15 September 2013, Volume 44 Issue 17
    

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    工艺 技术
  • ;Xiao-rui Li
    . 2013, 44(17): 1-0.
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    Abstract: Waterborne UV curable polyurethane-acrylate emulision was prepared with isophorone diisocyanate(IPDI), polycaprolactone diols (PCL1000), 2,2–dimethylolbuty ricacid (DMBA), pentaerythritol triacrylate (PETA) and acetone as raw materials. And the emulsions were utilized for paper surface sizing. Fourier transform infrared spectrometer (FT-IR), and light scattering were used to analyze the structure of emulsion; effects of n(NCO)/n(OH)(R value) on the emulsion properties were systematically studied , as well as the water resistance and mechanical property of corresponding films. In addition, effects of UV curing on paper physical properties were discussed. The results showed that the emulsions were stable and the films displayed good water resistance and mechanical property, the water absorption decreased to 3.66% when n(NCO)/n(OH)=1.6 , w(PETA)=12.6%. After UV curing, the wet strength of paper increased to 41.65%, and the ring crush index of paper reached 5.25N.m.g-1.
  • 综述 进展
  • YI CHEN; ;;;;
    . 2013, 44(17): 2-0.
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    This article mainly focuses on the current world-wide technology trend of large area (>1.0x1.0 m2)electrochromic smart glasses as building energy efficient windows. We compared and analyzed different technologies in Europe and the US. The mainstream technology for commercialized EC glasses is: All solid-state electrochromic glasses with inorganic transition metal oxides (WO3) as electrochromic materials, Li+ as conducting ions, inorganic compounds or organic polymers containing Li+as electrolytes. We should speed up the commercialization process of this new technology to meet China's growing demands for building energy efficiency.
  • 研究 开发
  • Jia-Xing YIN
    . 2013, 44(17): 3-0.
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    Fe3O4 nanoparticles were prepared through thermal decomposition method and coated by SiO2 using ethyl orthosilicate,then grafted N-[3-(Trimethoxysilyl)-propyl]- ethylenediamine on the surface to prepare amino-functionalized magnetic nano- composite particles Fe3O4@SiO2-NH2. The sample was characterized by TEM, VSM, XRD, FTIR respectively. The adsorption of Pb2+ from wastewater was also investigated under many different conditions. The results showed that the sample with core-shell structure has uniform size of average 50nm,there are rich amino functional groups on the surface. The result of VSM indicated that the sample was superparamagnetic.The experiments demonstrated the sample have excellent adsorptive capacity of Pb2+,which will be used to deal leaded wastewater as a promising adsorbent.
  • tuerxun
    . 2013, 44(17): 4-0.
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    The orange-colored phosphor powder of natural sodalite codoped with S2- and Eu3+, Na8Al6Si6O24Cl2: S2-, Eux3+ (x = 1, 3, 5, 10wt% ), were prepared by solid-state reaction method. The sample structure was characterized using XRD. The photoluminescence excitation spectra and the emission spectra at room temperature and low temperature were investigated. The emission spectrum included at 581~625 nm originating from the4f6(5D0)→4f6(7FJ) (J=0,1,2,3,4)transition of Eu3+ and green light at 496nm originating from the 4T1→6A1transition of Mn2+ under 294nm UV excitation.
  • WANG Xiao He;;
    . 2013, 44(17): 5-0.
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    A new automatic brush electroplating technology was developed to improve the quality and automatic level of electro-deposition. Effect of current density on microstructure and properties of automatic brush electroplating nickel were investigated by SEM, XRD, TEM, X-ray stress tester, micro hardness tester and CETR, and the plating was compared with Watts Ni plated. The results show that automatic brush electroplated nickel has compact and smooth microstructure, without pinholes and nodules etc. defect. With current density from 4A/dm2 increase to 16A/dm2, the degree of (111) preferential orientation decreases and that of (200) preferential orientation increases by degrees; the grain size and internal stress gradually increases; the microhardness fluctuate in 500~ 600HV, and the loss weight from 6.8mg to 5.2mg.
  • ;Junying Chen
    . 2013, 44(17): 7-0.
