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2011

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Articles 541 - 570 of 1068

Full-Text Articles in Chemistry

Synthesis Of Pyridine-Based Ligands As Potential Magnetic Liquid Crystals, Jacqueline Gamboa Varela^, Jose E. Nunez* Mar 2011

Synthesis Of Pyridine-Based Ligands As Potential Magnetic Liquid Crystals, Jacqueline Gamboa Varela^, Jose E. Nunez*

COURI Symposium Abstracts, Spring 2011

Ligands for the development of metallomesogens (metal-containing-liquid-crystals) have attracted attention due to potential applications in materials science such as optical devices, magnetic switches, and conductors. The attempts to synthesize bis(3-alkoxy) pyridine amines are presented. These structures are designed to exhibit liquid crystalline properties as metal complexes. Reaction conditions using potassium carbonate and potassium tert-butoxide as bases under Ullmann-type conditions in various solvents (aromatic and non-aromatic), between -78 ⁰C to 160 ⁰C, have been unsuccessful. It is imperative to understand the electronic effects of the meta-substituted pyridine precursors to further develop the copper-catalyzed conditions of these types of molecules.

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Bis( N, N-Dipheny-3-Pyridineamine) Tungsten Complex As Molecular Gyroscope, Verenice Ramirez^, Jose E. Nunez* Mar 2011

Bis( N, N-Dipheny-3-Pyridineamine) Tungsten Complex As Molecular Gyroscope, Verenice Ramirez^, Jose E. Nunez*

COURI Symposium Abstracts, Spring 2011

In recent years, the interest in molecular machines has increased based on inspiration from macroscopic machines, such as gyroscopes applied in racecar engines and arrays of gyroscopes in automatic pilot functions. The same concept has been taken down to the nanoscopic level as molecular machines in solution like bevel gears and turnstiles, but for application use they must be in the solid state. Gyroscope molecules can exhibit fast rotation and the aim is to design free rotation in the crystal lattice that maintains volume conserving motion. Bis(N,N-diphenyl-3-pyridinamine) tungsten complex was prepared by irradiation of tungsten hexacarbonyl in the presence of …

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Method Development For The Analysis Of Ddt, Ddd, And Dde In Cow Milk, Amanda Parra^, Betty Rocha, Wen-Yee Lee* Mar 2011

Method Development For The Analysis Of Ddt, Ddd, And Dde In Cow Milk, Amanda Parra^, Betty Rocha, Wen-Yee Lee*

COURI Symposium Abstracts, Spring 2011

Organochlorine Pesticides (OCs) are classified as persistent organic pollutants (POPs). They have been found to bioaccumulate in organisms over time. These chemicals tend to attach to fatty tissues in animals and humans, remaining for long periods of time. OCs may be responsible for a vast number of health conditions including neurological disorders, endocrine disruption, reproductive dysfunctions, and possible linkage to cancer.  OCs such as DDT, DDE and DDD are banned, however, they have still been detected in environmental samples worldwide. The main objective of this study is to investigate the presence of DDT, DDE and DDD in cow milk using …

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Metal Carbonyl Catalysts For The Transformation Of Silicon Hydrides To Siloxanes In The Presence Of Dmf, Eduardo Cervantes^, Renzo Arias Ugarte, Hemant K. Sharma, Keith H. Pannell* Mar 2011

Metal Carbonyl Catalysts For The Transformation Of Silicon Hydrides To Siloxanes In The Presence Of Dmf, Eduardo Cervantes^, Renzo Arias Ugarte, Hemant K. Sharma, Keith H. Pannell*

COURI Symposium Abstracts, Spring 2011

It has recently been reported that, upon photochemical irradiation, tertiary silanes (R3SiH) react with DMF to form disiloxanes (R3Si-O-SiR3) and Me3N, using the transition metal alkyl complex (η5-C5H5)Fe(CO)2Me as a catalyst. Intermediates of the type R3SiOCH2NMe2 were proposed as the important first step via a hydrosilylation reaction but no evidence was obtained for this suggestion. By changing the catalyst to Mo(CO)6 we have now observed that not only do we form the expected  disiloxanes, but for the first …

