temperatures was observed for these three HBC derivatives (HBC-C13, HBC-C15and HBC-C17). Moreover, the mesomorphism of these HBC derivatives can be compared with HBC-C12, HBC-C14and other HBCs with even carbon alkyl chains, meanwhile the relationship between the length of substitutes and thermal properties of HBCs is also studied.
Synthesis and Characterization of LiVOPO4 Cathode Material by Solid-State Method
Authors: Tang An Ping , He Ze Qiang , Shen Jie , Xu Guo Rong
Published: July 2012

Lithium vanadyl phosphate (β-LiVOPO4) cathode material for lithium ion batteries was prepared via a novel solid state method. The microstructure and electrochemical properties of the sample were characterized by X-ray diffraction, scanning electron microscopy, galvanostatically discharge/discharge and cyclic voltammetry techniques, respectively. X-ray diffraction patterns showed that β-LiVOPO4 has an orthorhombic structure with space group of Pnma. The discharge capacity of LiVOPO4 sample is 89.9 mAh•g-1 in the first cycle, and in the 50th cycle it is 76.2 mAh•g-1 at the current density of 10 mA•g-1 between 3.0-4.5 V. The chemical diffusion coefficient ( ) value determined from CV is about 10-11 cm2 s-1. Experimental results indicate that further efforts are needed to improve electrochemical performances of LiVOPO4 material synthesized by solid state method; however, it has a higher discharge plateau around 3.9 V.
Comparison of Electrochemical Performance of LiNi0.7Co0.15Mn0.15O2 with Different Surface Composition
Authors: Wang Lei , Li Jian Gang , Chi Na , Yu Hai Ying , Dong Tao
Published: July 2012

The high-capacity cathode materials with the same average composition of Li[Ni0.7Co0.15Mn0.15]O2 but with three different surface composition were prepared. The structural and electrochemical properties of the materials were studied using X-ray diffraction (XRD), scanning electron microscope (SEM), charge–discharge tests and electrochemical impedance spectra (EIS). The results showed that all of the prepared materials have a well-ordering layered single-phase NaFeO2 structure. Among the three samples, Li[(Ni0.8Co0.1Mn0.1)0.66(Ni0.5Co0.25Mn0.25)0.33]O2 exhibit the best electrochemical performance, due to its lower Ni-content on the material surface ensuring a better reduction of the electrolyte decomposition than that of Li[Ni0.7Co0.15Mn0.15]O2, and its structure with a concentration-gradient shell enabling more smooth Li+ diffusion than Li[(Ni0.79Co0.21O2)0.7(Ni0.5Mn0.5)0.3]O2. It presents an initial capacity of 179.6 mAh•g-1 and 99.0% of capacity retention after 25 cycles.
Synthesis of Nonspherical Banana-Like Mesoporous Silica and their Vertically Deposition Assembly
Authors: Shen Shao Dian , Guan Chen Liang , Han Sheng , Ji Qiong , Mao Dong Sen , Lu Guan Zhong
Published: July 2012

Nonspherical mesoporous silica with banana-like morphology has been synthesized successfully through organic-inorganic cooperative interaction by adding the small molecules additives. SEM and TEM image revealed that the silica with banana-like morphology possess hexagonal pore channels and packed parallel to the long axis. XRD further confirmed the high ordered two dimensional (2-D) hexagonal (p6m) mesostructure. N2 adsorption-desorption measurement show that they have high BET surface area and large pore size and pore volume. Impressively, through vertical deposition assembly technique, the anisotropic nonspherical banana-like mesoporous silica can be organized into closely-packed monolayer and multilayer film, demonstrating potential application in photonics, electronics and magnetics.
Synthesis and Dephosphorization of Iron Manganese Composite Oxide by Acid Leaching on Iron Manganese Ore
Authors: Kang Ting Ting , Liu Yi , Huang Yong Bing , Dong Jing , Huang Qian , Li Yu Ying
Published: July 2012

Fe-Mn composite oxide has been successfully synthesized using manganese ore in Guilin, Guangxi as an effective way to dephosphorize by acid leaching. Studied about the optimum conditions of acid leaching and the dephosphorization of Fe-Mn composite oxide. Process of the sulfuric acid concentration 2.1mol/L, solid-liquid ratio 1:4, reaction time 3.5h, the reaction temperature 90°C, the iron leaching rate of 66% while manganese 93%. Adsorption of phosphorus experiments showed that at oxide dosage 0.1000g, the reaction temperature 20°C, the reaction time 60min, pH 3.0, the phosphorus mass concentration 500ug/L in water sample, the phosphorus removal rate was up to 98.65%, compared to 70% removal rate of 0.5000g natural ore. The comparison of adsorption isotherms between Fe-Mn composite oxide and natural ore showed that in above conditions, the oxide's saturation adsorption quantity was 5.0000mg/g, improved 36.99 times.
The Effect of Chromium on the Optical Properties and Photoactivity of Nano-Particulate Rutile
Authors: Wang Li Wei , Egerton Terry A.
Published: July 2012

