Digital Commons Network^™

Fabrication Of Gold Electrode Array Based On Co2 Laser Ablation, Wei Zhang, Jiang-Qun Xiao, Yong-Liang Zhou

Journal of Electrochemistry

A rapid process is described to produce single or multiple electrodes of any shape based on CO₂ laser ablation for microfluidic chip.The method is as follow: coating a kind of material as sacrifice layer on a piece of glass with sputtered Cr and Au;designing the needed pattern on a computer;selecting proper parameters and ablating with CO₂ laser;wiping of Au/Cr and sacrifice layer,and obtain electrodes at last.The microfluidic chip was gotten by reversely bonding with a piece of PDMS,and sealing around with PDMS prepolymer.The mask' effect is the main factor that influencing electrode quality.The width of electrodes could be …

Preparation And Electrochemical Characterization Of Anatase Tio2 Nanotubes, Bin Cao, Jin-Wei Xu, Ling-Hong Ding, Wei-Feng Zhang

Journal of Electrochemistry

Titanium oxide nanotubes were prepared by hydrothermal treatment of anatase-type TiO₂ powders and NaOH solution in an autoclave.Transmission Electron Microscopy and X-ray Diffraction showed that the product is anatase-type TiO₂ nanotubes.The constant charge-discharge current and cyclic voltammetry exhibited the TiO₂ nanotubes have a large initial lithium insertion capacity of 260 mA·h/g and good reversibility.This study indicates that TiO₂ nanotubes might be a good negative electrode materical for second lithium battery in the future.

Novel Electrochemical Method For Synthesis Of Nanostructured Materials Of Noble Metals Based On Poly(N-Vinylpyrrolidone) (Pvp), Wei Pan, Xiao-Kai Zhang, Ming-Hu Huang, Shao-Xin Huang, Xing-Li Feng, Hou-Yi Ma

Journal of Electrochemistry

Gold nanocrystals with controllable size were synthesized through a simple electroreduction method using poly(N-vinylpyrrolidone)(PVP) of different polymerization degree as both stabilizer and shape-controller for gold nanoclusters.Individual gold nanoparticles spontaneously assembled into the wire-and ring-shaped nanoparticle aggregates depending on the PVP's dynamic stretching and curling,and precursor nanoparticles grew into flat,single-crystalline nanoprisms with thickness of dozens of nanometers based on the oriented aggregation between particles.Besides,core-shell Au/Ag nanoparticles were conveniently synthesized through two-step electroreduction of noble metal ions in the presence of PVPK30.The electrochemical synthetic method based on PVP provides a new path for preparation of noble metal nanostructured materials with different shape …

Phase-Transfer Technique For Polymer-Protected Noble Metal Nanoparticles, Xing-Li Feng, Ming-Hui Huang, Xiao-Kai Zhang, Shao-Xin Huang, Wei Pan, Hou-Yi Ma

Journal of Electrochemistry

A novel phase-transfer method was developed based on the decrease of PVP's solubility in water with increasing temperature,by means of which PVP-protected gold,silver and platinum nanoparticles can be conveniently transferred from aqueous phase to 1-butanol phase.Monodispersed metal nanoparticles were electrochemically synthesized at first in the aqueous,and then 1-butanol of appropriate volume was added to the aqueous phase.Heating the oil-water mixture to 80 ℃ under vigorous stirring would make metal nanoparticles leave the aqueous phase and enter into the 1-butanol phase,with high phasetransfer efficiency and without aggregation between nanoparticles.An electrochemical method to synthesize metal nanoparticles in the oil-water mixtures was further …

Study Of The Electrooxidation Of Glycerol On Oxide And Pd/C Composite Catalysts, Zhi-Yuan Yan, Chang-Wei Xu, Pei-Kang Shen

Journal of Electrochemistry

Oxide and Pd on carbon composite catalysts have been prepared by intermittent microwave heating(IMH) method.The performance of the catalysts for glycerol oxidation in alkaline solution is studied by electrochemical techniques.It is shown that the Pd/C catalyst is active for glycerol electrooxidation.However,the oxide-Pd/C catalysts are even better in terms of the onset potential that is more negative and peak current density.The ratio of oxide to Pd is optimized according to the electrochemical measurement.The results reveal that the addition of oxide into the Pd/C induces the synergistic effect for glycerol electrooxidation.

Deep Treatment Of Pulping Wastewater Using Three Phase Fluidized Bed Electrode Reactor, Dan Wu, Qi-Cai Shi, Ji-Ti Zhou, Bao-Jun Jia

Journal of Electrochemistry

Treatment of pulping wastewater by using a novel electrochemical reactor,i.e.the three phase fluidized bed electrode,reactor were invesigated.The effects of air flow rate,applied voltage,pH value and FeSO₄ concentration on electrolysis efficiency were investigated.It was clearly shown that the 20 V of voltage,0.3 m³·h^-1 of air flow rate,1000 mg L^-1 of FeSO₄ concentration and pH≈2.5 were its best conditions.COD removal could be 70.1% under these conditions.

