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Articles 61 - 90 of 244

Full-Text Articles in Materials Science and Engineering

Synthesis And Characterization Of Cobalt-Based Magnetic Nanostructures, Jacob Elkins Aug 2020

Synthesis And Characterization Of Cobalt-Based Magnetic Nanostructures, Jacob Elkins

Material Science and Engineering Theses - Archive

Co is an attractive element in the development of nanostructured magnetic materials due to its relatively high moment (1.72-1.75 µB) and strong exchange and spin-orbit interactions, and many of these materials have potential in applications such as data recording media, hyperthermia treatments, and nanostructured permanent magnets. In this thesis, magnetic nanostructures of CoFe2O4, Co, and CoNi with controlled size, shape, composition, and crystal structure are synthesized via bottom-up wet chemical methods and their magnetic properties are systematically characterized. Additionally, nanocomposites of exchange-coupled FeCo/CoFe2O4 and Co/FeCo core-shell nanostructures with enhanced magnetizations are prepared and investigated. In order to understand the prominent …

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Study Of Interdiffusion And Growth Of Intermetallic Compounds In Bimetallic Layers Of Alpha Brass And Al-Mg Alloy, Ratan Kota Aug 2020

Study Of Interdiffusion And Growth Of Intermetallic Compounds In Bimetallic Layers Of Alpha Brass And Al-Mg Alloy, Ratan Kota

Material Science and Engineering Theses - Archive

This work aims to study the formation of Inter Metallic Compounds (IMC’s) and their growth rate in Brass and Al-Mg alloy. This diffusion couple consists of four elements Aluminum, Copper, Zinc and Magnesium. Aluminum and Copper are major diffusing elements. Brass-Aluminum bimetal is an advanced structural material and used as a cladding material. This bimetal is produced by cold roll bonding and is mechanically bonded. To increase the adhesive strength of these bimetal layers, the sample is subjected to heat treatment which leads to the formation of Inter Metallic Compounds (IMC). Heat treatments are generally done above the recrystallization temperature …

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An Investigation On The Corrosion Inhibition Of Brazing Cu-Ag Alloy, Hooman Rahmani Aug 2020

An Investigation On The Corrosion Inhibition Of Brazing Cu-Ag Alloy, Hooman Rahmani

Material Science and Engineering Dissertations - Archive

Adsorption and inhibition behavior of 1,2,3-benzotriazole (BTA) and 2,5-dimercapto-1,3,4-thiadiazole (DMTD) on brazing Cu-Ag alloy was studied in deionized water using corrosion potential measurement, potentiodynamic polarization, adsorption isotherm investigation, X-ray photoelectron spectroscopy (XPS), and electrochemical impedance spectroscopy (EIS). Pure Ag and pure Cu specimens were included to investigate the mere effect each component has on the alloy’s behavior along with a high copper alloy for comparison purposes. The electrochemical responses show that BTA shifts the corrosion potential of Cu to the noble direction but has the opposite effect for Ag and a mixed behavior for the Cu-Ag alloys. However, DMTD in …

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Study Of New Transistor Architecture With Energy Filtering, Nnaemeka Mcdonald Eluagu Aug 2020

Study Of New Transistor Architecture With Energy Filtering, Nnaemeka Mcdonald Eluagu

Material Science and Engineering Theses - Archive

The thermodynamic limit of the subthreshold slope to 60mV/decade at 300K forces MOSFET devices to use high supply voltages (> 0.5V) and therefore dissipate a lot of energy. This physical limitation of transistors is a direct consequence of thermal excitation of electrons. This study investigates a new transistor architecture capable of suppressing thermally excited electrons using a quantum well as an energy filter. The energy filter consists of a 2nm SiO2 tunneling barrier and a 2nm Quantum Well (QW) layer of Cr2O3 sandwiched between Ni electrodes and a channel of Si. Transistors having this QW energy filter have been fabricated …

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Investigation Of High-Temperature Oxidation Resistance Mechanism Of Ceramic Coatings Via Microstructure Analysis, Yi Shen Aug 2020

Investigation Of High-Temperature Oxidation Resistance Mechanism Of Ceramic Coatings Via Microstructure Analysis, Yi Shen

