bluuebunny/crossref_metadata_2025 huggingface dataset:
Optimization of Alternative Aggregates Based on Fluid Combustion Fly Ashes
Authors: Kratochvíl Jiří , Kalousová Hana , Opravil Tomáš
Published: April 2016

Effective usage of fluidized bed combustion fly ash is very low. These valuable resources are mostly deposited or in the best case used as a filler in excavated areas. Only very small amount is used differently. This paper presents one of the possibilities of usage of these interesting secondary resources. The goal of this paper is to investigate possibilities of preparation of alternative aggregate based on fluid combustion fly ashes. The work is focused on the study of mechanical properties of prepared aggregates. Monitoring of other properties including impact of the quality of fly ash in time, which has been stabilized as far as possible in recent years, will be addressed in the following work.
Functional Cereal-Derived Biomaterials Enriched with Lipophilic Compounds Prepared by Fungal Solid-State Fermentations
Authors: Čertík Milan , Klempová Tatiana
Published: April 2016

Cereals as one of the main component in human diet and feed industry are important sources of several macronutrients (proteins, carbohydrates) and micronutrients (minerals, vitamins). However, their nutritional and functional properties and subsequent applications could be improved significantly by solid state fermentations. During this biotechnological process suitable filamentous fungi efficiently utilize cereals and convert them to new prefermented biomaterials with a high content of valuable metabolites such as polyunsaturated fatty acids, carotenoids, ergosterol, coenzyme Q10, dietary fibers and various enzymes. Fungi also improved content of dry matter, proteins, detergent fibers and ash in biomaterials. These functional biomaterials should be generally recognized as safe for the production of food or feed ingredients/additives. Thus, biotechnologically modified agromaterials may open novel prospects for the market of functional cereal-based food and feed supplements.
Research on the Raman Spectrum of the MPCVD Diamond Films
Authors: Wang Wen Jing , Li Xing Yuan , Zhang Hong Mei , Ding Xi Feng , Sun Xin
Published: April 2016

This research took CH4 and H2 as the air source and sufficiently utilized the diamond films generated on the Si piece due to the microwave plasma chemical vapor deposition (MPCVD) method. Raman spectrum functioned as the key method to investigate the diamond films in such research. The diamond phase, large graphite monocrystals and the disorderly graphite in the films were related respectively to different Raman characteristic peaks. An analysis and related investigation on the Raman spectrum of the sample revealed the performance parameters of the structure, purity and stress of the diamond films in different concentrations of the air source.
Study of Pre-Dispersive Technology of Brucite Fiber and the Composite Insulation Board
Authors: Wang Zheng , Yu Ping , Lu Shuang
Published: April 2016

This paper has compared different kinds of dispersive technologies for brucite fiber mineral, and researched the industrial application of composite insulation board. Compared with the ball-milling treatment and the ultrasonic disperser craft techniques, the high speed mechanical stirring is preferential. The dispersive degree of three dispersants shows a trend as OT > FDN > PCA ®(IV), and the system of suspension with OT penetrant is stable under the designed ratios. The optimal fabrication progress is as the ratio of water and fiber is 18:1, the dosage of OT is 15 wt.% of brucite fiber, the stirring time is 60 min, and the stirring speed is 1200 r/min. Whit the appropriate dosage of brucite fiber (down to 15 wt.% of total fibers mass ) can improve the pore structure of the insulation board, which is benefit to the thermal insulation properties. The results revealed that the brucite fiber could partially replace chrysotile fibers in the composition of insulation board.
A Novel Approach on Preparation and Characterization of Thermosetting Fluorinated Polyurethane Coatings
Authors: Wang Xia , Hu Jiao Jiao , Li Ying
Published: April 2016

Thermosetting fluorinated polyurethane coating was prepared by using fluorinated polyether polyol (FPO) as the soft segment, 4,4`-diphenylmethane diisocyanate (MDI) as the hard segment, TEA as crosslinking agent. The structure ofthermosetting fluorinated polyurethane coating was confirmed by the use of Fourier transform infrared spectroscopy (FTIR).The FPU film’s surface property was investigated by contact angle (CA),water resistance and anti-corrosion resistance measurements. The results indicated that the surface of fluorinated polyurethanes was significantly enriched with fluorine groups. The water resistance of thermosetting FPU coating was evidently better than thermoplastic FPU coating. It was also found that the surface enrichment of fluorine atoms made the fluorinated polyurethane coating had outstanding anti-corrosion resistance.
Preparation of CPC-Fe3O4-MMT/PEG Magnetic Films via Layer-by-Layer Assembly under the Assistance of Magnetic Field
Authors: Xu Li Nan , Tu Shu Chen , Lv Feng Zhu , An Qi , Zhang Yi He
Published: April 2016

Polyethylene glycol (PEG), which was not a traditional building block of layer by layer (LBL) self-assembly, was used to fabricate multilayer films by the combination of LBL and magnetic field induction. The UV-abs absorbance of the composite films increases linearly with the number of bilayers, indicating uniform fabrication of each layer. By this method, the multilayers can consist of up to 15 bilayers. The applied magnetic field not only enhances the compactness of the CPC-Fe3O4-MMT, but also improves the deposition efficiency of the films. The present method can be an effective method for multilayer film fabrication from non polyelectrolyte.
Study on the Preparation of PAMAS/PEO Fibrous Membranes by Electrospinning
Authors: Zhou Hai Jun , Zhang Ting Ting , Zhang Yu , Zhang Jiao Xia , Guo Wei Jie
Published: April 2016