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    Negatively charged heparin and positively charged type IV collagen were assembled onto titanium surface by a layer-by-layer (LBL) self-assembly technique. Based on this approach, this work mainly investigated the effect of modified surface and assembled layer numbers on the behavior of endothelial progenitor cells (EPCs). Titanium was firstly activated by NaOH solution to generate a negatively charged hydroxyl-rich surface for subsequently poly-L-lysine (PLL) electrostatically binding and thereby formed positively charged amino group modified surface. Then the negatively charged heparin and the positively charged type IV collagen were alternately assembled onto the PLL coated titanium surface to form the functional multilayer via intermolecular electrostatically interaction. The change of the surface chemical composition after each step was detected by fourier transform infrared spectroscopy. The total amount of assembled heparin was determined by toluidine blue assay. The surface topography and hydrophilic /hydrophobic property of the functional multilayer sample was investigated by atomic force microscopy and water contact angle measurement, respectively. The experiment results showed that heparin and type IV collagen were successfully assembled onto material surface. In compared with the controlled titanium surface, the biofunctional multilayer surface significantly improved endothelial progenitor cells (EPCs) adhesion. Meanwhile, with increasing of the assembled layer numbers, the biological behaviors of the endothelial progenitor cells were obviously improved, such as better adhesion, more accelerating growth and proliferation. It is due to the amount of IV collagen increasing.
  • Xian-zhen ZHANG;
    . 2013, 44(17): 8-0.
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    Abstract: To study desilication mechanism of bauxite bioleaching, the interaction were compared between the silicate bacterium JY03 and bauxite under the microbe-mineral contact / noncontact modes, and the effects of biofilm and passivation coating forming on the bauxite surface in bioleaching system were investigated. The results show that:In initial step of bioleaching(0-6d), the bauxite surface were not coated by biofilm and passivation coating, and the dissolution approach of Al and Si is mainly under indirect contact mode; 6-12d, as the biofilm formed gradually on the bauxite surface, the dissolution rate of Si was mainly under contact mode, significantly higher than indirect contact mode; After a 12 d leaching, the concentration of SiO2 is about 15 mg?L-1 higher in the leaching solution of contact model than that in the indirect contact model; in 8-12d, as Al2O3 sediment was forming, Al dissolution rate slows significantly in contact system, and decreased in indirect-contact system; after 12d-leaching, when a passive film was formed on the bauxite surface by flocculation and sedimentation of Al2O3, the Al2O3 concentration in the leaching solution was decreased significantly, and SiO2 concentration reaches a maximum and stabilized. It is concluded that biofilm can promote Si dissolution and Al2O3 passivation coating has inhibition effect on Al and Si dissolution.
  • 工艺 技术
  • ; ;
    . 2013, 44(17): 9-0.
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    Ceramic coatings were fabricated on ZL205A aluminum alloy during micro-arc oxidation by mixing La(NO3)3 and Nano-ZnO into the metasilicate electrolyte . The effects of compound additive of La(NO3)3 and Nano-ZnO in electrolyte on thickness, hardness, corrosion resistance and microstructure of the ceramic coatings were analyzed. The results show that nano-ZnO is deposited on the surface layer of the ceramic coatings in micro-arc oxidation reaction process. The corrosion resistance of the coatings is thus improved. Both the thickness and hardness of the ceramic coatings increased a lot. The optimal addition amount of La(NO3)3 and nano-ZnO in the electrolyte is 0.5g/L and 3g/L.
  • 研究 开发
  • Fen LI;
    . 2013, 44(17): 10-0.
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    It is inspected the influence of the direct precipitation preparation method on the desulfurization performance and grain size, and characterized the structure of desulfurizer using XRD and TEM. The results indicate that the nano CuO is for monoclinic system. Low raw material concentration and small precipitation dosage are detrimental to the formation of the small scale of nano CuO. But the precursor have broken down trending to form copper oxide and grain size slightly increased under heating conditions; The nano CuO prepared under optimum conditions(the molar ratio of OH- : Cu2+ is 2.5:1, raw material concentration is 0.4 mol/L, stirring temperature is 25℃, calcination temperature is 300℃) exhibits the best desulfurization performance with a H2S breakthrough time of 640min, the grain size of nano CuO is 11.8 nm with a better particle dispersion; The grain size of nano CuO effects its desulfurization performance, but only when the grain size is large different, it will present a clear correlation between the grain size and desulfurization performance.
