JOURNAL OF THE ELECTROCHEMICAL SOCIETY,2014年161(1):A10-A13 ISSN：0013-4651
[Yi, Qingfeng; He, Donghua; Tang, Anping; Shen, Jie; Peng, Ronghua; Xu, Guorong] School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;[Yi, Qingfeng; Tang, Anping; Peng, Ronghua; Xu, Guorong] Key Laboratory of Theoretical Chemistry and Molecular Simulation of Ministry of Education, Hunan University of Science and Technology, Xiangtan 411201, China;[Hu, Yongjun] Department of Chemistry, Hunan City University, Yiyang 413000, China
A sensitive and selective amperometric immunosensor for chloramphenicol (CAP, IUPAC name: 2, 2-Dichloro-N-[2-hydroxy-1-(hydroxymethyl)-2-(4-nitrophenyl) ethyl] acetamide) detection based on magnetic nanocomposites modify screen-printed carbon electrode (SPCE) as a disposable platform was fabricated. Graphene sheets (GS)-Nafion (Nf) dispersed solution was first dropped on the SPCE and then Fe3O4-Au nanoparticles (GoldMag particles, GMP) coated bovine serum albumin-CAP (BSA-CAP) conjugates was absorbed on it with the aid of external magnetic field. X-ray powder diffractometer (XRD), electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) were employed to characterize the synthesized GS and the construction processes of the modified electrode. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used to study its electrochemical properties. The content of CAP was determined with a competitive immunoassay mode. When different concentration of CAP and 1.0 mu g/mL anti-CAP were added to the phosphate buffer solution (PBS) containing 2.0 mmol/L K-3[Fe(CN)(6)], the increase ratio of the DPV current (CI%) was proportional to the concentration of CAP over the range from 2.0 ng/mL to 200.0 ng/mL after incubation for 5.0 min at 25 degrees C. The detection limit was 0.82 ng/mL (S/N=3). The immunosensor was employed to determine CAP in milk samples and the results were consistent with high-performance liquid chromatography (HPLC) method. The proposed amperometric immunosensor is sensitive, selective, rapid, magnetic field controllable, low sample consumable and disposable. Results obtained in this study demonstrate that the immunosensor was suitable for determining trace CAP in real samples.
[Wang, Jiaoliang; Long, Liping; Hu, Yongjun] College of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan, People's Republic of China;[Wang, Jiaoliang] College of Chemistry and Environment Engineering, Hunan City University, Yiyang, Hunan, People's Republic of China;[Wang, Jiaoliang] State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, Hunan, People's Republic of China;[Xiao, Xiaoming] Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Hunan Normal University), Ministry of Education, Changsha, Hunan, People's Republic of China
[Wang, Jiaoliang] Univ South China, Coll Chem & Chem Engn, Hengyang, Hunan, Peoples R China.
Journal of Central South University of Technology,2007年14(1):47-50 ISSN：1005-9784
[Yuan, Yan; Hu, Yong-Jun; Chen, Bai-Zhen] School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;[Hu, Yong-Jun] Department of Chemistry, Hunan City University, Yiyang 413049, China
[Hu Yong-jun] Cent S Univ, Sch Met Sci & Engn, Changsha 410083, Peoples R China.
A polymer electrolyte based on poly(vinylidene) fluoride-hexafluoropropylene was prepared by evaporating the solvent of dimethyl formamide, and non-woven fabric was used to reinforce the mechanical strength of polymer electrolyte and maintain a good interfacial property between the polymer electrolyte and electrodes. Polymer lithium batteries were assembled by using LiCoO2 as cathode material and lithium foil as anode material. Scanning electron microscopy, alternating current impedance, linear sweep voltammetry and charge-discharge tests were used to study the properties of polymer membrane and polymer Li-ion batteries. The results show that the technics of preparing polymer electrolyte by directly evaporating solvent is simple. The polymer membrane has rich micro-porous structure on both sides and exhibits 280% uptake of electrolyte solution. The electrochemical stability window of this polymer electrolyte is about 5.5 V, and its ionic conductivity at room temperature reaches 0.151 S/m. The polymer lithium battery displays an initial discharge capacity of 138 mA·h/g and discharge plateau of about 3.9 V at 0.2 current rate. After 30 cycles, its loss of discharge capacity is only 2%. When the battery discharges at 0.5 current rate, the voltage plateau is still 3.7 V. The discharge capacities of 0.5 and 1.0 current rates are 96% and 93% of that of 0.1 current rate, respectively.
The current status of research on Aluminum抯 electro-chemical polishing was described, a long-life and effective non-polution technology was developed by using alkaline solution with some additives. The working temperature was 45-50 oC, polishing duration was 15-18 minutes.