H_2S对Q235钢在CO_2介质中的腐蚀影响及缓蚀研究

采用失重法研究了H2S对Q235钢在CO2介质中的腐蚀影响及咪唑啉缓蚀剂的缓蚀性能,并用电子探针分析了Q235钢表面的腐蚀产物膜,结果表明:常压CO2-H2S溶液中,H2S加速了CO2的腐蚀,在高压CO2-H2S溶液中,Q235钢腐蚀速率的对数lgRCO2-H2S与二氧化碳分压的对数lgPco2不成线性关系,实验室合成的咪唑啉化合物具有较好的缓蚀效果。     

不同因素对Q235钢在H_2S介质中腐蚀的影响研究

采用失重法和电化学方法研究了不同因素对Q235钢在H2S介质中腐蚀的影响,结果表明:H2S饱和的3%NaCl溶液中,Q235钢腐蚀速率随时间延长逐渐变小而后趋向平稳,随温度的升高出现先增大较快而后趋于平缓的变化规律;含3%NaCl的H2S溶液中,随着H2S浓度的增大,Q235钢的腐蚀速率出现先增大后减小的趋势。     

A non-labeled DNA biosensor based on light addressable potentiometric sensor modified with TiO2 thin film

Titanium dioxide (TiO_2) thin film was deposited on the surface of the light addressable potentiometric sensor (LAPS) to modify the sensor surface for the non-labeled detection of DNA molecules. To evaluate the effect of ultraviolet (UV) treatment on the silanization level of TiO_2 thin film by 3-aminopropyltrietboxysilane (APTS), fluorescein isothiocyanate (FITC) was used to label the amine group on the end of APTS immobilized onto the TiO_2 thin film. We found that, with UV irradiation, the silani-zation level of the irradiated area of the TiO_2 film was improved compared with the non-irradiated area under well-controlled conditions. This result indicates that TiO_2 can act as a coating material on the biosensor surface to improve the effect and effi-ciency of the covalent immobilization of biomolecules on the sensor surface. The artificially synthesized probe DNA molecules were covalently linked onto the surface of TiO_2 film. The hybridization of probe DNA and target DNA was monitored by the recording of Ⅰ-Ⅴ curves that shift along the voltage axis during the process of reaction. A significant LAPS signal can be detected at 10 μmol/L of target DNA sample.     

CuO/γ-Al2O3上H2催化还原氮氧化物的初步研究

采用γ—Al2O3和CuO／Y—Al2O3作为H2催化还原氮氧化物的催化剂，考察了反应温度、活性组分添加、原料配比以及原料气空速等对NO转化率的影响。结果表明：γ—Al2O3本身对于NO还原有一定的催化活性；Cu的添加可以使γ—Al2O3催化剂的NO还原活性明显提高；在考察的温度范围内，CuO／Y-AlO3催化剂活性随反应温度的升高明显增加，最高可达100％。随着反应原料气H2／NO(mol)的降低，NO转化率下降。     

沸石模型簇与乙烯、氮气和甲烷相互作用的从头算研究

设计不同的超分子计算模型簇Z…X（Z=2TNa（[H3SiOAlH3]-Na^＋），3TNa（[H3SiOAl（H）2OSiH3]^-Na^＋）和4TNa（[H3SiOAl（H）2OSi（H）2OSiH3]^-Na^=），X=C2H4、N2和CH4），模拟计算C2H4、N2和CH4与沸石模型簇的相互作用．在HF／6—31G水平上对Z、X和复合物Z…X进行几何全优化计算得到优化构型，经MP2／6—31G＊电子相关能校正和基组重叠误差（BSSE）校正以获得相互作用能．结果表明，对于一指定X，随Z尺寸增大，复合物Z…X的相互作用能减小；对于一指定Z，复合物Z…X的相互作用能由大到小顺序为Z…C2H4〉Z…N2》Z…CH。．分子间相互作用的能量分解分析显示，静电能在Z…X相互作用能量中占主导地位，电荷转移能在Z…C2H4复合物体系中居第2位，而极化能在Z…M和Z…CH4复合物体系中居第2位。     

电导法测定298K时NdCl3在DMF和H2O中的活度系数

应用电导法在298K时测定了稀土氯化盐NdCl3在混合溶剂(DMF-H2O)中的电导率;利用公式计算了NdCl3的摩尔电导率;应用Kohlraush经验规则,使用Origin软件进行线性拟合,外推得到298K时NdCl3在混合溶剂(DMF-H2O)中的无限稀释摩尔电导率λ0 =300.01 (S*cm2 *mol-1);应用Debye-Hücker 和Osager-Falkenhangen公式计算了NdCl3在混合溶剂(DMF-H2O)中的活度系数,并讨论了在298K时浓度对稀土盐NdCl3溶液活度系数的影响,随稀土氯化盐溶液浓度的增加,稀土盐溶液的活度系数降低.