bluuebunny/crossref_metadata_2025 huggingface dataset:
Corrosion Behavior of AZ61 Magnesium Alloys in NaCl Solution
Authors: Chai Yue Sheng , Wang Li Na , Sun Gang , Sun Shu Li , Zhang Min Gang
Published: May 2011

Magnesium alloys are used widely because of its good performance. However, its practical application is restricted by low corrosion resistance. In this study, the effects of corrosion time and NaCl concentration on the corrosion behavior of AZ61 magnesium alloy were investigated from the corrosion morphology and the corrosion rate. These results have displayed that the corrosion rate of AZ61 magnesium alloy decreases with the increasing etching time. Meanwhile, the corrosion rate of AZ61 magnesium alloy increases with the increasing sodium chloride concentration. This is mainly because that the Cl- ion in the solution destroys the protective film on the surface of magnesium alloy and the high Cl- ion concentration accelerates the corrosion rate.
The Influence of Heating-Cooling Cycles on the Thermal Storage Performances of Al-17 Wt.% Si Alloy
Authors: Li Feng , Hu Yong Jun , Zhang Ren Yuan
Published: May 2011

The change of thermal properties of Al-17 wt.% Si alloys in different heating-cooling cycles was studied by differential scanning calorimetry (DSC). The influence of heating-cooling cycles on the latent heat of melting was discussed in the view of microstructure of Al-Si alloy. The results showed the latent heat of as-cast Al–13 wt%Si alloy is 548.6 J/g, which Al-Si alloy possesses good thermal energy storage property. The onset of melting point of Al-Si alloy increases indistinctively and is about 577 °C. When the heating-cooling cycle was 1200 times, the latent heat increased to 526.0 J/g. With heating-cooling times increase, the grain size and shape of the primary Si decrease. The shape of eutectic Si is changed into stripe
Yttrium Oxide Luminescence Films Preparated by Electrodeposition- Sinter Method
Authors: Zeng Dong Ming , Yu Jin Gang , Shu Wan Gen
Published: May 2011

Luminescence film material plays a very important role in display technology. In this paper, electrochemical deposition of luminescent Y2O3:Eu or Y2O3:Tb thin films on transparent conducting optically ITO glass substrates by cathodes reduction of yttrium nitric was investigated. Y(OH)3 deposits were obtained using a conventional three electrode cell that potential of work electrode was –1.2v vs. Ag/AgCl electrode for 400 s in a 0.1mol/L Y(NO)3 with 4%(mol/mol) Eu(NO)3 at 65°C.Then this glass was sintered for 2h at 500°C.The luminescence spectrum of the film prepared by this method was tested. Its luminescent spectrum is the same as that of powder which prepared by solid method. Its XRD confirmed the formation of Y2O3 and SEM revealed uniformity of film.
The Continuous Plating of Ni-Cr Composite Coatings and TiO2 Nano-Modify
Authors: Du Deng Xue , Zhang Zhi Peng , Zhou Lei
Published: May 2011

Ni-Cr films were electrodeposited from a nickel sulfate, chromium chloride and chromium sulfate bath. To avoid the poor adhesion and bad surface morphology of the secondary-co-deposition of Ni-Cr alloy films, H2O and DMF (volume ratio as 1:1) is used as solvent. Along with the alloy films growing thick, their surface apertures become larger correspondingly, which causes the hardness and corrosion resistance of the films becoming poor. For comparison, nanocrystalline Ni-Cr films with TiO2 nanoparticles were obtained on the same condition. TiO2 nanoparticles have an average size of 40 nm. The corrosion resistance of the Ni-Cr composite coatings were comparatively evaluated by salt spray test. It is found that the incorporation of TiO2 particles enhances the microhardness and corrosion resistance of the coatings. The reason is that the nano-TiO2 particles in the deposit effectively reduce the size of Ni and Cr crystals through grain refinement-strengthening and dispersion-strengthening effect. The observation results of scanning electron microscopy (SEM) indicated that the Ni-Cr films without dispersions of TiO2 nanoparticles exhibited numerous large and deep crackles, however, the crackles of nano-TiO2 Ni-Cr film distinctly became less.
The Alkaline Activation of Calcium Oxide on Phosphorous Slag Powder Cementing Material in Autoclaved Curing
Authors: Cao Jian Xin , Yang Lin , Lin Qian , Bai Guang Shan , Liu Fei
Published: May 2011

This research attempts to test the mechanical properties of calcium oxide-phosphorous slag powder cementing material under autoclave curing condition. X-ray diffraction, scanning electron microscope-energy dispersion scanner and differential scanning calorimetry-thermogravimetry were adopted to characterize the performance of the hydration products and microstructure of phosphorous slag powder cementing material autoclaved product. The research findings showed that under the condition of autoclave curing, doping calcium oxide would activate preferable property of hydration and hardening of phosphorous slag powder cementing material, and the best strength of the cementing material would be achieved with optimal doping of 15% (in mass) compound calcium oxide. With the effect of the alkaline activation of calcium oxide, there mainly remained the calcium silicate hydrate gel and Al-calcium silicate hydrate in hydration products of phosphorous slag powder cementing material. Excess calcium oxide made alkalinity of calcium silicate hydrate gel change from low to high, thus leading to the decline of mechanical performance of autoclave products.
A Rheological Study of Carbon Black Suspensions and Determination of Significant Factors Affecting the Slip Flow in In-Mold Coating (IMC) Using Design of Experiments
Authors: Aramphongphun Chuckaphun , Chareonwutilap Chompunoot
Published: May 2011

