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Articles 7951 - 7980 of 16793

Full-Text Articles in Materials Science and Engineering

Computationally Connecting Organic Photovoltaic Performance To Atomistic Arrangements And Bulk Morphology, Matthew L. Jones, Eric Jankowski Jul 2017

Computationally Connecting Organic Photovoltaic Performance To Atomistic Arrangements And Bulk Morphology, Matthew L. Jones, Eric Jankowski

Materials Science and Engineering Faculty Publications and Presentations

Rationally designing roll-to-roll printed organic photovoltaics requires a fundamental understanding of active layer morphologies optimized for charge separation and transport, and which ingredients can be used to self-assemble those morphologies. In this review article we discuss advances in three areas of computational modeling that provide insight into active layer morphology and the charge transport properties that result. We explain the computational bottlenecks prohibiting atomistically-detailed simulations of device-scale active layers and the coarse-graining and hardware acceleration strategies for overcoming them. We review coarse-grained simulations of organic photovoltaic active layers and show that high throughput simulations of experimentally-relevant length scales are now …

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Synthesis,Structure And Properties Of Ruthenium Polypyridyl Metalloligand Based Metal-Organic Frameworks, Mamatha Polapally Jul 2017

Synthesis,Structure And Properties Of Ruthenium Polypyridyl Metalloligand Based Metal-Organic Frameworks, Mamatha Polapally

Masters Theses & Specialist Projects

Metal-organic frameworks (MOFs) have been extensively studied because of their amazing applications in gas storage, purification, photocatalysis, chemical sensing, and imaging techniques. Ruthenium polypyridyl complexes have been broadly considered as photosensitizers for the conversion of solar energy and photoelectronic materials. With this aspect, we have synthesized three new ruthenium polypyridyl based MOFs ([Ru(H2bpc)Cu(bpc)(Hbpc)2(H2O)]·5H2O (1), [Ru(H2bpc)(Fe(bpc)(Hbpc)2(H2O)2]·6H2O (2) and [Ru(H2bpc)Ni(bpc)(Hbpc)2(H2O)2]·6H2O (3)) from ruthenium(III) chloride, bpc (2,2’- bipyridine-4,4’-dicarboxylic acid) ligand, and 3d M(II) metal ions (M(II)= Cu(II), Fe(II), Ni(II)). These MOFs were synthesized under hydro or solvothermal conditions by using water, ethanol or methanol as solvents. The crystal structures of the new compounds …

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Anion Exchange Membrane Capacitive Deionization Cells, Ayokunle Omosebi, Xin Gao, Nicolas Holubowitch, Zhiao Li, James Landon, Kunlei Liu Jul 2017

Anion Exchange Membrane Capacitive Deionization Cells, Ayokunle Omosebi, Xin Gao, Nicolas Holubowitch, Zhiao Li, James Landon, Kunlei Liu

Center for Applied Energy Research Faculty and Staff Publications

The electrochemical response of capacitive deionization (CDI) employing a single anion exchange membrane (AEM-CDI) is contrasted to conventional two-membrane CDI (MCDI) formed with complementary anion and cation exchange membranes. Pristine activated carbon cloth electrodes that possess native positive surface charge in solution were used as both anode (positive electrode) and cathode (negative electrode) in these cells. In a separate set of tests to investigate the impact of surface charge modification on deionization responses, the single and dual membrane cells were formed with asymmetric electrodes (AEM-aCDI and aMCDI) consisting of nitric acid oxidized electrodes that possess negative surface charge as the …

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Mechanical And Thermal Properties Of Eucalyptus Fiber Composites From Blend Between Biodegradable Poly(Butylene Succinate) And Recycled Pet, N Hongsriphan, P Dangmanee, M Mankrut, W Jantaraka Jul 2017

Mechanical And Thermal Properties Of Eucalyptus Fiber Composites From Blend Between Biodegradable Poly(Butylene Succinate) And Recycled Pet, N Hongsriphan, P Dangmanee, M Mankrut, W Jantaraka