Poly (aniline-co-2-methoxy aniline-5-sulfonic acid) (PAMAS) was synthesized by an oxidative polymerization in this paper. The resulted copolymer was characterized by Fourier transform infrared spectroscopy and UV-vis spectroscopy, respectively. The PAMAS fibrous membranes and PAMAS/PEO fibrous membranes were prepared via electrospinning. The influence of the molecular weight of PEO and the ratio of PAMAS/PEO in spinning solution on the fibrous morphology was studied. The results showed that PAMAS has fiber-forming ability separately. The addition of PEO was helpful to the the electrospinning of PAMAS. With the increasing of PEO’s molecular weight, the average diameter of the PAMAS/PEO fibers increased. With the increasing of PAMAS content, the fibrous average diameter has an increasing tendency.
Influences of Grain Size on Electrochemical Corrosion Behaviors of Nickel-Based Alloy 718
Authors: Mo Yan , Wang Dong Zhe , Jiang Bin , Li Yong You , Liu Hai Ding , Wang Chun Guang , Wang Jin Tai
Published: April 2016

With the application upgrade of alloy 718 in the marine oil exploitation, higher corrosion resistance demands has been presented for structure design and reasonable material application of drilling and production equipments; thus there is an urgent need to understand influences of grain size on corrosion behavior of such alloy in sea water environment. In this experiment, different solution treatments are applied to nickel-based alloy 718. As a result, specimens with grain size varied from ASTM No. 9 to No. 3.5 grades. The influences of grain size on the electrochemical behaviors in simulated sea water (3.5% sodium chloride solution) are investigated using electrochemical impedance spectroscopy and polarization curves. Alloy 718 shows good corrosion resistance in this electrolyte solution, however, grain size still has an effect on its electrochemical corrosion behaviors to a certain extent. With the time going, testing results show that coarse-grained alloys with larger grain size have higher impedance values and smaller corrosion current densities, indicating a better corrosion resistance than fine-grained specimens. However, when the grain size increases further, the corrosivity resistant nature of alloy 718 would decline. Testing results show that specimen with size of ASTM No. 5 has the best corrosion resistance.
Effect of Negative Duty Cycle on Micro-Arc Oxidation Coating of Titanium Alloy
Authors: Du Yong , Lin Xiu Zhou , Cui Xue Jun , Wang Qian Wei , Li Hui
Published: April 2016

Micro-arc oxidation coating on TC4 titanium alloy was fabricated in Na2SiO3-Na3PO4 -NaOH electrolyte under constant voltage mode using a multifunctional device that is self-designed. The effects of negative duty cycle on the coating thickness, surface morphology, hardness, phase composition and anti-corrosion were studied via SEM, XRD etc. The results show that, with increasing the negative duty cycle, the coating thickness is reduced; the coating surface presents typical ceramic structure with micro-pores, the quantity of micro-pores on coating surface is reduced, the diameter of pores is enlarged and cracks are appeared with the increase of negative duty cycle; the phase ingredients are mainly composed of Ti, rutile and anatase TiO2 and the peak of matrix is disappeared while the dc is added to 45%; the hardness and corrosion resistance of coatings are distinctly improved compared with the matrix, with increasing the dc, the coating hardness is strengthened while the anti-corrosion is weakened.
Investigation on the Effect of the Substrate Temperature on the Photoelectric Properties of the Ga Doped ZnO Film
Authors: Zhao Hong Tao , Shi Yi Qiao , Tian Min
Published: April 2016

The Ga doped ZnO film (GZO) was fabricated via magnetron sputtering on the substrate of silica glass. The effect of substrate temperature on the photoelectric properties of GZO film, such as morphology, grain size, crystal structure and transparency was studied. The results showed us that the crystallinity of GZO film was improved by increasing the substrate temperature . The GZO film exhibited high transmittance (above 80% in the visible region) at the substrate temperature higher than 200°C. The lowest resistivity of 4.45×10-4Ω·cm and highest hall mobility of 11.7 cm2 v-1s-1 were obtained when the substrate temperature was 300°C.
Effect of β-SiC Particle Concentration on the Properties of the Duplex Ni-P/Ni-P-β-SiC Coating
Authors: Zhang Xiao Meng , Wang Xiao Gang , Liu Jun Tao
Published: April 2016

Duplex Ni-P/Ni-P-β-SiC coatings were prepared on 2605N double phase stainless steel substrate by electroless plating process. Experiments were carried out to compare and analyze the morphologies, composition and structure of Ni-P/Ni-P-β-SiC by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), XRD and electrochemical workstation, respectively. The results show that duplex Ni-P / Ni-P-β-SiC coating has good associativity between the coating and the substrate, β-SiC particles were uniformly distributed in the coatings, without pores, crack defects and so on. When β-SiC particle concentration is 15g/L, the microhardness reached maximum 623.285HV0.20, In addition, when the β-SiC concentration is 15g/L, the corrosion reasistence is the best.
Effect of Explosive Charge on 65Cr3C2-35NiCr Coatings Fabricated by D-Gun Technology
Authors: Cui Yong Jing , Wang Chang Liang , Tang Zhi Hui
Published: April 2016

Chromium carbide coatings are widely used on gas and steam turbine components in order to protect the components from high temperature wear-corrosion and erosion. Detonation gun spray technique (D-gun) was utilized to fabricate the 65Cr3C2-35NiCr coating on martensitic steel. The effect of explosive charge on the coating performance was then investigated. Microstructural characterizations carried out by scanning electron microscopy (SEM) indicated that denser and higher adhesive 65Cr3C2-35NiCr coating were obtained under a certain explosive charge, while a higher explosive charge resulted in the dissolution of Cr3C2 in NiCr phase and formation of numerous of micro cracks inside the coating, which presented a great threat to the mechanical property of the coating. The corresponding mechanisms were then discussed.
Effect of Assisted-Ion-Beam Gases on the Structure of Amorphous Silicon Thin Films Prepared by Ion-Beam-Assisted Sputtering
Authors: Huang Jun Jun , Gui Cheng Mei , Ding Ming , Zhao Di Fang , Han Cheng Liang , Li Ming Hua , Xie Jin Song
Published: April 2016

