Facile cyclic ammonium salt with the smallest size for high performance electric double layer capacitors

A novel cyclic ammonium salt, N,N-dimethylpyrrolidinium tetrafluoroborate (P₁₁-BF₄), was successfully synthesized for the first time. The smallest cyclic structure of P₁₁-BF₄ induced high solubility and conductivity in PC, which can easier enter the micropores of activated carbon and occupy more surface area during charge/discharge process.     

Colorimetric Detection of Fe(II) and Co(II) by Using Terpyridine-Based Derivative

Journal of Applied Spectroscopy - A multi-ion chromogenic sensor based on a terpyridine moiety was developed for the semiquantitative, visual, and sensitive speciation analysis of Fe2+ and Co2+...     

Mesoporous material grafted with luminescent molecules for the design of selective metal ion chemosensor

Luminescent Schiff-base groups have been successfully grafted on the surface of mesoporous material MCM-48. The grafted Schiff-base groups were employed to prepare luminescent Schiff-base-Zn complex that was covalently bound to the MCM-48 surface. These luminescent mesoporous materials were characterized with X-ray, UV-VIS and emission spectroscopic methods. Experimental results demonstrated that MCM-48 modified with functional groups exhibited novel luminescent property. The chemosensing property of modified MCM-48 sample was investigated. It was demonstrated that the fluorescence of MCM-48 solid with Schiff-base groups could be completely quenched by Cu²⁺ cation and this mesoporous material was suitable for sensing Cu²⁺ cation in aqueous media.     

综合评判的神经网络方法

综合评判的方法已经广泛运用到信息，决策，管理和控制等领域，但是它的两大难点－权重和单因素评价矩阵的确定越来越来明显地展现在人们面前，本文试图用神经网络方法来解决这两个难点，并从理论上证明了这种方法的收敛性。     

Threading Chalcogenide Layers with Polymer Chains

Inserting polymers into a crystalline inorganic matrix to understand the structure, position, and the structure–property relationships of the resulting composites is important for designing new inorganic‐organic materials and tuning their properties. Single crystals of polymer‐chalcogenide composites were successfully prepared by trapping polyethyleneglycol within a selenidostannate matrix under surfactant‐thermal conditions. This work might provide a new strategy for preparing novel crystalline polymer‐inorganic composites through encapsulating polymer chains within inorganic matrices.     

Resin‐Derived Ni3S2/Carbon Nanocomposite for Advanced Rechargeable Aqueous Zn‐Based Batteries

The exploration of high‐energy and stable cathode materials is highly desirable and challenging for the development of advanced Zn‐based batteries. In this work, a facile pyrolysis method is reported to synthetize Ni₃S₂/carbon nanocomposite as high‐performance cathode by employing ion exchange resin as a precursor. Attributing to the abundant active sites and enhanced conductivity from well binding between Ni₃S₂ and carbon, a markedly high capacity of 234.3 mA h g^?1 is obtained for this Ni₃S₂/carbon at a high current density of 6.9 A g^?1. Moreover, a Zn‐based battery is demonstrated by using the Ni₃S₂/carbon as a cathode and Zn plate as an anode, which delivers a maximum power density of 58.6 kW kg^?1, together with a peak energy density of 356 W h kg^?1 and 93.7% capacity retention after 5000 charging–discharging cycles. This simple synthetic strategy to achieve robust Ni‐based composite electrodes may open up new opportunities to design other transition metal–based electrodes for energy storage applications.     

Design and synthesis of four coordination polymers generated from 2,2′-biquinoline-4,4′-dicarboxylate and aromatic bidentate ligands

Four coordination polymers [Zn(bqdc)(phen)]_n (1), [Zn(bqdc)(bpy)(H₂O)]_n (2), [Mn(bqdc)(bpy)(H₂O)₂]_n (3) and [Mn(bqdc)(phen)(H₂O)₂]_n (4) (H₂bqdc=2,2′-biquinoline-4,4′-dicarboxylic acid, phen=1,10-phenanthroline and bpy=2,2′-bipyridyl) have been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction. Crystal data for 1: monoclinic system, C2/c, , , , β=103.78(3)°, , Z=4. Crystal data for 2: monoclinic system, p2₁/n, , , , β=107.13(7)°, , Z=4. Crystal data for 3: monoclinic system, C2/c, , , , β=116.8010(11)°, , Z=4. Crystal data for 4: monoclinic system, C2/c, , , , β=117.04(3)°, , Z=4. Single helix-like chains exist in 1. The supramolecular structure of 1 exhibits extended two-dimensional network while 2-4 display extended three-dimensional architectures based on interchain hydrogen bonding and π-π interactions. Compounds 1 and 2 show blue photoluminescence under UV light suggesting that they may be employed to develop luminescent materials. Compounds 3 and 4 show interesting magnetic behaviors.     

基于苯并噻唑的新型双硼桥联梯形共轭骨架的合成、结构及其性质

设计合成了一个新型双硼桥联梯形分子.该有机分子拥有一个拓展的π共轭骨架结构.通过真空升华方法,得到了这个化合物的单晶.单晶X射线衍射分析表明该化合物拥有一个完全共平面的并七环梯形骨架.与每一个硼配位的米基基团可以有效地隔离发光单元,避免聚集诱导淬灭.化合物具有非常高的熔点和热分解温度,表明其拥有良好的热稳定性.电化学、光物理性质和理论计算研究表明,我们设计的双硼梯形共轭化合物在有机电子发光二级管器件中具有潜在的应用价值.因此,构筑了以该分子为发光层和电子传输层的器件,得到了不错的电致发光效果.     

有腹筋混凝土梁的剪切刚度分析模型

钢筋混凝土梁的挠度计算通常不计入剪切变形的贡献,然而对于斜向开裂的有腹筋混凝土梁,斜裂缝会显著降低梁体的有效剪切刚度,导致剪切变形值显著增大,因此在验算评估时应予以考虑.为评价钢筋混凝土梁斜向开裂后的有效剪切刚度,首先,基于变角桁架模型推导了钢筋混凝土梁在箍筋屈服状态下的有效剪切刚度;与弹性剪切刚度比较发现,剪切刚度退化系数的主要影响因素为材料弹模比、配箍率和斜压杆倾角.其次,基于试验剪切变形曲线表现出的刚度退化规律,提出了可用于不同开裂程度下剪切刚度计算的恒定切线刚度退化模式,并采用开裂后的剪力增量作为反映开裂程度的定量指标.最后,根据最小能量原理得到了剪切刚度退化中两个关键参数:斜压杆倾角和剪切刚度退化系数的解析公式.通过2根薄腹混凝土梁剪切变形试验以及收集的15个受剪梁段的剪切变形数据对模型有效性进行了验证,验证结果表明:有腹筋混凝土梁剪切刚度分析模型能较为准确地预测箍筋屈服状态的剪切刚度,并能反映不同开裂程度下的剪切刚度退化规律.