聚醚—无机盐复合物导电性的研究进展

叙述了聚醚－无机盐复合物的导电性的研究状况，分析了复合物导电性的影响因素，阐述了提高聚醚－无机盐复合物导电性的方法。     

层状三元簇合物的电子结构和导电性研究——(Ⅰ)D型ABO_2化合物的电子结构和导电机理

本文采用SCCC—EHMO法,研究了D型ABO_2化合物的电子结构与导电性等关系,提出了一个双子晶格导电新模型,系统地解释了该类簇合物的导电性,总结了若干结构规律,给出了判别导电性的量子化学指标。     

稀土双(11-钨硅酸)钾的质子导电性研究(英)

研究了K13［Ln（SiW11O39）2］nH2O（Ln=La，Ce，Pr，Nd，Sm，Gd）的质子导电性研究表明其导电性不仅与物质本性有关，也与外界条件如温度、频率等有关，不同结构的杂多化合物给出不同结构的质子导电性．总结了质子导电性随温度、结晶水数目、频率的变化总趋势．基于实验数据得出一些重要结论，所得数据未见文献报道．     

DNA的导电性浅析

DNA是构成生命基础的最重要分子,DNA是否导电以及怎样导电,关系到我们对生命信号的传递、和对生命和生命现象的深入理解和揭示,以及可编程DNA分子电子学的发展,国际科技界一直高度关注,近二十年来也一直是研究的热点和难点.然而,DNA是一个复杂的体系,其导电性问题仍然不清楚,备受争议.本综述中,我们简述了DNA导电性问题的研究历史,分析了DNA导电性问题争议的主要原因,总结了DNA导电性研究中存在的主要问题,其主要归因于测量方法的多样性和DNA分子的复杂性.最后,对DNA导电性研究的未来发展方向进行了展望,DNA导电性在生命信号传递、生物传感器、分子电子学等领域具有巨大的应用潜力,其研究也将为生物科学和电子学的融合提供新思路.     

微量稀土对超导稳定化基体铜材的性能和组织的影响

研究了微量稀土元素对铜的机械性能、导电性和组织的影响，在铜中加入微量钇、钕、镝、铒和富铈混合稀土后，使铜的抗拉强度有所提高，并保持良好的塑性和导电性。     

疏水化水溶性两性纤维素接枝共聚物与粘土的相互作用

运用紫外光谱法研究了疏水化水溶性两性纤维素接枝共聚物(羧甲基纤维素接枝丙烯酰胺及N,N 二甲基辛基(2 甲基丙烯酰氧乙基)溴化铵的共聚物, CGAO)在粘土上的吸附,考察了聚合物浓度、无机盐浓度、温度、 pH、 表面活性剂和粘土浓度等因素对CGAO在粘土上吸附量的影响,以及通过X射线衍射分析了CGAO在粘土上的吸附位置.结果表明， CGAO在粘土上的吸附规律与一般聚合物有很大差别,而且CGAO未深入到粘土晶层间,只在其表面吸附. 粘土与CGAO作用前后的粒度分析表明CGAO对粘土粒子有很好的桥接聚集作用. 扫描电镜分析显示粘土与CGAO作用后,其颗粒形态发生了显著变化.     

聚合物/粘土纳米复合材料中的粘土有机化

回顾了聚合物/粘土纳米复合材料中所用粘土的有机化方法与有机粘土的热稳定性,及其对复合材料性能的影响,指出在聚合物/粘土复合材料中粘土片层间距的变化同样有可能受到层间插层剂构象变化的影响、聚合物/粘土纳米材料的长期热氧稳定性与热失重结果可能不一致。     

含DMIT配体配合物的结构与导电性

本文描述了含DMIT(4,5-二硫基-1,3-二硫杂环戊烯-2-硫酮)配体配合物的含成和导电性,讨论了其各个结构层次及其与导电性的关系。Ni、Pd、Pt、的DMIT导电配合物的分子结构特征是平面构型和离域π电子态,晶体结构特征是配位阴离子堆砌成各种形式的、导电能力不同的分子柱和分子层,作为非导电组元的平衡离子对导电性也有重要影响。     

共轭聚席夫碱的掺杂及其导电性

共轭聚席夫碱的掺杂及其导电性李春生顾尧刘长欣（山东建材学院应化系济南２５００２２）关键词共轭聚合物聚席夫碱掺杂导电性中图分类号Ｏ６３１．２３自１９７７年发现聚乙炔掺杂后具有导电性［１］，人们对导电聚合物的研究投入了很大的热情。以后又相继发现了聚对苯撑...     