In-mold coating (IMC) of plastic parts is a promising coating process in automotive and consumer products industry. An IMC material, such as carbon black suspension, can potentially be used as a top coat or paint. IMC is performed by injecting a reactive liquid polymer onto a part’s surface in the end of the forming process while the part is still in the mold. The coating material flows under high pressure by compressing the part’s surface, which causes a microchannel of 75-125 micron thickness. The IMC flow, particularly in a microchannel, tends to cause the slip boundary at the channel wall. This research work aims to (i) study rheological properties of carbon black suspended in acrylic resin in both macro- and micro-scale, (ii) study slipping at the wall in the microchannel, and (iii) determine significant factors affecting the slip flow of the carbon black suspension. A custom-built microslit rheometer was developed to conduct experiments to serve these purposes. By analyzing the viscosity data, a slip parameter called slip length could be determined. Statistical design of experiments was then applied to determine the effect of three factors including channel gap, operating temperature, and carbon black content on the slip boundary conditions of the microflow. The results showed that these three factors significantly affected the slip length of the flow of carbon black suspension.
Blank Shape Optimization of Square Cup Deep-Drawing under the Unilateral Constrained Condition
Authors: Tan Li Guang , Xiao Xiao Ting , Huang Li Cheng , Chen Qiao Yu
Published: May 2011

To satisfy the forming need of single-basin with a flange, sensitivity analysis is used to optimize the shape on the basis of the initial shape which gotten by the backward simulation method of analysis software ETA/Dynaform5.5.The optimum blank shape for unilateral constrained square cup deep-drawing is determined, and the optimized results were analyzed and compared before and after. Some measures about blank optimization will be given to such parts.
Non-Linear Methods Could More Accurately Measure Chlorophyll Content in Grape Foliar Non-Destructively with Visible/Red-Infrared Hyperspectral
Authors: Qin Jiang Lin
Published: May 2011

Efficient methods of non-destructively measuring chlorophyll content (Chl) across a wide range of greenness in grape leaves are necessary for a producer to effectively monitor the status of the crop. Wet chemical methods and handheld leaf Chl meters such as the Minolta SPAD-502 Chl meter(Markwell,1995) have traditionally been used for this purpose. Recently, the availability of small and affordable radiometers , which uses Near infra-red and Red edge(CIred edge)( Mark R. Steel, 2008b), for Chl estimation in grapevine leaves, has provided means to estimate Chl from reflectance measurements. The two methods were equally accurate measuring pigments at low to moderate Chl levels. But, when Chl exceeded 300 mg/m2, SPAD sensitivity to Chl declined noticeably and the accuracy of Chl estimation by the CIred edge was much higher than that of the SPAD meter, the chlorophyll index was found to be capable of accurately estimating pigment contents across a much greater Chl range than the SPAD meter. However, in this paper an artificial-intelligence technique, the Support Vector Machine (SVMLightV6.01) model was introduced to establish the relationship between the Chlorophylls content and reflectance of 400-750 nm spectrum, variation of species and growth stages, which can much more perfectly compensated the reflectance that was absorpted by anthocyanin and carotenoids and scatterd because of different leaf thickness, density, or surface properties. As a result that we have solved the problems such as saturation and/or asymptote in high/or lower content of chlorophyll, and SVM model was found to be capable of more accurately estimating pigment contents across a greater range than the SPAD and CIred edge, thus it can be used for quantitative assessment of early stages of pant stress.
Characterization and Evaluation of Binding Properties of Salvianolic Acid a Imprinted Polymers Prepared by Precipitation Polymerization
Authors: Zhu Lin Min , Fu Shao Ping , Li Lin Ying , Zhu Jing Bo
Published: May 2011

Molecularly imprinted polymers (MIPs) were synthesized by precipitation polymerization using salvianolic acid A (Sal A), acrylamide (AA), ethylene glycol dimethacrylate (EGDMA) and acetonitrile as template molecule, functional monomer, cross-linker and solvent, respectively. The morphology of the obtained polymers was characterized by scanning electron microscopy (SEM). The effect of different polymerization conditions (solvent volume, solvent and template amount) on the size and shape of particles was investigated. The binding properties of the imprinted polymers were evaluated through the equilibrium rebinding experiments. Scatchard analysis revealed that two classes of binding sites were formed in the imprinted polymers with equilibrium dissociation constants of 0.33 μmol·mL-1 and 0.07 μmol·mL-1, respectively. Besides Sal A, two structurally related compounds, protocatechuic aldehyde (Pra) and salvianolic acid B (Sal B), were employed for molecular selectivity tests. The results indicated that the imprinted polymers exhibited good selectivity and specificity toward Sal A.
Crack Resistance and Structural Analysis on Thermit Welding
Authors: He Bo , Sun Chang Qing
Published: May 2011

War-broken parts can be repaired quickly without electricity and gas in the wild by use of the thermit welding technology, so it is of great significance to study on welded quality of thermit welding parts for its military application. As the crack resistance of welded parts is an important target to estimate the welded performance, crack resistance test and microstructure analysis have been conducted on test specimens made of Q235 welded parts. Results showed that as the crack ratio was less than 20% in the Y-groove crack test, the crack propagation would not occur in the practical welding structure and that the crack resistance of welded joints could meet the welded demand.
Effect of Fe-Coating on Electromagnetic Performance of Hollow Carbon Fibers
Authors: Xie Wei , Cheng Hai Feng , Kuang Jia Cai , Chu Zeng Yong , Long Chun Guang
Published: May 2011

