The Effects Of Atmospheric Heat Treatments On Tio2 Nanotube Anodes For Lithium-Ion Batteries,
2018
Boise State University
The Effects Of Atmospheric Heat Treatments On Tio2 Nanotube Anodes For Lithium-Ion Batteries, Andreas Savva
Boise State University Theses and Dissertations
The effects of various heat treatments on the physical and electrochemical properties of anatase TiO2 nanotubes were studied in this work. Well-ordered TiO2 nanotubes were grown via electrochemical anodization and annealed at 450°C to induce a phase transformation to anatase. The heat treatments were conducted under atmospheres of O2, Ar, N2, and water vapor (WV) to create different point defects. The oxygen-deficient atmospheres were used to generate oxygen vacancies in the TiO2 nanotubes, while the water vapor treatment was used to create Ti vacancies by stabilizing them via the protonation of O sites. …
Irradiation Effects On Titanium Dioxide Electrodes For Lithium Ion Batteries,
2018
Boise State University
Irradiation Effects On Titanium Dioxide Electrodes For Lithium Ion Batteries, Kassiopeia Ann Smith
Boise State University Theses and Dissertations
This dissertation presents the mechanisms of irradiation induced defects and the resulting electrochemical response of TiO2 anode for lithium-ion-batteries. The objective is to realize pathways by which irradiation could be used to enhance the energy density of rechargeable lithium ion batteries in order to provide power to applications under extreme environments. Recent studies suggest that the presence of structural defects (e.g. vacancies and interstitials) in metal oxides may enhance the electrochemical charge storage capacity in electrode materials. One approach to induce defect formation in electrode materials is to use ion irradiation, which has been proven to produce point …
Improving And Augmenting The Anm Model For Three-Dimensional Virtual Concrete,
2018
Boise State University
Improving And Augmenting The Anm Model For Three-Dimensional Virtual Concrete, Stephen Thomas
Boise State University Theses and Dissertations
The Anm model used for creating virtual concrete consisting of irregular shapes has been improved by integrating two existing algorithms: the extent overlap box (EOB) method for detecting contact between two irregular shapes and the uniform thickness shell algorithm. The EOB method has been compared with the previously used Newton-Raphson method and shown to be able to detect inter-particle contact with better accuracy and with less computational cost. Two parameters that define the balance between accuracy and performance of the EOB method have been identified and studied. The uniform thickness shell has been used to specify the minimum inter-particle distance …
Electrocatalytic Properties Of Ni-Fe Basedalloys Toward Oxygen Evolution Reaction,
2018
Louisiana State University and Agricultural and Mechanical College
Electrocatalytic Properties Of Ni-Fe Basedalloys Toward Oxygen Evolution Reaction, Xiaodan Cui
LSU Doctoral Dissertations
In this dissertation, laser-based manufacturing was applied to develop NiFe-based alloys, with focus on their electrochemical characteristics toward oxygen evolution reaction during water electrocatalysis. The targeted electrocatalysts were designed by combining catalysis principles of absorption energy, electronic effect and geometry effect. Firstly, a one-step laser-based manufacturing method was applied to prepare a thin layer of NiFe-based electrodes with varied Ni to Fe ratios to replace high-cost noble metals as the electrocatalyst for oxygen evolution reaction (OER). Since each Ni has 0.6 d-vacancy and each Fe atom has 2.2 d-vacancies. The alloying of Ni-Fe allows electrons flowing from Ni to Fe, …
Damage Simulation Of Pre-Forming V-Neck Plates With Variations In Material Type, Time And Temperature Using The Taguchi Method,
2018
Department of Mechanical Engineering, Faculty of Engineering, Malang State University
Damage Simulation Of Pre-Forming V-Neck Plates With Variations In Material Type, Time And Temperature Using The Taguchi Method, Avita Ayu Permanasari, Rr. Poppy Puspitasari, Kevin Valiant Cahya, Mahfud Ihsan
Journal of Mechanical Engineering Science and Technology (JMEST)
In metal forming, damage can be caused by several factors: load on the workpiece, initial heating temperature, and temperature due to the friction between the die and the material for pre-forming. The metal forming process can be executed in 2 ways, namely by hot working and cold working. During these two types of mechanical working process, the metal undergoes plastic deformation. In hot working, the required deformation force is relatively low, and changes in mechanical properties are also insignificant. In cold working, a higher force is required, but the strength of the metal will increase significantly. The use of simulation …
Mechanical Properties And Permeability Of Sand Casting Moulds With Eggshells Binder,
2018
Physics Department, Isfahan University of Technology, Iran
Mechanical Properties And Permeability Of Sand Casting Moulds With Eggshells Binder, Maryam Sharifi Jebeli Sharifi Jebeli, Wahyu Kurnianto, Wahono Wahono
Journal of Mechanical Engineering Science and Technology (JMEST)