Journal of Metals, Materials and Minerals

The goal of this study was to enhance rigidity and to reduce cost of the PBS-based composites by blending with recycled poly(ethylene terephthalate) (r-PET) and Eucalyptus fibers. Prior compounding, Eucalyptus fibers were treated with alkali and γ-methacryloxypropyl trimethoxysilane (MPS) solution for compatibility improvement. PBS and r-PET were melt blended in a twin-screw extruder with the weight ratio of 95/5, 90/10, and 80/20 wt%, and compounded with MPS treated Eucalyptus fibers using fiber loading of 3, 5, and 7 wt% of composites. Samples were characterized by tensile test, notched Izod impact test, SEM, NMR, and DSC. It was found that r-PET …

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Study On Physical, Optical And Luminescence Of Er3+ In K2o-Cao-B2o3 Glasses For Photonic Application, N Wantana, S Insiripong, Y Ruangthaweep, J Kaewkhao Jul 2017

Study On Physical, Optical And Luminescence Of Er3+ In K2o-Cao-B2o3 Glasses For Photonic Application, N Wantana, S Insiripong, Y Ruangthaweep, J Kaewkhao

Journal of Metals, Materials and Minerals

In this work, potassium calcium borate glasses doped with of Er3+ ions (KCaBEr) have been prepared by a melt quenching technique. The glass physical, optical and luminescence properties have been investigated as a function of Er2O3 concentration. Density was measured by Archimedes' principle and brought to calculate the molar volume. The optical absorption spectra were measured in the ultraviolet, visible light and near-infrared regions. The emission and excitation spectra represents the strong emission from glass sample. All results indicate the potential to use KCaBEr glass in the photonic applications such as laser and optical amplification.

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Eu3+ Doped Borosilicate Glass For Solid-State Luminescence Material, S Rakpanich, N Wantana, Y Ruangthaweep, J Kaewkhao Jul 2017

Eu3+ Doped Borosilicate Glass For Solid-State Luminescence Material, S Rakpanich, N Wantana, Y Ruangthaweep, J Kaewkhao

Journal of Metals, Materials and Minerals

The Eu3+ doped potassium borosilicate (KBSi:Eu3+) glasses were prepared by the melt quenching technique. The physical, optical and luminescence properties of glasses were investigated. Glass density and molar volume increase with increasing of Eu2O3 concentration. Glasses absorbed photons in the visible light and near infrared region. Since 394 nm excitation, glasses emitted the strong light with 613 nm in milliseconds of lifetime. CIE 1931 chromaticity diagram exhibits that emission from KBSi:Eu3+ glass is reddish-orange light. In summary, this KBSiEu glass performs the interesting property for using in the photonic devices such as solid-state laser and LEDs.

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Antireflective Surface Of Nanostructures Fabricated By Cf4 Plasma Etching, W Somrang, S Denchitcharoen, P Eiamchai, M Horprathum, C Chananonnawathorn Jul 2017

Antireflective Surface Of Nanostructures Fabricated By Cf4 Plasma Etching, W Somrang, S Denchitcharoen, P Eiamchai, M Horprathum, C Chananonnawathorn

Journal of Metals, Materials and Minerals

In this research, the nanostructures surface were fabricated by the CF4 plasma etching process on the SiO2-based substrates for antireflection applications. The nickel films were firstly deposited on the substrates by the sputtering system. The prepared Ni layers were then annealed at 500°C for 1 minute in order to promote dewetting process to be used as metal masks. During the etching process, CF4 etching condition was performed for 15-60 min to create the SiO2 nanopillars. After the etching process, the samples were immersed in nitric acid for 5 min to remove the nickel masks. The SiO2 nanopillars without Ni were …

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Effect Of Sputtering Power On The Structure Of Dc Magnetron Sputtered Vanadium Nitride Thin Films, A Buranawong, N Witit-Anun Jul 2017

Effect Of Sputtering Power On The Structure Of Dc Magnetron Sputtered Vanadium Nitride Thin Films, A Buranawong, N Witit-Anun

