30 November 2012, Volume 43 Issue 22

    

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研究与开发
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  Adsorption Behavior of Bovine Serum Albumin on Titania Nanotube arrays

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  . 2012, 43(22): 1-0.

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  Highly ordered and uniform TiO2 nanotube arrays were fabricated by anodic oxidation of titanium foil in ethylene glycol containing NH4F and deionized water. The morphology and surface area of TiO2 nanotube arrays were characterized by scanning electron microscope (SEM) and specific surface area measuring instrument, respectively. The diameter, the length and the surface area of TiO2 nanotube arrays are, about 180 nm, over 230 μm and 59.8 m2/g, respectively. Then, the adsorption and desorption behavior of bovine serum albumin on TiO2 nanotube arrays were investigated. The results showed that the adsorption ability of bovine serum albumin was affected by pH value, initial concentration of BSA and ionic strength, respectively. The desorption of bovine serum albumin from TiO2 nanotube arrays were affected by pH value of PBS. Bovine serum albumin easily released from TiO2 nanotube arrays in alkaline conditions, and appeared diffusion-limited benefits.
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  Red electroluminescent devices based on rubrene derivative dopant and its lighting application

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  . 2012, 43(22): 2-0.

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  A rubrene (Ru) derivative, 2-formyl-rubrene was synthesized and was used as red dopant in N,N'-bis-(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl- 4,4'-diamine (NPB) host in organic light-emitting devices (OLEDs) that offers an emission peak at ~598 nm and a current efficiency of 2.1 cd/A. The red emitter was also used to fabricate a white OLED (WOLED), in which 2-formyl-rubrene, tris-(8-hydroxyquinoline) aluminum (Alq3) and NPB contribute to the red, green and blue emissive components respectively. As a result, a high color rendering index of 89.8, CIE coordinates of (0.33, 0.33) at 11 V as well as a maximum luminance of 5 000 cd/m2 and a luminance efficiency of 4.7 cd/A were obtained. The performances suggest its potential applications for solid-state lighting. Also, the design and electroluminescent processes of the WOLED based on 2-formyl-rubrene were also discussed.
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  Effect of modification and heat treatment on microstructure and wear properties of Al-Si-Fe/Al-20Si composite

  Wen-sheng HOU;

  . 2012, 43(22): 3-0.

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  In-situ Al-Si-Fe/Al-20Si composites were fabricated from Fe and Al-20Si. The composites were modified with Mn, Sr, Y. The samples were treated by T6 heat treatment. The microstructure and the tribological properties of composites at room temperature were investigated. The results indicate that wear resistance of the modified composites were much better than that of Al-20Si alloy. The wear resistance of all samples with heat treatment is better than that without heat treatment. The composite modified with Sr shows the best wear resistance among the as-cast composites, while the best one among the heat-treated composites is that modified with Y. Analysis shows that the shape and the size of the iron-rich phase and eutectic Si phase have significant influence on the wear resistance of the composites. The iron-rich phase and the matrix with high strength in the heat-treated composites could promote the formation of tribolayer and improve the wear resistance.
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  Fabrication of carbon nanofibers with ordered macroscopic structures and its application

  Qiang Wu;

  . 2012, 43(22): 4-0.

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  Carbon nanofibers (CNFs) were synthesized on ordered macroscopic substrates (silica fiber, alumina fiber) via chemical vapor deposition (CVD) technique, by using CH4 as carbon resource and Nickel as catalyst. Field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), Raman spectra and Thermal gravimetric analysis (TG) were employed to investigate the morphologies, structures and phases of the obtained CNFs. The results showed that CNFs grew with orientation, and dense and orderly CNFs layer was formed on the ordered macroscopic substrates; Compared with alumina fiber, silica fiber tends to easily generate high quality CNFs; The obtained CNFs followed the tip-growing mode; In addition, nanofibrous LaMnO3 with ordered macroscopic shapes can be obtained in situ by using CNFs as template. It turned out that the obtained nanofibrous LaMnO3 can greatly decrease the combustion temperature of soot, which has potential application prospects.
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  Effect of coronary stent design parameters on the mechanical property of the elastic recoil of stent

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  . 2012, 43(22): 5-0.