Hollow carbon fibers were coated with Fe by chemical deposition to improve their electromagnetic performance. A parallel experiment was designed to investigate their chemical reactivity and surface curvature. The microstructure, composition, phase analysis and electromagnetic performance of Fe-coated and uncoated hollow carbon fibers were studied using SEM, EDAX, XRD and vector network analysis. The result indicates that magnetic loss is introduced due to the inherent property of iron. The real and imaginary parts of the complex permeability (μ′ and μ″) of the composites, which consist of the paraffin and the coated fibers after pretreatment and surface activity, are 1.44 and 0.54 at 2 GHz, respectively.
Effect of B Boping Concentration on the Properties of P-Type Hydrogenated Amorphous Silicon Thin Films
Authors: Wang Wei Yuan , Zhao Qing Nan , Yuan Wen Hui , Yang Pu Lei , Liang Hong Yu , Liu Ying , Dong Yu Hong
Published: May 2011

P-type hydrogenated amorphous silicon films were deposited on float glass substrates by plasma enhanced chemical vapor deposition (PECVD). The effect of B doping concentration on the properties of the films was studied. The structure of the films was investigated by X-ray diffraction (XRD). The transmittance of the films was measured using an UV–Vis–NIR spectrophotometer in the wavelength range 200–2600nm.The film thickness was fitted by NKD-7000W optical thin film analysis system. The optical band gap of the films was obtained by the Tauc method. The conductivity of the films was tested by Electrometer Keithley 6517B. The results show that the optical band gap of the films changes from 1.93 eV to 1.65eV with the increase of B doping concentration, the highest conductivity of the film doped with 1.86% B2H6is 7.82 × 10-4S/cm.
Surface Modification of TiO2 Nanopaticles with Good Reflective Properties for Electric Ink
Authors: Wang Deng Wu , Wang Fang , Ma Su De , Miao Zong Cheng , Zhao Xiao Peng
Published: May 2011

To obtain the microencapsulated electric ink with good display properties, the bare TiO2 nanoparticles were modified by stearic acid (SA), and the white encapsulated electric ink was prepared by complex coacervation using Gelatin/gum arabic (GA) as wall materials. The bare and modified TiO2 nanoparitcles were characterized by SEM. Moreover, the fiber-optic spectrometer was also used to measure the reflective properties of the two particles. It was shown that the aggregation phenomena can be greatly decreased by surface modification, and also that the reflective properties can be maintained by this method. Finally, the particles in microcapsules possessed reversible response to dc electric field, and the response time was ~150 ms.
Hydrothermal and Thermal Decomposition Synthesis of Hierarchical NiO Microspheres with Mesoporous Structure
Authors: Liu Hui , Li Guang Jun , Li Jun Qi , Wei Na , Zhu Zhen Feng
Published: May 2011

A facile method has been developed to synthesis hierarchical nickel oxide with spherical particle morphologies, high surface area of 234 m2/g and narrow pore distribution at 3.25 nm by controlled thermal decomposition of the nickel nitrate hydroxide precursors. The as-obtained products were well characterized by XRD, SEM, TEM (HRTEM), SAED, FTIR and N2 adsorption-desorption measurement. It was shown that the hierarchical NiO microsphere with the diameter about 2.0 μm is composed of hexagonal nanoparticles with mesoporous structure. The prepared mesoporous materials were used as an adsorbent to remove the Congo red pollutant contained in the waste water, and they exhibited more favorable adsorptive properties than the mesoporous alumina powders with same surface area due to its special structural features.
Synthesis and Characterization of Magnetic NiFe2O4 Nanosheets
Authors: Cui Zhen Feng , Sun De Hui
Published: May 2011

We have synthesized the magnetic NiFe2O4 nanosheets using a solution method in the presence of hexamethylenetetramine (HMTA). Morphologies, composition and structure of the as-synthesized samples are characterized by field emission scanning electron microscopy (FE-SEM), energy dispersive spectrum (EDS) and X-ray diffraction (XRD), respectively. Fourier transform infrared (FTIR) spectroscopy and vibrating sample magnetometer (VSM) are used to investigate the surface properties and magnetic properties of the NiFe2O4 nanosheets. FE-SEM results show that the NiFe2O4 nanosheet samples have irregular shape with thickness of about 30 nm. XRD result confirms that the samples belong to the cubic crystal system with an inverse-spinel structure. The NiFe2O4 nanosheets possess sub-ferromagnetism with a negligible coercivity and remanence at room temperature. It could become novel magnetic materials with the potential application in sensors, catalyst, and microwave devices.
Synthesis, Crystal Structure, Characterization of a Pb(II) Mixed-Ligand Tetrazolate Complex
Authors: Tang Ji Guang , Liu Xiang Rong , Su Biao , Deng Jun , Wu Yong Ping
Published: May 2011

A homometallic mixed-ligand complex Pb(BTA)(phen)·H2O was synthesized by taking hydrated N,N′-bis(1H-tetrazolyl)amine (H2BTA·H2O), 1,10-phenanthroline (phen) and PbCl2 as starting materials during this work. The complex was characterized by elemental analysis, IR, UV-Vis, FS and X-ray single-crystal diffraction. The results reveal that the coordination number of the Pb ion is four and the geometry can be regarded as a square-pyramidal geometry, with two N atoms of BTA2- and two N atoms of phen at the base. Crystal data for it, C14H11N11OPb, monoclinic, space group C2/c, a = 9.420(2) Å, b = 22.943(6) Å, c = 15.286(4) Å, α = 90.000°, β = 105.760(4)°, γ = 90.000°, V = 3179.6(14) Å3, Z = 8, final R indices [I > 2σ(I)], R1 = 0.0241, wR2 = 0.0471. The thermal stability of the complex was investigated by thermogravimetric analysis. The TG profile indicates that Pb(BTA)(phen) is thermally stable up to the temperature of 588.9 K.
A Dendronized Cellulose Derivative and its Thermotropic Liquid Crystal and Lyotropic Cholesteric Liquid Crystal Behaviors
Authors: Dong Yan Ming , Zhao Ya Qing , Zeng Er Man , Yang Liu Lin , Ge Qiang , Hu Xiao Lan
Published: May 2011