  • ; Meijie Yu
    . 2013, 44(17): 11-0.
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    Structural features of fibers during the preparation of PAN carbonized fiber were investigated by X-ray diffraction including both two-dimensional and plane scanning examinations. The differences of crystalline structures and crystalline orientation of dry-jet-wet spinning precursor fibers during pre-oxidation and carbonization were revealed. The results show that the evolutional laws of orientation and crystallinity of fibers in the different stages are observed intuitively by the two-dimensional diffraction patterns in the equatorial direction. Compared with the precursor fiber, the orientation, crystalline size and crystallinity are increased and the interplanar spacing has no obvious change for 205℃pre-oxidized fibers. While, for 235℃pre-oxidized fibers, the orientation, crystalline size and crystallinity are decreased and the interplanar spacing is increased. Compared with the precursor fiber and pre-oxidized fibers, the orientation, crystalline size, crystallinity and interplanar spacing of fibers are decreased obviously during the carbonization.
  • Sai-Nan WEI ;;;
    . 2013, 44(17): 12-0.
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    Ni-Fe microwave absorbing fiber bundle is prepared by copper coated Ni-Fe alloy wire and electrochemical treatment, which monofilament length is of 38~40mm and diameter of about 10μm. The morphology, composition, magnetic properties and spinnability of the fiber have been characterized by Scanning Electron Microscopy (SEM) analysis, X-ray photoelectron, Vibrating Sample Magnetometer (VSM) and textile fiber performance test instruments. It is shown that, this nickkle iron fiber cross-section is irregular profiled, multiple smooth longitudinal channels exist, no curling, fiber aspect ratio is up to 3800 or more, which structure is conducive to enhance microwave absorbing properties and spinnability. Nickel and iron total content is up to 90%, it of high saturation magnetization of 63.45A ? m2/kg and high initial permeability of 2035 H/m, which is much higher than conventional ferrite absorbing materials. Its tensile, bending and friction spinnability were compared with stainless steel fibers and cotton fibers. It predicted this article nickel iron fiber is applied for textile processing development of flexible absorbing fabric.
  • Jin YANG;;
    . 2013, 44(17): 13-0.
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    The resistance switching effect physical mechanisms of resistance random accessory memory is studied with the first-principles based on the density functional theory and the VASP software. The comparison calculation of the energy band, density of states, isosurface of partial charge density and formation energies of Ag doped system, oxygen vacancy defect system and the co-doped composited defect system of the Ag and oxygen vacancy in the monoclinic HfO2 are performed. The calculated results reveal that the conductive path of Ag doped system can be established, but the oxygen vacancy defect system cannot be established under the same concentration. The calculated results also reveal that the conductivity of the resistance switching mechanisms in co-doped system is mainly dependent on the Ag and is auxiliary dependent on the oxygen vacancy defects, the formation energy becomes smaller and the system is more stable. The Mulliken population and migration barrier of the co-doped system is calculated. The calculated results indicate that when the oxygen vacancy defects exist, the Ag-O bond is enhanced obviously, the migration barrier of the Ag ions becomes smaller and the electrochemical performance is also enhanced. In addition, the calculated results of the interaction energy among the defects of the co-doped system are negative, which show that the associative ability exists among the defects and the system becomes more stable.
  • 工艺 技术
  • ;Heng-yong WEI ;;;
    . 2013, 44(17): 14-0.
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    The alumina xerogel was prepared by non-hydrolytic sol-gel method using anhydrous aluminium trichloride with isopropyl ether as raw materials. After the xerogel was calcined at 800 °C, the phase of γ-Al2O3 began to crystallize from the amorphous phase, and then converted to α-A12O3 near 1200 °C. The smaple kept a high specific surface area of 145 m2/g to about 900 °C, and possessed the mesoporous structure. Using the alumina xerogel as the aluminum source, aluminum nitride ultrafine powder was synthesized by the carbon thermal reduction nitridation process. The resluts showed that when the alumina xerogel was pre-calcinated at 300 ℃, the C/Al molar ratio amount of the carbon was 7.8, the flow rate of nitrogen was 80ml/min, the synthesis temperture was 1450 °C and the soaking time was 2h, the high purity hexagonal phase aluminum nitride powder with the average size of about 400 nm could be obtained.