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Human Endogenous Sodium Pump Inhibitors Measurement, Source, Synthesis And Regulation, Jie Ma Mar 2011

Human Endogenous Sodium Pump Inhibitors Measurement, Source, Synthesis And Regulation, Jie Ma

Theses and Dissertations

The sodium pump (SP or Na+,K+-ATPase) is a membrane embedded protein complex that pumps 3 sodium ions out and 2 potassium ions into the cell per cycle and in so doing creates a cell membrane electrochemical potential. The membrane potential is critical for any functional cell. In the vasculature, reduction in the voltage potential causes vascular smooth muscle contraction and a narrowing of blood vessels (vasoconstriction) which can lead to increased blood pressure (hypertension). Substantial research over the past several decades has provided a vast amount of research on SP inhibitors, sometimes called endogenous digitalis-like factors (EDLF). Increased levels of …

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Super Collision Energy Transfer Studies In Single Collisions Between Vibrationally Hot Benzene Like Molecules And Ground State Bath Molecules: The Effect Of Physical Properties Of Donor And Bath Molecules On Super Collision Energy Transfer, Kilyoung Kim Mar 2011

Super Collision Energy Transfer Studies In Single Collisions Between Vibrationally Hot Benzene Like Molecules And Ground State Bath Molecules: The Effect Of Physical Properties Of Donor And Bath Molecules On Super Collision Energy Transfer, Kilyoung Kim

Theses and Dissertations

This research is focused on single-collision energy transfer events between highly vibrationally excited benzene-like donor molecules and small bath molecules, CO2 and N2O in the vibrational ground level. Measuring how much energy is transferred from donors to bath molecules was accomplished by probing bath molecules scattered into specific-rotational states using a tunable Δv=0.0003 cm-1 solid state diode laser. The normalized energy transfer probability distribution function, P(E,E'), determined from energy gain information, is very useful in comparing collisional energy transfer efficiency between various collision systems. P(E,E') is also used to investigate the effects of donor and bath physical properties on collisional …

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Reduced Activity Of Multiple Endocrine Disrupting Compounds: 17Β-Estradiol And Bisphenol A With A Chemi-Luminescent Assay, Anna C. Ortiz^, Roberto J. De La Torre-Roche, Marc B. Cox, Wen-Yee Lee* Mar 2011

Reduced Activity Of Multiple Endocrine Disrupting Compounds: 17Β-Estradiol And Bisphenol A With A Chemi-Luminescent Assay, Anna C. Ortiz^, Roberto J. De La Torre-Roche, Marc B. Cox, Wen-Yee Lee*

COURI Symposium Abstracts, Spring 2011

The concern about the impacts of endocrine disrupting compounds (EDCs) in the environment has increased recently with their high occurrence in surface waters and sex changes in various aquatic organisms. EDCs include ubiquitously used pharmaceuticals and personal care products, such as soap, detergents, contraceptives, and other medicines, which are released constantly into the environment, in waste water treatment plant effluent. Though toxicological effects of these individual, EDCs have been studied, knowledge on how these chemicals interact together in the environment is very limited. The objective of this project is to study the multi-residue effect of EDCs using a chemi-luminescent yeast …

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A Novel Use Of Digoxin Immune Fab Fragment In Identification And Isolation Of An Endogenous Digitalis-Like Factor Found In Preeclampsia, Moana Lee Hopoate-Sitake Mar 2011

A Novel Use Of Digoxin Immune Fab Fragment In Identification And Isolation Of An Endogenous Digitalis-Like Factor Found In Preeclampsia, Moana Lee Hopoate-Sitake

Theses and Dissertations

The mechanisms mediating the hypertension of preeclampsia (PE) are unclear. Endogenous digitalis-like factors (EDLFs) are specific sodium pump (SP) inhibitors implicated in essential and experimental hypertension, but they have not been fully explored in the setting of PE. This study uses a digoxin antibody Fab fragment to address the question of whether such factors are present and increased in PE, to investigate a possible treatment of PE, and to isolate and characterize all EDLFs present in PE. Sera and placenta from women with PE did show a significant increase in SP inhibition in comparison to women with normal pregnancy and …

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Surface Modification, Fabrication, And Characterization Of Silicon, Polymer, And Nanotube Composite Materials, Lei Pei Mar 2011