Electrochemical Properties Of The Modified Carbon Nanotubes, Chun-An Ma

Journal of Electrochemistry

Powder micro-electrodes were prepared from raw carbon nanotubes and carbon nanotubes modified by carboxyl.The electro-reduction properties of both the raw and open-ended carbon nanotubes in p-Nitrophenol solution were investigated.The FTIR spectrum result indicated that the functional groups are successfully fixed on the surface of the carbon nanotubes after nitric acid treatment.The cyclic voltammetry results show that the electrochemical activity of carboxyl-modified carbon nanotubes was improved.The mechanism of electro-(reduction) for the carbon nanotubes after acid treatment was discussed.

Studies And Applications Of Phosphoric Acid Treatment On Low Voltage Formed Aluminum Foils, Lan Sun, Hui-Rong Qiu, Hui-Zhong Tan, Xue-Yan Chen, Chang-Jian Lin

Journal of Electrochemistry

The surface of low voltage formed foil for Al electrolysis capacitors is treated with phosphoric acid solution.The effects of concentration of phosphoric acid solution,temperature and process time on specific capacitance and the time of hydration resistance with standing voltage are studied.The optimum condition is presented.The properties of low voltage formed foil have been improved by applying this method on the product line.

Mustang Daily, November 28, 2006

Cal Poly Student Newspaper

Student newspaper of California Polytechnic State University, San Luis Obispo, CA.

A Parallel Unmixing Algorithm For Hyperspectral Images, Stefan A. Robila, Lukasz G. Maciak

Department of Computer Science Faculty Scholarship and Creative Works

We present a new algorithm for feature extraction in hyperspectral images based on source separation and parallel computing. In source separation, given a linear mixture of sources, the goal is to recover the components by producing an unmixing matrix. In hyperspectral imagery, the mixing transform and the separated components can be associated with endmembers and their abundances. Source separation based methods have been employed for target detection and classification of hyperspectral images. However, these methods usually involve restrictive conditions on the nature of the results such as orthogonality (in Principal Component Analysis - PCA and Orthogonal Subspace Projection - OSP) …

Volume 44, Number 28: November 28, 2006, University Of North Dakota

University Letter Archive

No abstract provided.

The Daily Egyptian, November 28, 2006, Daily Egyptian Staff

November 2006

No abstract provided.

The Spinnaker Vol. 30 No. 15, University Of North Florida

Spinnaker

Student newspaper for the UNF community

The Hilltop 11-28-2006, Hilltop Staff

The Hilltop: 2000 - 2010

No abstract provided.

Spartan Daily, November 28, 2006, San Jose State University, School Of Journalism And Mass Communications

Spartan Daily (School of Journalism and Mass Communications)

Volume 127, Issue 50

Deposition Of Metallic Nanoparticles On Carbon Nanotubes Via A Fast Evaporation Process, Guoqiang Ren, Yangchuan Xing

Chemical and Biochemical Engineering Faculty Research & Creative Works

A new technique was developed for the deposition of colloidal metal nanoparticles on carbon nanotubes. It involves fast evaporation of a suspension containing sonochemically functionalized carbon nanotubes and colloidal nanoparticles. It was demonstrated that metallic nanoparticles with different sizes and concentrations can be deposited on the carbon nanotubes with only a few agglomerates. the technique does not seem to be limited by what the nanoparticles are, and therefore would be applicable to the deposition of other nanoparticles on carbon nanotubes. PtPd and CoPt3 alloy nanoparticles were used to demonstrate the deposition process. It was found that the surfactants used to …

New Immigrant Settlements In Rural America: Problems, Prospects, And Policies, Leif Jensen

Carsey Publications

Regions of rural America are being reshaped by growing numbers of immigrants who are choosing small-town life over the bright lights of the big city. This study found that immigrant settlers may have a big impact on small, rural communities—sometimes straining resources but also offering promise for reinvigorating dying communities.

Academic Senate - Meeting Minutes, 11/28/2006, Academic Senate

Academic Senate Minutes

No abstract provided.

Stm Tip-Induced Nanostructuring-Replacement Method To Construct Pt Surface Nanostructures, Jin-Gang Wang, Jing Tang, Zhao-Bin Chen, Bing-Wei Mao

Journal of Electrochemistry

STM tip-induced surface nanostructuring based on "Jump-to-contact" mechanism is a nanostructuring technique that has the highest resolution in aqueous solutions.However,for metals that have high cohesive energy,atoms would transfer from surface to tip instead,which limits the wide application of this technique.In this paper,we present a two-step Nanostructuring-Replacement method to construct metal nanoclusters that cannot be obtained directly via the "Jump-to-contact" mechanism.The method is demonstrated to construct Pt nanoclusters that are of great interest in catalysis and electrocatalysis but cannot be constructed via the "Jump-to-contact" mechanism.Since Cu is the most intensively studied and successful system in the tip-induced nanostructuring,it is utilized as …

Reaction Mechanism Of V(Ⅳ)/V(Ⅴ) Redox Couple At Graphite Felt Composite Electrode Bonded With Conductive Carbon Plastic, Xiao-Gang Li, Ke-Long Huang, Su-Qin Liu, Ning Tan, Li-Quan Chen