In this work, amorphous silicon (a-Si) thin films were prepared by ion-beam-assisted sputtering, the effect of assisted-ion-beam gases on the thin-film structure were investigated using Raman spectroscopy, Fourier transform infrared spectroscopy, and spectroscopic ellipsometry. It was observed that the introduction of assisted-ion beam improved the thin-film structure, and the ion-beam-assisted sputtering a-Si thin films possessed higher short-range order, intermediate-range order, lower microstructure parameter (R*) and defect density of states with the increased of hydrogen concentration in the assisted-ion beam gases, which due to the transfer of energy from ion to the surface Si atoms and the formation of Si-H bonds in the a-Si thin films. The a-Si thin films deposited with hydrogen-ion beam possessed the absorption coefficient at 0.8 eV and microstructure factor of 0.7 cm-1 and 0.48. It was illumined that the device-quality a-Si thin films can be achieved under the ion-beam-assisted sputtering.
Structure, Composition and Adhesion Strength of Hf Coatings Deposited on Mo Substrate by Ion Beam Sputtering
Authors: Lv Qin Li , Gao Jian , Li Tao , Liu Zhi Yuan
Published: April 2016

Hafnium films were prepared on the molybdenum substrate at room temperature by ion beam assisted deposition (IBAD) and post-annealing was conducted to know their status under high temperature. The structure and composition of Hf coatings were confirmed by XRD, STEM and EDX, respectively. The adhesion strength between the coating and the substrate was evaluated by a nanoscratch tester. The results show that some dilution occurs at the coating/substrate interface and that Mo combines with Hf to form a HfMo2 alloy after high temperature annealing. The adhesive force of the Hf coating was increased from 120 mN to 160 mN after annealing.
Preparation and Photoelectric Properties of Nb/SnO2 Composite Thin Films
Authors: He Rui Ying , Wei Chang Ping , Wang Guo Dong , San Jing
Published: April 2016

By using sol-gel method, Nb/SnO2 gel was prepared,and spin coating method was used to coat on glass substrates, which dried and calcined to obtain a homogeneous Nb / SnO2 composite films.Under the same experimental conditions, the different doping amount of nickel, calcination temperature on the structure and morphology of Nb/SnO2 film were discussed. By using XRD, IR, SEM and other testing methods, the structure and morphology of Nb / SnO2 composite film were characterized.At 500 °C, the film particle had high crystallization and small size,and the surface of the film was well-distributed.Its optical and electrical properties were tested by the ultraviolet-visible spectrophotometer and four-probe resistivity meter.UV-Vis spectra showed that Nb / SnO2 film absorbance in the near ultraviolet region had increased significantly, but the absorbance showed a downward trend with the increasing amount of Nb5+ doped;Conductivity analysis showed: Nb5+ doping amount of 8% (the amount of material), the conductivity of Nb/SnO2 composite films was best.
Highly Conductive and Transparent PEDOT/PSS Thin Films with Large Area Prepared by Bar-Coating Method
Authors: Li Juan , Zhao Xiao Li , Yan Hu
Published: April 2016

We report on optimization of bar coating method for preparation of PEDOT/PSS thin films with large area on poly (ethylene terephthalate) (PET) substrates, by investigating various coating parameters in terms of sheet resistance (Rs) and transparency (T). As a result, we have found that the addition of 1 wt% Capstone FS-30, 7 wt% ethylene glycol (EG), and a motor rotation speed of 100.8 rpm, as well as a heat temperature of 120 °C is the optimum coating condition to obtain high-performance PEDOT/PSS thin films with large area whose sheet resistance (Rs) and transmittance at 550 nm (T) were 230 Ω sq-1 and 84%,respectively.
The Performance of Plasma and Multi-Physical Fields in DC Arc Plasma Reactor for CVD Diamond Film
Authors: Li Xiao Jing , Gao Yong Liang , Yin Yan , Zheng Shun Qi , Zheng Yang Sheng
Published: April 2016

Numerical simulation method was developed to investigate the performance of plasma and multi-physical fields in direct current (DC) arc plasma reactor for chemical vapor deposition (CVD) Diamond film,in order to obtain more information on the process of CVD. Finite Volume Method (FVM) was adopted. Continuous arc forming and the dynamic formation process of rotating arc plasma were shown in this paper. Multi-physics field in deposition chamber were modeled including flow field, temperature field. Distribution of velocity and temperature were obtained by solving momentum and energy equation with SIMPLE separation algorithm. Simulation results show that, plasma temperature near the cathode tip is the highest, which is more than 1×104K. The plasma distribution shape like the bell jar. The changing regularity of outlet velocity, temperature and static pressure with the distance from the anode center were revealed. The effectiveness of plasma temperature and gas flow calculated was confirmed by the experimental results. The research results provide the theoretical foundation for obtaining uniform diamond thick film.
Hydroxyapatite-Poly(Vinyl Alcohol)-Sodium Alginate Porous Hydrogels with Poly(Vinyl Alcohol) Surface Layer Used for Articular Cartilage Repair
Authors: Luo Xiao Bing , Ma Ming Feng , Zhou Xian Ju
Published: April 2016

The double-layered PVA/nanohydroxyapatite (nHA)-poly (vinyl alcohol)(PVA)-sodium alginate (SA) porous composite scaffolds used as synthetic articular cartilage were prepared by the freeze-thawing method, gas foaming method and crosslink method of Ca2+ ion, i.e., upper PVA layer for the cartilage substitute and underlying SA30 porous hydrogels for bone bonding. The microstructure and morphology of composite hydrogels were characterized using scanning electronic microscopy (SEM).It had high porosity and uniform pores. The content of HA in SA30 matrix were tested by Energy-dispersive X-ray spectroscopy (EDS). The biological properties of the composite hydrogels had been evaluated by co-culture and MTT. All results indicate that the PVA/SA30 hydrogels has good potential for repairing or replacing articular cartilage.
Preparation of Slow-Release Potash
Authors: Qi Hong Bin , Li Huan , Liu Da Wei
Published: April 2016

