Kinetic Study Of Photoelectrochemical Oxidation Of Lignin Model Compounds On Tio2 Nanotubes,
2012
Department of Chemistry, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B 5E1, Canada;
Kinetic Study Of Photoelectrochemical Oxidation Of Lignin Model Compounds On Tio2 Nanotubes, Min Tian, Daniel Liba, Aicheng Chen
Journal of Electrochemistry
In this study, TiO2 nanotubes were prepared via the electrochemical oxidation of titanium substrates in a non-aqueous electrolyte and their morphology and microstructures were examined by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The photoelectrochemical oxidation of two lignin model compounds, 1-(3,4-dimethoxyphenoxy)-2-(2-methoxyphenoxy)-1,3-propanediol (DMP) and 3-hydroxy-1-(3,4-dimethoxyphenoxy)-2-(2-methoxyphenoxy)-1,3-propanone (HDM), was investigated. A new band appeared at ~304 nm during the photoelectrochemical oxidation of DMP. The rate of DMP intermediate formation was amplified with the increase of initial concentrations, while it was diminished with increased temperature. Despite the similarity in structure between HDM and DMP, there are only small increases in absorbance …
Polymorphism And Polyamorphism In Bilayer Water
Confined To Slit Nanopore Under High Pressure,
2012
University of Nebraska-Lincoln
Polymorphism And Polyamorphism In Bilayer Water Confined To Slit Nanopore Under High Pressure, Jaeil Bai, Xiao Cheng Zeng
Xiao Cheng Zeng Publications
A distinctive physical property of bulk water is its rich solid-state phase behavior, which includes 15 crystalline (ice I–ice XIV) and at least 3 glassy forms ofwater, namely, low-density amorphous, highdensity amorphous, and very-high-density amorphous (VHDA). Nanoscale confinement adds a new physical variable that can result in a wealth of new quasi-2D phases of ice and amorphous ice. Previous computer simulations have revealed that when water is confined between two flat hydrophobic plates about 7–9 Å apart, numerous bilayer (BL) ices (or polymorphs) can arise [e.g., BL-hexagonal ice (BL-ice I)]. Indeed, growth of the BL-ice I through vapor deposition on …
Ultra-Stable Protein-Polymer Bioconjugates,
2012
University of Connecticut
Ultra-Stable Protein-Polymer Bioconjugates, Kyle S. Cole
Master's Theses
No abstract provided.
Interactions Of Aqueous Ag+ With Fulvic Acids: Mechanisms Of Silver Nanoparticle Formation And Investigation Of Stability,
2012
Florida Institute of Technology
Interactions Of Aqueous Ag+ With Fulvic Acids: Mechanisms Of Silver Nanoparticle Formation And Investigation Of Stability, Nathaniel F. Adegboyega, Virender K. Sharma, Karolina Siskova, Radek Zboril, Mary Sohn, Brian J. Schultz, Sarbajit Banerjee
Chemistry and Chemical Engineering Faculty Publications
This study investigated the possible natural formation of silver nanoparticles (AgNPs) in Ag+ −fulvic acid (FA) solutions under various environmentally relevant conditions (temperature, pH, and UV light). Increase in temperature (24−90 °C) and pH (6.1−9.0) of Ag+ −Suwannee River fulvic acid (SRFA) solutions accelerated the appearance of the characteristic surface plasmon resonance (SPR) of AgNPs. The rate of AgNP formation via reduction of Ag+ in the presence of different FAs (SRFA, Pahokee Peat fulvic acid, PPFA, Nordic lake fulvic acid, NLFA) and Suwannee River humic acid (SRHA) followed the order NLFA > SRHA > PPFA > SRFA. This order was found to be …
Controlling Nanoparticle Dispersion For Nanoscopic Self-Assembly,
2012
California Polytechnic State University, San Luis Obispo
Controlling Nanoparticle Dispersion For Nanoscopic Self-Assembly, Nathan S. Starkweather
Master's Theses
Nanotechnology is the manipulation of matter and devices on the nanometer scale. Below the critical dimension length of 100nm, materials begin to display vastly different properties than their macro- or micro- scale counterparts. The exotic properties of nanomaterials may trigger the start of a new technological revolution, similar to the electronics revolution of the late 20th century. Current applications of nanotechnology primarily make use of nanoparticles in bulk, often being made into composites or mixtures. While these materials have fantastic properties, organization of nano and microstructures of nanoparticles may allow the development of novel devices with many unique properties. …
A New Random Walk Simulation Model For Study Of Diffusion Behavior Of Single Particle Within Two-Dimensional Space,
2012
State Key Lab of A nalytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210008, China;
A New Random Walk Simulation Model For Study Of Diffusion Behavior Of Single Particle Within Two-Dimensional Space, Jianwei Zhao, Lili Chen, Yingqiang Fu, Shaohong Li, Tiannan Chen, Shijie Zhang
Journal of Electrochemistry
