bluuebunny/crossref_metadata_2025 huggingface dataset:
Preparation and Photocatalytic Activity of TiO2/FeOOH Nanocomposite
Authors: Chen Dan , Hu Su Juan , Li Guo Hua
Published: June 2012

TiO2/FeOOH nanocomposite was fabricated by a hydrolysis-precipitation approach, using TiCl4 as precursor and FeOOH as support. The crystal phase, diameter and morphology of the sample particle were characterized by X-ray diffraction, transmission electron microscope. The results show that the samples are composed of goethite and rutile. The morphology and diameter of rutile particle, the weight percentages of goethite and rutile, and the microstructure of the samples are related to its preparing temperature and molar ratio of Fe/Ti. The photo-absorption properties of the samples and support were measured by an UV-vis spectroscopy. The results show that the absorption ability of the nanocomposite for visible light is well than that of phase pure rutile. The photocatalytic activity of the nanocomposite as prepared was estimated by degradation of methyl orange (MO) under UV or visible light in an aqueous solution at 303 K. The results indicate that the photocatalytic degradation activity of the nanocomposite for MO is higher than that of phase pure rutile, and the photocatalytic property of the sample is related to its molar ratio of Fe/Ti and preparation temperature. This can be attributed to the microstructure of the nanocomposite, which can improve solar utilization and reduce the recombination rate of solar induced electron-hole pair. This implies that a synergistic effect exists between titania and goethite in the nanocomposite.
Study on Mechanism of Removing the Organic Matter in Heavy Oil Sewage by the Electric Flocculation Method
Authors: Wang Yong , Jie Jie Nian , Li Zhi Yong , Wang Li Guo , Wu Jiang , Tao Ye , You Li Chun
Published: June 2012

Oily sewage is one of the wastes produced in the oil industry production process and its quantity has been increasing year by year, which influences the environment and human health severely. Electric flocculation method is one of the wide application electrochemical treatment technologies for the oily wastewater treatment at home and abroad, which has higher efficiency than other technologies at the aspect of the organic pollutants degradation. A simulative experiment device dealing with heavy oil sewage by the electric flocculation method has been designed in this paper. The mechanism of the electric flocculation method in removing organic matter of the heavy oil sewage by analyzing the change of the composition and content of the organic matter in water samples before and after the process of the electric flocculation has been studied. Research results show: the carbon/tin dioxide electrode is better than the carbon/ ruthenium dioxide electrode in removing organic matter; most alkanes matters in the oily wastewater have been removed in the dispersing oil form by the electric flocculation; as the current density increases, the types and quantity of the response organic matter can be improved while types of the new synthetic organics increase. At the same time, this paper provides a theory support in specific optimization of the electricity flocculation flotation in oily wastewater treatment technology and process.
Preparation of Poly(vinyl Alcohol)(PVA)/peat/clay Composite Beads as Adsorbents for the Removal of Pb (II) and Zn(II) Ions from Aqueous Solutions
Authors: Chan Wu Chung , Cheng Chia Wei
Published: June 2012

A new type of poly(vinyl alcohol)(PVA)/peat/clay composite bead was prepared and shown to be suitable for use as an adsorbent. The mass transport process for the adsorption of metal ions onto the composite beads in an aqueous system was investigated. In the external mass transport process, the rate of ion diffusion decreased and increased with increasing initial metal ion concentrations for Pb+2and Zn+2 ions, respectively. In the intraparticle diffusion process, the diffusion coefficient decreased with increasing initial metal ion concentrations in the range of 1×10-3 to 4×10-3 M, and the diffusion coefficient maintained an almost constant value in the range of 6×10-3 to 22×10-3 M. The rate of ion diffusion within the adsorbent for the Pb+2 ions was faster than that for the Zn+2 ions. The adsorption mechanism was controlled by the intraparticle diffusion process. The maximum amount of adsorbed metal ions at adsorption equilibrium for Pb+2 and Zn+2 ions in this study was 134.57 and 13.28 mg/g composite bead, respectively.
Study on Preparation of Compound Activated Carbon Adsorbent and Effect of Thiophene Adsorption
Authors: Wang Guang Jian , Guo Na Na , Zhang Jian Kang
Published: June 2012

The present work investigated the adsorption of thiophene on activated carbons impregnated with PdCl2 and different kinds of nitrate. The activated carbon was deashed with HCl, oxided with HNO3 and impregnated with PdCl2 and one kind of nitrates in acidic media, followed by drying for 12h and roasting at 350°C under N2 flow. Finally, the model diesel was adsorbed by adsorbent for 12h. They were characterized by N2 adsorption isotherms, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and gas chromatography. Characterization results provided that the active components of PdCl2 and Ni(NO3)2 were effectively supported on the activated carbon. Organic sulfur compounds are preferentially adsorbed and the desulfurization rate is up to 93.05%.
Progress in Modified MBR with TiO2 for Wastewater Reuse
Authors: Chen Xue Dan , Dong Liang Fei , Wei Yong
Published: June 2012

This article summarizes the research situation of wastewater treatment technology with MBR and modified technology of MBR, especially introduces the efficiency of TiO2-modified PVDF membrane. MBR technology has been widely applied for wastewater treatment and reuse, while its development was always restricted by membrane fouling, but modification can effectively enhance hydrophilic and fouling-resistant ability of the membrane. This paper compares several material modification methods for MBR, and analyses the research situations of PVDF modification with several inorganic nano-particle. The modified MBR with nano-TiO2 has attracted many interests of researchers, which will have a better application and development prospect.
Preparation of Nanosized TiO2 Synthesized by Sol-Gel Pathway Using Ionic Liquid as Assistant and its Photocatalytic Activities
Authors: Wei Wei , Yu Chang Shun , Wang Shao Jun , An Qing Da
Published: June 2012

