利用导电涂膜直接电解海水法防护生物腐蚀 1.模拟和测量技术

基于电化 学微探针 和微弱 信号检测 技术， 采用 四电 极体 系、双恒 电 位仪、锁相 相 关测定系统 以及三维 微调装 置建立模 拟和测量 系统，将 首次实 现对利 用导 电涂 膜直 接电 解海 水法 防护生物腐 蚀中微 米尺度内 痕量 Ｃｌ Ｏ － 浓度 的测量．本 文报道 了模拟和 测量实验 的阶段 性进展

铅胁迫对双孢蘑菇积累铅及抗氧化酶活性的影响

铅（Pb）是环境中最普遍的重金属污染物之一，不仅直接毒害土壤生物，破坏生态结构，还可以通过食物链迁移转化，危害人体健康，因此Pb污染的治理迫在眉睫。大型真菌具有强的金属富集能力及较高的相对年生物量，因此在对Pb污染的修复中有一定优势。本文以双孢蘑菇菌丝为研究对象，采用马铃薯葡萄糖琼脂培养的方法，研究不同浓度Pb胁迫对双孢蘑菇菌丝体的生长状况、形态以及机体内抗氧化酶系统的影响。结果表明，在实验浓度下Pb对双孢蘑菇菌丝体的生长率无显著性影响，且菌丝体中Pb含量随着培养基中Pb浓度的增加而升高，达到10.40 μg/g。扫描电镜和透射电镜结果显示，Pb胁迫下菌丝体的细胞结构受到一定破坏，细胞膜透性增加。X射线能谱分析观察得到细胞中的黑色颗粒为铅，表明Pb在细胞内的富集。菌丝体中丙二醛含量随Pb浓度的增加而增加，超氧化物歧化酶（SOD）、过氧化物酶（POD）、过氧化氢酶（CAT）和抗坏血酸过氧化物酶（APX）等抗氧化酶活性随着Pb浓度的增加有不同程度的反应。在酶活力达到最大时，相比对照组分别增加了56.45%、61.36%、13.08%和10.59%，说明双孢蘑菇通过调节自身抗氧化酶系统适应Pb胁迫环境，据此在Pb污染的生物修复中具有应用潜力。福建省教育厅中青年教师教育科研项目（JAT170364）;;\n国家自然科学基金项目（31530008和318704832）资

CO_2-laser micromachining for production of PMMA-based microarrayer

提出利用CO2激光器快速制作微阵列点样芯片。通过测量激光在不同功率下加工小孔或是对同一小孔加工不同次数时所得小孔孔径和深度,以此来确定激光器的各项性能参数。并且测得不同功率的激光穿透小孔以及穿透次数不同所得小孔孔径。最后利用直径约为79μm的10×10阵列式孔道制作微阵列点样芯片,于尼龙膜上点样,所得样点平均直径为200μm,并测得小孔孔径与样点两者相对标准偏差分别为4.3%和7.4%。A new method to produce microarrayer rapidly by CO_2-laser system was presented. The system parameter was assessed of the depth and diameter of laser-ablated hole on the laser beam power and on the number of marks of the beam in the same hole. And the diameters of penetrated holes on the laser beam power and on the number of marks of the beam in the same hole were measured. The microarrayer was produced by the 10×10 array of holes. The diameters of holes were about 79μm. The diameters of spots which were printed on nylon membrane were about 200μm. And the CV of holes and the spots were 4.3% and 7.4%国家自然科学基金(No.20475047)资助项

Novel System of Direct Methanol Fuel Cell Anode Catalysts: NanoTiO_2-CNT-PtNi Complex Catalysts