In this paper, water glass was used as the silicon source to explore the production process of silicone gel coating potassium sulfate. Two experimental programs were put forward as follows: water glass coating potassium sulfate by spraying and silicone gel coating potassium sulfate by mixing. The impacts of the ratio of raw materials, experimental temperature and experimental time on the experiment were also in consideration at the same time. The morphology of the products was characterized by the SEM.
Photoinduced Microencapsulation of Microcapsules Containing n-Octadecane with P(APUA) and P(AMA) Shell
Authors: Zhang Ning Xin , Yuan Xiao Yu , Zong Ji Wen , Li Wei , Zhang Yuan Kai , Zhang Xing Xiang
Published: April 2016

An advanced microencapsulation for n-octadecane has been successfully developed via UV photoinduced polymerization in this study, which was characterized by some superior qualities (e.g. rapid microencapsulation, energy-saving and environment-friendly) compared to conventional microencapsulation process. The morphology, microstructure and properties of the microencapsulated n-octadecane with poly (aliphatic polyurethane acrylate) and poly (allyl methacrylate) as shell were respectively investigated by FE-SEM, TEM and DSC. The effects of UV irradiation time, shell material types and feed ration of shell-forming monomer to n-octadecane on the morphology and structure were investigated in detail. Furthermore, the photoinduced microencapsulation mechanism was interpreted clearly as well. Besides, the phase change properties were studied as well.
Effect of Trace Cerium on Microstructures and Mechanical Properties of 690 Mega Pascal Steel
Authors: Dong Rui Feng , Liu Ze Tian , Gao Jun
Published: April 2016

The effect of trace cerium on microstructures and mechanical properties of 690MPa steel plates used for engineering machinery was researched by the comparative analysis of the microstructures, inclusions, and comprehensive mechanical properties of the steel plates after rolled, quenched and tempered. The result shows that trace cerium can improve the yield strength, tensile strength of rolled and quenched steel plates, and low temperature impact toughness of the tempered steel plate significantly, but has little effect on the yield strength and tensile strength of the tempered steel plates. The cerium-bearing steel has finer grain size, less inclusion contents and more spheroidal than that of cerium-free steel. The yield strength of 10 megapascal, the tensile strength of 20 megapascal for rolled plates and the yield strength of 130 megapascal, the tensile strength of 100 megapascal for quenched plates was improved by the addition of cerium. In spite of this, the cerium has little effect on the yield and tensile strength but improved about 50 Joule impact energy values under-40 centigrade degree temperature after the plate was tempered at the temperature of 620 centigrade degree. It has the same rules of the plates tempered at the temperature of 580 centigrade degree.
Bioactive and Antibacterial Ag-AgCl-TiO2 Coating on Titanium Implants
Authors: Tian Tian , Hui Liu , Jun Gu Ming , Ying Jin
Published: April 2016

In this work, Ag-AgCl-TiO2 coating was fabricated on titanium substrates to obtain an implant material having excellent antibacterial property and bioactivity. The coating was investigated by scanning electron microscopy and X-ray diffraction. The bioactivity of coatings was examined by simulated body fluid soaking test. To verify the susceptibility of implant material surface to bacterial adhesion, S. aureus (Sau), E. coli (Eco), K. pneumoniae (Kpn), P. Aeruginosa (Pae), four types of major pathogen were chosen for in vitro antibacterial analyses. The results showed that Ag-AgCl-TiO2 coating had excellent antibacterial property and bioactivity.
Cell Compatibility of the Micro-Arc Oxidized Surface of Large Plastic Deformed TA2 In Vitro
Authors: Zhu Li Hua , Xu Xiao Jing , Chen Ting Zhuo , Niu Xiao Ya , Xu Lin
Published: April 2016

The cell toxicity, cell proliferation and cell adhesion behaviors on the micro-arc oxidized surface of the conventional and large plastic deformed pure titanium (TA2) were studied. The results show that all samples have no cell toxicity. The cell proliferation ability on the surface of the large plastic deformed pure titanium (TA2) is better than that of the conventional pure titanium (TA2). The numbers of cells adhered on micro-arc oxidized surface of the large plastic deformed of pure titanium (TA2) are more than that of conventional pure titanium (TA2). And the distribution of the cells and cell morphologies are better than that of the conventional pure titanium (TA2). Results all above show that structure refinement of large deformation of pure titanium (TA2) has more significant improvement on the cell compatibility of the micro-arc oxidized modified films.
Analysis and Research of GMM Bone Conduction Pronunciation Vibrator Output Characteristics
Authors: Zhao Zheng Long , He Zhong Bo , Li Dong Wei , Xue Guang Ming , Yang Zhao Shu
Published: April 2016

A new bone conduction pronunciation vibrator with a bow-type structure is proposed based on the excellent characteristics of the giant magnetostrictive material (GMM); The theoretical derivation of displacement amplification ratio is carried on based on the elastic mechanics theory; And the theoretical result is simulated in magnetic-structure coupling field through ANSYS; Eventually the actual output displacement is measured using some equipment such as the laser displacement sensor. And the reliability of the theoretical derivation is vertified by the simulation and the test. All the work done in the paper provides reference and basis for the structure parameters design and optimization of the pronunciation vibrator.
Effect of Nano Silver on Inducement of Differentiation of Neural Stem Cells of SD Rats
Authors: Yu Xiao Qian , Xu Li Xin
Published: April 2016