A novel dendronized cellulose，ethyl cellulose grafted 3,4,5-tris[4-(dodecyloxy) benzyloxy] benzoate (EC-g-DOBOB), which is comprised of ethyl cellulose (EC) backbone with mesogenic moiety DOBOB (3,4,5-tris(4-(dodecyloxy)benzyloxy)benzoic acid) dendron grafted, was designed and synthesized. The structure of EC-g-DOBOB was investigated by means of FTIR, Both thermotropic liquid crystal and lyotropic liquid crystal behaviors of EC-g-DOBOB were studied by combination of DSC, POM and XRD. At room temperature EC-g-DOBOB demonstrated hexagonal columnar mesophase (Φh), with the column diameter 5.8 nm, besides it formed lyotropic cholesteric liquid crystal in concentrated chloroform solution with a planar texture.
Preparation and Characterization of Nafion-Zirconia Composite Membrane for PEMFC
Authors: Mokhtaruddin Siti Rahmah , Mohamad Abu Bakar , Shyuan Loh Kee , Kadhum Abdul Amir Hassan , Akhmad Mahreni
Published: May 2011

Polymer electrolyte membrane based on Nafion and zirconium oxide (ZrO2) was developed via film casting method. The content of ZrO2 (1.0, 2.0, and 3.0 wt.%) was incorporated with Nafion solution to prepare Nafion-ZrO2 composite membranes. Recast Nafion membrane was used as reference material. All of the prepared membranes have been subjected to both physical and chemical characterizations such as Fourier transform infra-red (FT-IR), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) analysis, water uptake rate (WUR) and conductivity measurements. The Nafion-ZrO2 composite membranes were found to possess high thermal stability (Tg= 188 - 192°C) and conductivity (0.30 – 0.93 S cm-1). This study demonstrates the possibility of developing Nafion-ZrO2 composite membrane as promising polymer electrolyte membrane for fuel cell operated at medium temperature and low humidity.
Preparation of a New Water-Based Strippable Protected Coating
Authors: Liu Hong Yu , Zhang Song
Published: May 2011

A new water-based strippable protected coating was made by polyurethane emulsion and nano-CaCO3 was put in the coating as the fillers. The influence of nano-CaCO3 on the coating was discussed and the influence of film thickness on the coating was studied. The performance of the coating was tested, and when the dosage of nano-CaCO3 was 2% and the film thickness was 0.13~0.14mm, the film had the best strippable ability. Its average mechanics intensity was 5.72MPa and average elongation at break was 258.35%.
Study on Ce and La Doped 0.85NBT-0.144KBT-0.006BT Lead-Free Piezoelectric Ceramics
Authors: Huang Xin You , Gao Chun Hua , Chen Zhi Gang
Published: May 2011

0.85(Na0.5Bi0.5)TiO3-0.144(K0.5Bi0.5)TiO3-0.006BaTiO3(0.85NBT-0.144KBT-0.006BT) lead-free piezoelectric ceramics was prepared by conventional ceramic technique. The influence of La2O3 doping amount and CeO2 doping amount on properties , crystal structure and surface topography of 0.85NBT-0.144KBT-0.006BT ceramics were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and other analytic methods. It shows that all compositions show the characteristics of pure perovskite structure solid states, La2O3 and CeO2 doping only changes crystal cell dimension rather than crystal structure. The piezoelectric strain constant (d33) starts increasing and then decreasing, the dielectric constant (εT33/ε0) increases, the dielectric loss (tanδ) starts increasing and then decreasing and then increasing while La2O3 doping amount increasing. d33 and εT33/ε0of ceramics starts increasing and then decreasing, tanδ decreases while CeO2 doping amount increasing . When the La2O3 doping amount is up to 0.4 wt.%, the doped samples show good performances with d33=151 pC/N, εT33/ε0=1543 and tanδ=4.3%. When the CeO2 doping amount is 0.1 wt.%, the doped samples show good performances with d33=156 pC/N, εT33/ε0=1364 and tanδ=3.8%. La2O3 doping promotes crystal grain growth, CeO2 doping makes grain crystal size uniform, changes tetragonal into granular structure and restrains crystal grain growth.
Effect of Drying Methods on Structure and Mechanical Properties of Bacterial Cellulose Films
Authors: Zhang Chuan Jie , Wang Liu , Zhao Jin Chao , Zhu Ping
Published: May 2011

Bacterial cellulose (BC) gelatinous films prepared in stationary culture were dried by three different drying methods: hot air drying, vacuum drying and vacuum freezing drying. The structure of dried bacterial cellulose films was characterized using scanning electron microscopy (SEM), infrared spectroscopy (IR) and X-ray diffraction (XRD), and mechanical properties were tested. The results showed that the surface of films prepared by hot air drying were uniform and dense, cavities and cracks configurations existed in vacuum dried films, and layer and porous structures were observed in vacuum freezing dried films. FTIR spectra and X-ray pattern confirmed that vacuum freezing drying reduced the strength of hydrogen bonds between cellulose macromolecules and the degree of crystallinity of BC films but had little influence on the crystal structure. For those reasons, mechanical properties of BC films prepared by vacuum freezing drying were lower than that of those films by other methods.
Analysis of Numerical Simulation in the Deep Drawing of Box-Shaped Parts Using Variable Blank Holder Force
Authors: Chen Kang , Peng Cheng Yun , Zhou Tao , Li Bao Bao
Published: May 2011