Surface Modification, Fabrication, And Characterization Of Silicon, Polymer, And Nanotube Composite Materials, Lei Pei

Theses and Dissertations

In my research, I have performed many characterization and fabrication experiments that are based on tools of analytical chemistry, materials chemistry, and surface science. My research projects are as follows. (1) Fabrication of transparent polymer templates for nanostructured amorphous silicon photovoltaics was done using low-cost nanoimprint lithography of polydimethylsiloxane. This approach provides a test bed for absorption studies in nanostructured film geometries and should result in improved light capturing designs in thin-film solar cells. Nanopatterned polymer films were characterized by scanning electron microscopy and optical measurements. (2) A straightforward method for fabricating freely suspended, thin, carbon nanotube (CNT) membranes infiltrated …

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Transformation Of Fusarium Verticillioides With A Polyketide Gene Cluster Isolated From A Fungal Endophyte Activates The Biosynthesis Of Fusaric Acid, Yunxuan Xie, Wei Zhang, Yaoyao Li, Mingzi Wang, Ronald Cerny, Yue Shen, Liangcheng Du Mar 2011

Transformation Of Fusarium Verticillioides With A Polyketide Gene Cluster Isolated From A Fungal Endophyte Activates The Biosynthesis Of Fusaric Acid, Yunxuan Xie, Wei Zhang, Yaoyao Li, Mingzi Wang, Ronald Cerny, Yue Shen, Liangcheng Du

Liangcheng Du Publications

A large number of bioactive natural products have been isolated from plant endophytic fungi. However, molecular mechanisms for the biosynthesis of these metabolites have lagged behind because genetic and biochemical studies are difficult to perform within many of the endophytes. In this work, we describe our attempt to express a putative mycoepoxydiene (MED) biosynthetic gene cluster in Fusarium verticillioides, which has a well-developed genetic system for the study fungal polyketide biosynthesis. MED was isolated from Phomopsis sp. A123, a fungal endophyte of the mangrove plant, Kandelia candel. It has several unusual structural features and interesting biological activities. Integration of …

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Quantifying The Energetic Contributions Of Desolvation And Π-Electron Density During Translesion Dna Synthesis, Edward A. Motea, Irene Lee, Anthony J. Berdis Mar 2011

Quantifying The Energetic Contributions Of Desolvation And Π-Electron Density During Translesion Dna Synthesis, Edward A. Motea, Irene Lee, Anthony J. Berdis

Chemistry Faculty Publications

This report examines the molecular mechanism by which high-fidelity DNA polymerases select nucleotides during the replication of an abasic site, a non-instructional DNA lesion. This was accomplished by synthesizing several unique 5-substituted indolyl 2′-deoxyribose triphosphates and defining their kinetic parameters for incorporation opposite an abasic site to interrogate the contributions of π-electron density and solvation energies. In general, the Kd, app values for hydrophobic non-natural nucleotides are ∼10-fold lower than those measured for isosteric hydrophilic analogs. In addition, kpol values for nucleotides that contain less π-electron densities are slower than isosteric analogs possessing higher degrees of π-electron density. The differences …

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Synthesis And Isolation Of {110}-Faceted Gold Bipyramids And Rhombic Dodecahedra, Michelle L. Personick, Mark R. Langille, Jian Zhang, Nadine Harris, George C. Schatz, Chad A. Mirkin Mar 2011

Synthesis And Isolation Of {110}-Faceted Gold Bipyramids And Rhombic Dodecahedra, Michelle L. Personick, Mark R. Langille, Jian Zhang, Nadine Harris, George C. Schatz, Chad A. Mirkin

Department of Chemistry: Faculty Publications

Two {110}-faceted gold nanostructures—rhombic dodecahedra and obtuse triangular bipyramids—have been synthesized via a Ag-assisted, seed-mediated growth method. The combination of a Cl−-containing surfactant with a low concentration of Ag+ plays a role in the stabilization of the {110} facets. To the best of our knowledge, this is the first reported synthesis of a {110}-faceted bipyramid structure.