This research aimed to analyse whether or not eggshell could be a potential addition to sand mould composition as a binding material together with bentonite. Different amounts of eggshell material, i.e. 4%, 7%, 10% and 3%, were added to each sample. This study was a type of pre-experimental design called the one-shot case study. Among all sand moulds under study, sample 3 10% ES in dry conditions had the highest tensile, compressive and shear strengths of 0.09 Kg/cm2, 3.11 Kg/cm2 and 1.13 Kg/cm2, respectively. The results of the permeability test with heat treatment at 110˚C for 60 minutes showed that …
Pine Flower Waste Innovation As A Plant Based Program Augmented Reality,
2018
Bachelor Program, Mechanical Engineering Department, Universitas Negeri Malang
Pine Flower Waste Innovation As A Plant Based Program Augmented Reality, Ayik Bela Saputra, Imam Muhtarom, Ni’Matul Rochmaniyah, Ardhana Iswari Citra Padmi, Ika Rahmawati
Journal of Mechanical Engineering Science and Technology (JMEST)
Indonesia one of the tropical countries in the world can not be separated from environment problems like other developing countries. One of the causes of declining environment quality is the decline of forests in Indonesia. In 2009, Indonesia’s forest area was by more than half, to about 88 million hectares. By the year 2013 the number is about 82 million hectares. One of the efforts to promote environment education is to familiarize planting plants to children from an early age from the school environment to the family environment. Therefore it is necessary an alternative in the form of planting media …
Properties Of Cassava Starch Based Bioplastic Reinforced By Nanoclay,
2018
Environmentalist, Samarinda, Kalimantan Timur, Indonesia; Department of Mechanical Engineering, Faculty of Engineering, Universitas Negeri Malang
Properties Of Cassava Starch Based Bioplastic Reinforced By Nanoclay, Nanang Eko Wahyuningtiyas, Heru Suryanto
Journal of Mechanical Engineering Science and Technology (JMEST)
Synthetic Synthetic plastic is chemical materials which cause severe environmental problems. Incinerating plastic waste leads to release of hazardous gases, which is not good for humans. Bioplastic can help reduce the dependence on fossil fuels and petroleum, that bioplastic can solve the problem of synthetic plastic use. This research aims to define the properties of the cassava starch-based bioplastic reinforced by nanoclay. Methods were experimental with bioplastic component of cassava starch, glycerol as plasticizer and nanoclay as reinforcement. The bioplastic was analyzed using XRD, tensile test, moisture absorption, biodegradability, and compared with another bioplastic. The results show that the addition …
Effect Of Mnfe2o4 Nanoparticles To Reduce Co And Hc Levels On Vehicle Exhaust Gas Emissions,
2018
Department of Mechanical Engineering, Faculty of Engineering, Universitas Negeri Malang; Center of Nano Research and Advanced Materials, Universitas Negeri Malang
Effect Of Mnfe2o4 Nanoparticles To Reduce Co And Hc Levels On Vehicle Exhaust Gas Emissions, Poppy Puspitasari, Sukarni Sukarni, Amir Hamzah
Journal of Mechanical Engineering Science and Technology (JMEST)
The air pollution particle emitted from transportation in Indonesia Bay 2015 consist of 70.50% CO; 18.34% HC; 8.89% NOx; 0.88% SOx; 1.33%. These gases are very harmful to humans. To reduce the toxic gas effect, special treatment is needed, one of them is by applying catalyst on exhaust system. MnFe2O4 has the potential to bind the CO and HC elements contained in the exhaust gas. This study aims to investigate the effect of MnFe2O4 addition on catalityc converter towards CO gas and HC emissions of motor vehicles. Therefore, the percentage of exhaust reduction with and without applying MnFe2O4 on varied …
The Effect Of Rotational Speed, Friction Duration, And Pressure On Tensile Strength Of Aisi 6061 Welding Joints,
2018
Mechanical Engineering Department, Faculty of Engineering, University Technology Petronas, Malaysia
The Effect Of Rotational Speed, Friction Duration, And Pressure On Tensile Strength Of Aisi 6061 Welding Joints, Dewi Puspitasari, Poppy Puspitasari, M. Rizka Gita Firmansyah, Solichin Solichin
Journal of Mechanical Engineering Science and Technology (JMEST)
Electric arc welding with covered electrodes is ideally suited for flat plates. If this technique is employed for welding rigid bodies, the results would be of poor quality. One viable solution to weld rigid bodies is through friction welding. The study aimed to investigate the tensile strength of specimens subjected to friction welding with variations in rotational speed, friction time, and pressure and to examine the microstructure of friction welding joints. This research used the one-shot case study design and involved descriptive analysis. The descriptive analysis described the results of tensile testing and microstructure of welding joints. Results showed that …
59th Annual Rocky Mountain Conference On Magnetic Resonance,
2018
University of Denver
59th Annual Rocky Mountain Conference On Magnetic Resonance
Rocky Mountain Conference on Magnetic Resonance
Final program, abstracts, and information about the 59th annual meeting of the Rocky Mountain Conference on Magnetic Resonance, co-endorsed by the Colorado Section of the American Chemical Society and the Society for Applied Spectroscopy. Held in Snowbird, Utah, July 22-27, 2018.