Blank holder force of box deep drawing is studied changes with time and displacement by DYNAFORM numerical simulation software. The results shows that, when the straight edge part of the blank holder force is constant, rounded part adopts small blank holder force can significantly improve the forming limit of box deep drawing, but the wrinkle is still evident. If the straight edge and rounded part of the blank holder force changes with time, not only deep drawing limit increase, wrinkles are also significantly reduced, indicating that the forming limit of the box shaped part is more effective on the blank holder force changes over time than with the position variation.
A Study of N Heterocyclic Compound as a Potential Lubricating Oil Additive
Authors: Ouyang Ping , Zhang Xian Ming
Published: May 2011

Lauric acid-N-quinazolin-4-one methylester was synthesized as potential lubricating oil additive. The friction and wear behaviors of the synthesized compound as an additive in liquid paraffin on 12.7mm diameter steel ball bearing specimen were evaluated with a four-ball machine. The worn surfaces of the steel balls were observed using a scanning electron microscopy and X-ray photoelectron spectroscopy. It was found that the novel compound as an additive in liquid paraffin was effective in improving the tribological performance.
Water Permeates in Ceramic Membrane Modified with Nano Inorganic Coating
Authors: Zhou Jian Er , Chang Qi Bing , Dong Ying Chao , Hu Xue Bing , Wang Yong Qing , Hanpshire Stuart
Published: May 2011

Membrane surface modification is the important method to decrease membrane fouling. The hydrophilic modification of ceramic membrane with nano-sized inorganic coating is prepared by the wet chemical methods. The thin nano coating is not a separating top layer but distributes uniformly on the surface of the membrane pore wall. The coating does not change the structure of the membrane pores. Therefore, water flows on not the pore wall but the nano coating surface. The results show that the water flux of the modified membrane is higher than that of the unmodified membrane despite that the mean pore size of the modified membrane decreases. The “boundary slip” is used to explain this special phenomenon. What generates the slippage The slippage is relative with the molecular layer adhered tightly on the hydrophilic pore wall, the roughness and the surface charge of the nano coating, the interaction between the ions in water and the nano coating, et al.
Preparation of Photostable Chlorophyll/PVA Film
Authors: Yang Yu Jie , Hu Bi Ru , Liu Zhi Ming , Wu Wen Jian
Published: May 2011

Based on the principle that chlorophyll’s photodegradation occurs in the presence of oxygen, high-oxygen-barrier polyvinyl alcohol (PVA) films comprising chlorophyll are prepared without photodegradation of chlorophyll by a facile procedure. The photostability of the films are characterized by the absorption spectra. The result shows that the chlorophyll in the films can keep photostable at least for six months whereas the photostability of chlorophyll in ethanol is less than one day. The absorption maxima of chlorophyll/PVA films at red band, which are at 668nm due to the chlorophyll and consist with that of chlorophyll in ethanol (666 nm), shift blue after the sunlight treatment. The shift extent increases with the time of sunlight treatment and decreases with the content of chlorophyll in samples. The method proposed in the study could greatly improve the photostability of chlorophyll and can be used in the field of photocatalysis.
Novel Thermally Stable Epoxy-polyurethane Composites: Preparation, Characterization
Authors: Lin Jing , Yang Qiu Zhuan , Wen Xiu Fang , Cai Zhi Qi , Pi Pi Hui , Cheng Jiang , Yang Zhuo Ru
Published: May 2011

A novel series of hydroxyl terminated bisphenol-A type novolac epoxy resins modified with propionic acid (MEP) were prepared by one-step ring-opening reaction process in the presence of tetramethylammonium bromide catalyst. The obtained MEP was characterized using FTIR, 1HNMR analyses. In addition, Intercross-linked epoxy-polyurethane composites networks were also obtained by curing reaction among MEP, cross linker polyisocyanate IL1351 and phthalic anhydride. The thermal characteristics of the epoxy-polyurethane composites were determined by thermogravimetric analysis (TGA). The thermal stability of the cured MEP with different ring-opening rate and cured alkyd polyol A450 were compared. The results showed that the obtained epoxy-polyurethane composites had much better thermal stability than the conventional polyurethane system A450/IL1351, and the thermal stability of them was correlated to the content of MEP.
Development and Applications on Integrated Multilayer Wrapped Urea Reactor
Authors: Zhu Xiao Qin , Chang Jing Hua , Wang Zhang , Yang Yong , Song Peng Yun , Hu Ming Fu
Published: May 2011

In allusion to the shortage of the traditional multilayer structure of urea reactor, a new type of the integrated multilayer wounded structure with a stainless alloy lining was put forward. The characteristics of this new type of urea reactor structure was recounted, the manufacture and development as well as its main achievements were narrated simply. Moreover, its manufactural process and the examples in engineering applications were introduced, and the reliability and foreground in urea industrial production were also analyzed and forecasted.
Research and Development on Phase Change Energy Storage Exchangers
Authors: Li Ning , Zhu Xiao Qin , Chi Wen , Chang Jing Hua , Gu Hai Ming , Yang Hai Bin
Published: May 2011

Since phase change energy storage exchanger has two functions of heat exchange and heat energy storage, it is an important component of heat energy storage technique with phase change materials, its research has been thought highly by people, and great achievements have been obtained during the recent years. A review on its various structures and their research and development was made in this paper, and its further research and applications were also analyzed and forecasted.
Synthesis and Characterization of 3Y-TZP Powders by Stirring Ball Milling
Authors: Li Da Guang , Wu Zhi , Pan Chun Yang , Fu Wei Qin , Wang Qiu Hong
Published: May 2011