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Polymorphs And Hydrates Of Acyclovir, Katie M. Lutker, Rosalynn Quiñones-Fernández, Jiadi Xu, Ayyalusamy Ramamoorthy, Adam J. Matzger Mar 2011

Polymorphs And Hydrates Of Acyclovir, Katie M. Lutker, Rosalynn Quiñones-Fernández, Jiadi Xu, Ayyalusamy Ramamoorthy, Adam J. Matzger

Chemistry Faculty Research

Acyclovir (ACV) has been commonly used as an antiviral for decades. Although the crystal structure of the commercial form, a 3:2 ACV/water solvate, has been known since 1980s, investigation into the structure of anhydrous ACV has been limited. Here, we report the characterization of four anhydrous forms of ACV and a new hydrate in addition to the known hydrate. Two of the anhydrous forms appear as small needles and are stable to air exposure, whereas the third form is morphologically similar but quickly absorbs water from the atmosphere and converts back to the commercial form. The high-temperature modification is achieved …

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The Ultrafast Photoisomerizations Of Rhodopsin And Bathorhodopsin Are Modulated By Bond Length Alternation And Hoop Driven Electronic Effects, Igor Schapiro, Mikhail Nikolaevich Ryazantsev, Luis Manuel Frutos, Nicolas Ferre, Roland Lindh, Massimo Olivucci Mar 2011

The Ultrafast Photoisomerizations Of Rhodopsin And Bathorhodopsin Are Modulated By Bond Length Alternation And Hoop Driven Electronic Effects, Igor Schapiro, Mikhail Nikolaevich Ryazantsev, Luis Manuel Frutos, Nicolas Ferre, Roland Lindh, Massimo Olivucci

Chemistry Faculty Publications

Rhodopsin (Rh) and bathorhodopsin (bathoRh) quantum-mechanics/molecular-mechanics models based on ab initio multiconfigurational wave functions are employed to look at the light induced pi-bond breaking and reconstitution occurring during the Rh -> bathoRh and bathoRh -> Rh isomerizations. More specifically, semiclassical trajectory computations are used to compare the excited (S-1) and ground (S-0) state dynamics characterizing the opposite steps of the Rh/bathoRh photochromic cycle during the first 200 fs following photoexcitation. We show that the information contained in these data provide an unprecedented insight into the sub-picosecond pi-bond reconstitution process which is at the basis of the reactivity of the protein …

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Department Of Chemistry News For Alumni And Friends, March 2011, Illinois State University, Department Of Chemistry Mar 2011

Department Of Chemistry News For Alumni And Friends, March 2011, Illinois State University, Department Of Chemistry

Chem Letter

Newsletter of the Illinois State University Department of Chemistry

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Formation And Stability Of Atmospherically Relevant Isoprene-Derived Organosulfates And Organonitrates, Adam I. Darer, Neil C. Cole-Filipiak, Alison E. O'Connor, Matthew J. Elrod Mar 2011

Formation And Stability Of Atmospherically Relevant Isoprene-Derived Organosulfates And Organonitrates, Adam I. Darer, Neil C. Cole-Filipiak, Alison E. O'Connor, Matthew J. Elrod

Faculty & Staff Scholarship

Isoprene is the precursor for number of alcohol, organosulfate, and organonitrate species observed in ambient secondary organic aerosol (SOA). Recent laboratory and field work has suggested that isoprene-derived epoxides may be crucial intermediates that can explain the existence of these compounds in SOA. To confirm this hypothesis, the specific hydroxy epoxides observed in gas phase isoprene photooxidation experiments (as well as several other related species) were synthesized and the bulk phase aqueous reactions of these species in the presence of sulfate and nitrate were studied via nuclear magnetic resonance (NMR) techniques. The results indicate that both primary and tertiary organosulfates …

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Aspires At Georgia Southern University, Christine R. Whitlock, Bret S. Danilowicz, Gus J. Molina, Lisa S. Vance Mar 2011

Aspires At Georgia Southern University, Christine R. Whitlock, Bret S. Danilowicz, Gus J. Molina, Lisa S. Vance

Chemistry: Faculty Presentations (1990-2022)

Advisement and Scholarship Promoting Inquiry-based Research Experiences in STEM (ASPIRES) at Georgia Southern University is a comprehensive, strategic project that will increase the number of students graduating with bachelor's degrees in STEM fields. Five action items address two interrelated goals: (1) to increase retention of STEM students and (2) to improve academic success in science and math courses. The project ended in 2012.

