电机护环钢在硝酸盐溶液中应力腐蚀开裂的控制过程研究

本文在文献［１］基础上，运用金相，电化学方法研究了５０Ｍｎ１８Ｃｒ４电机护环钢依照ＱＨＪ－７９试验标准在硝酸盐介质中应力腐蚀开裂（即ＳＣＣ）的性质，结果指出，此体系中ＳＣＣ的控制过程为阳极溶解。     

基于酶催化沉积放大的检测芜菁花叶病毒的生物传感技术

提出了一种基于酶催化沉积放大检测芜菁花叶病毒(Turnip mosaic virus, TuMV)的生物传感技术。该方法先通过夹心免疫反应,将碱性磷酸酯酶标记的芜菁花叶病毒抗体固定到电极表面,然后通过碱性磷酸酯酶催化还原银离子在电极表面形成不溶性沉积物,从而放大电化学检测信号。考察了抗体的用量和沉积时间对免疫分析的影响,结果显示传感器信号响应与芜菁花叶病毒原液的浓度在10~1 000倍稀释范围内呈良好的线性关系,检出限达到500 000倍芜菁花叶病毒原液稀释浓度。     

场发射FED器件MIM结构Ta-Ta2O5-Al薄膜的制备及性能

利用直流磁控溅射Ta膜和阳极氧化法制备Ta2O5薄膜,能谱分析（EDS）和X射线衍射仪（XRD）研究表明,在H3PO4电解液中添加少量的乙二醇制备的Ta2O5薄膜,呈非晶态,没有β-Ta2O5晶相出现.利用电击穿场强测试系统研究Ta-Ta2O5-Al复合薄膜制备FED器件（MIM结构）的绝缘性,证明采用磁控溅射和阳极氧化法成功制备了漏电流密度低、耐击穿场强高的Ta2O5薄膜.     

用电化学研究表面膜抑制黄铁矿氧化效果

运用伏安法研究了表面包膜后的黄铁矿电极的电化学行为。黄铁矿电极在０．２０ｍｏｌ／Ｌ Ｎａ２ＳＯ４溶液（ｐＨ４．５）中,扫描电势在０．１５￣０．５５Ｖ（相对于标准氢电极）内,无明显的阳极氧化电流出现;而当电势大于０．６０Ｖ时,电流呈指数式的急剧增加,作为阳极的黄铁矿电极发生强烈的氧化反应。黄铁矿电极表面经ｐＨ３,５和７的０．１０ｍｏｌ／ＬＨ２Ｏ２与０．０５％配合剂混合液成膜处理２和６ｈ后,塌流一电势     

Indication of Soil Microbial Activity by Electrical Signals of Microbial Fuel Cells with Re-Vegetated Red Soils

Electrical signals generated by microbial fuel cells (MFCs) may potentially indicate overall soil microbial activity. This study aimed to validate whether a significant correlation existed between soil microbial activity and electrical signals in different soils. Re-vegetated red soils with four vegetation types and unplanted eroded red soil were collected and packed into MFCs. The voltage of the MFCs was recorded during operation. Electrical signals including start-up time (ST), peak voltage, and coulomb quantity were extracted from the voltage curves. Soil dehydrogenase activity (DHA) was determined as a reference method to verify the reliability of the electrical signals. After MFC operation, the anodic bacterial community was analyzed by Illumina sequencing based on the 16S rRNA gene. The results indicated that ST was significantly correlated with DHA, along with soil organic carbon content. The linear regression model described the optimal relationships for ST and DHA. Clostridium and Acinetobacter constituted the dominant genera on the anode of the MFCs. The results demonstrated that ST may indicate soil microbial activity in re-vegetated red soils.     

Impact of Aluminum on Phosphate Uptake and Acid Phosphatase Activity in Root Tips of Lotus Japonicus

The effect of aluminum (Al) on phosphate homeostasis and induction of acid phosphatase activity and isoenzymes was analyzed in root tips of Lotus japonicus. The rapid uptake of phosphate as well as the decrease of soluble inorganic phosphate in tissues suggested, that the presence of Al in root apoplast causes precipitation of the most of absorbed phosphate. Acid phosphatase (ACP) isoenzymes are affected differentially during low pH and Al stress and both Al induced increases and decreases of ACP isoenzyme activities were observed.     

碳纳米颗粒修饰丝网印刷电极测定百合镉含量

该文利用烛灰,设计开发一种基于碳纳米颗粒修饰的丝网印刷电极,并对该电极的性能进行了评估。扫描电子显微镜显示修饰后的工作电极表面碳纳米颗粒分布均匀,直径约几十纳米。电极表征时,修饰电极氧化峰高13.76 m A,还原峰高11.85 m A,峰电位差为267 m V。在使用方波阳极溶出法检测含75μg/L Cd2+缓冲液时,修饰电极峰高为3.123μA。使用修饰电极检测不同Cd2+浓度缓冲液时,将峰高与Cd2+浓度进行数量关系拟合,获得拟合方程,R2=0.998。该修饰电极Cd2+浓度检测限可达到0.91μg/L。将其用于百合样本检测,加标回收率为99.2%~100.8%。该文修饰碳纳米颗粒丝网印刷电极可为其他检测对象或其他检测环境下的检测提供参考。     

阳极溶出伏安法测定钴的研究

在浓度为8×10-4mol/L、pH值为8.6的NH3-NH4Cl底液中,用碳糊电极测定痕量的钴,并对电极反应机理进行了探讨.阳极峰电位为0.2V,峰电流与钴离子浓度在8×10-9～4×10-7mol/L范围内呈良好的线性关系,检测下限2×10-9mol/L;对样品中微量钴进行测定,回收率为96%～98%.     

丝网印刷碳电极传感器检测茶叶中痕量铅研究

建立了同位镀汞法修饰的丝网印刷碳电极电化学方波溶出伏安法快速检测茶叶中的铅的方法。详细描述了建立该系统检测方法的条件优化过程,得到了一系列最佳参数:最佳的镀汞液浓度4×10-4mol/L,沉积电位-1.1V,电位增量3mV,方波频率10Hz,方波幅度0.05V,pH值5,沉积时间280s,平衡时间30s。在优选条件下获得的方法灵敏度、线性范围和检测限分别为22.7nA/(μg/L),10~225μg/L(r=0.9986)和0.74μg/L(S/N=3)。研究了对多种重金属元素存在条件下120μg/L的铅检测的干扰情况。本试验对样品前处理方法研究发现,采用家用微波炉、聚四氟乙烯密封增压微波消化罐消化茶叶,用标准加入法对分析样品进行检测,与国标方法相比较,无显著偏差。该方法灵敏、准确、快速适合于茶叶中痕量铅的测定。     

恒电流法在AAO模板中制备钯合金纳米线

在孔深60μm直径200 nm的通孔氧化铝模板中,采用恒电流沉积法制备了钯镍与钯银合金纳米线阵列.用扫描电子显微镜和X-射线能谱仪表征纳米线的形貌和成分.研究结果表明:Pd-Ni合金纳米线中镍的含量随着电流密度的增大而增加,电流密度在0.6~1.0 mA.cm-2之间时,合金纳米线中镍的质量分数变化范围为7.89%~15.21%;Pd-Ag合金纳米线中银的质量分数随着电流密度的增大而减少,电流密度在2.0~3.0 mA.cm-2之间时,合金中银的质量分数变化范围为22.88%~16.55%.获得的钯合金纳米线线条均匀连续、结晶致密,长径比高达250.