Journal of Metals, Materials and Minerals

Vanadium nitride (VN) thin films were deposited on Si substrates by reactive DC unbalanced magnetron sputtering. Effect of sputtering power on the structure of the as-deposited films was investigated. The crystal structure, thickness, roughness, surface morphology and chemical composition of the films were characterized by X-ray diffraction (XRD), atomic force microscopy (AFM), field emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectroscopy (EDS), respectively. The results showed that the as-deposited VN thin films had fcc structure with (111), (200) and (220) planes, varying with the sputtering power. The crystallite size and lattice constant of films were in the range …

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Size And Shape Distributions Of Primary Crystallites In Titania Aggregates, Eric A. Grulke, Kazuhiro Yamamoto, Kazuhiro Kumagai, Ines Häusler, Werner Österle, Erik Ortel, Vasile-Dan Hodoroaba, Scott C. Brown, Christopher Chan, Jiwen Zheng, Kenji Yamamoto, Kouji Yashiki, Nam Woong Song, Young Heon Kim, Aleksandr B Stefaniak, D. Schwegler-Berry, Victoria A. Coleman, Åsa K. Jämting, Jan Herrmann, Toru Arakawa, Woodrow W. Burchett, Joshua W. Lambert, Arnold J. Stromberg Jul 2017

Size And Shape Distributions Of Primary Crystallites In Titania Aggregates, Eric A. Grulke, Kazuhiro Yamamoto, Kazuhiro Kumagai, Ines Häusler, Werner Österle, Erik Ortel, Vasile-Dan Hodoroaba, Scott C. Brown, Christopher Chan, Jiwen Zheng, Kenji Yamamoto, Kouji Yashiki, Nam Woong Song, Young Heon Kim, Aleksandr B Stefaniak, D. Schwegler-Berry, Victoria A. Coleman, Åsa K. Jämting, Jan Herrmann, Toru Arakawa, Woodrow W. Burchett, Joshua W. Lambert, Arnold J. Stromberg

Chemical and Materials Engineering Faculty Publications

The primary crystallite size of titania powder relates to its properties in a number of applications. Transmission electron microscopy was used in this interlaboratory comparison (ILC) to measure primary crystallite size and shape distributions for a commercial aggregated titania powder. Data of four size descriptors and two shape descriptors were evaluated across nine laboratories. Data repeatability and reproducibility was evaluated by analysis of variance. One-third of the laboratory pairs had similar size descriptor data, but 83% of the pairs had similar aspect ratio data. Scale descriptor distributions were generally unimodal and were well-described by lognormal reference models. Shape descriptor distributions …

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Metallographic Analysis And Electrical Resistivity Of The 1045 Steel After Being Heat-Treated, M Quiroga Agurto, E Medrano Atencio, F Américo Reyes Navarro, J G Miranda Ramos Jul 2017

Metallographic Analysis And Electrical Resistivity Of The 1045 Steel After Being Heat-Treated, M Quiroga Agurto, E Medrano Atencio, F Américo Reyes Navarro, J G Miranda Ramos

Journal of Metals, Materials and Minerals

Herein, it was studied the structural evolution of the AISI 1045 steel water-quenched and oilquenched, respectively, from a temperature higher than the critical to various temperatures between 800 and 820°C. The two quenching media were used at 16.5°C. Microstructural variations occurred in the quenched 1045 steel. Also, by using the four-terminal sensing, it was measured the evolution of the electrical resistivity of the quenched samples; it was found that quenching at different temperatures provoked a complex behavior. It was noticed a major increase in the electrical resistivity in the case of water-quenched samples. Besides, when compared samples before and after …

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Effect Of Glass Fiber Length And Content On Mechanical Properties Of Polybutylene Terephthalate, P Threepopnatkul, N Sukprasurt, W Prom-Oh, C Kulsetthanchalee Jul 2017

Effect Of Glass Fiber Length And Content On Mechanical Properties Of Polybutylene Terephthalate, P Threepopnatkul, N Sukprasurt, W Prom-Oh, C Kulsetthanchalee