3 mol% yttric(Y2O3)-stabilized tetragonal zirconia ( denoted as: 3Y-TZP) powders were synthesized by the reaction of Zr(CO3)2·nH2O,Y2(C2O4)3·nH2O,H2C2O4·2H2Oand H4C2O2-C2H5OH mixed via stirring ball milling. The curve of decomposition of precursors was studied according to differential thermal analysis and thermogravimetry (DTA-TG). The 3Y-TZP powders were confirmed by characterization of XRD, TEM and BET. These results shown that the size of the 3Y-TZP powders were in the range of about 18nm-28nm with good dispersion and the main phase of target production was tetragonal phase. When calcining temperature and holding time was higher, the size of particles grown up and the tetragonal phase volume fraction decrease gradually. And the calcining temperature has more significant effect.
A Biomimetic Sensor for Fast Lysozyme Detection
Authors: Zhao Wen Tao , Chen Zhen He , Xue Bin , Sun Li Quan , Luo Ai Qin
Published: May 2011

Lysozyme molecularly imprinted polymer membranes(MIMs) were prepared using polyacrylamine as matrix. Direct detection of fluorescence intensity of absorbed lysozyme(Lyz) on the MIMs was achieved for the fast detection of lysozyme. The surface morphology of polymer was characterized by SEM. Adsorption time and rebinding solution pH were optimized to improve recognition ability of MIMs for lysozyme. The results showed that the MIMs had a high selection and recognition ability for the lysozyme protein.
Synthesis、Structure and Catalytic Activity of TiO2/ La2Zr2O7 Nanocomposites
Authors: Tong Yu Ping , Zhao Yu Qing , Huo Hong Yuan , Yang Hui
Published: May 2011

TiO2/La2Zr2O7 composites were fabricated by sol-gel method. The composites were characterized by X-ray powder diffraction (XRD), Raman spectrum, scanning electron microscopy (SEM), energy dispersive X-ray spectrometer (EDS) and Brunauer-Emmett-Teller (BET) nitrogen adsorption. The results showed that TiO2 was uniformly coated on the surface of La2Zr2O7 powders. The BET surface area of TiO2/La2Zr2O7 composites was 26.78 m2/g, which was larger than that of La2Zr2O7. Also, the photodegradation of methyl orange was used to evaluate its photocatalytic property. It was found that TiO2/La2Zr2O7 composites showed good photocatalytic activity and the decomposition of methyl orange had basically completed within 30 min.
Effect of Complex Agents on the Performance of Electrodeposited Ni-Graphite Composites
Authors: He Xiang Zhu , Zhang Xiao Wei , Zhou Xin Li , Wang Yong Xiu
Published: May 2011

Ni-graphite composites were prepared using co-electrodeposited technique in sulfamate bath. To obtain an optimum combination of nickel and graphite in the composites with excellent performance such as wear resistance, corrosion resistance and microhardness and so on, effects of complex agents on the performances of composites were investigated in this work. The obtained Ni-graphite coatings were characterized by means of SEM, EDS and the microhardness measurement, it was revealed that Ni-graphite coating exhibit fine-grained structure with uniform surface and high microhardness values, although some pores and defects were still present in the coating. In addition, the co-electrodeposited Ni-12.16vol% graphite coatings showed considerably better performance, analysis of Tafel curves demonstrated that corrosion resistance of the coating prepared from bath containing complex agents were better than those prepared from bath without complex agents in the NaCl and HCl solution, but worse in the NaOH solution.
Viscoelastic Analysis of the Low-Temperature Anti-Cracking Performance of SBR Modified Asphalt Mixtures
Authors: Zhang Min Jiang , Jiao Xing Hua , Zhang Wen Bo , Zhang Li Ping
Published: May 2011

Asphalt mixture is a kind of typical elastic-viscoplastic material. Environment temperature and loading condition will greatly affect its performance. As the temperature falls, asphalt pavement will engender a shrinkage deformation under the action of temperature stress. When the accumulated temperature stress exceeds tensile strength, the asphalt pavement will be cracked. Based on the results of the bending creep test in low temperature, the Burgers model was established and the viscoelastic parameters in the model were given, and the relaxation modulus of asphalt mixture was also determined in this paper. The study indicated that SBR modified asphalt mixtures have the advantage over common asphalt mixture in low-temperature performance.
A Novel Synthesis Route for Highly Ordered MCM-41 Assembled from Y Zeolite Seed Colloidal and its Performance as the Support for the Catalyst
Authors: Zhang Hai Juan , Wang Wei Qiang , Li Jiang Hong , Zhang Xi Wen
Published: May 2011

A novel synthesis route for a MCM-41 structure with Y zeolite seeds colloidal has been developed. The route is different from conversational method of highly ordered MCM-41 assembled from Y zeolite seed colloidal. The material was characterized by various techniques. The results indicate that the material has well-ordered hexagonal structure, with a thicker wall than that of the sample synthesized by a direct hydrothermal route (N-MCM-41). SEM images show a very uniform net-like morphology, which is different from the loose appearance of N-MCM-41. Furthermore, it has a stronger acid strength and a higher hydrothermal stability. The sample was used as the support of a Pd-Pt catalyst for the polyaromatics hydrogenation. It was demonstrated that the introduction of building units of Y zeolite enhances the activity of polyaromatics hydrogenation. It can be concluded that the pore structure and acidity of support is a key factor for the design of a sulfur tolerant noble metal catalyst for aromatics saturation of diesel.
Luminescent and Thermal Properties of Eu3+ Complex with Salicylic Acid and o-Phenanthroline Trapped in Sol–Gel Glass
Authors: Xu Cun Jin , Lü Qun , Feng Hai Ke
Published: May 2011