Nanosized TiO2 particles were synthesized by sol-gel method using ionic liquid as assistant. The samples were characterized by UV-vis diffuse reflectance spectra, X-ray diffraction (XRD), transmission electron microscopy (TEM). It was shown that the phase detectable was mainly rutile phase with uniform sphericity and the average size was 10nm. Along with the rise of sintering temperature, grain diameter became bigger. The photocatalytic activities of nanosized TiO2 were evaluated by the reduction yield in the presence of CO2 and water. The result showed that TiO2 catalysts has efficient photocatalytic activities, of which made with [OMIM]BF4 displayed the highest photocatalytic active in the experiment.
Fouling Removal Technology with Intermittent Rotation Spiral-Insert
Authors: Yu Tian Lan , Peng De Qi , Yu Tian Xiang , Deng Bin , Liu Yang Ping , Shi Bing Le , Feng Xiu Yan , Zhang Zhi Kun , Zhi Xiao Heng
Published: June 2012

An intermittent rotation steel spiral automatic cleaning technology has been developed to address the fouling problem of the condenser tubes in small turbines. The intermittent rotation structure reduces steel spiral rotating speed to less than 1/10 of the continuous rotation spiral, which solves the wearing problems between the spiral and the tube. The results of a series of experiments showed that: the proposed technology meets the requirements of cleaning the hard fouling, and the heat transfer enhancement effect is significantly improved. The technology’s simple structure and low cost are suitable for heat exchangers with inside-tube velocity higher than 1 m / s, especially suitable for turbine condenser.
R&D on Wollastonite of Advanced Materials and Low Carbon Products
Authors: Li Ying Jie , Wang Xi Yuan , Xu Xiao Wen
Published: June 2012

This paper proposes a view to develop low carbon products made from synthetic material of wollastonite by means of four-molding, simple-molding method, joint-mold sleeve tube method and extrusion forming through the analysis on the energy consumption in the manufacturing process of traditional fictile. It conducts comparative study on energy consumption and carbon emission of traditional fictile and energy-conserving products made from synthetic material of wollastonite and verifies the applicable value of low-carbon material, which is the basis for its development.
Study on Microstructure Characterization of SiCp/Al Composites
Authors: Li Duo Sheng , Zhou Xian Liang , Zhou Ai Hua , Hua Xiao Zhen , Yu Y.W.
Published: June 2012

ZL101 Al alloy reinforced with 55% silicon carbide particulate metal-matrix SiCp/Al composite has been fabricated by pressureless-infiltration. The microstructure characterization of composite has been studied by optical microscope (OM), scanning electron microscope (SEM), X-ray spectroscopy (EDX), respectively. The results show that the SiCp are uniformly distributed in Al alloy matrix, however, there are some casting defects such as shrinkage and gas porosities in the matrix. When Mg was added into the composite, it can improve wettability property of between Al matrixes and strengthen particle SiCp and decrease micro-defects such as gas porosities, the Microstructure of SiCp/Al composite prepared was compact and uniform. The SiCp particles evenly distributed in the matrix and without significant partial segregation phenomenon. It improves the whole performance of the composites.
Study on Treatment of Waste Emulsion with Pulse-Electrolysis
Authors: Sun Xiao Yan , Qian Ye Wang
Published: June 2012

The waste emulsion after recycling,Which was acted as cooling and lubrication in the mechanicalProcessing,can be discharged when it reaches the goal of envirmental protection.The emulsion contains a large number of surfactants and other additives,so this Emulsifying Wastewater is quite stable.However, There is the higher cost in the existing approach of processing.It was reported that The pulse electrolytic process can be used to carry on the treatment the waste emulsion in the text.So the influence on the waste emulsion chemical oxygen demand(COD) elimination rate effect by the factorsof pulse electrolysis were investigated ,such as the electric current size, width pole plate spacing and pH value. The results shown that the shown that: the electrolytic effect of the acidic and neutral media is better than alkaline conditions, electrode spacing can improve the electrolytic effect, and appropriate duty cycle, pulse frequency can play a pulse, not only enhance the electrolytic effect, but also eliminate the passivation effect; it will be effective to take suitable current density.
Correlation Analysis between Single Nucleotide Polymorphism of Fatty Acid Synthase and Fatness Traits in Chickens
Authors: Wang Yu Xiang
Published: June 2012

The F2 chicken population from China Agricultural University was selected to explore the correlation between single nucleotide polymorphism of fatty acid synthase (FAS) and fatness traits. The primers of FAS gene were designed according to the sequence of chicken fatty acid synthase gene (accession number: J02839). The PCR-SSCP was used for genotype analysis. The results showed that the insertion or deletion of the 41st intron (1418-1424 bp) in chicken FAS gene could result in AA, AB and BB genotypes. In addition, least square analysis revealed that the deletion or mutation insertion of the 41st intron (1418-1424 bp) in FAS gene could affect body weights, abdominal fat weights and abdominal fat ratios of chickens. Therefore, polymorphic loci can be used for marker-assisted selection breeding of chickens.
Study on the Bio-Composite from Sisal Fiber Reinforced Cellulose Acetate
Authors: Jiang Ai Ju , Xu Xiao Qiang , Wu Hong Wu
Published: June 2012

In this paper, sisal fibers (SF) reinforced cellulose acetate composites were prepared using twin-screw extrusion followed by hot-press moulding technology. Both the mechanical properties and the biodegradable rate of the composite were investigated in terms of effect of initial length and mass content percentage of sisal fiber on. The results showed that the fibers tended to be shorter and thinner during the processing of twin-screw blending and the tensile and flexure strength of composites were enhanced, with the content or initial length of sisal fibers increasing. Furthermore, the biodegradation rate of the composite was forward at first, and gradually became slow in later period and then leveled off finally. In addition, Micro-morphologies of the fracture surface of the composite were visualized by scanning electron microscopy (SEM) to analyze the effect of initial length and content of sisal fibers on interfacial adhesion and the distribution of sisal fibers in the composites.
Preparation of Transglutaminase Cross-Linked Tilapia Scale Collagen Microspheres Containing L-Ascorbic Acid
Authors: Li Peng , Shen Xuan Ri , Duan Zhou Wei , Wang Zhang Han
Published: June 2012