Journal of Metals, Materials and Minerals

The effect of glass fiber (GF) length and content were studied on mechanical properties of polybutylene terephthalate (PBT). The glass fiber was found to be highly compatible with PBT. The PBT/6 mm GF 30% composite possessed the highest flexural modulus (FM) and flexural strength (FS). The FM and FS were increased with the increasing of GF content. The longer glass fiber resulted in the higher value of FM and FS but hardly affected on the deflection and unnotched izod impact strength of the composites. The impact strength of composites was drastically decreased with the addition of glass fiber as compared …

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Homogenization Of Plastic Deformation In Heterogeneous Lamella Structures, Rui Yuan, Irene J. Beyerlein, Caizhi Zhou Jul 2017

Homogenization Of Plastic Deformation In Heterogeneous Lamella Structures, Rui Yuan, Irene J. Beyerlein, Caizhi Zhou

Materials Science and Engineering Faculty Research & Creative Works

It has been shown that unlike its constituent nanocrystalline (NC) phase, a heterogeneous lamella (HL) composite comprising NC and coarse-grain layers exhibits greatly improved ductility. To understand the origin of this enhancement, we present a 3D discrete dislocation, crystal plasticity finite element model to study the development of strains across this microstructure. Here we show that the HL structure homogenizes the plastic strains in the NC layer, weakening the effect of strain concentrations. These findings can provide valuable insight into the effects of material length scales on material instabilities, which is needed to design heterogeneous structures with superior properties.

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Effects Of Specimen Size And Yttria Concentration On Mechanical Properties Of Single Crystalline Yttria-Stabilized Tetragonal Zirconia Nanopillars, Ning Zhang, Mohsen Asle Zaeem Jul 2017

Effects Of Specimen Size And Yttria Concentration On Mechanical Properties Of Single Crystalline Yttria-Stabilized Tetragonal Zirconia Nanopillars, Ning Zhang, Mohsen Asle Zaeem

Materials Science and Engineering Faculty Research & Creative Works

The nanoscale plastic deformation of yttria-stabilized tetragonal zirconia (YSTZ) is highly dependent on the crystallographic orientations, i.e., dislocation is induced when the loading direction is 45° tilted to {111} and {101} slip planes, while tetragonal to monoclinic phase transformation dominates the plastic deformation when loading direction is perpendicular to the slip planes. This study investigates the effects of specimen size and yttria concentration on the mechanical response of single crystalline YSTZ nanopillars. Through uniaxial compression test, the smaller-is-stronger phenomenon is revealed in nanopillars deformed through a dislocation motion mechanism. Serrated stacking faults are observed in the smallest nanopillar, while neat …

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Elastic Properties Of Superconductors And Materials With Weakly Correlated Spins, Christian Binek Jul 2017

Elastic Properties Of Superconductors And Materials With Weakly Correlated Spins, Christian Binek

Christian Binek Publications

It is shown that in the ergodic regime, the temperature dependence of Young’s modulus is solely determined by the magnetic properties of a material. For the large class of materials with paramagnetic or diamagnetic response, simple functional forms of the temperature derivative of Young’s modulus are derived and compared with experimental data and empirical results. Superconducting materials in the Meissner phase are ideal diamagnets. As such, they display remarkable elastic properties. Constant diamagnetic susceptibility gives rise to a temperature independent elastic modulus for ceramic and single crystalline superconductors alike. The thermodynamic approach established in this report, paves the way to …

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Solvent Based 3d Printing Of Biopolymer/Bioactive Glass Composite And Hydrogel For Tissue Engineering Applications, Krishna Kolan, Yong Liu, Jakeb Baldridge, Caroline Murphy, Julie A. Semon, D. E. Day, Ming-Chuan Leu Jul 2017

Solvent Based 3d Printing Of Biopolymer/Bioactive Glass Composite And Hydrogel For Tissue Engineering Applications, Krishna Kolan, Yong Liu, Jakeb Baldridge, Caroline Murphy, Julie A. Semon, D. E. Day, Ming-Chuan Leu

