Preparation of Surface Molecularly Imprinted Poly(dopamine) Film for 4-Hydroxybenzoic Acid (4-BA) Recognition by One-Step Method

In this paper, we present a one-step aqueous self-polymerization strategy to prepare surface molecularly imprinted poly(dopamine) (PDA) film. The method is simple and convenient compared with the “template-guided” surface molecularly imprinted synthesis method and the layer-by-layer self-assembly and the surface-grafted molecularly imprinted synthesis methods. The molecularly imprinted PDA films could selectively bind the template molecules (4-Hydroxybenzoic acid as a model), and bisphenol A (BPA) imprinted PDA films were also investigated. Meanwhile, the 2-dimension imprinted film material was used very conveniently.     

Analytical Modelling of Electron-coupled Ion Transfers with Immobilized vs Soluble Redox Transducer at Thick Film-modified Electrodes

Analytical theoretical solutions are deduced for the current-potential response, concentration profiles and interfacial potentials of electron-coupled ion transfers in the cyclic voltammetry with thick film-modified electrodes. The theory covers a wide variety of possible situations, namely, the redox transducer can be either immobilized on the working electrode or freely diffusing in the organic film, and the ion transfer can be either simple or complicated by homogeneous chemical processes. A comparative and comprehensive study of each case is performed, establishing the key parameters that define the behaviour of the system, as well as guidelines to analyse its electrochemical signal.     

基于CdSe/ZnS量子点薄膜结构的高双折射光子晶体光纤的色散与损耗控制

基于有限元法,设计了一种六边形排列含CdSe/ZnS量子点薄膜结构的高双折射光子晶体光纤,分析了具有不同厚度CdSe/ZnS量子点薄膜光子晶体光纤的色散及损耗特性.结果表明,含CdSe/ZnS量子点薄膜结构的光子晶体光纤在x和y方向均存在基模.当泵浦光波长逐渐增加时,具有相同厚度CdSe/ZnS量子点薄膜光子晶体光纤的双折射值逐渐增大,x和y方向总色散先增大后减小且存在两个零色散点,损耗逐渐增大并在可见光波段趋近于零;具有不同厚度CdSe/ZnS量子点薄膜光子晶体光纤随CdSe/ZnS量子点薄膜厚度的增加,在相同泵浦光波长处,双折射值逐渐减小,x和y方向总色散逐渐减小且两个零色散点逐渐靠近,损耗逐渐增大.通过沉积不同厚度CdSe/ZnS量子点薄膜和选择合适泵浦光波长,可有效控制光子晶体光纤的色散和损耗.     

Analytical theory for ion transfer–electron transfer coupled reactions at redox layer–modified/thick film–modified electrodes

Electrodes modified by liquid films or plasticized polymeric membranes containing a redox species offer valuable alternatives for the study of ion transfers and bimolecular electron transfers at liquid–liquid interfaces with conventional electrode arrangements and stable interfaces. The ion-to-electron (or electron-to-electron) transducer affects the electrochemical signal, complicating the accurate analysis of experimental data. This can be reduced through the use of an electrode surface-attached redox species of well-defined electrochemical behaviour. As will be demonstrated, the voltammetry of these systems show significant deviations with respect to individual charge transfers, which must be considered for appropriate diagnosis and quantitative analysis. For this, a simple analytical theory is presented here, deducing mathematical expressions for the current–potential response, as well as for the potential difference at the two polarized interfaces, the surface excess of the redox species and the ion interfacial concentrations.     

聚(二甲基硅氧烷-co-甲氧基十二烷基硅氧烷)在棉纤维及其他模型表面的膜形貌及定向排列方式

用场发射扫描电镜(FESEM)、原子力显微镜(AFM)、光电子能谱(XPS)等仪器研究了棉纤维以及再生纤维素表面聚(二甲基硅氧烷-co-甲氧基十二烷基硅氧烷)(DDPS)的膜形貌及其定向排列方式.结果发现,在天然棉纤维以及再生纤维素模型表面,DDPS均能形成宏观上平滑、而微观形态学实则非均一的疏水性硅膜,表明DDPS的定向排列成膜方式为疏水性硅甲基、硅十二烷基朝外伸向空气,硅氧偶极键指向基质界面.     

折射率色散效应对晶体硅太阳电池反射率的影响

为了分析色散效应对晶体硅太阳电池反射率的影响,在考虑材料折射率色散效应的情况下,运用光学干涉矩阵计算了具有SiO2单层减反射膜和MgF2/ZnS双层减反射膜晶体硅太阳电池的反射率与波长的函数关系,并与实验结果和未考虑色散效应的计算结果进行了对比分析.结果表明：考虑折射率色散效应的计算结果与实验测量数据完全相符,而未考虑折射率色散效应的计算结果与实验测量数据相差较大,最大差值分别为21.5％和16.9％.     

利用TEM对Si基片与MgO基片上生长的薄膜特性的研究

对生长在Si和MgO单晶基片上的不同厚度的单层NbN薄膜、双层薄膜AlN/NbN以及三层薄膜NbN/AlN/NbN应用透射电子显微镜(Transmission Electron Microscope,TEM)技术进行了分析研究,对这几种薄膜样品的微观结构、薄膜厚度以及各个边界的一些直观细节给出了较为清晰的图像。由透射电子显微镜的电子衍射图案计算了薄膜和单晶衬底的晶格常数,并与我们以前采用X射线衍射技术分析的结果进行了比较,结果有很好的吻合。     

适用于高电压测试的电容器分选机

分选是电容器交给用户前的最后一道质量保证工序,因而它决定了分选机的重要性。FX-120薄膜电容自动分选机主要进行容量不足检测、直流飞弧检测、直流双向耐压测试、损耗及容量测试并自动分选。主要介绍了该分选机的工作原理、基本机构、电气控制、气动控制、软件设计、关键技术及解决方案。     

X射线荧光光谱检测多层薄膜样品的增强效应研究

研究了X射线荧光光谱检测多层薄膜样品的增强效应。根据多层膜中的X荧光强度理论计算公式编写了计算机程序,并计算了Zn/Fe和Fe/Zn双层膜样品中不同薄膜厚度时Fe Kα的一次荧光强度、二次荧光强度、二次荧光与一次荧光强度比以及二次荧光在总荧光强度中比例。研究发现,在多层膜样品的X射线荧光分析中,激发条件不变的情况下,元素谱线的一次荧光相对强度、二次荧光相对强度和二次荧光在总荧光强度中所占比例都随薄膜厚度及位置的变化而变化。当Fe和Zn层厚度相同时,随厚度的变化,对于Fe/Zn样品,Fe Kα二次荧光强度占总荧光强度最高为9％,而对于Zn/Fe样品这一比例最高可达35％。