Research on diffusion behaviors is of significant value in that it is closely related to transport phenomena in micro-chemistry. However, the effects of variables on diffusion are still unclear. Here, we developed and programmed a simulation methodology along with data analysis, which was capable to simulate the diffusion of a particle within twodimensional heterogeneous space in large timescale; the effects of periodically arranged impenetrable barriers of specific shape and lateral drifting velocity on diffusion behavior were studied. As well as standard mean square displacement analysis, a new method, the appearance probability distribution method, was introduced, which revealed whether the particle …
Electrochemical Synthesis Of Silver-Tetracyanoquinodimethane Nanorods At Agar Supported Water/1,2-Dichloroethane Interface,
2012
Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, Fujian, China;
Electrochemical Synthesis Of Silver-Tetracyanoquinodimethane Nanorods At Agar Supported Water/1,2-Dichloroethane Interface, Li Huang, Yixian Wang, Michael V. Mirkin, Bin Ren, Dongping Zhan
Journal of Electrochemistry
Silver-tetracyanoquinodimethane (AgTCNQ) is an important charge transfer salt due to its high conductivity and other electronic properties. In this communication, we report the synthesis of AgTCNQ at the liquid/liquid interface. Agar was used as a gelling agent to support water/1,2-dichloroethane (DCE) interface. Silver ions were transferred from the hydrogel into DCE phase, where they combined with TCNQ- to form AgTCNQ nanorods. The developed method can provide a new route for synthesis of functional materials based on the electrochemistry at the liquid/liquid interface.
Underpotential Deposition Of Copper On Pt(S)[N(100)X(110)] Stepped Surfaces,
2012
Instituto de Electroquímica, Universidad de Alicante, Ap. 99, E-03080 Alicante, Spain;
Underpotential Deposition Of Copper On Pt(S)[N(100)X(110)] Stepped Surfaces, Gisbert Rubn, Climent Vctor, Herrero Enrique, M. Feliu Juan
Journal of Electrochemistry
The underpotential deposition of Cu on platinum stepped surfaces composed of (100) terraces and (110) monoatomic steps has been studied in different acidic solutions. It has been found that the initial stage of copper deposition on the surface takes place simultaneously on terrace and step sites, irrespective of the nature of the adsorbing anion. During the voltammetric deposition of a full monolayer, several peaks can be observed. The analysis of the dependence of the peak charge with the step density allows assigning the different peaks to different deposition sites. The peak appearing at most positive potentials corresponds to the deposition …
Foreword,
2012
State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China;
Foreword, Bin Ren
Journal of Electrochemistry
On the request of Prof. Shi-Gang Sun, Editor-in-Chief of Journal of Electrochemistry, I served as the guest editor for this International Special Issue on Current Electrochemistry. The Journal of Electrochemistry was founded in 1995 associated to the Chinese Chemical Society just before the 46th Annual meeting of the International Society of Electrochemistry (ISE). Prof. Zhao-Wu Tian was the founder of the journal and had been serving as the Editor-in-Chief until 2010. The journal is known for high quality scientific papers related to the electrochemical science, techniques and engineering, and is well-known in Electrochemistry Community in China. However, the journal …
In Situ Pm-Irras Studies Of A Floating Bilayer Lipid Membrane At Au(111) Electrode Surface,
2012
Department of Chemistry, University of Guelph, Guelph, Ontario N1G 2W1, Canada;
In Situ Pm-Irras Studies Of A Floating Bilayer Lipid Membrane At Au(111) Electrode Surface, Su Zhangfei, Kycia Annia, Jay Leitch J., Lipkowski Jacek
Journal of Electrochemistry
In situ Polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS) was used to study the structure of a DMPC + cholesterol + GM1 floating bilayer lipid membrane (fBLM) at a Au(111) surface. 1-thio-beta-D-glucose (beta-Tg) was self-assembled onto the Au electrode to increase the overall hydrophilicity of the surface. The fBLM was deposited on the beta-Tg self-assembled monolayer (SAM) using a combination of Langmuir-Blodgett/Langmuir-Schaefer (LB/LS) techniques. The carbohydrate headgroups of the GM1 molecules were physically adsorbed to the beta-Tg SAM forming a water rich cushion between the fBLM and the modified gold substrate. The PM-IRRAS spectra indicate that the DMPC molecules within …
Electrochemical Detection Of Ammonia In Aqueous Solution Using Fluorescamine: A Comparison Of Fluorometric Versus Voltammetric Analysis,
2012
Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom;
Electrochemical Detection Of Ammonia In Aqueous Solution Using Fluorescamine: A Comparison Of Fluorometric Versus Voltammetric Analysis, Panchompoo Janjira, G. Compton Richard
Journal of Electrochemistry