A ternary Eu(III) complex with salicylic acid (Hsal) and o-phenanthroline (phen) was synthesized and then incorporated into silica matrix by sol-gel method. The luminescence behavior of the complex in silica gel was studied compared with that of the pure complex by means of emission, excitation spectra and thermogravimetic analysis. The results indicate that the complex Eu(sal)3(phen) in silica gel shows fewer emission lines than pure Eu(sal)3(phen) and the luminescence intensity ratio of the 5D0 → 7F2 transition to the 5D0 → 7F1 transition is lower than that of the latter. The thermal stability of Eu(sal)3(phen) is enhanced greatly through the introduction of the complex into silica matrix.
Reinforcement of Natural Rubber with Quartz/Sericite/Wollastonite
Authors: Guan Jun Fang , Yang Hui Qun , Yu Yan Qiang , Chen Yang , Yang Guo Bing , Gao Hui Min , Zhang Ling Yan
Published: May 2011

In the paper, ultrafine quartz, sericite and wollastonite modified with silane coupling agents KH-570 were incorporated into natural rubber(NR). The synergisitc effect on reinforcing NR caused by the three types of fillers was investigated under a same vulcanizing formulation and process. The mechanical properties and microstructure of the vulcanizates were conducted through mechanical testing and scanning electron microscopy(SEM). The results of mechanical properties tests showed that when one of these three fillers was loaded within NR alone, the tear strength and permanent set of NR vulcanizates filled with quartz could reach 27.61 kN m-1and 16.0%, respectively, stress at 300% elongation of NR vulcanizates filled with sericite could attain 4.69 MPa, and the tensile strength and elongation at break of NR vulcanizates filled with wollastonite could get to16.64 MPa and 951.21%, respectively. Under the condition that the filler loadings were 40 parts per hundred parts of rubber(phr), and the mass ratio of quartz, sericite, wollastonite was 1:1:3, the tensile strength and tear strength could come up to 17.33MPa and 27.54 kN m-1. The mechanical properties of NR composites filled with mixtures were found to be complemented by those three types of minerals. SEM results revealed that the fillers are well dispersed in the rubber matrix in the parallel arrangement with a densest stack, and the synergistic reinforcment effect of the fillers on NR was obvious.
Structural, Optical and Photocatalytic Photodegradation Properties of Zn1−xMnxO Prepared by the Sol-Gel Process
Authors: Men Chuan Ling , Li Hong Qin , Zhang Hua
Published: May 2011

Effect of Mn doping on the structural, photoluminescence and photocatalytic photodegradation properties of Zn1−xMnxO have been studied. The Zn1−xMnxO powders and thin films were synthesized by the sol-gel, spin coating and high temperature annealing processes. The samples were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), photoluminescence and UV-visible (UV-Vis) spectroscopy. XRD analysis showed that Zn1−xMnxO can keep a single phase of wurtzite structure at low Mn doping. UV-Vis spectra of Mn-doped samples showed that Mn doping can enhance the decolorization efficiency of methyl orange at optimal Mn doping levels.
Research Status and Prospects of Surface Nanocrystalline Technology of the Metal Materials
Authors: Sheng Yong Hua
Published: May 2011

The metal materials play important roles in the area of the industry. So it is meanful to use some technologies to improve the comprehensive properties of the metal materials. Comparing with other methods, the surface nanocrystalline technology can improve the strength, the hardness, the abrasive resistance and the corrosion resistance of the metal materials. Besides, through the surface nanocrystalline technology, the grain of the organization can be refined, and the lifespan of the fatigue can be prolonged. So, the surface nanocrystalline technology is with widely market application prospect. At present, there are many studies about the surface nanocrystalline technology, and many typical technologies have been applicated in the industrial production successfully, which satisfy the high requirement of the modern industry in some extent. In this article, the principle, the preparation method and the research status of the surface nanocrystalline technology are produced, and the prospection are made.
A New Tool Wear Modeling Method Based on Project Pursuit Regression
Authors: Guo Qian Jian , He Lei , Zhu Guang Ming
Published: May 2011

Tool wear is a major contributor to the dimensional errors of a workpiece in precision machining. Tool wear modeling is an effective way to predict the tool wear loss in milling process. In this paper, different milling conditions are estimated as the input variables, tool wear loss is estimated as the output variable, and projection pursuit regression (PPR) method is proposed to establish the relationship between the input and the output variables. A real-time tool wear loss estimator is developed based on the PPR model, the experimental and estimated results are found to be in satisfactory agreement with average error lower than 10%.
Synthesis，Film Morphology and Performance on Fabrics of a Novel Amino Functional Polysiloxane
Authors: Huang Liang Xian , Zhang Xi Ya , An Qiu Feng
Published: May 2011

A novel polysiloxane bearing (N,N)-dimethyl-γ-aminopropyl-γ-aminopropyl side groups(ASO-2) was synthesized by copolymerization of octamethylcyclotetrasiloxane with (N,N)-dimethyl-γ-aminopropyl-γ-aminopropyl methyl dimethoxysilane and hexamethyldisiloxane. Chemical structure, film morphology and the softening fabric property of ASO-2 were characterized and investigated by IR, 1H-NMR, SEM, atomic force microscope(AFM) and Kawabata evaluation system(KES).The experiment results indicate that ASO-2 can form a hydrophobic film on both the cotton fiber and silicon wafer surface. The ASO-2 film relatively exhibits a non-homogeneous structure and uneven morphology in its AFM images. Consequently, in 2 μm2 scanning field, the root mean square roughness of ASO-2 film reaches to 0.226 nm, which is 2.69 times rougher as compared with that of N-β-aminoethyl-γ-aminopropyl polysiloxane (ASO-1) film. Application experiments indicate though the tactile of ASO-2 imparted on 100% cotton is somewhat rougher than that of ASO-1, the whiteness and wettability of the cotton treated by ASO-2 are better than those by ASO-1.
Synthesis, Structure and Photoluminescent Properties of Zn(II) -Complex with 2,4,6-tris-(benzimidazolyl-2-yl)pyridine Ligand
Authors: Li Cui Jin , Yin Guo Qiang , Guo Qing Bing , Hang Hong Mei , Zhou Xin Hua , Gong Sheng
Published: May 2011