Objective: To explore the effect of nanosilver on inducement of differentiation of neural stem cells of SD rats. Method: nanosilver film and newborn SD rat neural stem cell co-culture method is adopted to perform primary and subculture on SD rat neural stem cells and to induce differentiation. Nestin staining is adopted to identify the characteristics of neural stem cells. Immunohistochemistry method (β-III-tubulin, GFAP staining) is adopted to detect the status of differentiation from neural stem cells into neurons and neurogliocytes. Result: The neural stem cells of newborn SD rats can form Nestin positive cell balls in case of no serum culture. After induction of differentiation, NF-positive cells and GFAP-positive cells can be seen through immunofluorescence staining, wherein for nanosilver intervention group, the proportion of hippocampal NSCs differentiating to group neurons is smaller than that of the control group, with significantly reduced impact on astrocyte differentiation. Conclusion: nanosilver has adverse effect on normal differentiation of hippocampal NSCs to neurons and astrocytes.
Synthesis and Characterization of Zeolitic Imidazolate Framework-8@Sodalite Composite Particles
Authors: Zeng Xue , Chen Rong Yi , Yang Xiao Bing , Li Jin Tang , Luo Xue Tao
Published: April 2016

We demonstrate the preparation of hierarchical porous structure composite particles containing sodalite cores,and outer zeolitic imidazolate framework-8 (ZIF-8) shells. The synthesis involved first synthesis of sodalite zeolites by hydrothermal reaction from alkali-activated kaolin with polyacrylamide acting as structure-directing agent, and followed by the directly in stu growth ZIF-8 nanoparticles shells over the sodalite microparticles. The resulting core shell structure ZIF-8@Sodalite composites were characterized by powder X-ray diffraction (PXRD) and scanning electron microscope (SEM) Nitrogen adsorption, Fourier Transform infrared spectroscopy (FTIR), hermogravimetry analysis (TGA) and differential thermal analysis (DTA). SEM picture showed ZIF-8 particles adhesive on the surface of Sodalite. The composites have a nitrogen sorption capability as high as around 120 cm3/g and a BET surface area of over 328.86 m2/g, which are much higher than that of pure sodalites. The weight percentage of ZIF-8 loading on sodalite external surface can be calculated to be approximately 12% by mass loss on the TG curves. It is believed that the designed ZIF-8@Sodalite particles could broaden the application areas of zeolites in heterogeneous catalysis.
Crystal Structure and Magnetic Property of Novel Ln(III)-Nitronyl Nitroxide Radical Complex
Authors: Hou Yi Fang , Fan Zhe , Yang Shu Tao , Wang Shu Ping
Published: April 2016

Four novel rare-earth complexes based on a new nitronyl nitroxide radical have been synthesized and characterized as: {[Ln (hfac)3(NITPhBrF)2]·0.5CH2Cl2}(Ln = Sm (1), Gd (2), Tb (3)), {[Ln (hfac)3(NITPhBrF)2]}(Ln = Dy (4)) (hfac = hexafiuoroacetylacetonate; NITPhBrF = 2-(2-fluoro-5-bromophenyl)-tetramethylimidazoline-1-oxyl-3-oxide). The single-crystal X-ray diffraction revealed that compound 1, 2 and 3 are isostructural, which crystallize in the monoclinic space group P21/n, and compound 4 is in the P-1 triclinic space group. These complexes possess mononuclear structure in which the central Ln (III) is octacoordinated by six oxygen atoms from three bidentate hfac ligands and two oxygen atoms from two NITPhBrF ligands. DC magnetic susceptibilities were measured under 1kOe in the 2 - 300 K range. The studies reveal that there exit ferromagnetic interaction between the Gd (III) and radical ligands, and the antiferromagnetic interaction between the two intramolecular radicals in Gd (2). Meanwhile complexes Tb (3) and Dy (4) exhibit antiferromagnetic interactions.
Low-Power Triplet-Triplet Annihilation Upconversion with a New Anthracene Derivatives
Authors: Zhu Sai Jiang , Ye Chang Qing , Fu Yan , Liang Zuo Qing , Wang Xiao Mei
Published: April 2016

Two new anthracene derivatives were synthesized as emitter for low power triplet-triplet annihilation upconversion. Compared with anthracene, the emitter exhibits high quantum yields up to 85%. Pd (II) tetraphenylporphyrin which was selected as the sensitizer with the existence of BBA in DMF, We find a pretty high efficiency (Φuc=21.9%) of the upconversion fluorescence at 532nm with a low excitation power density of 0.5w/cm2.With the comparison of Anthracene, BBA and BTPA systems, quantum yield of the emitter is very important to the improving of the efficiency of upconversion.
Preparation and Properties Characterization of Modified Chitosan Composited Hemostatic Materials
Authors: Wang Feng Ming , Wei Chang Ping , Li Jing , Sun Shuang , Dong Li Dan , Liu Qin Yi
Published: April 2016

Carboxymethyl chitosan (CAS) was obtained by carboxymethylation of chitosan (CS).The Ag+-CAS,TiO2-CAS and Ag+-TiO2-CAS were prepared by introducing AgNO3 and nanometre TiO2 solution into the product obtained the previous step. The structures of samples were characterized by IR, XRD, SEM etc. The properties of cruor and hemostasis were studied by biological experiment. The results showed that there were characteristic absorption peaks of carboxymethyl chitosan sodium salt around 3423cm-1 and 1380cm-1 in the IR spectra of modified carboxymethyl chitosan. The XRD showed it was metals Crystalline. The average diameter of CAS was about 14.8nm, the Ag+ was 143.5nm, nanometre TiO2 was 267.2nm and all of them were homodisperse. The properties of crour and hemostasis of Ag+-TiO2-CAS were superior to Ag+-CAS and TiO2-CAS, while the Ag+-CAS and TiO2-CAS were also have an advantage over CAS.
Preparation and Performance Research of Hemostatic Powder of Chitosan Mixed with Scutellaria baicalensis
Authors: Li Jing , Wei Chang Ping , Wang Feng Ming , Dong Li Dan , Sun Shuang , Liu Qing Yi
Published: April 2016

