荧光探针可视化检测水溶液中铜离子

设计并合成了一例罗丹明B衍生物D2.作为专一识别Cu2+的探针,在2 ×10-5 mol/L HEPESCH3CN(1:1,V/V,含0.1 mol/L NaN03,pH=7.4)溶液中,D2本身无颜色,荧光微弱;加入Cu+后,溶液很快呈现粉红色,并且荧光增强2.7倍,而对其它常见金属离子都没有响应.紫外吸收光谱显示D...     

脉冲高能量密度等离子体法类金刚石膜的制备及分析

利用脉冲高能量密度等离子体法在光学玻璃衬底上、在室温下成功的制备了光滑、致密、均匀的纳米类金刚石膜.工艺研究表明：放电电压和放电距离以及工作气体种类对纳米类金刚石膜的沉积起着关键作用.利用拉曼光谱、扫描电镜以及电子能量损失谱分析薄膜的形态结构表明：薄膜具有典型的类金刚石特征；纳米类金刚石膜的晶粒尺寸小于20nm甚至为非晶态；类金刚石膜中含有一定量的氮原子，随着沉积能量的升高，氮的含量增大.纳米类金刚石膜的薄膜电阻超过109Ω/cm2.对放电溅射过程进行了理论分析，结果与工艺研究的结论吻合.     

Fabricating a reactive surface on the fibroin film by a room-temperature plasma jet array for biomolecule immobilization

A simple dielectric barrier discharge(DBD) jet array was designed with a liquid electrode and helium gas.The characteristics of the jet array discharge and the preliminary polymerization with acrylic acid(AA) monomer were presented.The plasma reactor can produce a cold jet array with a gas temperature lower than 315 K,using an applied discharge power between 6 W and 30 W(V dis × I dis).A silk fibroin film(SFF) was modified using the jet array and AA monomer,and the treated SFF samples were characterized by atomic force microscopy(AFM),scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),and contact angle(CA).The deposition rate of the poly acrylic acid(PAA) was able to reach 300 nm/min,and the surface roughness and energy increased with the AA flow rate.The FTIR results indicate that the modified SFF had more carboxyl groups(-COOH) than the original SFF.This latter characteristic allowed the modified SFF to immobilize more quantities of antimicrobial peptide(AP,LL-37) which inhibited the Escherichia coli(E.Coli) effectively.     

Surface diffuse discharge mechanism of well-aligned atmospheric pressure microplasma arrays

A stable and homogeneous well-aligned air microplasma device for application at atmospheric pressure is designed and its electrical and optical characteristics are investigated. Current-voltage measurements and intensified charge coupled device(ICCD) images show that the well-aligned air microplasma device is able to generate a large-area and homogeneous discharge at the applied voltages ranging from 12 kV to 14 kV, with a repetition frequency of 5kHz, which is attributed to the diffusion effect of plasma on dielectric surface. Moreover, this well-aligned microplasma device may result in the uniform and large-area surface modification of heat-sensitive PET polymers without damage, such as optimization in hydrophobicity and biocompatibility. In the biomedical field, the utility of this well-aligned microplasma device is further testified. It proves to be very efficient for the large-area and uniform inactivation of E. coli cells with a density of 103/cm~2 on LB agar plate culture medium, and inactivation efficiency can reach up to 99% for 2-min treatment.     

Characteristics of sealed plasma electrolytic oxidation coatings with electrochemical impedance spectroscopy

<正>Plasma electrolytic oxidation(PEO) coatings are prepared on aluminium with graphite powders added into the electrolyte.The scanning electron microscopy(SEM) coupled with an energy dispersive x-ray analysis system(EDX) is used to characterize the surface and the cross-section morphologies of the coatings.The electrochemical impedance spectroscopy(EIS) is used not only to evaluate the corrosion resistance but also to analyse the structure of the coating. Results show that graphite powders are embedded in the PEO coating.The corrosion resistances of both the inner barrier and the outer porous layer are greatly improved,and the EIS could give some valuable detailed information about the coating structure.     

火焰原子吸收光谱法间接测定食品中碘

微量碘的测定一般采用光度法。本文依据 [Ｃｄ(Ｐｈｅｎ) 3]2 + 与Ｉ- 可形成 [Ｃｄ(Ｐｈｅｎ) 3]2 + (Ｉ- ) 2 离子对的原理[1] ,用硝基苯萃取 ,通过测定有机相中镉的含量 ,间接测定碘。用于测定含碘食品 ,结果满意。1　试验部分1.1　主要仪器与试剂ＷＦＸ 1Ｂ型原子吸收分光光度计 (北京第二光学仪器厂 )ｐＨＳ Ⅰ型酸度计 (上海分析仪器厂 )涡流混合器 (上海第一医学院仪器厂 )碘标准储备液 :10ｍｇ·ｍｌ- 1,准确称取碘化钾(ＧＲ) 13.0 80 0ｇ ,用少量无碘水溶解后 ,定容于 1Ｌ容量瓶中。碘标准使用液为 1ｍｇ·Ｌ- 1。三邻菲罗啉镉溶液…     

Pulsed Ion Sheath Dynamics in a Cylindrical Bore for Inner Surface Grid—Enhanced Plasma Source Ion Implantation

Based on our recently proposed grid-enhanced plasma source ion implantation(GEPSII) technique for inner surface modification of materials with cylindrical geometry,we present the corresponding theoretical studies of the temporal evolution of the plasma ion sheath between the grid electrode and the target in a cylindrical bore.Typical results such as the ion sheath evolution,time-dependent ion density and time-integrated ion energy distribution at the target are calculated by solving Poisson‘s equation coupled with fluid equations for collisionless ions and BOltzmann assumption for electrons using finite difference methods.The calculated results can further verifty the feasibility and superiority of this new technique.     

CT-6B托卡马克的电子迴旋波加热实验

分别使用频率为34.34GHz和20.1GHz的迴旋管系统从外侧和顶端注入微波,对CT-6B托卡马克等离子体加热,均观察到明显的加热效果。分析表明两者有不同的加热机制。前者主要属于O模的共振加热;后者为X模的非共振-高密度加热,其机制可能来源于高密度截止层附近的非线性现象。在两种实验中,都观测到称为二次加热的非线性加热现象。它们可能分别来自不同的物理机制。     

THE ELECTRON CYCLOTRON RESONANCE HEATING EXPERIMENTS ON HL-1 TOKAMAK

The electron cyclotron resonance heating (ECRH) experiments on HL-1 tokamak with 300kW of power generated by a gyrotron are described. With ECE diagnostics, a 30% increase of electron temperature has been obtained. The following phenomena have been observed with various diagnostics during ECRH: increase of radiation intensity of soft X-ray;amplitude change and period elongation of sawtooth oscillation; MHD instability suppression; increase of Hα spectral fine intensity and ionized impurity radiation from edge plasma;increase of the temperature and density of edge plasma. Although the total plasma energy content increases, the energy confinement time is decreased. Initial results of low voltage start-up experiments have also been obtained.