With the goal to develop biocompatible material collagen extracted from tilapia scale as coating material to encapsulate bioactive compounds, a microsphere containing L-ascorbic acid as a model is developed, using natural nontoxic transglutaminase (TG) as cross-linking agent. Ultrasonic wave was applied in the process to assist preparing microcapsule. Factors of emulsifier, TG, ratio of L-ascorbic acid and collagen, incubation temperature were discussed. The formulation from orthogonal experiment was of the optimal encapsulation efficiency 81.17%.It is found that the collagen extracted from tilapia scale is a potential biomaterial.
The High-Cell-Density Fermentation of Recombinant Escherichia coli Based on the Control System
Authors: Mu Ting Zhen , Luo Yan E , Fan Dai Di , Guo Lei , Cao Jia
Published: June 2012

Recently fed-batch strategy is well known as the cheapest, simplest and more effective processes. In order to save the manual cost the automatic control strategies have been used in fermentation processes, where the addition of nutrient is added with on-line parameters monitoring. This paper mainly introduces the application of Micro Control Unit （MCU） and Back Propagation （BP）neural networks in the controlling fermentation process.
Sodium Alginate Extraction by Enzyme-Ultrasonic Combined Method
Authors: Lei Yu , Du Bing , Qian Yong Fang , Ye Fang , Zheng Lai Jiu
Published: June 2012

Enzyme-Ultrasonic combined method is researched to extract sodium alginate, and the parameters are optimized as following: enzyme (cellulose and protease add content) 8%(w/v), pH 4, temperature 50°C, ultrasonic power 160 W, enzyme solution time 3.5 h. The FTIR spectrum shows the extraction material is sodium alginate. By the optimum parameters, the extraction rate is 23.1%, which is 27% higher than the traditional methods. Therefore, the extraction of sodium alginate can be increased observably by enzyme-ultrasonic combined method.
Chemical Analysis and Antioxidant Activities In Vitro of Polysaccharide Extracted from Corn Silk
Authors: He Yu Tang , Gao Hong Ni , Xu Yong Xia , Pan Xiao Ming , Li Jian Rong
Published: June 2012

Corn silk polysaccharide (CSP) was investigated for the treatment of different kinds of diseases. In order to characterize the chemical properties and antioxidant activities of CSP, the CSP was isolated from corn silk and purified by DE-52 cellulose column chromatography. Four components were separated, and the highest one named CSP-A. The CSP-A was characterized by FTIR and the monosaccharide components were analyzed by HPLC. The FTIR spectra indicated that CSP-A was characteristic of β-glucosidic bond and α-glycosidic bond. The CSP-A mainly comprised of glucose, galactose, arabinose, mannose, rhamnose. The antioxidant activities of CSP were determined by hydroxyl radical (•OH) and DPPH radicals scavenging assays. When the concentration of CSP was 10mg/mL, the scavenging capacity of •OH and DPPH could reach to 40% and 48%, respectively.
Ionic Liquid-Regenerated Cellulose Beads as Solid Support Matrices for Papain Immobilization
Authors: Yao Song Kun , Li Qiu Jin , Zhang Wei , Gong Ji Xian , Zhang Jian Fei
Published: June 2012

A beads based on cellulose and the room temperature ionic liquid 1-butyl-3-methyl imidazolium chloride ([Bmim]Cl) was prepared. Regenerated cellulose beads were modified with silane, and characterized by scanning electron microscopy. Papain was immobilized on the beads used two different methods including glutaraldehyde and covalent cross-linking method. The immobilized enzyme activity of bead was determinated by BAEE (N-benzoyl- DL-arginine ethyl ester hydrochloride) determination. According to the enzyme activity and immobilization rate compared with covalent cross-linking method, glutaraldehyde cross-linking method is more suitable for amino-modified.
Study on Biocompatibility of Post-Irradiated Silk Fibroin In Vitro
Authors: Jin Huan Yu , Liu Yu , Liu Xing , Wang Da Peng , Liu Jian , Yin Hua , An Yan
Published: June 2012

Because of the good biocompatibility, silk fibroin is widely applied in the biomedical area. However, a few of sensitive persons still have the allergic effect after receiving the recovery treatments involving the silk fibroin used. In present research, we had the SD rat dermal cells cultured on the silk fibroin film (irradiated by gamma ray with the doses of 25kGy and 50kGy) and tested the cell grown curve and proliferation activity of the cells in the silk fibroin extracts from the CCK-8 test kit. The result showed that the cells cultured on the 50kGy-irradiated film grown more quickly than that on the 25kGy-irradiated film and the control. Moreover, cells in the 50kGy-irradiated film extract had the most proliferation activity. In conclusion, the results indicated that the silk fibroin irradiated with higher gamma ray dose could stimulate the cells growth and proliferation.
Effect of Gamma Irradiation on the Biocompatibility and Biodegradation of Silk Fibroin In Vivo
Authors: Jin Huan Yu , Liu Yu , Liu Xing , Wang Da Peng , Liu Jian , Zhang He Mei , Zong Chun Yan , Zhao Hua , Feng Xiao Qing , Yin Hua , An Yan
Published: June 2012