In this paper,using water extraction acid sinking method to extract the active components of scutellaria baicalensis.Taking a certain amount of scutellaria baicalensis powder, adding water to boil, adding hydrochloric acid to the filtrate,through a series of steps,the effective components of scutellaria baicalensis could be obtained. Through infrared spectrum and mass spectrum analysis means,it was known that the effective components was baicalin.By using the grinding method, the chitosan and baicalin were mixed to prepare the mixture.Through the cutting of mice tail hemostasia test , the performance of the product was studied.The results showed that the performance of the mixture of chitosan and baicalin was better than that of chitosan,while chitosan and baicalin optimum ratio was 1: 0.8.
Effects of Silver Nanoparticles on the In Vitro Culture and Differentiation of Human Bone Marrow-Derived Mesenchymal Cells
Authors: Yu Xiao Qian , Xu Li Xin
Published: April 2016

The antibacterial properties of silver nanoparticles may be able to prevent inflammation around an implant when placed on the surface of the dental neck. The purpose of this study was to culture silver nanoparticles on human bone marrow stem cells in vitro to determine their effects on cell differentiation and to assess their biocompatibility. Silver nanoparticles were deposited on titanium foil implant surfaces using ion sputtering, and adult bone marrow mesenchymal stem cells were cultured on those surfaces to determine the effect of the silver nanoparticles on cell viability, suitability for subculture, proliferation and differentiation. The results indicated that the silver nanoparticles were biocompatible, allowing cell proliferation and differentiation of osteoblasts, but interfered with differentiation into chondrocytes and adipocytes.
Protein Release and Biological Evaluation of Bio-Inspired Chitosan-Based Nano-Gels
Authors: Situ Fang Min , Dong Hong Wei , Wu Min Ming , Guo Kai , Zeng Rong , Tu Mei , Zhao Jian Hao
Published: April 2016

Bio-inspired nanogels were prepared by ionically crosslinking sodium tripolyphosphate (TPP) and biomimetic phosphorylcholine-chitosan derivative (PCCs) which was synthesized from chitosan and cell membrane-mimicking phosphorylcholine. The physcochemical properties of PCCs/TPP nanogels were investigated by dynamic laser scattering and transmission electron microscopy, as well as their hemocompatibility were tested. Bovine serum albumin was used as a model protein to study protein adsorption, loading and releasing property of these nanogels in vitro. The results indicated that biomimetic PCCs/TPP nanogels can not only restrain the non-specific protein adsorption, improve the hemocompatibility, but also have good loading and releasing protein efficacy, which will be a promising nanocarrier for protein drug delivery.
Study on the Preparation and Performance of Carboxymethyl Chitosan Calcium and Carboxymethyl Chitosan Zinc Composite Materials
Authors: Li Jing , Wei Chang Ping , Wang Feng Ming , Dong Li Dan , Sun Shuang , Liu Qing Yi
Published: April 2016

In this paper,under alkaline conditions,with chloroacetic acid to modify chitosan,obtained carboxymethyl chitosan. At pH<7 conditions,the obtained carboxymethy chitosan respectively were reacted with calcium chloride solution,zinc chloride solution,after fully reacted,obtained carboxymethyl chitosan calcium and carboxymethyl chitosan zinc .Through infrared spectrum,X-ray diffraction and scanning electron microscopy (sem) analysis means,the structure of the products were characterized.Through the cutting of mice tail hemostasia test ,study the performance of the product.The results showed that the water solubility of carboxymethyl chitosan is better than that of chitosan and with excellent performance,and the performance of carboxymethyl chitosan calcium and carboxymethyl chitosan zinc was better than that of carboxymethyl chitosan.
Corrosion Resistance of Mg-4Zn Alloy with Amorphous Micro-Arc Oxidation Coating in Simulated Body Fluid
Authors: Zhao Li Chen , Liu Shuang Jin , Qi Yu Min , Cui Chun Xiang
Published: April 2016

A binary Mg-4Zn alloy was fabricated as a potential degradable biomaterial. To improve the corrosion resistance of Mg-4Zn alloy, an amorphous micro-arc oxidation (MAO) coating was prepared on the Mg-4Zn substrate. Electrochemical measurements and immersion tests were employed to evaluate the corrosion resistance of the specimen in simulated body fluid (SBF). Electrochemical measurements show that the Mg-4Zn alloy covered with a MAO coating has a much lower corrosion current density and a much greater polarization resistance. Immersion tests suggest that the degradation of Mg-4Zn substrate is relatively serious during the initial 8 h of immersion although it has been protected by a MAO coating. When most micro-pores within the MAO coating have been filled with precipitates resulted from the corrosion of the metal substrate, the degradation of the Mg-4Zn substrate is significantly delayed.
Fabrication of Ultra-Low Density, High Surface Area Carbon Aerogels and their Application in Supercapacitors
Authors: Zhu Jia Yi , Yang Xi , Fu Zhi Bing , Wang Chao Yang , Wu Wei Dong , Zhang Lin
Published: April 2016