  • Ji-Xiang ZHU;;Yang Fan-Wen
    . 2013, 44(17): 15-0.
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    Chitosan scaffolds were fabricated via freeze-drying chitosan gel using genipin as a crosslinking agent. The influence of the preparation technology to the property of scaffold was studied and the results showed that scaffold fabricated from a neutral pre-gelled chitosan solution displayed highly interconnected and uniformly distributed pores and a porosity over 90%. This scaffold also showed higher water absorption and BSA adsorption. Compressive tests demonstrated that this scaffold had significant elasticity and maintained its physical integrity even after compressing them down to 20% of their original height and the elastic modulus reached 81kPa. Adhesion and proliferation of PC12 cells on this scaffold showed excellent properties by MTT and SEM observation, which indicated the potential for nerve tissue engineering applications.
  • 研究 开发
  • Yan-Ming SHEN
    . 2013, 44(17): 16-0.
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    Lactate intercalated layered double hydroxide ( Lact-LDH ) was prepared by co-precipitation, then it was delaminated in water. The delaminated LDH was used to immobilize horseradish peroxidase (HRP), and the stability and performance for the degradation on phenol by the resulted LDH immobilized HRP was investigated. It was shown that adding phosphate buffer solution was helpful to the immobilization and the delaminated LDHs were reconstructed to phosphate intercalated LDHs, on which surfaces the HRPs were adsorbed. The immobilization process could be described by the pseudo-first-order kinetics model. Under the experimental conditions, both Langmiur and Freundlich isotherms fitted the experimental data, owing to the infinite surfaces of LDH. The stability of HRP was improved after being immobilized on LDH. The phenol removal could reach above 80 % on the as-prepared immobilized HRP and still kept 50 % after 3 cycles usage.
  • ; ;;
    . 2013, 44(17): 17-0.
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    The micro topography of phase interface of KDP (100) face under different supersaturation were investigated by using in situ and ex situ AFM technique. The recovery of crystal growth from the dead zone was observed. The in situ AFM images of the generating process of the macrostep were obtained for the first time. The formation mechanism of macrostep was explained. The instability of the step was analyzed. The results show that the micro topography of phase interface of KDP (100) face under different experimental conditions all exhibited as stepped surfaces. The growth steps result from spiral dislocation at lower supersaturation, while layer step flows are yielded by two-dimensional nucleation at higher supersaturation.
  • Jun-gang FAN;Wen-Xiu LI
    . 2013, 44(17): 18-0.
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    Ag+-modified 13X zeolites were prepared by calcinations and metallic ion exchange in nitrate solution and used for adsorptive desulfurization of fuel. Different metallic ion effect the desulfurization capacity by the order of Ag+>Ni2+>Zn2+>Fe3+, it also conform to Hard-Soft Acid-Base Theory. Calcinations influence the modification through temperature and time, and the optimal conditions are 450 ℃ and 6 hours, respectively. SEM、XRD and BET characterization indicate the modification did not change the framework of porous solid materials. Fix-bed experiments were carried out with thiophene dissolved in n-heptane as model gasoline, and the results illustrate the Ag+-modified 13X zeolites have higher desulfurization capacity than 13X.
  • . 2013, 44(17): 19-0.
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    Abstract: The authors have investigated luminescent properties and luminescence mechanism by adjusting the doping ratio and combing with TCTA and BCP (electron and hole barrier material).The structure was ITO/MoO3 (10)/NPB (40)/TCTA (10)/CBP: R - 4 B (x)/BCP (10)/Alq3 (40)/LiF/Al , R – 4B was new red phosphor dopant. It was found that the better efficacy and color stability device was obtained, utilizing 6% doping ratio. The maximum current efficiency was 19.48 cd/A, current density was 0.045mA/cm2, brightness was 3.57cd/m2 at 4V. The CIEx,y coordinates of the device showed (0.60, 0.35), (0.64, 0.34) and (0.64, 0.35) at 5V ,10V, 15V, separately. The improved performance was attributed to the mainly luminescent mechanism which including the energy transfer from the host materials CBP to R - 4 B and the carrier direct injection. Moreover, TCTA and BCP blocked the carrier and exciton of emitting layer, efficiently.
