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Application of potentiostats Using PC in the Phase Analysis of Galvano-Chemis-try

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International Journal of Minerals,Metallurgy and Materials 2000年第2期14卷 151-153页

作者： Bo Wen Xinyu Liu Xinhua Wang Wanjun Wang Xang Ma(Information Engineering School, University of Science and Technology Beijing, Beijing 100083, China)(Metallurgy School, University of Science and Technology Beijing, Beijing 100083, China)(Beijing Resea Information Engineering School University of Science and Technology Beijing Beijing 100083 China Metallurgy School University of Science and Technology Beijing Beijing 100083 China Beijing Research Institute of Iron and Steel Beijing 100081 China

A set of device is designed based on PC to realize the functions of traditional potentiostats in the phase ana1ysis of galvanochemistry. In the device, A/D and D/A conversion is used to measure the electrode potential and convert the voltage for outPut; specific program runs in the PC to regulate and control the system. The effect of the proportion factor Kp on the control variation is researched through certain experiment. Two experiments, the control of electrolysis in constant poteniial and the determination of polarization curves, are designed to test and evaluate the effectiveness of the device. The experimemel results show that the variation between the actualanode potential and the target potential could be controlled to below 1 mV if Kp is set to an appropriate value.

关键词： potentiostat PC phase analysis of galvano-chemistry

A high precision CMOS weak current readout circuit

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Journal of Semiconductors 2009年第7期30卷 131-136页

作者：吴其松杨海钢尹韬张翀 Institute of Electronics Chinese Academy of Sciences Graduate University of the Chinese Academy of Sciences

This paper presents a high precision CMOS weak current readout *** circuit is capable of converting a weak current into a frequency signal for amperometric measurements with high precision and further delivering a 10-bit digital output.A fast stabilization-enhanced potentiostat has been proposed in the design, which is used to maintain a constant bias potential for amperometric biochemical sensors.A technique based on source voltage shifting that reduces the leakage current of the MOS transistor to the reverse diode leakage level at room temperature was employed in the *** chip was fabricated in the 0.35 μm chartered CMOS process, with a single 3.3 V power *** interface circuit maintains a dynamic range of more than 100 *** from 1 pA to 300 nA can be detected with a maximum nonlinearity of 0.3% over the full scale.

关键词： amperometric sensor current readout high precision potentiostat

Modeling of Amperometric Immunosensor for CMOS Integration

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稀有金属材料与工程 2006年第A3期35卷 439-442页

作者： Ce Li Haigang Yang Shanhong Xia Chao Bian The State Key Lab of Transducer Technology Institute of Electronics CAS Beijing 100080 China Graduate University of Chinese Academy of Sciences Beijing 100039 China

A circuit model of the Amperometric immunosensor for use in the biosensor system-on-chip simulation is proposed in this *** model parameters are extracted with several methods and verified by MATLAB and SPICE simulation.A CMOS potentiostat circuit required for conditioning the Amperometric immunosensor is also included in the circuit *** mean square error norm of the simulated curve against the measured one is 8.65×10^(-17) The whole circuit has been fabricated in a 0.35μm CMOS process.

关键词： amperometric microelectrode circuit model potentiostat folded-cascode

Modeling of Amperometric Immunosensor for CMOS Integration

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稀有金属材料与工程 2006年第S3期 439-442页

作者： Ce Li~(1,2) Haigang Yang~1 Shanhong Xia~1 Chao Bian~(1,2) (1.The State Key Lab of Transducer Technology,Institute of Electronics,CAS,Beijing 100080,China) (2.Graduate University of Chinese Academy of Sciences,Beijing 100039,China)

A circuit model of the Amperometric immunosensor for use in the biosensor system-on-chip simulation is proposed in this *** model parameters are extracted with several methods and verified by MATLAB and SPICE simulation.A CMOS potentiostat circuit required for conditioning the Amperometric immunosensor is also included in the circuit *** mean square error norm of the simulated curve against the measured one is 8.65×10-17The whole circuit has been fabricated in a 0.35μm CMOS process.

