Biomembrane mimetic electrochemical sensors

Biomimetic approaches to the assembling of regular layers of electrochemical sensors make it possible to extend their performance because of the tuning shape and charge of the lipid analogs and implementation of artificial receptors in the lipid layers. The role of artificial components in modification of the properties of the surface layers and application of the nanopore devices are of particular interest. In review, recent trends in assembling modified lipid membranes and their artificial analogs with nanopores have been considered with particular emphasis on their use in electrochemical sensors.     

十二烷基磺基甜菜碱与铂电极支撑的磷脂双层膜作用的电化学研究

以铂电极支撑的磷脂双层膜(Supported Bilayer Lipid Membrane,s-BLM)作为生物膜的模型,以Fe(CN)36-和Fe(CN)64-为探针分子,利用循环伏安法(CV)和交流阻抗谱(EIS)研究两性表面活性剂十二烷基磺基甜菜碱(Dodecyl Sulfobetaine,DSB)对s-BLM相互作用。结果显示,DSB可以嵌入到s-BLM的疏水区,容易使其表面分子的排列发生变化,产生缺陷或孔洞,探针分子Fe(CN)63-和Fe(CN)64-可以通过这些微孔接近电极,产生氧化还原响应。并且作用时间、DSB的浓度以及胆固醇的存在与否对二者的相互作用有直接影响。此外作用后的双层膜在0.1mol/LKCl溶液中能够自我修复,这表明DSB与s-BLM的相互作用是可逆的。     

不锈钢支撑双层类脂膜离子传感器的电化学研究与应用

C60;分子器件;不锈钢支撑双层类脂膜离子传感器的电化学研究与应用     

Electrocaloric Effect of P(VDF-TrFE)/SrTiO_3 Bilayer Thin Films

A phenomenological thermodynamic theory is applied to investigate the effect of misfit strain and electric field on the electrocaloric effect of P(VDF-TrFE)/SrTiO 3 bilayer thin films.Theoretical results indicate that the low electric field results in the decrease of the average polarization with the increase of the relative thickness of SrTiO 3 layer,and the high electric field has an opposite effect on it.Moreover,the electrocaloric effect strongly depends on the electric field.The low electric field and the small field change can lead to a maximum of the electrocaloric effect,meanwhile the high electric field or the large field change results in the opposite trend.     

脱氧胆酸钠与支撑磷脂双层膜作用的电化学研究

以支撑磷脂双层膜(supported bilayer lipid membrane, s-BLM)作为生物膜模型, 采用循环伏安法和交流阻抗技术研究了脱氧胆酸钠(sodium deoxycholate, NaDC)与s-BLM的相互作用. 结果表明, NaDC能降低磷脂分子的有序性, 诱发s-BLM上形成孔洞或缺陷, 并且它们之间的这种相互作用对作用时间、NaDC溶液的浓度和pH值以及胆固醇的存在与否具有依赖性, 并且作用后的s-BLM在0.1 mol/L的KCl溶液中能够自我修复, 这表明NaDC与s-BLM的相互作用是可逆的.     

Noncommutative Quantum Hall Effect of Bilayer Systems

In this paper we study the bilayer quantum Hall （QH） effect on a noncommutative phase space （NCPS）. By using perturbation theory, we calculate the energy spectrum, eigenfunction, Hall current, and Hall conductivity of the bilayer QH system, and express them in terms of noncommutative parameters θ and θ^-, respectively. In our calculation, we assume that these parameters vary from laver to laver.     

电极对CuPc/C60双层异质结有机太阳能电池光学性能的影响

采用传输矩阵法的光学模型以及MATLAB软件模拟了电极对CuPc/C₆₀双层异质结有机太阳能电池光学性能的影响。模拟结果表明:当把微腔结构引入到双层异质结电池时,对于入射电极,发现活性层的吸光率主要受其反射相移的影响而非其透射率,并且通过变化入射电极相移调节层到合适厚度可以使活性层吸光率相比于传统器件增加很多;而当把正负折射率交替的光子晶体引入到电池中作为背电极时,发现活性层的吸光率和背电极反射率、反射相移都有很大关系,在获得高反射率的同时可以通过调节背电极厚度从而使活性层在整个吸收光谱内的吸光率大于传统器件。     

Thermal relaxation of exchange bias field in an exchange coupled CoFe/IrMn bilayer

This paper reports that a CoFe/IrMn bilayer was deposited by high vacuum magnetron sputtering on silicon wafer substrate; the thermal relaxation of the CoFe/IrMn bilayer is investigated by means of holding the film in a negative saturation field at various temperatures. The exchange bias decreases with increasing period of time while holding the film in a negative saturation field at a given temperature. Increasing the temperature accelerates the decrease of exchange field. The results can be explained by the quantitative model of the nucleation and growth of antiferromagnetic domains suggested by Xi H W et al. [2007 Phys. Rev. B 75 014434], and it is believed that two energy barriers exist in the investigated temperature range.     

电制备巨囊泡的方法和机理探索

利用倒置显微镜研究电制备巨囊泡,并分析其形成和成长的动力学机理.由于磷脂头部的电特性,电场对水化的磷脂双层的静电力促使磷脂膜内双层之间分离.在动力学的作用下,双层两叶的不对称受力引发其弯曲、出芽、膨胀、封闭以及相互融合.结果表明,电场参数、干磷脂膜的均匀性、缓冲液以及温度等因素影响巨囊泡的粒径、形状和稳定性.     

Condensation energy of the superconducting bilayer cuprates

In the present work, we report the interplay of single particle and Cooper pair tunnelings on the superconducting state of layered high-T _c cuprate superconductors. For this we have considered a model Hamiltonian incorporating the intra-planar interactions and the contributions arising due to the coupling between the planes. The interplanar interactions include the single particle tunneling as well as the Josephson tunneling of Cooper pairs between the two layers. The expression of the out-of-plane correlation parameter which describes the hopping of a particle from one layer to another layer in the superconducting state is obtained within a Bardeen-Cooper-Schriefer (BCS) formalism using the Green’s function technique. This correlation is found to be sensitive to the various parameter of the model Hamiltonian. We have calculated the out-of-plane contribution to the superconducting condensation energy. The calculated values of condensation energy are in agreement with those obtained from the specific heat and the c-axis penetration depth measurements on bilayer cuprates.