Chromium doped rutile TiO2was synthesized by either co-precipitation or impregnation (surface-doping) and characterized by XRD and reflectance spectroscopy. Chromium addition did not change the TiO2structure nor did the structure of the co-precipitated products differ from that of the impregnated samples. However, chromium doping moved the absorption of both sets of products into the visible and significantly affected the TiO2photocatalytic activity for isopropanol (IPA) oxidation. At high chromium concentrations the photoactivity of the co-precipitated samples was reduced by a larger amount than that of the impregnated samples; this was attributed to a higher concentration of Cr3+ions in the rutile lattice. Unexpectedly, increased photoactivity was measured for low Cr levels of surface-doped rutile. This may be caused by increased electron-trapping, at surface Cr6+ions, and correspondingly reduced, electron-hole recombination.
Synthesis, Characterization and Conductivity Study of Schiff Base Ligands Derived from Isatin
Authors: Manan Muneera Fatin , Kassim Karimah , Abdul Manan Mohd Abdul Fatah
Published: July 2012

In this study, Schiff base ligands of (E)-3-(2-aminophenylimino)indolin-2-one, (L1); (E)-3-(2-amino-5-nitrophenylimino)indolin-2-one, (L2); and (E)-3-(2-amino-5-chlorophenylimino) indolin-2-one, (L3) were synthesized via condensation reaction of isatin with o-phenylenediamine, 4-nitro-o-phenylenediamine and 4-chloro-o-phenylenediamine respectively. All the synthesized compounds were characterized by various of physicochemical techniques such as melting point, elemental analysis, infrared spectroscopy, and1H nuclear magnetic spectroscopy. Conductivity studies of these ligands were investigated by impedance analyzer which the samples were prepared in the form of tablets. The electrical conductivities of the prepared compounds were measured by applying alternating current (ac) voltage. The conductivity values were calculated and result obtained shows that L2 has the highest conductivity value, followed by L3 and L1.
Synthesis, Structure and Thermal Analysis of Zn(II)-Bi(III) Hetrometallic Complex with Ethylenediaminetetraacetate
Authors: Deng Hong Quan , Jiang Qi Ying , Xu Jian Rong , Hu Ya Min
Published: July 2012

A hetrobimentallic complex of Zn[Bi(edta)]2•8H2O was synthesized under hydrothermal condition and characterized by means of X-ray single crystal diffraction, element analysis, FT-IR spectra and thermal analysis. The complex is monoclinic, space group C2/c with a =2.3532(8) nm, b=0.8675(3) nm, c=1.6116(6) nm, β=98.114(6) °, V=3.2569(19) nm3, Z=4，Dc= 2.455 g•cm－3，μ= 11.615mm－1. Bridging edta4－ anions between Bi(III) atoms result into infinite 1D zigzag chain. [Bi(edta)]－anions and [Zn(H2O)6]2+ cations are bonded through hydrogen bonds to form network structure. The thermal decomposition of the complex proceeds dehydration, pyrolysis of ligand, and decomposition of salt, and the final residue is inorganic oxide. The thermodynamic parameters ( ΔH、ΔG and ΔS) and kinetic parameters (activation energy Ea and the pre-exponential factor A) for the pyrolysis of ligand have been calculated.
Study on Interaction between Cerium and Phosphor in High-Carbon Steel
Authors: Chen Jun Fu , Xie Jun Lin , Wan En Tong , Cao Tong You , Qi Jiang Hua , Sun Wei , Zhu Wan Jun , Fang De
Published: July 2012

This paper did the research on Interaction mechanism between Ce and P added in high-carbon steel.with the use of QUANTA-400 SEM and EDS, the morphology of Ce-P-O inclusions were observed.By the Ce，O，P，S surface scanning observation of the inclusion, the inclusions were sured to be Ce-P or Ce-P-O compounds.furthermore,Ce-P compounds were irregular spherical , mainly in the grain. Ce-P-O compounds were long strip, mainly along the grain boundaries.
Knoevenagel Reactions in Ionic Liquids
Authors: Hu Xiao Mei , Zhao Yang , Gao Yun Fei , Xiao Yi Bo , Zhang Bi Xian
Published: July 2012

Ionic liquids (ILs) as “green solvents” provided an effective and efficient procedure for Knoevenagel condensation reactions. It is applicable for a large range of aldehydes, ketones with active methylene compounds. ILs can significantly promote the reaction rates. High yields and selectivity of products have been observed. ILs can be recycled and reused. In this paper, the recent achievements of Knoevenagel condensation reactions promoted by ILs are reviewed.
Facile Synthesis of Basic Magnesium Carbonate with Different Morphology
Authors: Yang Yun Chuan , Yu Hong Hao , Wang Xin Ying
Published: July 2012