Silk fibroin has been a raw material for many artificial biomaterials for a long term, because of it good mechanical property and fantastic biocompatibility. As a natural protein, it has more excellences than other chemically synthetical materials. In present, silk fibroin is used to manufacture bone repair material, artificial blood vessel, microcapsules and so on. However, silk fibroin-based biomaterial is not good enough in biodegradation. In our research, we exposed the silk fibroin film under the gamma ray irradiation with the doses of 25kGy and 50kGy and implanted the film subsequently on the back of SD rats. At dates (7th, 14th, 28th, 56th, 84th ) after implantation, we got the tissue with the implanted film and had the pathological analysis accordingly. The results show that the immune cells infiltration and inflammation decreased within a month. And the immune reaction decreased more quickly in the 50kGy group. And cracks of the silk fibroin film appeared earlier in the 50kGy group. From above observation, it is indicated that the silk fibroin film with a higher dose had better biocompatibility than others. And the silk biodegradation was accelerated by the higher gamma ray dose. Therefore, we can conclude that the gamma ray is able to improve the biocompatibility of silk fibroin and accelerated the biodegradation of it.
Cellulose/Collagen Beads Prepared Using Ionic Liquid for Cu(II) Adsorption from Aqueous Solutions
Authors: Wang Ji Lei , Li Ming Hui , Wei Li Gang , Ma Ying Chong , Li Kun Lan , Yu Ya Chen
Published: June 2012

Biodegradable cellulose/collagen beads were successfully prepared by coagulating a blend of cellulose and collagen using 1–butyl–3–methylimidazolium chloride ([C4mim]Cl). The copper ions (Cu(II)) adsorption from aqueous solutions using the prepared beads were investigated at 15 °C as a function of initial concentrations, adsorbents types and adsorption time. The results show that Cu(II) adsorption amount increases with increasing initial concentration. Cellulose/collagen beads can absorb more Cu(II) than cellulose beads and the adsorption equilibrium can be achieved at 30 min. The maxinum adsorption amount of the cellulose/collagen beads (1/1, wt/wt) is estimated to be 0.51 mmol/g. The 90% absorbed Cu(II) on the composite beads can be desorbed by treating with 1 mol/L HCl solution for 180 min.
Nanospheres Conjugated with Hab18 as Targeting Carriers for Antitumor Drug
Authors: Chen Tie , Yan Qiu Ping , Li Fu Rong , Tang Shun Qing
Published: June 2012

Doxorubicin(Dox) loaded magnetic alginate nanospheres (DMANs) were prepared in a sodium bis(ethyl hexyl) sulfosuccinate (AOT)/n-hexane reverse microemulsion system, then conjugated with Hab18, a monoclonal antibody by 1-ethyl-3-(3-dimethyl-aminopropyl) carbodi- imidehydrochloride (EDC), as targeting carriers for the antitumor drug. Results of structural analyses showed that DMANs containing 14.6% of Fe, 10.8% of Dox and 65μg antibody per millgram of nanospheres were spherical morphologies with a mean diameter of 185nm in a narrow distribution of sizes. The concentration of alginate, dosages of Dox and Hab18 had significant effects on morphologies and sizes of DMANs. The release time of Dox from DMANs lasted over 15d. By flow cytometer and ELISA experiments, it was disclosed that the immunological activity of the conjugated Hab18 antibody on the DMANs reached 96% of the original one, and DMANs had a good magnetic response and could specifically target to SMMC-7721 tumor cells. These demonstrate that DMANs are hopeful targeting anticancer drug.
Correlation Analysis between Single Nucleotide Polymorphism of the Lipoprotein Lipase and Fatness Traits in Chickens
Authors: Wang Yu Xiang
Published: June 2012

Lipoprotein Lipase plays an important role in adipose functioning signal transduction and it may have direct effects on the deposition of adipose tissues and the body weight ,the Lipoprotein Lipase ( LPL) gene ,therefore ,can be considered as a candidate gene in the study of fat deposition of the chicken. The function of LPL gene has been intensively studied in mammals ,but study of LPLgene in the chicken is still rare. In this paper ,the NEAU divergent selection broiler lines for abdominal fat were used.Body weightand fatness traits were measured in the sixth generation broiler population of the two lines at 7 week of age. One pair of primers for LPL gene were designed according to the database of chicken genomic sequence (Accession No. X60547) . The SNPs Were detected by DNA sequencing ,and PCR-SSCP method was then developed to screen the population. The correlation analysis between the polymorphisms of the LPL gene and growth and fatness traits in the population was carried out using the appropriate statistical model. Three SNPs were found in the population. Those were C235T、C278T and C293T. The least square analysis showed that FF genotype birds had significant higher ( P < 0.05) body weight than EG,FG and GG genotype birds ,and FF genotype birds had significant higher ( P < 0105) weights of abdominal fat than EF,EG and FG genotype birds at the same time. From these results we can putatively drew the conclusion that LPL gene may be a major gene to affect the fatness traits or linked to the major gene ,and the three polymorphisms found in LPL gene could be used to select the chicken for low abdominal fat in molecular marker assisted selection programs.
A Method for the Introduction of Acetylthiol Groups into Recombinant Human-Like Collagen
Authors: Wang Yong Hui , Zhu Chen Hui , Fan Dai Di , Mi Yu , Sun Yan
Published: June 2012

Protected mercaptan groups may be introduced into Human-like collagen (HLC) under very mild conditions with S-acetylmercaptosuccinic anhydride(S-AMSA) as reagent. Fluorometric assay, Fluorescence Spectra and SDS-PAGE were employed to investigate the interaction between HLC and S-AMSA. These results obtained from this study provide theoretical evidence for the further investigate.
Efficient Syntheses of 2-Chloro-2‘-Deoxyadenosine (Cladribine) from 2-Chloroadenosine
Authors: Xu Shao Hong
Published: June 2012