The ultra-low density carbon aerogel, as low as 20 mg/cm3, was fabricated by pyrolysis of the organic aerogel formed by aqueous condensation of resorcinol and formaldehyde. Its surface area was as high as 1783 m2/g and it was used for investigation of electrochemical capacitive behaviours. The ultra-low density carbon aerogel displayed capacitive performance (110 F/g at 0.2 A/g) in 6 M KOH aqueous solution. Additionally, over 98% of the initial capacitance was retained after repeating the cyclic voltammetry test for 1000 cycles. The electrochemical performance might be attributed to the combination of three dimensional “opened” structure and high surface area of the carbon aerogel.
A Innovative Method for Evaluating Basswood Pyrolysis Kinetics
Authors: Peng Jin Xing
Published: April 2016

A innovative method to simplify calculation the kinetics model is applied to wood pyrolysis. Thermal degradation of basswood was investigated with thermogravimetry. The thermal kinetic TG analysis of basswood under N2 atmosphere was studied at the heating rate of 10,20, 30, 90K/min. All the TG curves are divided into four parts which are drying, slow pyrolysis, fast pyrolysis, and carbonization. The third one is employed to determine the parameters for around 69% of the total mass loss occurs in this range. The peak of the composition is according with DTG curve. It validate assumption of reaction stage.According to the developed method, the react order, reaction energy and pre-exponential factor are obtained, which are in the range of 2.8~4.3, 101.7~126.6 kJ/mol and 2.3×108~7.0×1010min-1, respectively, which are in the range of that reported previously. As a comparison experimental data with calculated data, the well fitting results indicate that this method is appropriate for simulating wood pyrolysis kinetics.
Comparison and Analysis of Sodium Silicate and Epoxy Bonded NdFeB Magnets
Authors: Yin Yu Xia , Hu Rui Jin , Liu Wei Qiang , Yue Ming , Zhen Zhi Chao
Published: April 2016

Sodium silicate bonded and epoxy bonded magnetic NdFeB materials are fabricated, respectively. The magnetic properties, temperature coefficient, heat-corrosion and compressive strength of both bonded magnets are investigated. Results reveal that sodium silicate bonded magnet has a similar comprehensive property to epoxy bonded one. Compared to the epoxy bonded magnets, the sodium silicate bonded NdFeB has better temperature coefficient between 20 and 100 °C. The α value of the sodium silicate bonded NdFeB is-0.127 %/°C while the β value is-0.275 %/°C between 20 and 200 °C. DSC thermogram shows that sodium silicate as a bonder in magnet could exist at a higher temperature (above 1000 °C), which is far bigger than the curie point of NdFeB magnet powder. The weight gains of sodium silicate bonded magnet obtained in heat-corrosion resistance test are smaller than those of epoxy bonded one. Compressive strength test shows that sodium silicate bonded magnet has a larger compressive strength (35 MPa) than that of epoxy bonded magnet (27 MPa). Compared to the epoxy, the sodium silicate as bonder in the bonded magnet shows more compact. As a result, the sodium silicate bonded NdFeB bears better magnetic properties, temperature coefficient, heat-corrosion resistant and compressive strength.
Simulation and Optimization of Cement - Slag Gradation with Limestone Powder
Authors: Huang Pei Zhou , Guo Wen Ying , Guo Kai , Fan De Sai , You Xin , Wang Zhen Yu , Wang Cheng , Yang Yi Bo
Published: April 2016

Since the gradation of cement-slag has significant influence on its properties, the optimal gradation of cement-slag was studied by imitating with limestone powder. From experimental results of the porosity and fluidity of limestone power and on the base of the RRB equation, the optimal gradation area was got and its rationality was confirmed by experimental results of cement-slag.
Review on Development and Application of Gelled Material Filling Mined-Out Area
Authors: Liu Yong , Chen Jie
Published: April 2016

With the development of the cementing filling technology,the research and application of filling cement materials technology has also made great development. This paper introduces the high water quick-setting filling cementing material, fly ash filling gel material, slag cementing filling material new filling gel materials such as the general situation of the research and application in mine industry analyses the characteristics of different filling cementing materials and limitations, and puts forward the development potential the activity of potential of industrial solid waste to reduce filling gelled material cost and improve the gel material performance will be filling material of the future development direction.
Carbon Felt Properties of Pyrolytic Carbon Felt Direct Thermal CVD
Authors: Xu Xian Feng , Zeng Ling Sheng , Ouyang Tian , Chai Ling Zhi
Published: April 2016

Taking acetylene as the carbon source gas diluted with nitrogen gas in this paper, carbon felt was heated under the nitrogen atmosphere, the temperature of carbon felt increased using heat generated by itself, which so as to cleave the carbon source gas and densify carbon felt by pyrolytic carbon deposition. The electrothermal property of carbon felt at elevated temperature and pyrolytic carbon was fabricated by direct thermal chemical vapor deposition (CVD) were investigated. Deposition rate and microstructure morphology of pyrolytic carbon in the carbon felt under different processes were also researched by scanning electron microscopy (SEM). The results show that: the resistivity of carbon felt decreases with increasing temperature at 100°C~1000°C, temperature coefficient of resistance is-4.067×10-4. Deposition and Growth of Pyrolytic carbon are by small microcrystalline and layer mode, respectively, with the extension of the deposition time, tree-ring shape is formed. When other conditions are the same, the higher of gas carbon concentration, the faster of pyrolytic carbon deposition rate.
The Steel Slag Fly Ash Foamed Concrete Thermal Properties
Authors: Yu Shui Jun , Li Bin , Chen Xiao Li
Published: April 2016

Industrial emissions used as admixture in foam concrete not only save resources, but also improve the properties of foam concrete. In this paper the thermal properties of steel slag fly ash foamed concrete was studied through experiments, and the results were analyzed. This paper included several of them and validated them using test dates, compared the results with other researchers. The result is the general model can predict the thermal conductivity of foam concrete better. Maxwell-Eucken model can regard as the boundaries’ formula to predict the coefficient of thermal conductivity of foam concrete and determine the limits. For the same density with the increasing of the steel slag thermal conductivity increases, specific heat decreases. The porosity is linear to the density of foam concrete.
Study on Surface Modification of Micaceous Iron Oxide
Authors: Qi Hong Bin , Liu Da Wei , Li Huan
Published: April 2016