Biological Sciences Faculty Research & Creative Works

Three-dimensional (3D) bioprinting is an emerging technology in which scaffolding materials and cell-laden hydrogels may be deposited in a pre-determined fashion to create 3D porous constructs. A major challenge in 3D bioprinting is the slow degradation of melt deposited biopolymer. In this paper, we describe a new method for printing poly-caprolactone (PCL)/bioactive borate glass composite as a scaffolding material and Pluronic F127 hydrogel as a cell suspension medium. Bioactive borate glass was added to a mixture of PCL and organic solvent to make an extrudable paste using one syringe while hydrogel was extruded and deposited in between the PCL/borate glass …

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A Study In The Use Of Elastic Materials In Expandable Containment Units, Andrew J. Eisenman, Joby Anthony Iii, David Satagaj Jun 2017

A Study In The Use Of Elastic Materials In Expandable Containment Units, Andrew J. Eisenman, Joby Anthony Iii, David Satagaj

Montview Journal of Research & Scholarship

The rigidity of materials in conjunction with the aspect of elasticity has been a concern of modern technologies and construction in recent centuries because of the advantages that expandable storage would bring to the fields of containment units with respect to population growth and space exploration. The world population is currently growing at an exponential rate, and as our population grows, the more important it will become to have containment units that can both contain large volumes of material as well as minuscule amounts of material without wasting space. In order accomplish this, we will need a new type of …

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Wastewater Treatment Process Based On Microbial Electrochemistry: Opportunities And Challenges, Wei-Hua He, Jia Liu, Hai-Man Wang, Yu-Jie Feng Jun 2017

Wastewater Treatment Process Based On Microbial Electrochemistry: Opportunities And Challenges, Wei-Hua He, Jia Liu, Hai-Man Wang, Yu-Jie Feng

Journal of Electrochemistry

Microbial electrochemical technology (MET) has drawn great attention for its characteristics of synergetic pollution removal and energy recovery of wastewater. In the last decade, significant developments in microbial electrochemical system (MES) have been made in the aspects of electron transfer mechanism, microbial community analysis, function expansion, low-cost electrode materials and scaled-up constructions. However, the feasibility of MET as a wastewater treatment process has been controversial so far. In this paper, the characteristics of MET were systematically compared with anaerobic and aerobic processes from the application point of view in the aspects of pollution degradation and energy recovery processes. The MET-based …

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Ionic Liquid-Supported Tempo/Polymeric Ionic-Liquid/Carbon Black Ternary Composites: Preparations And Applications In Electrochemical Oxidation Of Alcohols, Xin Lin, Cao-Cao Sun, Zhi-Rong Liu, Cheng-Chu Zeng Jun 2017

Ionic Liquid-Supported Tempo/Polymeric Ionic-Liquid/Carbon Black Ternary Composites: Preparations And Applications In Electrochemical Oxidation Of Alcohols, Xin Lin, Cao-Cao Sun, Zhi-Rong Liu, Cheng-Chu Zeng

Journal of Electrochemistry

To effectively recover redox catalyst and supporting electrolyte, a novel ternary composite consisting of ionic liquid-supported TEMPO, polymeric ionic-liquid and carbon black was prepared. The ionic-liquid supported redox catalyst TEMPO-IL-BF4 was firstly synthesized from 4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl, and followed by the reaction of polydimethyldiallylammonium chloride (PDDA) and bis(trifluoromethane)sulfonimide lithium salt (LiTFSI) to form poly[diallyldimethylammonium bis(trifluoromethanesulfonyl)imide] (PDDA(Tf2N)). A combination of the above mentioned two synthesized materials and carbon black afforded to obtain the ternary composite, which was used as the recoverable supporting electrolyte and mediator for the electrochemical oxidation of alcohol. The results indicate that various alcohols could be oxidized …

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Electrochemical Synthesis Of Homoallylic Alcohols And Homoallylic Amines, Wei-Qiang Zhong, Xiang-Hui Liang, Jing-Mei Huang Jun 2017

Electrochemical Synthesis Of Homoallylic Alcohols And Homoallylic Amines, Wei-Qiang Zhong, Xiang-Hui Liang, Jing-Mei Huang

Journal of Electrochemistry

Electrochemical technique has been widely applied in the organic synthesis. This review focuses on the electrochemical synthesis of homoallylic alcohols and homoallylic amines from the allylation of carbonyl compounds and imines. This method has been developed impressively, especially in the field of electrochemical allylation in a green solvent of aqueous media. Improvement of the efficiency of the electricity, regio-selectivity and chiral synthesis are expected.