This hydrothermal reaction of tridentate rigid 2,4,6-tris-(benzimidazolyl-2-yl)pyridine (pytbzim) ligand, linear bridging 4,4′-bipyridine (4,4′-bpy) ligand and Zn(II) salts in acetonitrile and water mixed solvents generates a new complex {[Zn3I6(4,4′-bpy)(pytbzim)3].(H2O)2.(CH3CN)}n. The asymmetry unit of complex contains a [ZnI2(pytbzim)] and a {[Zn2I2(4,4′-bpy)2(pytbzim)2] units, which further construct into a three-dimensional supramolecular networks through p-p stacking interaction and rich hydrogen bonds between units and solvents. The solid state photoluminescence studies reveal good fluorescent properties of the pytbzim ligand and Zn(II)-complex at room temperature.
A Novel Method for Fabrication of the Biomimetic Shark-Skin Coating
Authors: Han Xin , Wang Juan
Published: May 2011

The shark-skin effect motivated from the dermal surface morphology of sharks hastens the imitation and manufacture of the non-smooth drag reduction bionic coating based on shark skin. The fabrication of the bionic shark-skin coating with life-sized scale-like microstructure was presented in this paper. Using hot embossing technology, the direct micro replication of the microstructure on shark skin was investigated for the first time. Modeled after the shark skin sample, the negative structure was directly replicated and printed on PMMA flat plate in the hot embossing process, relied on which the bionic shark-skin coating made of silica gel was fabricated in the end. The preliminary experiment results indicate that this method is a high precision, high throughput, high efficiency and low cost way to fabricate bionic microstructure in micron and submicron scale with good repeatability and availability.
Study on the Magnetorheological Effect of MR Elastomer under Shear-compression Mode
Authors: Wang Yu Fei , He Lin , Yu Wei Xiong , Yang Xue
Published: May 2011

Magnetorheological elastomers are a new kind of MR materials, which consist of magnetizable particles and elastomers. Because of the controllable orheological properties, the materials show a widely prospect in engineering application. In this paper, the magnetic-induced modulus under shear-compression mode was studied. Based on the modulus, the relative MR effect and its influence factor were systematically analyzed. The results show that the relative MR effect will increase with the increasing volume fraction of magnetizable particles, the exterior magnetic field strength and compression strain, and decrease with the increasing shear strain and modulus of matrix. For the study of the relative MR effect, it will give useful advices for the design of MR materials and MR devices.
White Organic Light Emitting Devices Based on the New Hole Injection Material MeO-TAD
Authors: Gao Yong Hui , Jiang Wen Long
Published: May 2011

White organic light emitting devices with the structure of ITO/ MeO-TAD (15 nm) /NPBX(40 nm) /DPVBi(x nm)/ Rubrene(0.3 nm)/DPVBi (20-x) nm /BCP(5 nm) / Alq3 (30 nm) /LiF(0.5 nm) /Al. High-mobility MeO-TAD is added into the region between ITO and NPBX to increase hole injection and transport. The BCP layer was used as the hole blocking layer .In the meanwhile, an effective carrier balance (number of holes is equal to number of electrons) between holes and electrons is considered to be one of the most important factors for improving OLEDs. During the experiment, by modulating the thickness of DPVBi , we can control hole injection and electrons transport to make the carriers reach a high-level balance. The maximum current efﬁciency was 1.22 cd/A.
Magnetic Properties of Mn/Co/Sn Substituted Barium Hexaferrites Synthesized by an Improved Co-Precipitation Method
Authors: Liu Yue , Zhang Hong Bo , Duan Ji Dong , Liu Ying , Gao Yu , Wang Li Li , Li Yang
Published: May 2011

BaFe12-2xMnx/2Cox/2SnxO19 was synthesized by an improved co-precipitation method. Magnetic Properties of the products were characterised.
Preparation of Homogeneous Carbon Nano Particles Using Zeolite
Authors: Yao Yan Li , Du Yu Jie , Yi Hou Hui
Published: May 2011

Homogeneous carbon nanoparticles were synthesized by chemical vapor deposition (CVD) from acetylene with zeolite as template in an atmosphere of argon. The microstructure of the products was characterized by field-emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD). The results showed that the as-synthesized products were quasi-spherical carbon nanoparticles with diameter of ca.150 nm and the interplanar distance of 0.3477 nm, and their purity was above 90%. The thermal stability of carbon nanoparticles was relatively stable. They can maintain their structure over 600°C in air or over 1000°C in argon atmosphere. In addition the formation mechanism of carbon nanoparticles was discussed briefly. Carbon source firstly filled into the template, then pyrolyzed and finally took the form of the product in consequence of template deformation.
Facile Synthesis of Multifunctional Nanocomposites with Tunable Luminescent and Magnetic Properties
Authors: Jia Guang , Zhang Cui Miao , Ding Shi Wen , Yin Ke Wei , Cao Xiao Gang , Song Xing Bang
Published: May 2011

A facile homogenous precipitation method has been developed for the synthesis of multifunctional, luminescent, and magnetic nanocomposites with Fe2O3 nanospheres as the core and europium-doped yttrium oxide (Y2O3:Eu3+) as the shell. The nanocomposites show both ferromagnetic behavior and excellent fluorescence properties with high emission intensity. The luminescent and magnetic properties of the multifunctional nanocomposites can be easily tuned by changing the synthesis conditions, which may find potential applications in biological fields.