Effects of COOH~+ ion implantation on hemocompatibility of polypropylene

Carboxyl ion (COOH+) implantation was performed at 50 keV with different fluences for polypropylene. Hemocompatibility tests show that blood coagulation time and recalcification time of polypropylene were enhanced significantly with the increasing fluence. At the same time, the human endothelial cells grown on the surface of the implanted samples exhibited normal cellular growth and morphology. X-ray photoelectron spectroscopy and water contact angle analysis showed that COOH+ ion implantation rearranges chemical bonds and produces some new polar O-containing groups on the surface. The formation of polar functional groups, together with increase of roughness, induced an increase in hydrophilicity, which in turn improved the surface hemocompatibility of polypropylene.     

Property improvement of multilayer TiN/Ti films with C+ implantation

Using the MEVVA ion source, carbon ions have been implanted in TiN coatings deposited by multiarc ion plating. The Vickers microhardness of the C⁺-implanted TiN films increased with the increase in the ion flux and dose. X-ray diffraction (XRD) analysis showed that the TiC phases had been formed in the films. In addition, the films had the preferred growth orientations of TiN and TiC, both of which were (111) orientation after annealing at 500°C for 30 min. Auger electron spectra analysis indicated that C⁺-implanted profile was in typical Gaussian-like distribution in single films. The distribution with multipeaks of C atoms was obtained in multi-layer TiN/Ti. The possibility of the multilayer films (Ti(C,N)/TiN/Ti(C,N)/TiN and Ti(C,N)/TiC/Ti(C,N)/TiC) forming using the C-implanted TiN/Ti films is presented for the first time. Project supported by the National Natural Science Foundation of China and the “863” Hi-Tech Program of China.     

Property improvement of multilayer TiN/Ti films with C~+ implantation

Using the MEVVA ion source, carbon ions have been implanted in TiN coatings deposited by multi-arc ion plating The Vickers microhardness of the C+ -implanted TiN films increased with the increase in the ion flux and dose. X-ray diffraction (XRD) analysis showed that the TiC phases had been formed in the films. In addition, the films had the preferred growth orientations of TiN and TiC, both of which were (111) orientation after annealing at 500℃ for 30 min. Auger electron spectra analysis indicated that C+ -implanted profile was in typical Gaussian-like distribution in single films. The distribution with multipeaks of C atoms was obtained in multi-layer TiN/Ti. The possibility of the multilayer films (Ti (C, N)/TiN/Ti(C, N)/TiN and Ti(C, N)/TiC/Ti(C, N)/TiC) forming using the C-implanted TiN/Ti films is presented for the first time.     

等离子体基离子注入过程中试样温度的预测

建立了等离子体基离子注入过程中试样温度预测的理论模型,应用这个模型进行了一系列数学模拟.以纯铝为例测定了在不同的注入条件下试样的温度变化,得到的实验结果与数学模拟相符合.试验表明,低功率注入时,系统达到热平衡的时间较长,而且热平衡温度低;随功率的上升,试样升温加快;注入功率密度高时,试样容易在注入过程中达到平衡温度,而且其平衡温度受注入功率的影响较小;试样的尺寸也是影响试样温度平衡的一个主要因素.在此基础上提出了在等离子体基离子注入过程中控制试样温度的方法.     

高产植酸酶酵母Candida Krusei WZ-001的等离子束诱变选育

从土壤中筛选得到的 1株高产植酸酶酵母菌CandidaKruseiWZ 0 0 1 ,利用等离子诱变方法对这一菌株进行诱变 ,获得 1株植酸酶高产突变株 ,其酶活性比出发菌株提高了 98%。比较了N+、H+、Zn2 +3种离子注入菌体的诱变效果 ,实验结果表明N+离子注入效果最佳 ,注入最佳剂量为 5 0× 1 0 13N+/cm2 。     

离子注入甜菜杂交种效应初报

本研究以甜菜杂交种为处理材料 ,用 N 离子作为诱变源 ,以 35 kev的能量 ,分别以 40次、6 0次脉冲 ,注入剂量 4× 1 0 1 6N /cm2、6× 1 0 1 6N /cm2进行激发诱变 ,含糖率、产量均有明显的提高 ,为其它作物杂交种处理获得当代效应提供了有益参考。     

高产植酸酶酵母Candida Krusei WZ—001的等离子束诱变选育

从土壤中筛选得到的 1株高产植酸酶酵母菌CandidaKruseiWZ 0 0 1 ,利用等离子诱变方法对这一菌株进行诱变 ,获得 1株植酸酶高产突变株 ,其酶活性比出发菌株提高了 98%。比较了N+、H+、Zn2 +3种离子注入菌体的诱变效果 ,实验结果表明N+离子注入效果最佳 ,注入最佳剂量为 5 0× 1 0 13N+/cm2 。     

Analysis of current waveform in plasma based ion implantation processes

０　ＩＮＴＲＯＤＵＣＴＩＯＮＩｏｎｉｍｐｌａｎｔａｔｉｏｎｕｓｉｎｇｐｌａｓｍａｉｍｍｅｒｓｉｏｎｉｏｎｉｍｐｌａｎｔａｔｉｏｎ（ＰＩＩＩ）ｉｓａｐｒｏｍｉｓｉｎｇａｌｔｅｒｎａｔｉｖｅｔｏｃｏｎｖｅｎｔｉｏｎａｌｂｅａｍｌｉｎｅｉｏｎｉｍｐｌａ...     