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Preparations And Applications Of Irsnox Electrode In Electrochemical Synthesis Of 2,5-Dichlorophenol, Xiang-Yu Ma, Xu-Guo Tu, Rui-Nan He, Ya Chen, Gui-Sheng Zhu, Shou-Yan Shao, Song Chen Jun 2017

Preparations And Applications Of Irsnox Electrode In Electrochemical Synthesis Of 2,5-Dichlorophenol, Xiang-Yu Ma, Xu-Guo Tu, Rui-Nan He, Ya Chen, Gui-Sheng Zhu, Shou-Yan Shao, Song Chen

Journal of Electrochemistry

The electrodes of titanium based iridium tin oxides (IrSnOx) have been prepared by traditional thermal decomposition method and further applied to the electrosynthsis of 2,5-dichlorophenol in order to explore a green and high efficient synthesis route. The results showed that the electrode surface existed apparent cracks, while the intermediate layer prepared with Sn:Sb=94:6 existed less cracks and longer life time. The main products of the electrolytic reaction were 2,5-dichlorophenol, p-chlorophenol, and 1,2,4-trichlorobenzene. The electrosynthsis yield of 2,5-dichlorophenol reached 57% and the selectivity of 2,5-dichlorophenol was as high as 93% by using the IrSnOx as an anode, which is obviously better …

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Electrocatalysis Of Nanotin Dioxide In The Battery Reaction Of Zinc-Nitrobenzene, Xu-Guo Tu, Xiang-Yu Ma, Rui-Nan He, Xiao-Juan Wang, Chen Ling, Yun-Xia Sun, Song Chen Jun 2017

Electrocatalysis Of Nanotin Dioxide In The Battery Reaction Of Zinc-Nitrobenzene, Xu-Guo Tu, Xiang-Yu Ma, Rui-Nan He, Xiao-Juan Wang, Chen Ling, Yun-Xia Sun, Song Chen

Journal of Electrochemistry

The tin dioxide (SnO2) nanoparticles were synthesized by using a simple hydrothermal route in the presence of tetrapropyl ammonium bromide (TPAB) as a surfactant. Accordingly, the titanium mesh based SnO2 catalyst electrode was prepared. The morphologies and structures of SnO2 nanostructures were characterized by scanning electron microscopy and X-ray diffraction spectrometry. The influences of reactant concentration, reaction temperature and time on the morphology of the products were investigated in detail. The electrocatalytic performance of SnO2 for the reduction of nitrobenzene with zinc was studied. Possible formation process and growth mechanism for such hierarchical SnO2 …

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Selective Direct Electro-Oxidation Of C-H Bond, Yan-Mei Liao, Qian-Qian Wu, An-Lun Zhang, Ying-Hong Zhu, Chun-An Ma Jun 2017

Selective Direct Electro-Oxidation Of C-H Bond, Yan-Mei Liao, Qian-Qian Wu, An-Lun Zhang, Ying-Hong Zhu, Chun-An Ma

Journal of Electrochemistry

Carbon-hydrogen (C-H) bond is the most basic chemical bond in organic compounds. The activation and direct conversion of C-H bond are the effective methodology for synthesis of different kinds of organic compounds from alkane compounds. The oxidative activation and functionalization of C-H bonds constitute an important and challenging area of investigation. The electro-oxidative activation of C-H bonds to form new C-O, C-C and C-N bonds has proven to be interesting and important in organic chemistry using the clean electron as the oxidant. The target C-O, C-C and C-N compounds could be selectively achieved by choosing the appropriate electrode, supporting electrolyte …

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Electrocarboxylation: An Effective Process For Fixation Of Co2 Into Organic Carboxylic Acids, Huan Wang, Jia-Xing Lu Jun 2017

Electrocarboxylation: An Effective Process For Fixation Of Co2 Into Organic Carboxylic Acids, Huan Wang, Jia-Xing Lu

Journal of Electrochemistry

Conversion and utilization of greenhouse gas carbon dioxide (CO2) have become more and more significant to the sustainable development of the global economy. Among them, electrocarboxylation of organic substrates is an effective process. Under mild conditions such as ambient temperature and pressure, carbocations generated by electroreduction of organic substrates can react with CO2 into corresponding carboxylic acids. This paper introduces the recent progress of our group in electrochemical carboxylation, including electrocarboxylation of varies active organic substrates and asymmetric electrocarboxylation.