Fluorescamine is a non-fluorescent reagent widely used for the quantitative determination of primary amines by fluorescence spectroscopy as it reacts readily with primary amines to form a fluorescent product. In this work, a new sensitive voltammetric method for the detection of ammonia in aqueous solution by the reaction with fluorescamine has been developed. First, the electrochemical behaviour of fluorescamine in the absence and presence of ammonia was investigated in 0.1 mol L-1 borate buffer solution (pH 9.0) by cyclic voltammetry using a glassy carbon (GC) electrode. As for fluorescamine itself, a well-defined irreversible oxidation peak could be observed at …
The Electrochemical Properties Of 1-Pyrenebutyric Acid/Graphene Composites And Their Application In Glucose Biosensors,
2012
State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China;
The Electrochemical Properties Of 1-Pyrenebutyric Acid/Graphene Composites And Their Application In Glucose Biosensors, Min Wang, Jiong Wang, Fengbin Wang, Xinghua Xia
Journal of Electrochemistry
The electrochemical properties of 1-pyrenebutyric acid/graphene composites (PBA/G) obtained by one-step synthesis via π-π stacking was investigated. The electrochemical impedance titration curve shows the surface charge changes as function of solution pH by using ferricyanide/ferrocyanide redox couple as the probe. An apparent pKa value is estimated as 6.2 according to the impedance titration curve. In addition, a glucose biosensor was constructed by immobilizing glucose oxidase (GOD) on the surface of PBA/G via covalent interaction. This biosensor shows a linear response to glucose within the concentration up to 5 mmol L-1 with a detection limit of 0.085 mmol L …
The Oxidation Of Hydrogen Peroxide On Nanostructured Rhodium Microelectrodes,
2012
Chemistry, University of Southampton, Southampton, SO17 1BJ, UK;
The Oxidation Of Hydrogen Peroxide On Nanostructured Rhodium Microelectrodes, N. Bartlett Philip, F. Esterle Thomas
Journal of Electrochemistry
Mesoporous Rh films were deposited onto platinum microelectrodes from the H1 lyotropic liquid crystalline phase of C12EO8 (octaethyleneglycol monododecyl ether). The electrodes show well defined voltammetry for the oxidation and the reduction of hydrogen peroxide at low concentrations (<10 mmol•L-1) with excellent stability for operation at neutral pH. Based on the hysteresis in the current and the potential dependence the oxidation of hydrogen peroxide occurs through a CEE mechanism involving Rh(OH)3 on the mesoporous Rh electrode surface. At higher hydrogen peroxide concentrations the current reaches a plateau that is due to either saturation of the binding sites for hydrogen peroxide or limitation of the reaction due to acidification of the solution within the pores. For the thin films (below 200 nm) the hydrogen peroxide calibration curves we …
Organics In Environmental Ices: Sources, Chemistry, And Impacts,
2012
Columbia University
Organics In Environmental Ices: Sources, Chemistry, And Impacts, V. F. Mcneill, A. M. Grannas, J. P. D. Abbatt, M. Ammann, P. Ariya, T. Bartels-Rausch, F. Domine, D. J. Donaldson, Marcelo I. Guzman, D. Heger, T. F. Kahan, P. Klán, S. Masclin, C. Toubin, D. Voisin
Chemistry Faculty Publications
The physical, chemical, and biological processes involving organics in ice in the environment impact a number of atmospheric and biogeochemical cycles. Organic material in snow or ice may be biological in origin, deposited from aerosols or atmospheric gases, or formed chemically in situ. In this manuscript, we review the current state of knowledge regarding the sources, properties, and chemistry of organic materials in environmental ices. Several outstanding questions remain to be resolved and fundamental data gathered before an accurate model of transformations and transport of organic species in the cryosphere will be possible. For example, more information is needed regarding …
The Influence Of Auxiliary Ligands On The Photophysical Characteristics Of A Series Of Ruthenium (Ii) Polypyridyl Complexes,
2012
Technological University Dublin
The Influence Of Auxiliary Ligands On The Photophysical Characteristics Of A Series Of Ruthenium (Ii) Polypyridyl Complexes, Luke O'Neill, Laura Perdisatt, Christine O'Connor
Articles
A series of ruthenium polypyridyl complexes were studied using UV/Vis absorption and luminescence spectroscopy as well as luminescence lifetime determination by time correlated single photon counting (TCSPC). The complexes were characterised with regard to the variation in the electronic band-gap as a result of the sequential variation of the auxiliary ligand 2,2’-bipyridine (bpy), 1,10-phenanthroline (phen) and 2,2’-biquinoline (biq) ligands while the main ligand remained constant for three different main ligand types. Luminescence yields were calculated and correlated with structural and electronic variation. It was found that both the absorption and emission characteristics could be tailored through the systematic variation of …