The preparation of different morphological basic magnesium carbonate particles with hollow rod-like, hull of peanut and leaf from the pyrogenation of magnesium carbonate trihydrate were described. The morphology, crystal phase and purity of basic magnesium carbonate were characterized by scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffraction (XRD) and inductively coupled plasma atomic emission spectrometer (ICP-AES). The results indicated that the formation of three morphological basic magnesium carbonates were obtained via platelike particles of magnesium carbonate trihydrate under certain conditions where the temperature and stirring rate were properly controlled. The length of the hollow rod means up to 6～7µm, and its diameter means up to 1～2µm.
The Ultrasonic Wave-Assisted Preparation and Modification by KH-550 of SiO2 Aerogels
Authors: Zheng Wen Zhi , Pan He Chao , Chi Zhen Yue , Chen Hai Jian
Published: July 2012

Under ultrasonic wave and using aminopropyltriethoxysilane as modifier and acid catalyst, hydrophobic SiO2aerogel was prepared through fractional hydrophobic modification and ambient pressure drying of the raw material, tetraethoxysilane (TEOS), in the process of sol-gel and acid-base catalysis.SiO2aerogels were analyzed and compared using scanning electron microscopy, Brunauer-Emmett-Teller analysis method, Fourier transform infrared spectroscopy. The results indicate that modifiering by the ultrasonic wave and aminopropyltriethoxysilane, the temperature tolerance of the SiO2aerogels was 407°C.the specific surface area of the SiO2aerogels was 877.17m2/g. Pore distribution in micro -pore range was 0.5～1nm. Pore distribution in meso -pore range was 1.8～2.5nm. Thermal stability of the hydrophobic SiO2aerogels prepared through fractional modification assisted by the ultrasonic wave method was increased with the hydrophobic angle at160°, which showed super hydrophobicity.
Preparation of Iodide-Thiolate Bridged Binuclear Ni-Ni Complexes via Versatile Reaction of Labile Ni(II)-S(thiolate) Bond
Authors: Wang Qiang , Liu Yang , Gao Wei
Published: July 2012

The reaction between Fe(CO)4I2and Ni(SR)2(dppe) affords NiI2(dppe) due to the nucleophilic attack of iodide on the labile Ni-S(thiolate) bonds. The iodide-dithiolate-bridged binuclear Ni-Ni complexes [(dppe)Ni(µ-I)(µ-pdt)Ni(dppe)]I is readily prepared from the reaction between [NiI2(dppe)] and [Ni(pdt)(dppe)] [dppe = 1,2-bis(diphenyl phosphino)-ethane; pdt = 1,3-propane-dithiolate] in CH2Cl2as a result of attack on Ni-I bond by the lone pairs of electrons on thiolato sulfur donors. The reaction between [FeCp(CO)2I] and [Ni(pdt)(dppe)] in CH2Cl2processes extremely slowly. However, upon metathesis with NH4PF6, the iodide-thiolate bridged binuclear Ni-Ni complexes [(dppe)Ni(µ-I)(µ-pdt)Ni(dppe)]PF6is formed from the reaction of iodide and the Ni(II)-S bonds. The reaction between [NiCl2(dppe)] and NH4PF6and [Ni(pdt)(dppe)] gives a binuclear complex [(dppe)Ni(µ-pdt)Ni(dppe)]PF6without a halide-bridge. These results suggest that the reactivity of Ni-SR bonds in the Ni-thiolate-phosphine complexes is tunable with regard to the electronic environment of second metal ion and the different reactivity of iodide moiety. Electrochemical and crystallographic results are also analyzed for relevant compounds.
Synthesis and Properties of Dendrimer Liquid Crystal Based on Ester and Ether of Gallic Acid
Authors: Zheng Min Yan , Wei Yong Sheng , Gu Yuan Zi , Wang Shan , Guo Nai Ni
Published: July 2012

With gallic acid and n-butanol as main materials, a new dendrimer micromolecular compound with the skeleton of gallic acid was synthesized by reactions of esterification and etherification of gallic acid. The structure of product was detected by elemental analysis, 1H NMR, IR and MS. The target molecule has the structure of alkyl ester and phenoether. The differential scanning calorimeter (DSC) and polarizing optical microscope (POM) measurements showed the target molecular behavior of mesophase and its streak textures belong to nematic. Its temperature range of mesophase was 78 °C during heating process and 58 °C during cooling process. The results showed that dendrimer molecule can formed with the structural unit of gallic acid and it has lower melting point and behaviors of thermotropic liquid crystal.
Sol-Gel Combustion Synthesis of Silica/ Carbon Black Pigment
Authors: Bao Qi Fu , Dong Wei Xia , Chang Qi Bing , Zhou Jian Er
Published: July 2012

A green silicon-containing carbon black pigment was synthesized via a sol-geo combustion technique using TEOS and black ink as raw materials. The obtained black pigment was characterized by XRD, TEM and UV-vis absorption spectrophotometer. The results show that the silicon coated with carbon black pigment can be formed at pH ≥ 2 and the black pigment does not change its color after calcinations at 1300 °C in air implying the carbon black is coated completely with SiO2. When pH is 4, the properties of as-prepared sample are similar with the conventional high-temperature pigment. XRD and SEM further confirm that silicon coats with carbon black fully. The silica/ carbon black pigment may represent an opportunity for the applications in the decoration of the high-temperature ceramic.