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Electrochemical Deposition Of Cr From Cr3+ In The Mixed Electrolyte Of [Bmim]Oac/H2O, Wei Luo, Dong-Fang Niu, Rong-Bin Du, Jun-Wei Wang, Zhu-Qing Wang, Heng Xu, Xin-Sheng Zhang Jun 2017

Electrochemical Deposition Of Cr From Cr3+ In The Mixed Electrolyte Of [Bmim]Oac/H2O, Wei Luo, Dong-Fang Niu, Rong-Bin Du, Jun-Wei Wang, Zhu-Qing Wang, Heng Xu, Xin-Sheng Zhang

Journal of Electrochemistry

The electrochemical reduction of trivalent chromium ion (Cr3+) to Cr in 1-butyl-3-methylimidazolium acetate ([BMIM]OAc)-H2O mixed electrolyte was investigated. The cyclic voltammograms showed that the electroreduction of Cr3+ in the mixed electrolyte occurred in a two-step process, namely, Cr3+ + e → Cr2+ and Cr2+ + 2e→ Cr0, controlled by the diffusion of Cr3+ to the electrode. The diffusion coefficient of Cr3+ was 1.2×10-8 cm2/s at 40 ℃ obtained by Rendle-Sevcik equation. The chronoamperomograms of the Cr3+ electrodeposition confirmed the three-dimensional instantaneous nucleation mechanism of …

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Preparations And Characterizations Of Ti/Pbo2 Electrodes Modified With Rare Earth Of Praseodymium And Pvp In Electrochemical Degradation Of Organics, Mai Xu, Feng-Wu Wang, Xian Liang, Yi-Jun Wei, Wen-Yan Fang, Chuan-Gao Zhu, Yun-Hu Hun Jun 2017

Preparations And Characterizations Of Ti/Pbo2 Electrodes Modified With Rare Earth Of Praseodymium And Pvp In Electrochemical Degradation Of Organics, Mai Xu, Feng-Wu Wang, Xian Liang, Yi-Jun Wei, Wen-Yan Fang, Chuan-Gao Zhu, Yun-Hu Hun

Journal of Electrochemistry

The titanium (Ti) based lead oxide (PbO2) electrodes doped with praseodymium oxide (Pr2O3) and polyvinylpyrrolidone (PVP) were prepared by electrodeposition. The surface morphologies and structures of the as-prepared thin films were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) technique, respectively. The results showed that the denser and more uniform coatings with smaller particles and larger surfaces were obtained by doping, which modified the micro-structure of the Ti/SnO2-Sb2O3/Pr2O3-PVP-PbO2 electrode. Cyclic voltammetry (CV) was also used to study the electrocatalytic activity of …

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Listening And Negotiation Ii, Adjo A. Amekudzi-Kennedy, Kevin D. Hall, Trevor Scott Harding, Amy J. Moll, Janet Callahan Jun 2017

Listening And Negotiation Ii, Adjo A. Amekudzi-Kennedy, Kevin D. Hall, Trevor Scott Harding, Amy J. Moll, Janet Callahan

Materials Science and Engineering Faculty Publications and Presentations

This paper is based on a panel held in June, 2017 in Columbus, Ohio, jointly sponsored by the Women in Engineering Division and by the Minorities in Engineering Division. It is focused on negotiation, with an emphasis on providing practical strategies that are relevant in an academic setting. The panel featured academic leaders at multiple levels, including professor, chair and dean, from diverse engineering institutions, ranging from teaching-centric to heavily research-focused. Panelists discussed strategies for negotiation, with an emphasis on an approach that meets the interests of both parties to the extent possible. The panel was administrated with an opening …

