高分子电致发光材料研究进展

综述了近几年来国内外关于高分子聚合物在电致发光材料领域的研究进展,重点介绍了聚苯撑乙烯、聚芴类、聚噻吩类聚合物及其衍生物的相关研究成果,并讨论了当前高分子电致发光材料存在的关键问题及应用前景.     

有机发光分子在聚苯胺微结构上的选择性吸附

我们将有机发光分子选择性地吸附在PANI结构上形成有机发光图案, 作为诱导模板聚苯胺的结构可以通过纳米压印和沉积相结合的方法制备. 通过在PANI 结构的空隙处修饰氟代硅烷增大样品表面不同区域的亲疏水差异, 从而诱导有机发光分子的选择性吸附.     

在导电高分子薄膜表面沉积密度可控的银纳米粒子

<正>由于导电高分子的导电性和化学性质可以在导体和半导体区间内快速调节[1],因此其复合材料受到了越来越多的关注[2].金属纳米粒子在光电子器件、检测及传感等诸多领域表现出独特的性能[3],在生物技术领域中的重要性尤为突出[4].因此,如果将导电高分子和金属纳米粒子结合在一起,将有利于拓展导电高分子的应用范围.本文研究了银纳米粒子在聚苯胺薄膜表面的沉积行为,分别用原子力显微镜(AFM)和扫描电子显     

VRML在CAI课件设计中的应用研究

通过利用VRML制作NaCl分子晶体模型和机械横波传播模型,研究了VRML在计算机辅助教学中的应用.体现出虚拟现实技术在CAI教育中应用的优势.     

Concentration scheme for partially entangled photon states via entanglement reflector and no Bell-state analysis

We propose a protocol to concentrate partially entangled states of photons using entanglement reflector, which consists of a single electron spin confined in a charged quantum dot inside a single-sided microcavity. The outstanding advantage of the proposed scheme is its experimental simplicity and feasibility since it only needs to perform a single local measurement on electronic spins rather than a joint Bell-state measurement on photons. We then extend this scheme to concentrate N-photon Greenberger-Horne-Zeilinger state. Finally, we analyze the influence of various imperfections on the scheme.     

土壤砷含量高光谱估算模型研究

以实验室内测取的土壤反射光谱为研究对象,利用PLSR方法建立反射光谱与土壤As含量之间的模型,通过交叉验证、估算检验建模精度,探讨利用反射光谱估算士壤As含量的可行性.通过比较不同光谱预处理方法、不同光谱分辨率和不同OM含量条件下建模、验证和估算结果.表明,MSC方法可以有效去除散射的影响而取得较好的结果(估算R2=0...     

Determination of sulpiride in human urine using excitation-emission matrix fluorescence coupled with second-order calibration.

This paper proposes a new and effective approach for the quantitative analysis of sulpiride, a significant antipsychotic drug, in human urine samples by the incorporation of excitation-emission matrix (EEM) fluorescence and second-order calibration methodologies based on the alternating fitting residue (AFR) and self-weighted alternating trilinear decomposition (SWATLD) algorithms. With the application of a second-order advantage, the proposed strategy could be utilized for a direct concentration determination of sulpiride with a simple pretreatment step, even in the presence of serious natural fluorescent interferences. The average recoveries of sulpiride in complex urine samples by using AFR and SWATLD with an estimated component number of three were 101.2 +/- 2.1 and 94.4 +/- 0.7%, respectively. Moreover, the accuracy of the two algorithms was also evaluated through elliptical joint confidence region (EJCR) tests as well as the figures of merit, such as sensitivity (SEN), selectivity (SEL) and limit of detection (LOD). The experimental results demonstrated that both algorithms, as promising quantitative alternatives, have been satisfactorily applied to the determination of sulpiride in human urine, but the performance of AFR was slightly better than that of SWATLD.     

Controllable Preparation of Nanosized LiMnPO4/C with Rod-Like Morphology by Hydrothermal Method with Excellent Electrochemical Performance

The nanosized rod-like LiMnPO₄/C cathode materials have successfully in situ synthesized on the surface of flaky structure MnPO₄ · H₂O self-sacrificing template by the hydrothermal method. The crystal microstructure, micro shape, and electrochemical parameters of LiMnPO₄/C are comprehensively studied by XRD, SEM, TEM, and electrochemical measurement methods. The physical and chemical properties analysis confirms that the vinyl acetate solution (VAc-H₂O) with a proper molar ratio is beneficial to generate orthorhombic olivine structure LiMnPO₄ with microporous structure and nanorod-shaped morphology. The electrochemical measurement results indicate that LMP-X1-AA sample delivers an initial discharge capacity of 148.1 mAh g⁻¹ at 0.05 C, the capacity retention rate still maintains at 89.2% after 200 cycles. As the discharge rate increases to 1 C, the discharge capacity still remains at 133.4 mAh g⁻¹. The results indicate that the synergistic effect of nanosized rod-like morphology and conductive carbon coating is beneficial to improving the lithium ions diffusivity and electrochemical properties of LiMnPO₄ materials.     

羧酸桥联的四核镧系簇合物的磁热效应和慢磁弛豫

在水热条件下,通过使用羧酸和螯合配体得到了一个系列的四核镧系簇合物,即[Ln₄(mnba)₁₂(tzp)₂(H₂O)₂](Ln=Gd(1),Tb(2),Er(3);Hmnba=间硝基苯甲酸;tzp=2-(1H-1,2,4-三唑-3-基)吡啶))。这3个化合物是同构的,且具有线性的四核簇结构。磁性研究表明,化合物1和3中簇内镧系离子之间是弱铁磁耦合的,但化合物2中铽离子之间是弱的反铁磁相互作用和(或)铽离子激发的斯塔克能级的去布居。化合物1具有较大的磁热效应(-ΔS_m^max=20.6 J·kg^-1·k^-1)。交流磁化率测试表明化合物3展现出频率和温度依赖的虚部信号,这是慢磁弛豫的典型特征,原因是铒离子的强各向异性和铁磁耦合的存在。     

DMSO作为新的合成子在有机合成中的应用研究进展

二甲亚砜(DMSO)不但可以作为有机溶剂,同时还可以作为反应试剂,在有机合成中得到了广泛的应用.由于其具有来源广、价格低廉、操作简单等优点,近年来将DMSO作为反应试剂应用于有机合成反应引起了广大化学家的关注.本文作者对近几年来DMSO作为合成子在有机合成中的应用按照引入官能团的种类进行了总结,详细阐述了其转化为甲磺酰基、甲酰基、氰基、甲硫基等官能团的方法学研究,以期为开发DMSO新的应用提供参考依据.