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。     

Theoretical investigation of structural and optical properties of semi-fluorinated bilayer graphene

We have studied the structural and optical properties of semi-fluorinated bilayer graphene using density functional theory. When the interlayer distance is 1.62 , the two graphene layers in AA stacking can form strong chemical bonds.Under an in-plane stress of 6.8 GPa, this semi-fluorinated bilayer graphene becomes the energy minimum. Our calculations indicate that the semi-fluorinated bilayer graphene with the AA stacking sequence and rectangular fluorinated configuration is a nonmagnetic semiconductor(direct gap of 3.46 e V). The electronic behavior at the vicinity of the Fermi level is mainly contributed by the p electrons of carbon atoms forming C=C double bonds. We compare the optical properties of the semifluorinated bilayer graphene with those of bilayer graphene stacked in the AA sequence and find that the semi-fluorinated bilayer graphene is anisotropic for the polarization vector on the basal plane of graphene and a red shift occurs in the [010]polarization, which makes the peak at the low-frequency region located within visible light. This investigation is useful to design polarization-dependence optoelectronic devices.     

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.     

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.     

Probing supported model and native membranes using AFM

Atomic Force Microscopy (AFM) has gained lots of interest since its ability to get high resolution imaging in liquid environment. In the last years, this technique was particularly successful in probing the surface of membrane model systems of biological interest and spectacular results have been obtained with native specialized membranes. In this review, we aim at highlighting the recent developments that illustrate the unique powerfulness of AFM in determining the nanoscale organization of membranes and their local physical properties. An important part will focus on AFM high resolution imaging of transmembrane proteins in model and native membranes and on the study of few applications such as biosensors. An overview of main recent developments of AFM as well as new possibilities gained by combination with other techniques will also be addressed.     

铁电双层膜中的极化翻转与极化梯度

从Ginzburg-Landau方程出发,引入自发极化梯度项,研究了铁电双层膜的电滞回线,采用平均极化来反映膜的性质.结果表明:在场强较大的情况下,两膜的平均极化与电场方向一致;在场强较小的情况下(E=-8.00×107V·m-1),膜1发生极化翻转,界面耦合占主导地位.这些新现象为设计具有多个存储态计算机存储单元提供了可能.     

FT-Raman Spectroscopic Studies on the Interaction of Metal Ions With Sphingomyelin Bilayer

The interaction of trivalent lanthanide ions and divalent calcium ions with sph-'ngomyelm bilayer has been studied by FT-Raman spectroscopy.The results showed that the bonding of metal ions to the phosphate group of sphingomyelin bi-iayer,either La3 or Ca2 did not change the conformation of the choline group,that is,O-C-C-N is still in its gauche conformation.The presence of metal ions changed the states of the interfacial region from liquid-like to amorphous state and even to crystalline.They increased the fluidity of acyl chains of sphingomyelin bilaver and made them packed disorderly.     

含萘（2,6）生色基的合成双分子膜研究

本文首次了报道系列单链、2,6-取代萘刚性生色基的双亲化合物C_nNaph(2,6)C_4N~+(CH_3)_3(n=16,12,7,4),C_(12)Naph(2,6)PO_4~-和C_(12)Naph(2,6)C_4N~+(CH_3)_2CH_2CH_2OH的合成。分别用AEM、~1HNMR和DSC考察了该系列化合物在稀水溶液中的自组织行为、聚集体内分子运动和物相变化。当n≥7时,该系列双亲化合物在稀水溶液中可自组织形成双分子层结构,亲水基团的种类直接影响双亲分子的自组织形态。