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  Coronary stent is an important device used in Percutaneous Transluminal Coronary Angioplasty (PTCA), which is usually implanted to support the stenosed artery. Low elastic recoil has become an essential feature of new coronary stents. The primary aim of this investigation was to investigate the effects of varying stent “design parameter” on the elastic recoil of stent by using the finite element method (FEM). The finite element model to evaluate elastic recoil of stent was set up based on the stent prototype testing. The results show that the amplitude and the number of crowns are the dominant parameter in this study. Increasing either strut width or thickness generally decreases elastic recoil of stent. However, increasing either amplitude or radius of curvature or the number of crowns generally increases it. In conclusion, FEM can quantify some mechanical behaviors of stent and help surgeons to select stent and designers to optimize stent.
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  The Study of an in-situ online measurement system detecting internal microstructure of fibers on synchrotron radiation SAXS

  Xue-Ping GAO;

  . 2012, 43(22): 6-0.

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  An in-situ online measurement system that detects internal structure of fibers on synchrotron radiation facility is studied, using remote computer control, by the means of synchrotron radiation SAXS, which can detect the inner micro defect in-situ online. The relationships between process and inner structure can be characterized by the in-situ online measurement system，which is the key for manufacture high performance fiber. By debugging and testing, the system can test the structure changes of carbon fiber, aramid fiber and uhmwpe fiber in-situ online under different temperture, different strain or different atmosphere.
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  Preparation and Adsorption Properties of Lithium- ion Sieve Membrane with PVDF

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  . 2012, 43(22): 7-0.

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  A series of lithium-ion sieve precursor membrane with different amounts of spinel-type manganese oxide (Li1.6Mn1.6O4) were prepared by the phase-inversion process. The membrane was treated with HCl solution to extract lithium, resulting in the lithium-ion sieve membrane. The structure and properties of the prepared lithium-ion sieve precursor membranes were characterized by means of SEM, XRD and adsorption experiments. Adsorption experiments show that adsorption capacity of membrane-type adsorbents increase with the amount of Li1.6Mn1.6O4 from 5% up to 15%. Further increasing the amount of Li1.6Mn1.6O4, the adsorption capacity of membrane-type adsorbents decreases. It indicates that the optimal content of Li1.6Mn1.6O4 embedded into the PVDF polymer matrix is 15% with the maximums adsorption capacity of 6.98(102mg/cm2).
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  Performance and preparation of foamed waste paper pulp reinforced starch-based composites

  . 2012, 43(22): 8-0.

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  The foamed composite could be completely biodegradable which was mainly prepared by corn starch and PVA, reinforced by waste pulp paper, foamed by NH4HCO3，plasticized by the mixed plasticizer of glycerol/urea and other adjuvants by extrusion foaming method. Then, the foamed composites’ density, foam expansion ratio, water absorbability, rebound rate, cell morphology and the effect of mixed plasticizer on the plastication of cornstarch were discussed. The results showed that the density decreased with increasing NH4HCO3 content, then increasing. When the content of NH4HCO3 was 1.2%, the composite had the lowest value which was 0.16 g.cm-3. The foam expansion ratio, water absorption rate and increase in length were all increasing with increasing NH4HCO3 content, then decreasing. When the content of NH4HCO3 was 1.2%, they had the highest values. The number of cell firstly increased with increasing NH4HCO3 content, then decreasing. The side of cell became larger with increasing content of NH4HCO3. When waste pulp paper content was 20%, the number of cell was most and the side of cell was small and distributed well. When mixed plasticizer content was 30%, starch and waste pulp paper had good compatibility, the number of cell was more and the side of cell distributed well.