  • ;
    . 2013, 44(17): 20-0.
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    In order to prepare a kind of environmental friendly waterborne paper water and oil-resistant agent, the solvent-free perfluoroalkyl waterborne polyurethane-polyacrylate was synthesised. The reaction of polyurethane by isophorone diisocyanate (IPDI), polytetrahydrofuran ether diol (PTMG1000), N-Methyldiethanolamine (MDEA), perfluorooctyl ethyl alcohol perfluoroalkylol (FEOH) and 2-hydroxyethyl acrylate (HEA) firstly carried out using the acrylic monomers as solvent, and then the radical polymerization of the said acrylic monomers was take place. The structure and performance of the polymer were characterized by fourier transform infared spectrometer (IR), gel permeation chromatography (GPC)、thermogravimetric analysis (TG). At the same, the application of paper water and oil-resistant experiments and paper application performance shown that, the contact angle of water and liquid paraffin were up to 130.2°and 113.5° which indicated that it has excellent water and oil-resistant effect, and it can meet the requirement of specialty paper.
  • 工艺 技术
  • Sui-He JIANG
    . 2013, 44(17): 21-0.
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    The rolling and transverse directions’ magnetic properties of warm rolled Fe-6.5wt%Si thin sheet in the process of annealing and low temperature aging was observed. Effect of crystallography texture, microstructure and disorder-order transition on magnetic properties was studied by means of orientation distribution functions, optical microscope and x ray diffraction. The results show that the value of B50 was determined by crystallography texture which also have an important effect on core loss for high silicon steel. Decrease of core loss with formation of D03 phase which decreases the saturation magnetostriction was minora compared with effect of grain diameter, B2 ordering calculated from x-ray patterns and increase in an order parameter take placed with furnace cooling may result in the decrease of B50.
  • ; ;Qiting Lu
    . 2013, 44(17): 23-0.
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    The trimellitic anhydride – ethanediol polyester (TEPES) and the trimellitic anhydride – 1,3-butanediol polyester (TBPES) have been synthesized with trimellitic anhydride (TMA), ethanediol (EG) or 1,3-butanediol (1,3-BG) as raw materials, and monobutyl tin oxide as the catalyst. The results show that, the hydroxyl value, number average functionality (fn) and weight average functionality (fw) of TEPES are 400.0 mg KOH/g, 6.55 and 7.31, respectively. The hydroxyl value, fn and fw of TEPES are 357.2 mg KOH/g, 5.87 and 6.49, respectively. It can be seen that TEPES has a wider molecular weight distribution than TBPES. 1H NMR spectra and TGA curves reveal that, during the reaction there are not only a single hydroxyl reaction, but also a dihydroxy crosslinking reaction between dihydroxy alcohol and TMA, which further verify the GPC results. In addition, The synthesized polyester polyols both have a few raw dihydroxy alcohol, which is also identified by TGA。It is indicated that TBPES has a better low temperature thermal stability than TEPES, while its high temperature thermal stability is worse than TEPES. With the same apparent density 60 kg?m-3, the PU rigid foams of different polyol synergistic systems, have been prepared with GR-835G, TEPES, TBPES and PM-200, as main raw materials. Comparing to the single system with GR-835G, the compressive modulus of the polyol synergistic system between TEPES and GR-835G, has a greater improvement than that of the polyol synergistic system between TBPES and GR-835G. The compressive strength of PU rigid foams will decrease with TEPES used, however, The compressive properties can be improved using TBPES.
  • Dong-Na Dong LI
    . 2013, 44(17): 24-0.