关键词： amperometric microelectrode circuit model potentiostat folded-cascode

Corrosion of Snails (Gastropods) in Acidic Environment and Their Protection

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Journal of Surface Engineered Materials and Advanced Technology 2019年第1期9卷 1-10页

作者： Rajesh Kumar Singh Veena Kumari Deepmala Department of Chemistry Jagdam College Jai Prakash University Chhapra India Department of Zoology Deoghar College Deoghar India

Snails’ protection is essential because this species is to maintain a balanced ecology of water sources. They occur in rivers as well as ponds and balance the pH level of water. But these sources of water are contaminated by effluents, pollutants, acid rain, particulates, biological wastes etc. They can change the pH of water. Water is absorber of carbon dioxide and it converts carbon dioxide into carbonic. Other above mentioned wastes also increase the concentration of H+ ions in water. They produce hostile environment for snails. The outer part of snails is made of CaCO3. It produces chemical reaction in acidic medium and corrosion reaction is accelerated, and thus deterioration starts on the surface of snails. This medium makes their survival become miserable. For this work, corrosion of the snails’ study in the pH values of water is 6.5 in H2CO3 environment. The corrosion rates of snails were calculated by gravimetric methods and potentiostat technique. Aloe Vera was used for corrosion protection in acidic medium. The surface adsorption phenomenon was studied by Langmuir isotherm. Aloe Vera formed thin surface film on the interface of snails which adhered with chemical bonding. It was confirmed by activation energy, heat of adsorption, free energy, enthalpy and entropy. The results of surface coverage area and inhibitors efficiency indicated that Aloe Vera developed a strong protective barrier in the acidic medium.

关键词： Corrosion Snails Aloe Vera Carbonic Acid potentiostat Thin Film Formation

Effect of Radial Expansion of Cr-Mo Steel Tubes on Their Corrosion Behavior in Sea Water

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Materials Sciences and Applications 2012年第9期3卷 587-595页

作者： A. C. Seibi P. Rostron A. Elramady B. Mishra O. Al Nazer S. Al Ameri Chemistry Department Petroleum Institute Abu Dhabi UAE Mechanical Engineering Department Petroleum Institute Abu Dhabi UAE Metallurgical & Materials Engineering Department Colorado School of Mines Golden USA

This paper studies the effect of expansion ratio on the corrosion rate of the expanded tubes exposed to sea water as well as the microstructure changes caused by the expansion of Cr-Mo steel tubes to large permanent deformations. 2.25 Cr-1.0 Mo steel (schedule 40 and schedule 80) tubes were subjected to various expansion ratios of 10%, 15%, 20%, and 25% by pushing conical mandrels through them using a piston. The microstructure was also studied to determine the effect of the expansion on the grain structure of the material. Microscopic examination of the expanded tubes revealed that grains elongate along the direction of the hoop stress and this elongation increases with an increase of expansion ratio. Moreover, it was found that corrosion rate and hardness increase with an increase in expansion ratio.

关键词： Expanded Tubes Corrosion in Seawater potentiostat Hardness Enlarged Grain Size

Corrosion Behaviour of Al6061-Frit Particulate Metal Matrix Composites in Sodium Chloride Solution

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Journal of Minerals and Materials Characterization and Engineering 2013年第1期1卷 15-19页

作者： Dasappa Ramesh Ragera Parameshwarappa Swamy Tumkur Krishnamurthy Chandrashekar Department of Mechanical Engineering Sri Siddhartha Institute of Technology Kamataka India Department of Studies in Mechanical Engineering University B.D.T. College of Engineering Kamataka India Sri Siddhartha Institute of Technology Kamataka India

In this investigation, an attempt has been made to develop Al6061-Frit particulate metal matrix composites through stir casting technique using metal molds and to study the corrosion behaviour. Pre heated frit particles were added to matrix as reinforcement. Al6061 containing 2 wt% to 8 wt % in steps of 2 wt % of frit particulate composites were prepared. Corrosion tests were conducted by using potentiostat model SEP238C where 3.5% NaCl solution was used as corrodent. The corrosion rate of metal matrix composites was lower than that of matrix material Al6061 under the corrosive atmosphere for both un-heat treated and heat treated conditions.

关键词： Al6061 Alloy Frit Stir Casting potentiostat Corrosion Rate (mmpy)