Effect of lanthanum ion implantation on oxidation behavior of zircaloy

In order to investigate the effect of lanthanum ion implantation on the oxidation behavior of zircaloy at 500℃, Zircaloyspecimens were implanted by lanthanum ions with a dose range from 5×10~(16) to 2×10~(17) ions/cm~2 at room temperature, and then oxi-dized at 500℃ for 100 min. The valence of the oxides in the scale was analyzed by X-ray Photoelectron Spectroscopy (XPS). Thephase structures of the oxides in the scale were examined by Glancing Angle X- ray Diffraction (GAXRD). With the increase of im-planted lanthanum ions dose, the phase structures in the oxide scale are transformed from monoclinic zirconia to hexagonal one andthen to monoclinic one again. The measurement of weight gain showed that a similar change from the decreased gain to increasedone again is achieved in the oxidation behavior of lanthanum ion implanted zircaloy compared with that of as-received zircaloy     

Effect of Nitrogen Ion Implantation on the Structure and Corrosion Resistance of Equiatomic NiTi Shape Memory Alloy

To protect the surface of NiTi from corrosion, an ion implantation method was proposed. In the present work, a surface oxidized sample was implanted with nitrogen at energy of 100 keV. The corrosion resistarwe property was examined by the anodic polarization method in a simulated body fluid （SBF） at a temperature of 37 ℃ and contrasted to non-implanted NiTi samples. The composition and structure of the implanted layers were investigated by XPS. The experimental results from the electrochemical measurements provide an evidence that the nitrogen ion-implantation increases the corrosion resistance of NiTi shape memory alloy.     

Nanometer structure and conductor mechanism of polymer modified by metal ion implantation

Polyethylene terephthalate (PET) has been modified by Ag, Ti, Cu and Si ion implantation with a dose ranging from 1 × 1016 to 2 × 1017 ions/cm2 using a metal vapor vacuum arc (MEVVA) source. The electrical properties of PET have been improved by metal ion implantation. The resistivity of implanted PET decreased obviously with an increase in ion dose. The results show that the conductive behavior of a metal ion implanted sample is different from Si-implantation samples. In order to un-derstant the mechanism of electrical conduction, the structures of implanted layer were observed in detail by XRD and TEM. The nano carbon particles were dispersed in implanted PET. The nano metallic particles were built up in metallic ion implanted layers with dose range from 1 × 1016 to 1 × 1017 ions/ cm2. The nanometer metal net structure was formed in implanted layer when a dose of 2 × 1017ions/ cm2 is reached. Anomalous fractal growths were observed. These surface structure changes revealed conducting mechanism evo     

Study on the separation of Co2+ from Zn2+, Cd2+ by anion-exchange chromatography

The separation of Co²⁺ from Zn²⁺, Cd²⁺ by anion-exchange chromatography was discussed. The chromatographic column containing anion resin 201 × 7 which was saturated with a solution of ammonium chloride. The effects of the eluant acidity and eluant composition on the separation were investigated. The results indicate that this anion-exchange chromatography is suitable to the separation of Co²⁺ from Zn²⁺, Cd²⁺, and the condition of separation is simple and convenient. When the column is saturated with NH₄Cl solution (2.0 mol/L, pH=4.0), the separation can be completed effectively. Zn²⁺ and Cd²⁺ can also be separated when different eluants are used and the pure solution with high concentration of Zn²⁺, Cd²⁺ respectively can be obtained easily. Biography of the first author: WANG Xin-yan, born in Dec. 1975, majoring in extraction chemistry.     

Theoretical calculation and experimental study of influence of oxygen vacancy on the electronic structure and hemocompatibility of rutile TiO2

In this work, the relationship between electronic structure and hemocompatibility of oxygen deficient rutile TiO_2−x was studied by both theoretical calculation and experimental study. Based on the local density functional theory, first-principals method was performed to calculate the electronic structure of rutile TiO₂ with different oxygen vacancy concentration. In the range of less than 10% of (or equal) physically realistic O vacancy concentration, the band gap of rutile TiO₂ increases with increasing O vacancy concentration, leading the TiO₂ changes from a p-type to an n-type semiconductor. The valance band of TiO₂ is predominated by O 2p orbital, while the conduction band is occupied by Ti 3d orbital for different O vacancy concentration. The O vacancy results in the occupation of electrons at the bottom of conduction band of TiO₂, and the donor density increases with increasing O vacancy concentration. When materials come in contact with blood, the n-type semiconductor feature of oxygen deficient TiO_2−x with the bottom of conduction band occupied by electrons would prevent charge transfer from fibrinogen into the surface of materials, thus inhibiting the aggregation and activation of platelets, therefore improving the hemocompatibility of rutile TiO_2-x . Supported by the National Basic Research Program of China (Grant No. 2005CB623904), National High-Tech Research Program of China (Grant No. 2006AA02A139) and National Natural Science Foundation of China (Grant No. 20603027)     