采用电合成前驱体Ti(OEt)_4直接水解法和电化学扫描电沉积法制备纳米TiO_2-CNT-PtNi复合纳米催化剂.透射电镜(TEM)和X射线衍射(XRD)测试结果表明,纳米PtNi合金粒子(平均粒径8nm)均匀地分散在纳米TiO2-CNT复合膜的三维网络结构中.通过暂态电化学方法研究表明,复合纳米催化剂的电化学活性比表面积为90m~2/g,对甲醇氧化具有很高的电催化活性和稳定性,常温常压下甲醇氧化峰电位为0.67和0.44V,当温度为60℃时,氧化峰电位负移至0.64和0.30V,氧化峰电流密度高达1.38A/cm~2.复合纳米催化剂对甲醇电氧化的高催化活性和稳定性可归因于多元复合纳米组分的协同催化作用,这种作用导致CO在复合纳米催化剂上的弱吸附,从而避免了催化剂的中毒.The nanoTiO2-CNT-PtNi complex catalysts were prepared by the direct hydrolysis of electro-synthetic precursor Ti(OEt)4 and electrochemical scan electrodepositing method. The results of XRD and SEM show that the PtNi nanoparticle of average size 8 nm was dispersed uniformly on nanoTiO2-CNT com-plex film surface. The electrocatalytic activity of the nanoTiO2-CNT-PtNi complex catalysts was investi-gated by cyclic voltammetry and chronopotentiogram. The results indicated that the nanoTiO2-CNT-PtNi complex catalysts with Pt loading of 0.32 mg/cm2 exhibited high electrochemically active surface area of 90 m2/g and very high electrocatalytic activity and stability for electro-oxidation of methanol. The oxidation peak potential of methanol was 0.67 and 0.44 V at room temperature in atmosphere pressure, respectively, and shifted to 0.64 and 0.30 V at 60 ℃ and the oxidation peak current of methanol was 1.38 A/cm2. The high electrocatalytic activity and good stability can be attributed to the synergistic catalytic effect of nano-composite, which leads to the weak adsorption of CO on complex nanostructure catalysts, avoiding poison-ing of the catalysts.国家自然科学基金(No.20476001);; 安徽省自然科学基金(No.00045317)资助项目

Novel system of direct methanol fuel cell anode catalysts: NanoTiO(2)-CNT-PtNi complex catalysts

The nanoTiO(2)-CNT-PtNi complex catalysts were prepared by the direct hydrolysis of electrosynthetic precursor Ti(OEt)(4) and electrochemical scan electrodepositing method. The results of XRD and SEM show that the PtNi nanoparticle of average size 8 nm was dispersed uniformly on nanoTiO(2)-CNT complex film surface. The electrocatalytic activity of the nanoTiO(2)-CNT-PtNi complex catalysts was investigated by cyclic voltammetry and chronopotentiogram. The results indicated that the nanoTiO(2)-CNT-PtNi complex catalysts with Pt loading of 0.32 mg/cm(2) exhibited high electrochemically active surface area of 90 m(2)/g and very high electrocatalytic activity and stability for electro-oxidation of methanol. The oxidation peak potential of methanol was 0.67 and 0.44 V at room temperature in atmosphere pressure, respectively, and shifted to 0.64 and 0.30 V at 60 degrees C and the oxidation peak current of methanol was 1.38 A/cm(2). The high electrocatalytic activity and good stability can be attributed to the synergistic catalytic effect of nanocomposite, which leads to the weak adsorption of CO on complex nanostructure catalysts, avoiding poisoning of the catalysts

New Technique and Instrument of Isotachophoresis

本文提出一种新型的微机化、开放式毛细管等速电泳仪,同常规毛细管等速电泳仪比较,本仪器结构简单,价格便宜。实验条件、结果和曲线可打印或存盘。曲线可由Xy记录仪记录。阳离子或阴离子的分析已获得满意的结果,临床应用已获得初步结果。A new microcomputer-based, open capillary isotachophoresis instruments has been developed.Compared with conventional capillary isotachophoresis analyzer, it is simpler in structure and cheaper.All of experimental conditions, results and curves may be printed out or stored.The curve may be sent to X-Y recorder.SatisFactory results of cations or anions have been obtained.Initial results of application in clinic have been obtained