We report efficient syntheses of the clinical agent cladribine (2-chloro-2′-deoxyadenosine, CldAdo), which is the drug of choice against hairy-cell leukemia and other neoplasms, from 2-chloroadenosine. Treatment of 3´, 5´-O-triacetyl-2-chloroadenosine (4) with PTC-Cl and followed by HCO2Na and (Bu4N)2S2O8 gave high yields of the 2´-deoxy-3´,5´-O-triacetyl-2-chloroadenosine which can be converted into target product after convenient deprotection step. This method avoids of using toxic Sn regent which is good for the medical industry production.
Effect of ADM on Proliferation and Apoptosis of Human Gastric Cancer Cell SGC-7901
Authors: Shao Shu Li , Chen Wei Wei , Zhang Wei Wei , Zhao Wei , Li Feng Ying
Published: June 2012

To observe the effect of ADM on cells apoptosis of SGC-7901 cells. The SGC-7901 cells were treated by ADM. And the inhibitory ratio of cells was measured by trypan blue stain assay, the IC50 value was calculated. Cells apoptosis were detected by DNA agarose gel electrophoresis.The cell cycles were analyzed by flow cytometry system after treatment with ADM. Morphologic changes were observed using phase-contrast microscopy . The SGC-7901 cells proliferation were remarkably inhibited by ADM. The IC50 values were 5.7 μg / mL. The typical DNA ladder on agarose gel electrophoresis for analysis of cellular apoptosis were significantly appeared. ADM could restrain the SGC-7901 cells proliferation, and to cause the morphologic changes of apoptosis. Apoptosis peaks appeared with flow cytometry analysis.
Dilute Sulfuric Acid Pretreatment and Enzymatic Hydrolysis of Corn Stover into Fermentable Sugars
Authors: Chen Shang Xing , Yong Qiang , Xu Yong , Yu Shi Yuan
Published: June 2012

The pretreatment of corn stover with dilute sulfuric acid has been investigated by varying the acid concentration (0.5%-1.25%(w/w)) and the temperature (130-160°C). The pretreatment is aimed at improving enzymatic hydrolysis and increasing the fermentability of the biomass. Given the overall sugar yield, the most favourable pretreatment condition was performed with 0.75% sulfuric acid at 150°C for 30min and then with an enzyme loading of cellulase 15 FPU per gram of cellulose, and it resulted in a total of 49.74g glucose and xylose from 100g dry corn stover. The fiber physical feature, structure and property of pretreated residues were studied with Scanning Electron Microscope (SEM) and Fourier transform infrared spectroscopy. The SEM pictures indicated that the biomass structure was deformed and its fibers were exposed by the pretreatment. FTIR study showed that lignin and hemicellulose were partially removed during the diluted sulfuric acid pretreatment.
Synthesis and Electroluminescent Property of Bis{2-(naphtha [3,4]imidazol-2-Yl) Pyridinato} Magnesium
Authors: Yang Shung Jim , Yeh An Chi
Published: June 2012

An emission material, bis{2-(naphtha [3,4]imidazol-2-yl) pyridinato} Magnesium (MgNIP) used for organic light emitting devices, has been synthesized. The decomposition temperature was observed at 510°C and no melting transition (Tm) of MgNIP was observed up to 400°C. The emission spectrum of organic emitting device using MgNIP as emitted layer exhibits a broad maximum at 531 nm. The color of the emitted light is in the orange region in the CIE coordinate of x = 0.46 y = 0.46.
A Novel Approach to Get Bisphenol-a Bis(Diphenyl phosphate)
Authors: Ban Da Ming , Min Yang , Zhang Yong Hang , Zhao Ou
Published: June 2012

A solid phase Bisphenol-A Bis(Diphenyl Phosphate) (BDP) , Poly Phenoxyl Bisphenol-A Phosphate（S-BDP）was synthesized from phenyl dichlorophosphate and bisphenol-A by bulk polymerization. The influence factors on the yield and molecular weight of S-BDP were investigated by the means of orthogonal design. The structure of S-BDP was characterized with Fourier Transform Infrared Spectroscopy (FTIR). The molecular weight was determined by Gel Permeation Chromatography (GPC). Thermal stability of S-BDP was studied by Thermal Gravimetric Analysis (TGA). The results review that S-BDP was synthesized successfully and its structure is similar to BDP. Thermal decomposition temperature is much higher than commercial available flame retardant.
Synthesis and Properties of Silicone Modified Acrylate Emulsion
Authors: Zhang Xia Zhen , Wang Pei , Liu Lian , Xiong Jian Bo
Published: June 2012

Silicone modified acrylate emulsion was successfully synthesized by pre-emulsion polymerization with the monomers of butyl acrylate(BA), methyl methacrylate(MMA), acrylic acid(AA), vinyl triethoxy silane(DB-151) using APS as initiator. The influence of reaction temperature, emulsifier system and silicone concentration on emulsion properties was discussed. The results showed that the overall performances of obtained emulsion became better with the condition: the reaction temperature 75°C, 6%~8% of silicone concentration, and 3% complex emulsifier system consist of the non-ionic /anionic/amphoteric emulsifier. The study also proved that silicone modified acrylic emulsion can improve water resistance and hardness of the resin.
Applied Research of the Flexible Epoxy Resin Curing Agent
Authors: Wang X. , Zheng S. R. , Wang R. M.
Published: June 2012

Epoxy resin structural adhesives modified by flexible curing agent. Dependening on the mechanical properties of epoxy resins on the flexible curing agent content was studied. The impact fracture toughness was discussed in terms of fracture surface fractography.
Impaction of Graphite Type on Performance of Polycrystalline Diamond Powder
Authors: Li Chun Lin , Chen Jian
Published: June 2012