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    After melt-spinning by adding hexamethylenetetramine and the curing treatment, wooden activated carbon fibers are prepared from the phenolated Chinese Fir (Cunninghamia Lanceolata) using CO2 activation, the microstructure characterization is investigated by SEM and Raman spectroscopy, and the effects of activation processes on iodine adsorption properties also are studied. The results show that wooden activated carbon fibers have smooth surface and a circular cross-section; when activating temperature reaches 500℃, Raman Spectroscopy shows typical D peak and G peak of carbon materials, and the crystallite sizes Lα increases and the value of the disordering R decreases with the activating temperature increasing. At the same time, iodine adsorption of wooden activated carbon fibers increases significantly with the activating temperature and the flow rate of CO2 increasing; iodine adsorption of wooden activated carbon fibers is found to be maximum at the activating time 40min and then fall.
  • Zhi-Jiang Zhou;
    . 2013, 44(17): 25-0.
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    In order to overcome the particle sedimentation issue of MRF, along with the small control range trouble of MRE, a new MR material, named as Magneto-rheological viscoelastic fluid (MRVF), is put forward. The carrier of MRVF is based on the chemical products of hexamethyldisiloxane and polyborodiphenylsiloxane. By means of ball milling method and special additives, four samples are developed. The rotary rheometer, Austrian Anton Par MCR-301, is used to test the rheological properties of the samples. The experimental results show that the shear stress varies from 5kPa to 120kPa with the shear rate of 200s-1 and magnetic induction intensity of 0~0.9T. According to the curves of shear stress versus shear rate, Gaussian Function is adopted to describe the constitutive model, and the least square method is applied to identify the parameters of the model. The shear stress decreases less than 10% with temperature increasing from 25℃ to 80℃. After standing for three months, the sedimentation rate of the samples was less than 4%.
  • Fu-Qing ZHANG
    . 2013, 44(17): 26-0.
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    In this paper, a method for preparing a low reflectivity nano-light trapping structure of solar cell was proposed. We used graphite nanoparticles (GNPs) as a mask, afterwards,the metal assisted etching method was used to prepare the nano-light trapping structure. By this method, a nano-light trapping structure of solar cell was obtained, which is covered with nanowires and nanoholes. According to the metal-assisted etching mechanism and the formation principle of this light trapping structure, the influences on different morphologies of the light trapping structure prepared under different GNPs and H2O2 concentrations were analyzed. And the morphology’s impacts of the light trapping structure on antireflection were discussed. Finally, only 3.6% reflectance of the light trapping layer in the range of 300-1100 nm was obtained.
  • 研究 开发
  • Yanghuan Zhang ;Zhuo-Cheng LIU
    . 2013, 44(17): 27-0.
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    Ce1-x(Eu0.5La0.5)xO2 (x = 0, 0.04) solid solutions were synthesized via hydrothermal method. The catalysis effects of solid solutions on Mg2Ni hydrogen storage properties were researched under ball milling process. XRD results showed that the particle size was reduced by adding more catalyst and extending ball-milling time. SEM indicated that the catalyst distributed uniformly on the surface of alloys, the degree of aggregation was reduced by prolonging the milling time. The electrochemical results showed that maximum discharge capacity and activation performance was enhanced, and the high rate discharge capacity showed the similar results. The doped solid solutions exhibited better catalysis effects than the pure CeO2.
  • hongsheng jia
    . 2013, 44(17): 28-0.
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    Under the conditions of high temperature and high pressure (5.6 GPa, 1400°C), the growth-type polycrystalline diamond compact (PDC) was prepared by high-pressure infiltration technology using Fe55Ni26Co19 alloy (KOV) as sintering additive. The SEM、XRD and EDS were used to investigate the morphology and phase composition of PDC; The Raman spectrum was used to calculate the residual stress of the diamonds; The wear and heat resistance of the diamond sintered body were tested. The experimental results show that the KOV evenly penetrated the diamond layer to form the dense interleaved reticular structure with the diamond particles, and the interface of PDC composite bonded firmly; The PDC phases include: diamond, WC, CoCx、α-Co and FeNi; The abrasion ratio of the PDC sintered body is 2.8×104,and its weight loss temperature is 800°C. The PDC has a smaller residual compressive stress with the value of 0.08GPa.
