铜在硝酸介质苯并三唑抛光液中化学-机械抛光时的电化学行为

用电化学测试技术研究了硝酸、苯并三唑及H2O2浓度对铜表面的成膜及铜抛光过程的影响.测试了各种体系中铜的交流阻抗及其影响因素，探讨了腐蚀电流密度与抛光压力、抛光转速的关系，考察了化学-机械抛光过程中腐蚀电位及极化曲线的变化规律. 用腐蚀电流密度及腐蚀电位等电化学变量的变化解释了抛光过程的电化学机理，证明在硝酸溶液介质中，以苯并三唑为成膜剂、H2O2为助剂、纳米g -Al2O3为磨粒的抛光液配方是可行的.     

丙烯酸系有机亲水涂料制备研究

亲水涂料主要用于空调热交换器翅片表面,以提高其亲水性、耐蚀性等。本文采用丙烯酸(AA)/丙烯酰胺(AM)水溶液共聚法制备高亲水树脂,同时对交联剂及涂料的pH值对涂膜的影响进行了研究。     

La_(1-x)Ce_xMnO_3微波吸收特性

用溶胶-凝胶法制备了La1-xCexMnO3(x=0.1,0.2,0.3,0.4,0.5)样品,用微波矢量网络分析仪测试了该样品在2～18 GHz微波频率范围的复介电常数、复磁导率,根据测量数据计算了电磁损耗角正切及微波反射率与频率的关系.结果表明,在x=0.4时,样品微波吸收效果最好.当样品厚度为2.20 mm、x=0.4时,吸收峰值为27 dB,10 dB以上频带宽度达3.2 GHz.初步探讨了该材料的电磁损耗机理,发现损耗吸收来自磁损耗和介电损耗的共同作用,吸收峰所在频率介于介电损耗角正切最大值与磁损耗角正切最大值对应的频率之间,即在13.2 GHz附近.对样品的电阻率测试表明,其室温范围内电导在半导体范围内,有利于降低微波在样品表面的反射率.     

Electrochemical behavior of diverse vanadium ions at modified graphite felt electrode in sulphuric solution

PAN-based graphite felt (PGF) treated in 98% sulphuric acid for 5 h and then kept at 450 ℃ for 2 h was evaluated for their electrochemical performance as electrodes of vanadium redox battery (VRB). Structure and characteristic of treated PAN-based graphite felt (TPGF) were determined by means of Fourier Transform Infrared Spectroscopy, Scanning Electron Microscopy, Brunauer-Emmett-Teller surface area analysis and VRB test system. The results show that the acid and heat synergistic effect increase the number of —COOH functional groups on the PGF surface, and the PGF is eroded by sulphuric acid oxidation, resulting in the surface area increases from 0.31 m2/g to 0.45 m2/g. The V(Ⅱ)/V(Ⅲ) redox reaction is electrochemically reversible on the TPGF electrode, while the V(Ⅳ)/V(Ⅴ) couple is a quasi reversible process. The diffusion coefficients of the oxidation for V(Ⅳ)/V(Ⅴ) obtained from the scope of peak current Ip vs scan rate v1/2 is 4.4×10-5 cm2/s. The improvement of electrochemical activity for the electrode is mainly ascribed to the increase of the number of —COOH groups on the TPGF, which behaves as active sites catalyzing the vanadium species reactions and accelerating electron transfer reaction and oxygen transfer.     

Syntheses and cofluorescence of complexes of Eu（Ⅲ）/Y（Ⅲ） with terephthalic acid, 2-thenoyltrifluoroacetone and trioctylphosphine oxide

A series of Eu（ Ⅲ）/Y（Ⅲ） complexes of terephthalic acid（TPA） with 2-thenoyltrifluoroacetone（HTTA） and trioctylphosphine oxide（TPPO） were synthesized. Compositions of these complexes are revealed to be Eu2（1-x）Y2x（TPA）（TTA）4- （TPPO）4 or EU1-xYx（TPA）（TTA）（TPPO）2. Their 1R spectra, fluorescent spectra and the thermal and optical stability were studied. The fluorescent excitation spectra of these complexes show more broad excitation bands than those of Eu2（TPA）3（TPPO）4 and Eu（TTA）3（TPPO）2 corresponding to their formations. In addition, both the binuclear complex EuY（TPA）（TTA）4（TPPO）4 and the chain complex EU0.4Y0.6（TPA）（TTA）（TPPO）2 present higher thermal stability and better optical stability than the mononuclear complex Eu（TTA）3（TPPO）2 does. And their thermal and optical stabilities are preferably interpreted from the binuclear structure together with the chain polynuclear structure of the complexes. The fluorescence enhancement of cofluorescence Y^3＋ ions to the Eu（Ⅲ） complexes is clear. The optimum content of Y^3＋ is 0.6 （molar fraction） for the chain complexes Eu1-xYx（TPA）（TTA）- （TPPO）2 and 0.5 for the binuclear complexes Eu^2（1-x）Y2x（TPA）（TTA）4（TPPO）4. The formation of polynuclear structure of the complex Eu1-xYx（TPA）（TTA）（TPPO）2 appears to be responsible for the good cofluorescence effect of Y^3＋ ions.     

MSnO3(M=Ca,Sr,Ba)的溶胶-凝胶法合成及性能

采用溶胶-凝胶法制备了钙钛矿结构的MSnO3(M=Ca,Sr,Ba)晶体.将其作为锂离子电池负极材料的活性物质,利用恒电流电池测试仪研究其电化学性能.结果表明CaSnO3、SrSnO3和BaSnO3的首次放电容量分别为894.3 mAh/g、703.8 mAh/g和673.6 mAh/g,首次充电容量分别为418.3 mAh/g、257.8 mAh/g和224.8 mAh/g,不可逆容量损失分别达53.2%、63.3%和66.6%.     

手性配体交换乳状液膜选择性萃取扁桃酸对映体

基于手性配体交换反应,研究了在含有N-n-十二烷基-L-羟基脯氨酸和铜离子的配合物为手性配体的乳状液膜体系中选择性萃取扁桃酸对映体.考察了扁桃酸外消旋体浓度,手性萃取方向,有机溶剂和表面活性剂配比,从外水相到内水相pH值的梯度变化以及外水相的pH值变化对选择性萃取性能的影响,从而确定了合适的选择性萃取条件.     

空调机铝散热片表面无机亲水膜的研究

针对空调机铝散热片应用性能的要求，探讨了铝箔表面无机薄膜的设计和最佳工艺配方，测定了涂膜的亲水性，耐蚀性，抗溶性，耐热性，耐碱性认及抗弯曲性等性能，进行了扫描电镜表征，并据此对涂膜固化机理作了初步探讨，经该涂膜处理过的铝片其亲水性接触角由８０°改善至５°以下，其余所有性能指标都有大幅度提高，表明该项研究具有实用价值。     

环氧改性有机硅密封胶的研制

用Ｅ－４４环氧树脂与端羟基硅氧烷共混反应制备改性有机硅树脂，研究了共混比，共混反应时间等对改性树脂胶的影响。以改性树脂为基料制备了单组分室温固化有机硅密封胶，提出了制备配方和条件。     

萘普生分子印迹拆分过程热力学研究

采用4-乙烯基吡啶为功能单体,三甲氧基丙烷三甲基丙烯酸酯为交联剂,制备出(S)-萘普生的分子印迹聚合物,并将其用作高效液相色谱固定相,对其进行了评价.研究了流动相流速、不同功能单体和柱温对拆分效果的影响,测定出分离过程的热力学参数,证明萘普生分子印迹拆分过程是焓控过程.