A Rheometry Method To Assess The Evaporation-Induced Mechanical Strength Development Of Polymer Solutions Used For Membrane Applications,
2018
Purdue University
A Rheometry Method To Assess The Evaporation-Induced Mechanical Strength Development Of Polymer Solutions Used For Membrane Applications, Eduard Caicedo Casso, Jessica L Sargent, Rachel M. Dorin, Ulrich B. Wiesner, William A. Phillip, Bryan M. Boudouris, Kendra Erk
School of Materials Engineering Faculty Publications
Rotational and oscillatory shear rheometry were used to quantify the flow behavior under minimal and significant solvent evaporation conditions for polymer solutions used to fabricate isoporous asymmetric membranes by the self-assembly and non-solvent induced phase separation (SNIPS) method. Three different A-B-C triblock terpolymer chemistries of similar molar mass were evaluated: polyisoprene-^-polystyrene-6-poly(4-vinylpyridine) (ISV); polyisoprene-6- polystyrene-6-poly(V,A-dimethylacrylamide) (ISD); and polyisoprene-Z>-polystyrene-h-poly(fer/- butyl methacrylate) (ISB). Solvent evaporation resulted in the formation of a viscoelastic film typical of asymmetric membranes. Solution viscosity and film viscoelasticity were strongly dependent on the chemical structure of the triblock terpolymer molecules. A hierarchical magnitude (ISV>ISB>ISD) was observed …
Design Of Lattice Structures With Graded Density Fabricated By Additive Manufacturing,
2018
Missouri University of Science and Technology
Design Of Lattice Structures With Graded Density Fabricated By Additive Manufacturing, Wenjin Tao, Yong Liu, Austin T. Sutton, Krishna C. R. Kolan, Ming-Chuan Leu
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Lattice structures fabricated by Additive Manufacturing (AM) processes are promising for many applications, such as lightweight structures and energy absorbers. However, predicting and controlling of their mechanical behaviors is challenging due to the complexity of modeling and the uncertainties exist in the manufacturing process. In this paper, we explore the possibilities enabled by controlling the local densities. A set of lattice structures with different density gradients are designed using an implicit isosurface equation, and they are manufactured by Selective Laser Melting (SLM) process with 304L stainless steel. Finite element analysis and compression test are used to evaluate their mechanical properties. …
Tunable Plasmonic Resonances In Highly Porous
Nano-Bamboo Si-Au Superlattice-Type Thin Films,
2018
University of Nebraska-Lincoln
Tunable Plasmonic Resonances In Highly Porous Nano-Bamboo Si-Au Superlattice-Type Thin Films, Ufuk Kılıç, Alyssa Mock, René Feder, Derek Sekora, Matthew J. Hilfiker, Rafal Korlacki, Eva Schubert, Christos Argyropoulos, Mathias Schubert
Department of Electrical and Computer Engineering: Faculty Publications
We report on fabrication of spatially-coherent columnar plasmonic nanostructure superlattice-type thin films with high porosity and strong optical anisotropy using glancing angle deposition. Subsequent and repeated depositions of silicon and gold lead to nanometer-dimension subcolumns with controlled lengths. The superlattice-type columns resemble bamboo structures where smaller column sections of gold form junctions sandwiched between larger silicon column sections (“nano-bamboo”). We perform generalized spectroscopic ellipsometry measurements and finite element method computations to elucidate the strongly anisotropic optical properties of the highly-porous nano-bamboo structures. The occurrence of a strongly localized plasmonic mode with displacement pattern reminiscent of a dark quadrupole mode is …
Synthesis And Characterization Of Polyaniline Agglomerates And Polyaniline Nanoparticles To Use As Printed Sensors To Detect Spoilage Of Catfish During Refrigerated Storage,
2018
Louisiana State University and Agricultural and Mechanical College
Synthesis And Characterization Of Polyaniline Agglomerates And Polyaniline Nanoparticles To Use As Printed Sensors To Detect Spoilage Of Catfish During Refrigerated Storage, Vashti Martae Campbell
LSU Master's Theses
There is growing interest in the development of sensors contained in packaging for seafood that are applicable at the consumer level to monitor freshness in a non-destructive manner. Total volatile basic nitrogen (TVB-N) analysis indicates the freshness of seafood. TVB-N analysis is sensitive to the spoilage compounds comprised of ammonia, trimethylamine, dimethylamine, and biogenic amines commonly found in seafood and whose concentration increases when spoilage microbial growth occurs. However, TVB-N analysis is laborious and is not suitable for use at the consumer level. Polyaniline (PANI) is a polymer that may be used as a sensor for detecting TVB-N in seafood. …
The Effect Of Processing Conditions On The Energetic Diagram Of Cdte Thin Films Studied By Photoluminescence,