Improvement of A High PerFormance Amperometric Detector For Flow Through System

采用在工作电极（WE）及辅助电极（CE）室衬垫尼龙网布的方法改进了本教研室提出的WE与CE正对面放置型的电流检测［1］。在进样100μl样品（br-），流速2Ml/MIn，检测器电解效率达18.9%，浓度电流线性范围为10-2~10-8MOl/l，重复进样相对标准偏差小于1%。Using a method of padding the working electrode(WE) chamber and complementary electrode (CE) chamber with nylon nets, we improved the Face-to-Face WE/CE type amperometric detector previously developed in our teaching and research section.An injection of a 100 μL Br- sample at a Flow rate of 2 mL/min brings about an electrolytic eFFiciency of 18.9%, a RSD of less than 1 % and a linearity of 10-2-- 10-8 mol/L

XYZ_2 High_Performance Electrochemical Suppressorfor Ion Chromatography

本文研究离子色谱电化学抑制器的填料问题，提出以直径大小一致、中等磺化深度的球状树脂为最佳方案．改进后的抑制效率达９９．９８％，灵敏度提高了约１０％，离子的峰高及保留时间的重现性均优良（ｃ．ｖ．＜２）．The packings of electrochemical suppressor on ion chromatography were studied,It was found that the best packing is the appropriately sulfonate globular resins uniform in size.Using these resins,suppression efficiency was improved to 99.98%,and sensitivity improves about 10%,the reproducibilities of both the height of ion peaks and retention time are very good(c.v作者联系地址：厦门大学固体表面物理化学国家重点实验室厦门大学物理化学研究所厦门大学化学系Author's Address: Dept. of Chem.Xiaman Univ., Xiaman 36100

Direct Electrolysis of Seawater on Conducting Film for Microbial Anticorrosion 1. Simulation and Measurement Technique

基于电化 学微探针 和微弱 信号检测 技术， 采用 四电 极体 系、双恒 电 位仪、锁相 相 关测定系统 以及三维 微调装 置建立模 拟和测量 系统，将 首次实 现对利 用导 电涂 膜直 接电 解海 水法 防护生物腐 蚀中微 米尺度内 痕量 Cl O - 浓度 的测量.本 文报道 了模拟和 测量实验 的阶段 性进展.Based on the electrochemical micro probe and the weak signal detection technique, simulated test and measurement system were set up by the use of four_electrode cell(including a micro electrode), bipotentiostat, lock_in amplifier and three_dimensional micro manipulating device.Based on the system, the micrometer scale concentration distribution of trace hypochlorite, which is produced by direct electrolysis of seawater on the conducting film for preventing microbial corrosion has been obtained for the first time.Both relationships between concentration of hypochlorite and its reduction current, which is termed an working curve, and between the reduction current of hypochlorite and measured time are reported.船舶工业总公司七二五所厦门分部的资

Direct Electrolysis of Seawater on Conducting Film for Microbial Anticorrosion 1. Simulation and Measurement Technique

基于电化 学微探针 和微弱 信号检测 技术， 采用 四电 极体 系、双恒 电 位仪、锁相 相 关测定系统 以及三维 微调装 置建立模 拟和测量 系统，将 首次实 现对利 用导 电涂 膜直 接电 解海 水法 防护生物腐 蚀中微 米尺度内 痕量 Ｃｌ Ｏ － 浓度 的测量．本 文报道 了模拟和 测量实验 的阶段 性进展．Based on the electrochemical micro probe and the weak signal detection technique, simulated test and measurement system were set up by the use of four_electrode cell(including a micro electrode), bipotentiostat, lock_in amplifier and three_dimensional micro manipulating device. Based on the system, the micrometer scale concentration distribution of trace hypochlorite, which is produced by direct electrolysis of seawater on the conducting film for preventing microbial corrosion has been obtained for the first time. Both relationships between concentration of hypochlorite and its reduction current, which is termed an working curve, and between the reduction current of hypochlorite and measured time are reported.作者联系地址：固体表面物理化学国家重点实验室!厦门大学化学系物理化学所厦门361005,固体表面物理化学国家重点实验室!厦门大学化学系物理化学所厦门361005,固体表面物理化学国家重点实验室!厦门大学化学系物理化学所厦门361005,固体表面物理化学国家重点实验室!厦门大学化学系物理化学所厦Author's Address: State Key Lab. for Phys. Chem. of the Solid Surf., Dept. of Chem., Ins. of Phys. Chem., Xiamen Univ., Xiamen 36100