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Determination Of Caffeine As A Marker For Septic Tank Contamination Of Wilgreen Lake, Rosemary Onjiko, Susan Godbey, Walter S. Borowski, Darrin Smith, Lori Wilson Mar 2011

Determination Of Caffeine As A Marker For Septic Tank Contamination Of Wilgreen Lake, Rosemary Onjiko, Susan Godbey, Walter S. Borowski, Darrin Smith, Lori Wilson

EKU Faculty and Staff Scholarship

Wilgreen Lake in Richmond, Kentucky, has been listed by both the state and the Environmental Protection Agency as an “impaired” lake due to excess nutrients, which may be in part contributed by domestic septic systems. Caffeine can be used as an anthropogenic marker to estimate the contribution of septic tank effluent to the lake. We have modified existing analytical methods to produce a viable method for the determination of caffeine in environmental water samples and applied the method to water samples collected from Wilgreen Lake. The modified method allows determination of caffeine in a concentration range of 75 to 10,000 …

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Eva-Layered Double Hydroxide (Nano)Composites: Mechanism Of Fire Retardancy, Xiaolan Wang, Rajendra Rathore, Ponusa Songtipya, Maria Del Mar Jimenez-Gasco, Evangelos Manias, Charles A. Wilkie Mar 2011

Eva-Layered Double Hydroxide (Nano)Composites: Mechanism Of Fire Retardancy, Xiaolan Wang, Rajendra Rathore, Ponusa Songtipya, Maria Del Mar Jimenez-Gasco, Evangelos Manias, Charles A. Wilkie

Chemistry Faculty Research and Publications

Composites of ethylene-vinyl acetate copolymer with two different layered double hydroxides have been obtained by melt blending and these have been characterized by X-ray diffraction, transmission electron microscopy, thermogravimetric analysis, thermogravimetric analysis connected to mass spectroscopy and cone calorimetry. There is some small difference in dispersion between the zinc-containing and the magnesium-containing layered double hydroxides in EVA, but both these are microcomposites with good dispersion at the micrometer level and relatively poor dispersion at the nanometer level. There is a good reduction in the peak heat release rate at 10% LDH loading. In addition to chain stripping, which involves the …

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Synthesis Of Hydroxy- And Polyhydroxy-Substituted 1,3-Diaminocyclohexanes, Anobick Sar, Sergey V. Lindeman, William A. Donaldson Mar 2011

Synthesis Of Hydroxy- And Polyhydroxy-Substituted 1,3-Diaminocyclohexanes, Anobick Sar, Sergey V. Lindeman, William A. Donaldson

Chemistry Faculty Research and Publications

The synthesis of hydroxy-trans-1,3-diaminocyclo­hexanes based on nitroso-Diels-Alder cycloaddition of (cyclohexadienyl)phthalimide is reported.

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Evaluation Of Stain Blocking Primer Coatings With Low Volatile Organic Compound (Voc) Content And Effects Of Drying Conditions On The Properties Of Water Reducible Coatings For Polypropylene, Megan Alexandra Hart Mar 2011

Evaluation Of Stain Blocking Primer Coatings With Low Volatile Organic Compound (Voc) Content And Effects Of Drying Conditions On The Properties Of Water Reducible Coatings For Polypropylene, Megan Alexandra Hart

Master's Theses

The California Air Resources Board (CARB) plans to reduce the volatile organic compound (VOC) limit of specialty primers, sealers, and undercoaters (SPSU), also referred to as stain blocking primers, from 350 g/L to 100 g/L in January of 2012. These coatings are primarily used as stain blocking primers over a variety of substrates, such as wood and drywall. Currently the stain blocking primers that are considered most effective are solvent based primers that contain VOC levels much higher than 100 g/L. The goal of this study is to determine if primers on the market today with a VOC content of …

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Introduction For Professor Tian Zhao-Wu, Xiamen University, Member Of Cas, Qing-Yu Wu, Yi-Chun Wu Feb 2011

Introduction For Professor Tian Zhao-Wu, Xiamen University, Member Of Cas, Qing-Yu Wu, Yi-Chun Wu

Journal of Electrochemistry

No abstract provided.