2018
University of South Florida
The Effect Of Processing Conditions On The Energetic Diagram Of Cdte Thin Films Studied By Photoluminescence, Shamara P. Collins
USF Tampa Graduate Theses and Dissertations
The photovoltaic properties of CdTe-based thin films depend on recombination levels formed in the CdTe layer and at the heterojunction. The localized states are resultant of structural defects (metal sublattice, chalcogen sublattice, interstitial), controlled doping, deposition process, and/or post-deposition annealing. The photoluminescence study of CdTe thin films, from both the bulk and heterojunction, can reveal radiative states due to different defects or impurities. Identification of defects allows for potential explanation of their roles and influence on solar cell performance. A thorough understanding of the material properties responsible for solar cell performance is critical in further advancing the efficiency of devices. …
Properties Of Matter,
2018
University of Arkansas, Fayetteville
Properties Of Matter, Mike Jackson, Holly Haney
High School Lesson Plans
Students will investigate the relationship(s) between thermal and electrical properties of matter. First, students will use a multimeter and temperature probe to investigate the relationship between electrical resistance and temperature of an electrical resistor composed of metals. They will then graph collected data to analyze the relationship and draw a conclusion as to their relationship. They will then perform the same investigation on a thermal resistor made of a semiconducting substance and analyze that collected data. Finally, using ClaimEvidence-Reasoning (CER) structure, students will use their experimental evidence to state the similarities and differences between the electro-thermal properties of metals and …
Molecular Assembly Of Monolayer-Protected Gold Nanoparticles And Their Chemical, Thermal, And Ultrasonic Stabilities,
2018
Western Kentucky University
Molecular Assembly Of Monolayer-Protected Gold Nanoparticles And Their Chemical, Thermal, And Ultrasonic Stabilities, Steven Ray Isaacs
Masters Theses & Specialist Projects
Gold monolayer-protected nanoclusters (MPCs) with average diameters of 1-5 nm protected by alkane- and arenethiolates were synthesized. Mixed-monolayer protected nanoparticles (MMPCs) were prepared by functionalizing hexanethiolate-protected MPCs with either 11-mercaptoundecanoic acid (MUA-MMPC), 11-mercaptoundecanol (MUO-MMPC), or 4-aminothiophenol (ATP-MMPC) using ligand place exchange. Presentation of various chemical reagents such as nucleophile, acid, or base and change in physical environment through ultrasonic and thermal irradiation resulted in changes to particles and their physical properties. Thermogravimetric analysis (TGA) was used to measure maximum temperature of the derivated thermogravimetric peaks (Tmax,DTG) as a means of comparing temperature dependence of mass loss. The absorption spectrum within …
Structural Transformations In Porous Glasses Under Mechanical Loading. I. Tension,
2018
Wright State University - Main Campus
Structural Transformations In Porous Glasses Under Mechanical Loading. I. Tension, Nikolai V. Priezjev, Maxim A. Makeev
Mechanical and Materials Engineering Faculty Publications
The evolution of porous structure and mechanical properties of binary glasses under tensile loading were examined using molecular dynamics simulations. We consider vitreous systems obtained in the process of phase separation after a rapid isochoric quench of a glass-forming liquid to a temperature below the glass transition. The porous structure in undeformed samples varies from a connected porous network to a random distribution of isolated pores upon increasing average glass density. We find that at small strain, the elastic modulus follows a power-law dependence on the average glass density and the pore size distribution remains nearly the same as in …
Material Properties Of Laser Powder Bed Fusion Processed 316l Stainless Steel,
2018
Montana Tech
Material Properties Of Laser Powder Bed Fusion Processed 316l Stainless Steel, Steven Keckler
Graduate Theses & Non-Theses
Laser powder bed fusion additive manufactured 316L stainless steel specimens were evaluated to establish a baseline for future research in determining an optimized energy density and build orientation. Test specimens were printed at various energy densities. At each energy density, tensile and fatigue specimens were printed at 0o (longitudinal), 45o, and 90o (transverse) orientation to the build plate. Tensile and high cycle fatigue tests were performed then representative fracture surfaces were analyzed. The apparent melt track and dendrite size were evaluated using grain analysis software. Static loading of the tensile specimens showed a marginal difference in UTS for specimens with …