Structure To Function: Case Studies Of Hotdog-Fold Superfamily Thioesterases From Escherichia Coli,
2012
University of New Mexico
Structure To Function: Case Studies Of Hotdog-Fold Superfamily Thioesterases From Escherichia Coli, John A. Latham
Chemistry and Chemical Biology ETDs
My doctoral research primarily focuses on the Escherichia coli hotdog-fold thioesterases ydiI and ybgC. The ydiI gene is colocalized in the operon ydiHIJ. A substrate screen provided evidence that YdiI prefers aryl-CoA substrates and discriminated against the analogous aryl-ACP, unlike the paralog YbdB which works on 2,4-DHB-EntB in the enterobactin synthesis pathway. A bioinformatic approach showed that in some bacteria, ydiI is colocalized with genes from the menaquinone pathway. YdiI was shown to catalyze the hydrolysis of DHNA-CoA with physiological relevance (kcat/KM ~ 105). Furthermore, the E. coli YdiI- strain was shown to …
Discharge Curve Fitting Of Lifepo4 Based On Impedance Model,
2012
Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;
Discharge Curve Fitting Of Lifepo4 Based On Impedance Model, Ming Wang, Jian-Jun Li, Xiang-Ming He, Peng Bai, Gan Wu, Chun-Rong Wan, Guang-Yu Tian
Journal of Electrochemistry
In this paper, an impedance model is developed for simulating the discharge curve of LiFePO4 cathode material. The voltage drop is divided into three parts: the Ohm voltage drop, the charge transfer voltage drop and the diffusion voltage drop. A theoretical expression has been derived to predict the discharge curves at various discharge rates. The parameters of the equation have been obtained by fitting the results of EIS measurement, and a good agreement between the fitting and the experimental data has been found at all discharge rates.
Poly(Aniline/O-Nitroaniline): A High Capacity Cathode Material For Lithium Ion Batteries,
2012
College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, China;
Poly(Aniline/O-Nitroaniline): A High Capacity Cathode Material For Lithium Ion Batteries, Rui-Rui Zhao, Li-Min Zhu, Jiang-Feng Qian, Han-Xi Yang
Journal of Electrochemistry
Polyaniline can be used as a high capacity cathode material due to the advantages of material abundance and synthetic simplicity. However, its practical application in battery has been hindered by poor electrochemical utilization and cycling instability. To solve these problems, we synthesized the poly(aniline/o-Nitroaniline) (P(AN-oNA)) by introducing the electron-drawing group-nitroaniline onto the polyaniline chains, so as to enhance electrochemical utilization and stability of the polyaniline derivative. The as-prepared Li/P(AN-oNA) copolymer shows a greatly enhanced discharge capacities of 186 mAh·g-1 at initial cycles, about 37% higher than its parent PAN, and remains 168 mAh·g-1 after 60th cycle. Also, the …
Influences Of Particle Size And Sulfuric Acid Treatment On The Electrochemical Performance Of Bamboo Charcoal,
2012
Department of Chemistry, Institute of New Energy, Shanghai Key Laboratory of Molecular Catalysisand Innovative Materials, Fudan University, Shanghai 200438, China
Influences Of Particle Size And Sulfuric Acid Treatment On The Electrochemical Performance Of Bamboo Charcoal, Yu Yao, Ai-Shui Yu
Journal of Electrochemistry
The bamboo charcoal had been milled and treated by sulfuric acid. The influences of as-prepared material particle size and sulfuric acid treatment on the electrochemical performance had been studied. The result displays that the bamboo charcoal with mean particle size about 5 μm has the best first coulombic efficiency. Sulfuric acid treatment could raise the discharge capacity of bamboo charcoal, and the first discharge capacity of 328.2 mAh·g-1 was obtained with the bamboo charcoal treated by sulfuric acid for 18 h. Furthermore, the capacity of 302.3 mAh·g-1 could be maintained for 50 cycles, showing good cycle performance.
Preparation And Performance Of Sn-Co-M-C（M = Zn, Fe）Composites As An Anode Material,
2012
Institute of Chemical Power Sources, Soochow University, Suzhou 215006, Jiangsu, China
Preparation And Performance Of Sn-Co-M-C（M = Zn, Fe）Composites As An Anode Material, Guo-Qing Fang, Wei-Wei Liu, Shi-Ci He, Qian Zhang, Jun-Wei Zheng, De-Cheng Li
Journal of Electrochemistry
The anode materials of Sn-Co-M-C (M = Zn, Fe) composites were prepared by carbothermal reduction method from metal oxides and sucrose in N2 atmosphere. Their structural and electrochemical properties were studied by XRD, SEM and charge-discharge test. Among them, the Sn-Co-Zn-C composite showed higher specific capacity and good cycle performance. The initial specific discharge capacity of 571 mAh·g-1 could be obtained, while 369 mAh·g-1 was still kept after 45 cycles.