Taking different types of graphite as raw materials ， polycrystalline diamond powder is prepared by shock wave synthesis through copper to absorb and transfer the heat in the article. Yield and abrasion resistance performance are tested, and impaction of graphite crystallite structure on the yield and abrasion resistance performance is researched. As the result, diamond yield and abrasion resistance synthesized from scale graphite is not as good as from earthy graphite. It is easy for polycrystalline diamond powder synthesized from artificial graphite which crystallite has parallel coke-base to graphitize and difficult to get diamond. Yield of artificial graphite which crystallite has disorderly carbon black base is higher than that of earthy graphite, there are more pores for the first baked artificial graphite of carbon black base, the abrasion resistance performance of synthesized diamond is worse than earthy graphite, and the abrasion resistance performance of the second baked polycrystalline diamond powder is better than earthy graphite.
A New Type of Compatilizer and its Application in Polystyrene Ether/Nylon 66 Alloy
Authors: Zhang Ya Tong , Li Ying , Li Li , Qu Xiong Wei
Published: June 2012

This paper studies the influence of Double (L- diethyl tartrate) boric acid ester (compatibilizer B) on the compatibility between PPO and PA66. Through the mechanical properties, Molau experiment, scanning electron microscope and tem analysis test method, it is proved that Double (L- diethyl tartrate) boric acid ester can be used as a new reactive compatibilizer in PPO/PA66 plastic alloy.
Research on the Rheological Properties of Domestic and International PPS Resin
Authors: Zhang Rui Ping , Xiang Peng Wei , Dai Jin Ming , Zhang Jian Ying , Niu Mei , Guo Xue Ping
Published: June 2012

Using the capillary rheometer to study the effect of shear rate, shear stress and temperature of Japanese and domestic PPS resin( fiber grade) on the apparent viscosity, index of non-Newtonian and viscous flow activation energy.The results show that with the increase of shear rate and temperature,compared to the domestic sample, Japanese sample has higher apparent viscosity, smaller non-Newtonian index(n),lower viscous flow activation energy,and smaller sensitivity to temperature.The Japanese specimens are suitable for processing and forming under high shear rate and spinning speed, but the domestic specimens are suitable for processing and froming under low shear rate and spinning speed.
Study of Fibrous AlPO4-5 via Hydrothermal Conditions: Morphology Evolution and Growth Mechanism
Authors: Zhao Chun Xia , Yang Yun Xia , Chen Wen , Webley Paul , Cao Jin Qiao
Published: June 2012

Aluminophosphate molecular sieves (AlPO4-5s) with fibrous morphology were readily prepared via hydrothermal method at 180 °C with the initial molar ratio of Al(OiPr)3: H3PO4: TrPA: HF: H2O as 1: 0.83: 1: 0.8: 70. The morphology and structure of the prepared AlPO4-5s were characterized by XRD, SEM, TEM and nitrogen sorption measurement. The morphology development and structure evolution mechanism were proposed.
Synthesis, Characterized and Biological Activities of Chalcone Derivatives
Authors: Qiu Xiao Yang , Li Su Zhi , Shi An Ran , Yue Qiao Li
Published: June 2012

A series of 4-nitrochalcones (compounds 1-10) are synthesized and characterized. The products synthesized are evaluated for their cytotoxic activities in vitro. Among the compounds tested, (E)-3-(4-nitrophenyl)-1-(4-nitrophenyl)prop-2-en-1-one (1) showes the favorable in vitro cytotoxic activity against human nasopharyngeal epidermoid tumor cell line KB.
Preparation and Characterization of Regenerated Nanocomposite Made from Bacterial Cellulose/PMMA
Authors: Chen Chu Chu , Li Da Gang , Deng Qiao Yun , Wang Yu Mei , Lin Dong Liang
Published: June 2012

Bacterial cellulose (BC)/ Polymethylmethacrylate (PMMA) nanocomposite was prepared by immersing regenerated BC membrane (RBC) in PMMA aqueous solution followed by oven-drying process. The regenerated membrane was obtained through a simple approach by phase inversion method using bacterial cellulose and lithium chloride（LiCl）/dimethylacetamide（DMAc）as solvent. The structure of the membrane was investigated by the scanning electron microscopy (SEM). It shows very smooth, dense and homogeneous surface but owing layer structure. Tensile test results indicate that BC/PMMA nanocomposite has higher tensile strength compared with neat PMMA sheet. After dipping treatment, its light transmission could attaining 89.4%. Consequently, the obtained RBC/PMMA nanocomposite may be potentially used as the substrate of flexible Organic Light Emitting Diode (OLED) and packaging meterials.
Effect of BPR on the Preparation of Nb-Base Powder via Ball Milling
Authors: Zhang De Zhi , Qin Ming Li , Zhang Lin , Lu Xin , Qu Xuan Hui
Published: June 2012

The effect of ball-to-powder weight ratio on the fabrication of Nb-base powder via ball milling was studied. The structural evolution and morphology of the powders were investigated using LPSA, XRD and SEM techniques. The results indicate that increasing the BPR leads to decreases in particle size and grain size of powders. For a given milling time of 18 h and rotational speed of 250 rpm, ball milling with BPR of 20:1 produces an ultrafine powder with a mean particle size of about 2 μm and a grain size of about 20 nm. A 30:1 of BPR increases the useless collision frequency during ball milling, leads to a serious fraying of milling balls.
The Influence of the Viscosity of Edible Ink to Ink-Jet Printing Drop State
Authors: Sun Jing Mei , Wei Xian Fu , Huang Bei Qing
Published: June 2012

Inkjet Printing is a non-contact printing, and it has wide adaptability, high speed and intelligence, low cost and no pollution as well, so it is the best printing form for food and drug surface printing. Drops control technology is the key to the development of ink-jet printing technology, and viscosity is also the key factor that influences the drop state. In this article, the samples which have different viscosity are got by the way of adding different levels of resin to the ink. Drop state is observed through drops observatory, the speed, tail length and volume are measured by it in order to evaluate the influence of viscosity to ink-jet drop state. The result shows that viscosity has big influence to ink-jet drop state, if the viscosity is larger, the speed of drops is smaller. The ink with high viscosity is easier to gather into a circular drop than that with small viscosity. If the viscosity more than 13.2mPa•s, the rupture time and tail length of the drop increases along with the increase of viscosity. When the viscosity is 10.3mPa•s, its rupture time is 80s and the ink soon gather into a circular drop under the action of cohesion, its drop state is the best.
Effects of Supercritical Carbon Dioxide on Interfacial Properties of Carbon Fiber
Authors: Liu Kui , Meng Ling Hui , Zeng Jing Cheng , Feng Xue Bin
Published: June 2012