Li^＋,Na^＋,K^＋／／Cl^——H2O体系盐类平衡液相组成的计算 …

基于电解质溶液理论列出了计算Ｌｉ＾２＋,Ｎａ＾＋,Ｋ＾＋／／Ｃｌ＾－－Ｈｉ２Ｏ四元体系溶解度的热力学平衡关系。在微机上研究了２５℃ＮａＣｌ、ＫＣｌ饱和溶液的组成,以等水线的形式反映其变化规律,绘制了带等水线的相图,并举例说明了计算结果在工艺计算上的应用。     

Effect of copper ions implantation on the corrosion behavior of ZIRLO alloy in 1 mol/L H2SO4

1. IntroductionZIRLO alloy is widely used in the nuclear industrybecause of its low thermal neutron capture cross sec-tion, favorable mechanical properties, and good corro-sion resistance. For example, ZIRLO alloy can serve asfuel cladding, spreaders for …     

空心圆管内表面等离子体源离子注入鞘层的数值模拟

建立了一维无碰撞流体动力学模型,针对柱形容器,考察了无附加电极和在中心轴线处放置零电位附加电极两种情况下,空心圆管内部等离子体鞘层的演化过程。得出了各自情况下鞘层中电势分布、离子密度分布,空心圆管内表面离子束流密度分布和离子注入剂量分布.     

空心圆管内表面等离子体源离子注入鞘层的数值模拟

建立了一维无碰撞流体动力学模型，针对柱形容器，考察了无附加电极和在中心轴线处放置零电位附加电极两种情况下，空心圆管内部等离子体鞘层的演化过程。得出了各自情况下鞘层中电势分布、离子密度分布，空心圆管内表面离子束流密度分布和离子注入剂量分布．     

FB/PP混杂纤维对混凝土性能的影响

为提高混凝土的韧性,添加水镁石纤维(FB)与聚丙烯纤维(PP)的混杂纤维制成纤维混凝土材料.进行了混凝土的工作性和力学性能试验,研究了纤维对塌落度、抗压强度、弯拉强度及劈裂抗拉强度的影响.实验结果表明:FB/PP混杂纤维可以明显提高混凝土的弯拉强度及劈裂抗拉强度,且优于单一纤维增强的效果.在总纤维用量为0.5%的情况下,随PP纤维比例的增加,混凝土的塌落度及抗压强度减少,但劈裂抗拉强度上升.混凝土的弯拉强度先上升,后下降.弯拉强度最大值出现在PP∶FB=0.2%∶0.3%左右.随水灰比的降低,单一FB纤维对混凝土强度的增强效果一般呈加强趋势,而FB/PP混杂纤维对混凝土弯拉强度增强效果降低,对混凝土的劈裂抗拉强度的增强效果加强.     

Adsorption behavior of Pb^2＋ and Cd^2＋ ions on bauxite flotation tailings

The adsorption behavior of Pb^2＋ and Cd^2＋ ions on bauxite flotation tailings was investigated to demonstrate the adsorptivity of the bauxite flotation tailings. The adsorption percentage of Pb^2＋ and Cd^2＋ ions as a function of adsorbent dosage, solution pH value and shaking time were determined by batch experiments. The maximum adsorption percentage of 99.93% for Pb^2＋ ions and 99.75% for Cd^2＋ ions were obtained by using bauxite flotation tailings as adsorbent. The methods, such as zeta potentials, specific surface area measurements and the analysis of adsorption kinetics, were introduced to analyze the adsorption mechanisms of the Pb^2＋ ions on bauxite flotation tailings. The isoelectric point of bauxite flotation tailings shifts from 3.6 to 5.6 in the presence of Pb^2＋ ions. The specific surface area of bauxite flotation tailings changes from 12.57 to 20.63 m^2/g after the adsorption of Pb^2＋ ions. These results indicate that a specific adsorption of the cation species happens on the surface of bauxite flotation tailings. Adsorption data of Pb^2＋ ions on the surface of bauxite flotation tailings can be well described by Langmuir model, and the pseudo-second-order kinetic model provides the best correlation for the adsorption data of Pb^2＋ and Cd^2＋ ions on bauxite flotation tailings.     

掺杂Li+对荧光粉YBO3:Eu3+发光性能的影响

采用反应条件温和的水热法制备Li+掺杂的YBO3:Eu3+荧光粉。通过掺入不同量的Li+研究其对荧光粉YBO3:Eu3+的物相结构、微观形貌及光致发光特性的影响。用X射线衍射(XRD),场发射扫描电镜(FESEM),荧光分光光度计及X射线能量色散谱仪(EDS)等手段表征材料性能。结果表明:Li+掺杂能够提高荧光粉YBO3:Eu3+的发光强度,最大能提高近20%。发光增强与Li+掺杂量的多少有关,同时也可能与Li+改变YBO3晶体场环境有一定关系。