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Establishing Doctoral Programs In Electrical Engineering, Materials Science And Engineering, And Computing In An Emerging Research Institution: Lessons Learned And Best Practices, Janet Callahan, Cheryl B. Schrader, Darryl P. Butt, Timothy Anderson, Tammi Vacha-Hasse, Amy J. Moll Jun 2017

Establishing Doctoral Programs In Electrical Engineering, Materials Science And Engineering, And Computing In An Emerging Research Institution: Lessons Learned And Best Practices, Janet Callahan, Cheryl B. Schrader, Darryl P. Butt, Timothy Anderson, Tammi Vacha-Hasse, Amy J. Moll

Materials Science and Engineering Faculty Publications and Presentations

Over the past decade, three doctoral programs have been launched at Boise State University. The first doctoral program established was in Electrical and Computer Engineering, selected because of the need for a trained workforce in the region. The other two doctoral programs, Materials Science and Engineering, and Computing, were from the start designed as interdisciplinary degree programs. That is, they were designed for the participation of not just program faculty within the division, but for the participation of program faculty with related research interests in other departments at the university. This paper presents the steps taken to launch the programs, …

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Vertically Integrated Projects (Vip) Programs: Multidisciplinary Projects With Homes In Any Discipline, Jocelyn B. S. Cullers, William L. Hughes, Donna C. Llewellyn Jun 2017

Vertically Integrated Projects (Vip) Programs: Multidisciplinary Projects With Homes In Any Discipline, Jocelyn B. S. Cullers, William L. Hughes, Donna C. Llewellyn

Materials Science and Engineering Faculty Publications and Presentations

A survey of papers in the ASEE Multidisciplinary Engineering Division over the last three years shows three main areas of emphasis: individual courses; profiles of specific projects; and capstone design courses. However, propagating multidisciplinary education across the vast majority of disciplines offered at educational institutions with varying missions requires models that are independent of the disciplines, programs, and institutions in which they were originally conceived. Further, models that can propagate must be cost effective, scalable, and engage and benefit participating faculty. Since 2015, a consortium of twenty-four institutions has come together around one such model, the Vertically Integrated Projects (VIP) …

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Ten Years Later: Where Are They Now?, Janet Callahan, Donna C. Llewellyn, Vicki Stieha, Ann E. Delaney Jun 2017

Ten Years Later: Where Are They Now?, Janet Callahan, Donna C. Llewellyn, Vicki Stieha, Ann E. Delaney

Materials Science and Engineering Faculty Publications and Presentations

This paper explores the educational and career trajectories of the alumnae of an outreach activity for girls. The outreach activity was originally developed using an integrated marketing approach to attract girls into engineering programs.1 The program, a two day, overnight experience for rising 9th, 10th and 11th grade girls, focuses on showcasing engineering as an exciting, creative activity, including activities developed from that perspective. Started in 2005 and held annually since then, a total of over 500 girls have participated, with approximately 85% of them coming from Boise State University’s immediate metropolitan area. Facilitated by …

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Symmetry Driven Control Of Optical Properties In Wo3 Films, Andreas Herklotz, Stefania Rus, Santosh Kc, Valentino Cooper, Amanda Huon, Er-Jia Guo, Thomas Ward Jun 2017

Symmetry Driven Control Of Optical Properties In Wo3 Films, Andreas Herklotz, Stefania Rus, Santosh Kc, Valentino Cooper, Amanda Huon, Er-Jia Guo, Thomas Ward

Faculty Publications

In this work, we demonstrate that the optical bandgap of WO3 films can be continuouslycontrolled through uniaxial strain induced by low-energy helium implantation.The insertion of He into epitaxially grown and coherently strained WO3 films canbe used to induce single axis out-of-plane lattice expansion of up to 2%. Ellipsometricspectroscopy reveals that the optical bandgap is reduced by about 0.18 eVper percent expansion of the out-of-plane unit cell length. Density functional theorycalculations show that this response is a direct result of changes in orbital degeneracydriven by changes in the octahedral rotations and tilts.

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