In this paper , a new treatment method based on polyacrylonitrile (PAN) based carbon fiber treated by supercritical carbon dioxide (SCCO2) is proposed. This method aiming to obtain a controlled interface is green and pollutionless . The surface state of carbon fibers both untreated and treated on different temperature was studied by using SEM, AFM and XPS. The results show that SCCO2 can erode the surface of carbon fibers. Roughness of modified carbon fiber is higher than that of the untreated. Interfacial properties of the treated carbon fiber /epoxy microcomposites were improved. Interfacial shear strength (ILSS) of CFRP shows that treated carbon fiber /epoxy at a lower temperature can be increased by 17.35%, which means that an effect of optimized interface is obtained.
Synergistic Effects of Colour Protective Agent and Modified Atmosphere Packaging on the Preservation of Litchi (Litchi chinensis Sonn.) Fruit
Authors: Yang Sheng Ping , Xie Jing , Qian Yun Fang , Li Nian Wen , Liu Xiao , Zhou Ran
Published: June 2012

The postharvest Litchi (Litchi chinensis Sonn.) fruit was treated with colour protective agent composed of 1% citric acid and 3% NaCl and stored in modified atmosphere (5%CO2/5%O2/90%N2) at (4±1)°C. The anthocycanin, moisture content and the browning index of the pericarp were investigated as factors responsible for the decline of the exterior quality, while the soluble solid content, titratable acidity and the ascorbic acid content of pulp were measured as factors responsible for the decline of the interior quality. The results showed that both the exterior quality and interior quality of Litchi fruit with postharvest treatments were better than that without any treatments. The shelf life of the samples which were dipped in the colour protective agent and packaged in modified atmosphere bags could prolong to 39 days. The good fruit rate was more than 90% with the browning index 1.52.
OD-Characterization of the Symmetric Group S49
Authors: Yan Yan Xiong
Published: June 2012

The degree pattern of a finite group G associated with its prime graph has been introduced in [1] and denoted by D(G). The group G is called k-fold OD-characterizable if there exist exactly k non-isomorphic groups H satisfying conditions |G|=|H| and D(G)=D(H).Moreover, a 1-fold OD-characterizable group is simply called an OD-characterizable group. In this paper, we will show that the symmetric group S49 can be characterized by its order and degree pattern. In fact, the symmetric group S49 is 3-fold OD-characterizable
Preparation of Semisolid Feedstock by Reversed Cone Channel Pouring
Authors: Yang Xiao Rong , Sun Bin Yu , Huang Qing Xue , Mao Wei Min
Published: June 2012

Semisolid A356 alloy feedstock was generated by reversed cone channel pouring. The influence of pouring temperatures and the reversed cone angle on the semisolid microstructure were investigated, and the microstructure of the slurry after soaking was also studied. The results indicate that the suitable pouring temperature for obtaining semisolid feedstock is not above 660°C and the semisolid microstructure can be improved by increasing the reversed cone angle, but proper reversed cone angle should be considered for avoiding solid shell in the condition of big reversed cone angle.
Study of the Nano Material Using Diisopropylamine as Replacing Solvent
Authors: Lin Mei , Peng Hun Yan , Rong Lai , Zhang Ke , Song Shi Yuan , Hu Zhe Shan , Shi Yong Gang
Published: June 2012

The technology of using diisopropylamine as a replaced drying solvent preparing for nano material has been studied．The products of Al（OH）3 and SiO2 are found to be amorphous aerogel
Preparation and Application of Core-Shell PMMA/Chitosan Nanoparticle
Authors: Sha Bi Ying , Liu Qing Shan , Cheng Lin , Yin Xiao Ying
Published: June 2012

Abstract: Objective To separate and enrich compounds from Apocynum venetum L. leaves. Methods The core-shell nanoparticles consisting of poly (methyl methacrylate) (PMMA) cores surrounded by various chitosan shells, induced by a tert-butylhydroperoxide (TBHP) solution. And core-shell nanoparticles was applied to immobilize Alpha glycosidase enzymes. Some compound from the extrat of Apocynum venetum L. leaves were absorbed by the immobilized Alpha glycosidase enzymes. and the components absorbed were detected by HPLC. Results Hyperoside and trifolin can be adsorbed by the nanoparticles immobilized Alpha glycosidase enzymes. Conclusion The method applied to separate and preconcentrate Apocynum leaves’ active ingredients is feasible.
Catalytic Thermal Decomposition of Ammonium Perchlorate Using Cu/Cr Hydrotalcite Derived Nanocomposite Oxides
Authors: Liu Hong Bo , Guo Bing Zhi , Huang Zhi Yong , Xu Hong Hui , Fang Chu Yang , Jiao Qing Ze
Published: June 2012

A series of Cu/Cr nanocomposite oxides (Cu/Cr–NCOs) were prepared by Cu/Cr hydrotalcite precursors. Their catalytic activities on thermal decomposition of ammonium perchlorate (AP) were investigated by differential thermal analysis (DTA). The results show that Cu/Cr–NCOs are efficient in enhancing thermal decomposition of AP. With 4 wt. % addition of 500 °C calcined Cu2Cr–NCOs, the thermal decomposition process of AP can be accelerated by 107 °C. Cu/Cr–NCOs catalysts have better effect compared to mechanical mixture of CuO and Cr2O3 catalyst. Their catalytic mechanism was also discussed.
Synthesis and Characterization of Co-Ce Codoped TiO2/SiO2/NiFe2O4 Magnetic Mesoporous Microspheres
Authors: Ouyang Zhao Hui , Wu Lin , Yi De Lian
Published: June 2012