Journal of Electrochemistry

The rate-determining step of V(Ⅳ) /V(Ⅴ) redoxreaction was investigated at graphite felt(GF)composite electrode by various techniques: cyclic voltammetry,polarization curve and impedance spectroscopy.Cyclic voltammetry analysis indicated that V(Ⅳ) /V(Ⅴ) redox reaction at GF electrode is quasi reversible.Acertain chemical reaction step is suspected to follow the electron transfer step of this reaction.The Tafel slopevalue(0.124) obtained from the polarization curve agrees well with theoretical value(0.12),which supposingthe electron transfer step was the rate-determining step.Impedance Spectroscopies at various potentials werestudied and simulated by equivalentcircuits.The impedance value of the electron transfer step modified is greatlyhigher than the others,which shows that the electron transfer step is the …

The Synthesis, Structure And Electrochemical Performances Of Lithium Iron Phosphate, Hui Xie, Zhen-Tao Zhou

Journal of Electrochemistry

The lithium iron phosphate cathode materials were synthesized by solid-state reaction combined high-rate ball milling under the temperature ranging from 400 ℃ to 700 ℃.The crystalline structure, morphology of particles, and electrochemical performance of the sample were investigated by X-ray diffraction, scanning electron microscopy and charge-discharge test. The results showed that the sintering temperature had great influences on the crystal structure, morphology and electrochemical performances of LiFePO₄. The sample synthesized under 600℃ showed the best charge-discharge performances with the first specific discharge capacity of(128.8) mAh/g and the 15^th specific discharge capacity of 129.1 mAh/g at 0.1C rate, …

Structure And Electrochemical Characteristics Of Lifepo4 Prepared By The Polyacrylates-Pyrolysis-Reduction Method For Li-Ion Batteries, Li-Hong Yu, Yu-Liang Cao, Xiao-Fei Zhang, Han-Xi Yang, Xin-Ping Ai

Journal of Electrochemistry

The cathode material of olivine LiFePO₄ was prepared by a novel method of polyacrylate-pyrolysis-reduction.XRD demonstrates that the material have the olivine structure.SEM photo shows an average particle-size of about 100 nm with a well distribution.Electrochemical test of cycling at a constant current reveals the discharge capacity of 138 mAh/g and a good cycling stability.It is a novel practicable technology to prepare LiFePO₄ by using polyacrylate-pyrolysis-reduction method.

Faculty Senate Summarized Minutes, 11/28/2006, Unm Faculty Senate

Faculty Senate Meeting Minutes, 1920 - 2013

No abstract provided.

Hydraulic Modeling Study To Determine Diversion Structure Impacts - Rio Grande At Albuquerque, New Mexico -, Jungseok Ho

Civil Engineering ETDs

The primary objective of this study is to develop and use physical and numerical modeling techniques to predict the hydraulic impact on the Rio Grande induced by the Albuquerque diversion structure and its operation. A 1:24 scale distorted movable bed model, constructed and tested to investigate the hydraulic performance of the diversion structure, provided measurements for validating the numerical models developed in this study. Crushed coal was substituted for the prototype sediment particles and a 6.5 times steeper channel bed slope were employed to obtain sediment transport model similitude.

The diversion structure consists of an overshot gate system that can …

Faculty Senate Meeting Minutes, 11/28/2006, P 354-379, Unm Faculty Senate

Faculty Senate Meeting Minutes, 1920 - 2013

No abstract provided.

Faculty Senate Meeting Minutes, 11/28/2006, P 354-379, Unm Faculty Senate

Faculty Senate Meeting Minutes, 1920 - 2013

No abstract provided.

Minutes_06_11_28, Unm Faculty Senate

Faculty Senate Meeting Minutes, 1920 - 2013

Minutes from the November 28th, 2006 Facutly Senate meeting.

The Bg News November 28, 2006, Bowling Green State University

BG News (Student Newspaper)

The BGSU campus student newspaper. November 28, 2006. Volume 97-Issue 65.

Performance And Characterization Of A Large Format Solid State Imager, Jacob A. Mendez

Electrical and Computer Engineering ETDs

The purpose of this thesis is to validate the specifications of the CCD 486 as specified by Fairchild Imaging, the manufacturer of the CCD and Spectral Instruments, the manufacturer of the camera control electronics and supporting hardware. Specifications have been provided by both companies and are shown in Appendix A. This study is necessary because of the nature of the experiments to be analyzed using the CCD 486. In addition, the thesis will propose new testing methods for electronically shuttered CCD imagers that are not well understood.

Critical Race Realism: Towards An Integrative Model Of Critical Race Theory, Empirical Social Science, And Public Policy, Gregory S. Parks

ExpressO

Critical Race Theory was founded as “a race-based, systematic critique of legal reasoning and legal institutions….” Critics argue that it struggles to define its substantive mission, methodological commitments, and connection to the world outside of academia. This article attempts to provide a specific methodology—empirical social science—that is consistent with Critical Race Theory’s overarching mission and that has both applied and academic components. This methodology should ultimately 1) expose racism where it may be found, 2) identify its effects on individuals and institutions, and 3) put forth a concerted attack against it, in part, via public policy arguments. This concept, Critical …