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Influence Of Electric Field On The Adsorption And Bioactivity Of Hemoglobin On A Macroporous Gold Electrode, Cui-Hong Wang, Yi-Bing Kong, Xing-Hua Xia Feb 2011

Influence Of Electric Field On The Adsorption And Bioactivity Of Hemoglobin On A Macroporous Gold Electrode, Cui-Hong Wang, Yi-Bing Kong, Xing-Hua Xia

Journal of Electrochemistry

The adsorption and bioactivity of proteins at interfaces have been widely studied due to their important role in the construction of biosensors,bioelectronics and biofuel cells.Interfacial electric field is one of the important factors which could affect the adsorption and bioactivity of proteins at materials surfaces.It could dramatically change the adsorption density,molecular conformation and orientation at material surfaces.In this paper,the influence of interfacial electric field on the adsorption kinetics and bioactivity of hemoglobin(Hb) on a three-dimensional(3D) macroporous gold electrode surface has been studied using electrochemical methods and infrared spectroscopy.It was found that the interfacial electric field created excess surface charge which …

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Prepartion And Characterization Of Spr Au Substrate Using Wet Chemical Plating, You-Chen Zhou, Yan-Yan Wang, Zhi-Fang Ma, Yan-Xia Jiang, Jin Qiu, Shi-Gang Sun Feb 2011

Prepartion And Characterization Of Spr Au Substrate Using Wet Chemical Plating, You-Chen Zhou, Yan-Yan Wang, Zhi-Fang Ma, Yan-Xia Jiang, Jin Qiu, Shi-Gang Sun

Journal of Electrochemistry

The present study developed a preparation method of SPR gold substrate based on water phase operation.Firstly,on the glass modified by APTMS we self-assembed a gold colloid monolayer as the catalyst bed;Secondly,using the chemical plating technique,we made the gold film increase equably within the namometer range to obtain the proper shape and thinkness of the gold film required by the SPR.The analysis results of UV-vis and TEM demonstrated that the diameter of the monolayer formed from gold nanoparticles was 2.5 nm.Moreover,SEM showed that the nanoparticle prepared by electroless gold plating was uniformly distributed,whose diameter was 40 nm.The SPR flow injection experiment …

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Preparation And Electrochemical Properties Of Sn Thin Film As Anode Materials For Lithium-Ion Batteries, Hong-Mei Bai, Zhan-Liang Tao, Fang-Yi Cheng, Jun Chen Feb 2011

Preparation And Electrochemical Properties Of Sn Thin Film As Anode Materials For Lithium-Ion Batteries, Hong-Mei Bai, Zhan-Liang Tao, Fang-Yi Cheng, Jun Chen

Journal of Electrochemistry

Sn thin films as the anode materials of Li-ion batteries were prepared by vacuum-evaporation method on the copper foam substrate. The phase structure,surface morphology and electrochemical property of the as-prepared films were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM), and galvanostatic cycling. The results showed that three-dimensional structure of copper foam substrate enhanced the adhesion strength between the active material and the substrate, under the same substrate temperature, the particles became bigger with the increasing of evaporation time, while their electrochemical property decreased, under the same evaporation time, the particles didn′t changed obviously with the increasing of substrate temperature,while their cycle …

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Synthesis Of Mesoporous Nickel Oxide For Supercapacitor Application, Xuan-Xuan Chen, Zhen-Zhen Zhao, Deng-Chao Wang, Zhong-Jie Huang, Wen-Bin Ni, Li Yu, Jian-Wei Zhao Feb 2011

Synthesis Of Mesoporous Nickel Oxide For Supercapacitor Application, Xuan-Xuan Chen, Zhen-Zhen Zhao, Deng-Chao Wang, Zhong-Jie Huang, Wen-Bin Ni, Li Yu, Jian-Wei Zhao

Journal of Electrochemistry

Mesoporous nickel oxide has been synthesized by calcining metal-organic coordination precursor.Transmission electron microscopy and BET test showed that the prepared NiO had a regular morphology and displayed a narrow size distribution.Electrochemical tests revealed that such mesoporous NiO had a specific capacity of 72 F·g-1 at the current of 2.0 A·g-1.Futhermore,the material showed excellent cycle-life stability.There was no degradation of capacitance after 1000 cycles.