四硫富瓦烯衍生物/硬脂酸LB膜的导电性研究

报导了14种四硫富瓦烯衍生物／硬脂酸LB膜的导电性，并解释了硬脂酸量和碘蒸气掺杂对LB膜导电性的影响．     

双(三氟甲基磺酰)亚胺钠基聚合物电解质在固态钠电池中的性能

采用简单的溶液浇铸法制备出由双（三氟甲基磺酰）亚胺钠（NaTFSI）/聚氧乙烯（PEO）构筑的固态聚合物电解质（SPE）,并针对其相转变、结晶性、热稳定性、电导率以及电化学稳定性等基础理化及电化学性质进行了系统表征。结果表明,NaTFSI/PEO（[EO]/[Na⁺]=15）SPE具有相对高的电导率（σ ≈ 10^-3 S·cm^-1,80℃）、高的耐氧化能力（4.86 V vs Na⁺/Na）和热稳定性高达350℃。电池测试结果表明,该NaTFSI基SPE不仅对金属钠电极能够呈现出优异的界面稳定性,而且在Na|SPE|NaCu_1/9Ni_2/9Fe_1/3Mn_1/3O₂电池中展现出良好的循环和倍率性能。     

Li1.5Al0.5Ge1.5(PO4)3基固体复合电解质的制备及锂离子导电行为

将聚氧化乙烯(PEO)和二(三氟甲基磺酰)亚胺锂(LiTFSI)混合(固定EO/Li摩尔比为13)后, 采用溶液浇注法制备了一系列不同Li_1.5Al_0.5Ge_1.5(PO₄)₃(LAGP)与PEO质量比的LAGP-PEO(LiTFSI)固体复合电解质体系. 结合电化学阻抗法、 表面形貌表征以及与惰性陶瓷填料(SiO₂, Al₂O₃) 性能的对比分析, 探讨了LAGP在固体复合电解质中的作用机理以及锂离子的导电行为. 结果表明, 在以LAGP为主相的固体复合电解质中, PEO主要处于无定形态, 整个体系主要为PEO与LiTFSI的络合相、 LAGP与PEO(LiTFSI)相互作用形成的过渡相和LAGP晶相. 其中LAGP作为主要的导电基体不仅起到降低PEO结晶度、 改善两相导电界面的作用; 同时自身也可以作为离子传输的通道, 降低锂离子迁移的活化能, 从而使离子电导率得到提高. 当LAGP与PEO的质量比为6:4时, 固体复合电解质的成膜性能最好, 离子电导率最高, 在30 ℃时为2.57×10^-5 S/cm, 接近LAGP的水平, 电化学稳定窗口超过5 V.     

Nanomolar detection of dopamine in the presence of ascorbic acid at β-cyclodextrin/graphene nanocomposite platform

Nanocomposite of β-cyclodextrin and graphene sheet (β-CD/GS) was successfully prepared, which exhibited high stability in aqueous solution. When used in electrochemical detection of dopamine, the β-CD/GS modified carbon electrode showed low detection limit, broad linear range, along with good ability to suppress the background current from large excess ascorbic acid. The electrochemical reaction of dopamine on the β-CD/GS showed a mass diffusion-controlled process, which was different from the adsorption-controlled process on the unmodified graphene sheet.     

Electrochemical Performance of Solid Polymer Electrolyte PEO_(20)-LiTf-Urea_(1.5)

A new solid polymer electrolyte PEO20-LiTf-Urea1.5 was prepared by solution casting technique. The energy of frontier orbitals for the components of the electrolyte was predicted by quantum chemistry calculations, and TG stability and electrochemical features were measured. Urea exhibited a lower HOMO energy than PEO, implying its enhanced stability against electrochemical oxidation. Experimentally addition of urea increases the ionic conductivity, which guarantees conductivity requirement for lithium ion b...     

A novel PEO-based composite solid-state polymer electrolyte with methyl group-functionalized SBA-15 filler for rechargeable lithium batteries

Functionalized molecular sieve SBA-15 with trimethylchlorosilane was used as an inorganic filler in a poly(ethyleneoxide) (PEO) polymer matrix to synthesize a composite solid-state polymer electrolyte (CSPE) using LiClO₄ as the doping salts, which is designated to be used for rechargeable lithium batteries. The methyl group-functionalized SBA-15 (^fSBA-15) powder possesses more hydrophobic characters than SBA-15, which improves the miscibility between the ^fSBA-15 filler and the PEO matrix. The interaction between the ^fSBA-15 and PEO polymer matrix was investigated by scanning electron microscopy, X-ray diffraction, and differential scanning calorimetry. Linear sweep voltammetry and electrochemical impedance spectroscopy were employed to study the electrochemical stability windows, ionic conductivity, and interfacial stability of the CSPE. The temperature dependence of the change of the PEO polymer matrix in the CSPE from crystallization to amorphous phase was surveyed, for the first time, at different temperature by Fourier transform infrared emission spectroscopy. It has demonstrated that the addition of the ^fSBA-15 filler has improved significantly the electrochemical compatibility of the CSPE with a lithium metal electrode and enhanced effectively the ion conductivity of the CSPE. Dedicated to Professor Oleg Petrii on the occasion of his 70th birthday on August 24th, 2007.     