Micaceous iron oxide is a mica-like structure α-Fe2O3. As anti-rot material, micaceous iron oxide, holding the performance of good thermal and chemical stability, high covering capacity and strong ultraviolet absorption, is widely used in based pearlescent pigments. This paper introduces the preliminary test method of how to prepare pearlescent pigments from covering titanium dioxide over micaceous iron oxide, by the analysis technology of SEM and EDS, and finally find the Optimum conditions.
Effect of Welding Current on Microstructure and Properties of TIG Welded EW75 Magnesium Alloy
Authors: Lu Chun Fang , Li Yong Jun , Zhang Kui , Li Xing Gang , Ma Ming Long , Shi Guo Liang , Yuan Jia Wei
Published: April 2016

Using the wire of the same material as base metal, EW75 magnesium alloy (Mg-7Gd-5Y-1Nd-0.5Zr wt. %) plate with the thickness of 6 mm was welded by TIG to investigate the welding property. Optical microscopy (OM), scanning electron microscopy (SEM) and universal tensile testing machine were used to analyze the appearance of the welding joint, organization performance and mechanical properties.The results revealed that the fusion zone (FZ) was composed of fine equiaxed grains. Precipitated phase distributed on the grain boundary as network structure. The grain size in heat affected zone (HAZ) was coarse because of overheating. The grain size of the FZ increased sharply when the welding current was more than 125A. With the increase of welding current, the grain size of the HAZ remained relatively stable. The hardness curve presented typical “W” shape, and the microhardness of the FZ was the highest, then was the base metal (BM), while the HAZ was the lowest. The welding joint showed uniform scale shape when the welding current was125A.The tensile strength of welding joint was 228 MPa, about 89.4% of the BM, the fracture location was in the FZ and the fracture surface was characterized by mixture fracture.
Influence of Heat Pre-Treatment on Washing Pre-Treated MSWI Fly Ash Cementitious Activity
Authors: Zhang He , Shi Hui Sheng
Published: April 2016

The influence of heat pre-treated temperature (600°C、700°C、800°C and 900°C) on washing pre-treated MSWI fly ash (PW-MSWI) cementitious activity was studied by mortar experiment. Concrete experiment was also conducted to figure out the influence of both PW-MSWI and heat pre-treated PW-MSWI(PWH-MSWI) on concrete strength development. Hydration mechanism and products of cement-MSWI cementitious system were analyzed by XRD and DSC-TG. The results show that heat pre-treatment improve the early-age activity, but reduce the later-age activity of PW-MSWI. The best heat pre-treated temperature is 700°C. Both PW-MSWI and PWH-MSWI improve the early-age strength, but harmful to later strength development of concrete. PWH-MSWI is better on concrete early strength improvement than PW-MSWI. In contrast to cement, more ettringite and chemical bonding water are formed during the early-age hydration of cement-MSWI cementitious system, but the hydration rate of ettringite and calcium hydroxide slow down in later age, leading to less chemical bonding water.
Research on Properties of the Concrete with Waste Rubber Powder
Authors: Liu Ming Lei , Zhang Guo Dong , Ding Ya Fei , Wei Lin , Wang Yang , Zhang Xiu Zhi
Published: April 2016

Different particle sizes of waste rubber are mixed according to natural fine aggregate gradation to replace the fine aggregate in concrete by weight. And the effect of waste rubber content on performances of concrete mixture, the mechanics, frost resisting, thermal insulation of hardened concrete are studied. The results show that the slump and apparent density of concrete mixture decreases with the increase of waste rubber content. Compressive strength of the hardened concrete also decreases obviously with the increase of waste rubber content and compressive strength decreases by 46.5% when the content is 30%; compared with ordinary concrete, the freeze-thaw resistance of concrete with waste rubber powder is obviously improved; thermal conductivity of concrete with waste rubber is only 13% of ordinary concrete, and the concrete with less than 20% wt. of waste rubber has low water absorption and good water resistance.
Preparation of HTLcs from Magnesium Desulfurization Residues and their Catalytic Performance in Degradation of Waste Polyester
Authors: Xu Ting , Zhao Dan , Dong Yan Mao , Wei Liao Yu , Zhu Guang Ai , Gu Ming Yu
Published: April 2016

To recycle the solid wastes, the hydrotalcite-like compounds (HTLcs) were prepared from the magnesia flue gas desulfurization residues (MFGDR). The HTLcs as prepared and the products from degradation of Poly (ethylene terephthalate) (PET) were characterized by thermogravimetric analysis (TG) , x-ray powder diffraction (XRD) , fourier transform infrared spectrometer (FTIR) and differential scanning calorimetry (DSC) methods. Effects of calcining temperature and alkaline of solution on the structure and performance of HTLcs were studied. The main product of alcoholysis of PET was bis-hydroxyethyl terephthalate (BHET). The catalyst shows a potential application in solid waste treatment and recycle.
Preparation of Bi1-xLaxVO4 and its Photocatalytic Degradation on Rhodamine B
Authors: Ding Yan , Fu Liang Fang , Wang Yu Huan , Li Liang Chao , Li Juan Bi
Published: April 2016

A series of photocatalyst Bi1-xLaxVO4 (0.1, 0.3, 0.5, 0.7) powders were prepared by hydrothermal method. The composition, structure, morphology and photocatalytic activity of the samples were researched by means of modern testing techniques. Bi1-xLaxVO4 showed excellent visible-light sensitivity and photocatalytic activities. The degradation rate of sample with x = 0.5 on rhodamine B reached 90 %, which was much higher than that of pure BiVO4.