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A Titanium-Supported Nanoporous Pd Electrocatalyst For Methanol Oxidation, Feng-Juan Niu, Qing-Feng Yi Feb 2011

A Titanium-Supported Nanoporous Pd Electrocatalyst For Methanol Oxidation, Feng-Juan Niu, Qing-Feng Yi

Journal of Electrochemistry

Titanium-supported nanoporous palladium electrode(nanoPd /Ti) was prepared by a hydrothermal process in the presence of the ligand EDTA and using formaldehyde as reducing agent.SEM images showed that the size of Pd particles was about 60 nm and the Pd particles were connected with each other to form a three-dimensional network structure.Cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS) were applied to evaluate the electrocatalytic activity of the nanoPd/Ti electrode towards methanol oxidation in alkaline solution.CV results showed that the nanoPd /Ti electrode presented high anodic peak densities and a low onset potential for methanol oxidation.Also nanoPd /Ti electrode showed excellent CO tolerance …

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Electrocatalytic Oxidation Of Hydrazine At Rutin Carbon Nanotubes Modified Electrode, Hong-Fang Zhang, Qing-Lin Sheng, Jian-Bin Zheng Feb 2011

Electrocatalytic Oxidation Of Hydrazine At Rutin Carbon Nanotubes Modified Electrode, Hong-Fang Zhang, Qing-Lin Sheng, Jian-Bin Zheng

Journal of Electrochemistry

The electrochemical behavior and electrocatalytic oxidation of hydrazine on rutin multiwall carbon nanotubes modified glassy carbon electrode were studied by cyclic voltammetry.The experimental results indicated that the electrode exhibits good electrocatalytic activity to hydrazine at a reduced oxidation potential of 262 mV.The amperometric response of the modified electrode showed linear increase after successive addition of hydrazine in the concentration range of 2.5×10-6~1.0×10-4 mol·L-1 with a detection limit of 5×10-7 mol·L-1.

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The Charge-Discharge Properties Of 40 Ah Aerospace Nickel Hydrogen Cell, Hai-Chang Zhang, Wen-Cheng Ming, Xue-Ying Ren, Hui-Juan Li, Hong-Min Fan, Li-Chao Li Feb 2011

The Charge-Discharge Properties Of 40 Ah Aerospace Nickel Hydrogen Cell, Hai-Chang Zhang, Wen-Cheng Ming, Xue-Ying Ren, Hui-Juan Li, Hong-Min Fan, Li-Chao Li

Journal of Electrochemistry

In present investigation,40 Ah nickel-hydrogen cell has been manufactured and its charge-discharge properties has been performed.The results indicate that the cell exhibited the best discharge capacity(50 Ah) when the test conditions were between 0~10 ℃,on the other hand,the cell accompanied with temperature being raised to 10 ℃ while the cell was subjected to discharge operating.The cell voltage decreased to -0.2 V and the cell temperature increased continuously during the over-discharge test.The cell voltage was first increased and then decreased,but the cell temperature was climbed rapidly while the cell was performed during the over-charge test.The 40 Ah nickel-hydrogen cell has excellent …

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Determinations In Reducing Degree Of Iron-Amine Complex By Cyclic Voltammetry, Yu-Kun Lai, Wei Wang Feb 2011

Determinations In Reducing Degree Of Iron-Amine Complex By Cyclic Voltammetry, Yu-Kun Lai, Wei Wang

Journal of Electrochemistry

The veracity and influence factors in reducing degree on iron-amine complex were tested by cyclic voltammetry.The types of cathode electrolytes including ferric nitrate,triethanolamine,sodium hydroxide and calcium nitrate were optimized.Compared with dip-dyeing coloration method,the cyclic voltammetry method can be used to measure the reducing degree of iron-amine complex more accurately with better stability,easier and faster operation.Potential applications of cyclic voltammetric determination method can be found in the fields of electrochemical dye production and related quality control.

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