Plasma electrolytic oxidation of AZ91D magnesium alloy in biosafety electrolyte for the surgical implant purpose

Plasma electrolytic oxidation (PEO) of AZ91D magnesium alloy in biosafety electrolyte was studied. The prepared PEO coating and its stability in the simulated body fluid (SBF) were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectrometry (EDS), potentio-dynamic polarization, electrochemical impedance spectroscopy (EIS) and immersion test. The SEM results show that a kind of smooth, compact and well adhesive PEO coating is prepared in the proposed biosafety electrolyte. The electric analytical results show that the corrosion resistance of the PEO coating is excellent even in harsh environment. Immersion test shows that the PEO coating is stable enough in the SBF solution. The weight loss, the average corrosion rate and the pH variation of the PEO treated magnesium alloy are far lower than the untreated ones. From these highly positive results, the proposed PEO process is promising in the treatment of the surgical magnesium alloy materials.     

Polymer Solvents For Electrochemical Reactions

Solubility of inorganic salts and potential window of poly(ethylene oxide) (PEO) were analyzed. Sufficient potential window (?1.6 to + 1.6 V vs Ag) was obtained for salt-containing PEOs when the ionic conductivity of the PEOs was higher than 3.0 × 10^?4 S/cm. PEO was then used as a polymer solvent for electrochemical redox reactions of heme proteins. Myoglobin was solubilized in salt-containing PEO oligomers only after PEO modification, and their reversible redox reactions were confirmed. The electrochemical reduction was slow because of the very low diffusion coefficient of the proteins in PEO oligomers. PEO-modi-fied myoglobin and hemoglobin showed reversible electron transfer reaction with ITO glass electrode at even 80 or 100°C in PEO oligomers.     

A new composite polymer electrolyte based on poly(ethyleneoxide)/ polysiloxane/BMImTFSI/organomontmorillonite

Composite polymer electrolytes based on poly(ethylene oxide)-polysiloxane/l-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide/organomontmorillonite(PEO-PDMS/1L/OMMT) were prepared and characterized.Addition of both an ionic liquid and OMMT to the polymer base of PEO-PDMS resulted in an increase in ionic conductivity.At room temperature,the ionic conductivity of sample PPB100-OMMT4 was 2.19×10~3 S/cm.The composite polymer electrolyte also exhibited high thermal and electrochemical stability and may potentially be applied in lithium batteries.     

Highly ion conductive poly(ethylene oxide)-based solid polymer electrolytes from hydrogen bonding layer-by-layer assembly

We report the development of a solid polymer electrolyte film from hydrogen bonding layer-by-layer (LBL) assembly that outperforms previously reported LBL assembled films and approaches battery integration capability. Films were fabricated by alternating deposition of poly(ethylene oxide) (PEO) and poly(acrylic acid) (PAA) layers from aqueous solutions. Film quality benefits from increasing PEO molecular weight even into the 10(6) range due to the intrinsically low PEO/PAA cross-link density. Assembly is disrupted at pH near the PAA ionization onset, and a potential mechanism for modulating PEO:PAA ratio within assembled films by manipulating pH is discussed. Ionic conductivity of 5 x 10(-5) S/cm is achievable after short exposure to 100% relative humidity (RH) for plasticization. Adding free ions by exposing PEO/ PAA films to lithium salt solutions enhanced conductivity to greater than 10(-5) S/cm at only 52% RH and tentatively greater than 10(-4) S/cm at 100% RH. The excellent stability of PEO/PAA films even when exposed to 1.0 M salt solutions led to an exploration of LBL assembly with added electrolyte present in the adsorption step. Fortuitously, the modulation of PEO/PAA assembly by ionic strength is analogous to that of electrostatic LBL assembly and can be attributed to electrolyte interactions with PEO and PAA. Dry ionic conductivity was enhanced in films assembled in the presence of salt as compared to films that were merely exposed to salt after assembly, implying different morphologies. These results reveal clear directions for the evolution of these promising solid polymer electrolytes into elements appropriate for electrochemical power storage and generation applications.     

Poly(oxyethylene) and ramie whiskers based nanocomposites: influence of processing: extrusion and casting/evaporation

Polymer nanocomposites were prepared from poly(oxyethylene) PEO as the matrix and high aspect ratio cellulose whiskers as the reinforcing phase. Nanocomposite films were obtained either by extrusion or by casting/evaporation process. Resulting films were characterized using microscopies, differential scanning calorimetry, thermogravimetry and mechanical and rheological analyses. A thermal stabilization of the modulus of the cast/evaporated nanocomposite films for temperatures higher than the PEO melting temperature was reported. This behavior was ascribed to the formation of a rigid cellulosic network within the matrix. The rheological characterization showed that nanocomposite films have the typical behavior of solid materials. For extruded films, the reinforcing effect of whiskers is dramatically reduced, suggesting the absence of a strong mechanical network or at least, the presence of a weak whiskers percolating network. Rheological, mechanical and microscopy studies were involved in order to explain this behavior.