Polystyrene/SiO2/NiFe2O4 magnetic microspheres were prepared by emulsion polymerization using NiFe2O4 nanoparticles as magnetic carriers, styrene and tetraethoxysilane as raw materials, and 3-Methacryloxypropyltrimethoxysilane as a cross-linking agent. Co-Ce codoped TiO2/SiO2/NiFe2O4 magnetic mesoporous microspheres material were prepared by sol-gel process with tetrabutyl titanate as raw materials，Co and Ce as doping ions, PS-SiO2/NiFe2O4 particles as the cores, sodium dodecyl sulfate and polyvinylpyrrolidone as templates. The crystal structure and surface morphology of Co-Ce Codoped TiO2/SiO2/NiFe2O4 magnetic mesoporous microspheres were characterized by vibrating sample magnetometer(VSM)，X-ray diffraction(XRD)，scanning electron microcopy(SEM)，UV-Vis diffuse reflectance spectroscopy( DRS) and temperature programmed desorption of oxygen(TPD). The results indicated that Co-Ce codoped TiO2/SiO2/NiFe2O4 particles were mesoporous microspheres with core-shell structure. The red shift of the absorption spectrum of Co-Ce codoped TiO2/SiO2/NiFe2O4 was observed by Co-Ce codoping, which enlarge the photoresponse range and surface oxygen storage of TiO2.
Mechanical Behaviors of Sic Particle Reinforced Al Matrix Composites: A Study Based on Finite Element Method
Authors: Sun Chao , Shen Rujuan , Song Min , Du Yong
Published: June 2012

The effects of SiC particle size, volume fraction and tensile strain on the deformation behaviors of SiC particle reinforced Al matrix composites were studied by finite element method using microstructure based model. The results showed that the addition of reinforcements will result in no-uniform stress distribution in matrix. The maximum stress in the particles increases, and the minimum stress in the matrix decreases when the SiC particle volume fraction increases, indicating more load being transferred from matrix to particles with increasing the SiC particle volume fraction. It also showed that as the tensile strain and SiC particle size increase, the maximum stress in the particles increases. It can thus be concluded that small-sized SiC particles can endure more loads and improve the mechanical properties of the composites.
Preparation and Electrochemical Properties of Amorphous Tin-Copper Composite Oxide CuSnO3
Authors: Liu Tao , Du Rong Bin , Kong Xue Jun
Published: June 2012

Composite oxides materials CuSnO3 as anode materials for lithium-ion batteries were synthesized by chemical coprecipitation method using SnCl4•5H2O, NH3•H2O and Cu(NO3)2•3H2O as raw materials.The precursor CuSn(OH)6 and CuSnO3 powders were characterized by thermogravimertric(TG) analysis and differential thermal analysis(DTA), X-ray diffraction(XRD), and transmission electron microscope (TEM). The electrochemical properties of CuSnO3 powders as anode materials of lithium ion batteries were investigated comparatively by galvanostatic charge-discharge experiments. The results show the average particle size of amorphous CuSnO3 is 70nm. The initial capacity during the ﬁrst lithium insertion is 1078 mA•h/g and the reversible charge capacity in first cycle is 775 mA•h/g. After 20 cycles, the charge capacity is 640 mA•h/g and this material shows moderate capacity fading with cycling. As a novel anode material for lithium ion batteries, amorphous CuSnO3 demonstrates a large capacity and a low insertion potential with respect to Li metal.
Investigation on the Large-Scale Synthesis of PbSe Nanocrystals
Authors: Niu Jin Zhong , Tian Gui Min , Cheng Yong Guang , Li Hai Dong , Hao Hao Shan
Published: June 2012

Large-scale synthesis of high quality PbSe nanocrystals was conducted with the one-pot method. By this “greener” synthesis route, the use of traditional dangerous pyrophoric trioctylphosphine (TOP) and tributylphosphine (TBP) reagents was avoided. The crystal size and shape were controlled by the reaction time, reaction temperature, and the use of different combinations of surfactants. X-ray diffraction (XRD) and transition electron microscopy (TEM) were used to characterize as-synthesized nanocrystals and demonstrated the rock salt cubic structures and narrow size distributions. More than 3 g of high quality PbSe nanocrystals were synthesized in one reaction by this large-scale one-pot method. The uniform size of as-synthesized nanocrystals promoted the self-assembly of PbSe nanocrystals into large-area ordered superstructures.
The Analysis of Noises of Flows across the Superhydrophobic Surfaces with Microscale Structures
Authors: Song Dong , Song Bao Wei , Hu Hai Bao
Published: June 2012

Analysis of Superhydrophobic surfaces is a hot topic recently because of its potential use on drag reduction, lower flow noise, self-cleaning. This paper used VOF model and Lighthill's Acoustic Analogy to simulate the sound pressure of channel flow, and found when fluid flowed across channels, the sound pressure caused by superhydrophobic surfaces was much lower than that of plane surfaces. The macroscale structures and the air stored in the cavities could lower the turbulence kinetic energy, and that could be one of the reasons why flow causes lower flow noise across the superhydrophobic channels.
Preparation of CuS Hollow Microsphere by a Simple Hydrothermal Method and its Catalytic Property
Authors: Wang Ming Rui , Li Wen Jiang , Pan Mei Ling
Published: June 2012

A simple method was applied to fabricate phase-pure hollow CuS microspheres. The obtained product was characterized by X-ray diffraction, scanning electron microscopy, photoluminescence spectra and UV-Vis absorption spectroscopy. Further, the catalytic activity of CuS spheres was evaluated by the decolorization of Rhodamine B in the presence of hydrogen peroxide solution at room temperature. The results indicated that the product showed a good optical propertie, and the hollow sphere CuS could be an effective catalytic material.