  • GAO Jun-GangBaojuan Tian;quanyi Yin
    . 2013, 44(17): 29-0.
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    Abstract: In this paper, the fluorine-containing self-stratifying coating was prepared by seed emulsion polymerization from acrylate and fluorine-containing acrylate. The latex coating films were characterization by Fourier transform infrared spectroscopy (FITR), Dynamic mechanical analyzer (DMA) and optical microscope and particle diameter analyzer. The results show that the non-transparence of coating film increase with increasing content of fluorine-containing latex; FTIR spectra show the content of C-F is different in the upper and down surface and it is more in upper surface than down surface. The analysis of DMA and optical microscope show that the phase separation has generated when the fluorine-containing emulsions increase and the self-stratification coating has obtained.
  • Kang DU;Zhenghou Zhu
    . 2013, 44(17): 30-0.
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    Piezomagnetic effect of Fe-based amorphous alloy ribbon was studied by applying continuous stress to Fe-based amorphous alloy ribbon and testing the nearby closed loop inductance changes. The results show that the piezomagnetic property of Fe-base amorphous alloy ribbon can be characterized by testing the nearby closed loop inductance changes of Fe-base amorphous alloy ribbon. When the frequency is equal to 1 kHz, piezomagnetic property of Fe-based amorphous alloy ribbon has a good stability. And piezomagnetic property can be raised by increasing pressure. In the same pressure cases, Fe73.5CulNb3Si13.5B9 alloy ribbon has a better piezomagnetic property than that of Fe78Si9B13 alloy ribbon. When the frequency is equal to 100 kHz, the piezomagnetic property of Fe73.5CulNb3Si13.5B9 has a better stability than Fe78Si9B13 alloy ribbon Fe73.5CulNb3Si13.5B9 alloy ribbon show the best piezomagnetic property when the frequency is equal to 1 kHz and the compressive stress is equal to 0.69 Mpa. When the compression stress is less than 0.1 Mpa, the inductance of coil has a sharp rising trend with the increase of stress, Fe-based amorphous alloy ribbon is more sensitive to tiny stress.
  • . 2013, 44(17): 31-0.
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    Using recycled coarse aggregate strength in 50MPa or greater strength of recycled aggregate concrete, mensurate the deformation capacity and durability to provide theoretical and experimental basis for application of the high strength recycled aggregate concrete in engineering. Determine the ultimate strength of recycled coarse aggregate through a series of compression test. By adjusting the water cement ratio, make the high-strength recycled aggregate concrete on strength to reach the design strength and have experiment on high-strength recycled aggregate concrete with recycled coarse aggregate replacement rate 0, 30%, 50%, 80% and 100%. When the replacement ratio of recycled coarse aggregate was 30%, it has little effect on the strength of recycled concrete. Then the strength of concrete was reducing as the recycled aggregate was increasing. High-strength recycled aggregate concrete and natural concrete have similar performance in durability. Therefore high-strength recycled aggregate concrete can be applied to engineering.
  • ; ;
    . 2013, 44(17): 32-0.
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    Natural clinoptilolite were regulated by different cations at different ion concentrations. Relationship between zeta potential of regulated zeolite and its ability for removing phosphate was investigated. And using SEM-EDS、XRD、specific surface area and pore analysis and other means to characterizate the structure.The zeta potentials of zeolites regulated by 5 g?L-1 AlCl3, 4 g?L-1LaCl3, and 1 g?L-1 AlCl3 with 3 g?L-1 LaCl3 were -33.33 mV,-20.69 mV,-30.96 mV respectively, compared -37.80 mV of natural zeolite, and their phosphate removal rates increased from 7.26% to 12.55%,92.81%,55.56% respectively. The ability of zeolite for removing phosphate is found to be positive correlation with zeta potential increase. It could be inferred that AlCl3 and LaCl3 regulations transferred positive charges onto surface of zeolite which increased the zeta potentials of zeolite therefore enhancing the abilities of zeolite for removing phosphate.Regulated zeolite of LaCl3 formed a lot of coral shaped surface structure, at the same time appeared more micro hole and specific surface area and pore size distribution also has changed greatly.