Material Science and Engineering Dissertations - Archive

Recent developments of ceramic coatings deposited using magnetron reactive sputtering show that these films exhibited superior high-temperature oxidation resistance along with other desirable properties such as high hardness, optical transparency and good electrical conductivity. Detailed microstructure study of these films annealed to high temperatures using transmission electron microscopy (TEM) is deemed necessary as it provides an intuitive vision on the behavior of the materials at elevated temperature, which is essential to further improve their high-temperature oxidation resistance. In this study, Hf-B-Si-C-N films with various compositions that were annealed to various temperatures in both helium and air were subjected to detailed …

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Plasma Electrolytic Oxidation Of Titanium Under Constant Applied Voltage, Joshua Paul Twaddle May 2020

Plasma Electrolytic Oxidation Of Titanium Under Constant Applied Voltage, Joshua Paul Twaddle

Material Science and Engineering Theses - Archive

Plasma Electrolytic Oxidation (PEO) is a method capable of applying nonmetallic coatings to metallic substrates submerged in electrolyte via a plasma development under high voltage. The PEO technique is particularly useful in the coating of materials such as Ti-, Al-, and Mg-based alloys. In this study, the effects of varying processing voltage and time on oxide coating characteristics formed on pure titanium surfaces was investigated. First, it was necessary to prove that the selected electrolyte type and concentration could produce PEO coatings in a predictable fashion. Experiments were performed with constant current density by constantly controlling the voltage, so the …

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Single Step Fabrication Of Shape Morphing 3d Surfaces, Amirali Nojoomi May 2020

Single Step Fabrication Of Shape Morphing 3d Surfaces, Amirali Nojoomi

Material Science and Engineering Dissertations - Archive

Shape-changing materials that can adopt programmable 3-dimensional (3D) shapes offer promise for a wide range of applications. Form the formation of the leaves and flowers to the shaping of complex organs, the analogues of such shape-morphing 3D surfaces are abundant in nature. However, since the formation of such surfaces in biological systems is fundamentally different from that of human-made materials, replicating their complex morphologies, movements, and thereby functions remains a challenge. Inspired by living organisms, we introduce an approach, called digital light 4D printing (DL4P), that encodes thermosensitive 2D hydrogels with a specific pattern of network density and thus temperature-induced …

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Synthesis Of Nickel-Titanium Intermetallic Surface Coatings Via Electrolytic Plasma Processing, Brody Allen Moore May 2020

Synthesis Of Nickel-Titanium Intermetallic Surface Coatings Via Electrolytic Plasma Processing, Brody Allen Moore

Material Science and Engineering Theses - Archive

Electrolytic plasma processing (EPP) is an environmentally friendly surface cleaning and deposition technique. Dependant on circuit polarity, anionic or cationic species can be deposited from an aqueous electrolyte bridge, resulting in characteristic nanograin surface morphology and very high deposition rates. This work was conducted to study the EPP process, develop optimal parameters for the synthesis of very hard surface coatings, and study the resultant physical and electrochemical properties of produced titanium-nickel intermetallic surfaces. This study focuses on Ni deposited onto pure Ti surfaces for improvement of surface wear, hardness, and corrosion properties while retaining uncompromised Ti bulk characteristics. The surface …

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Performance Enhancement And Prediction Of Composite Materials With Embedded Electrospun Piezoelectric Sensors, Rahman Jani Mazed, Muthu Ram Prabhu Elenchezhian, Vamsee Vadlamudi, Md Riaz Uddin Ahmed, Rassel Raihan, Kenneth Reifsnider Jan 2020

Performance Enhancement And Prediction Of Composite Materials With Embedded Electrospun Piezoelectric Sensors, Rahman Jani Mazed, Muthu Ram Prabhu Elenchezhian, Vamsee Vadlamudi, Md Riaz Uddin Ahmed, Rassel Raihan, Kenneth Reifsnider

Institute of Predictive Performance Methodologies (IPPM-UTARI)-Archive

In today’s world, continuous fiber reinforced composite materials are extensively used in the aerospace, automotive and other structural industries. Since the applications of such fibers demand for a high safety rating, it is of utmost importance for engineers who design such materials to analyze its safety. When cracks are developed in such materials, the mechanical, electrical, and thermal properties also get altered as a function of the cracks. Previous studies have shown that changes in electrical properties can be directly correlated with the development of cracks in the material which can then be used to predict the remaining life of …

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6th Ic4n Book Of Abstracts, Efstathios Meletis, Constantin Politis, Wolfram Schommers, Nikolaos Kanellopoulos Jun 2019

6th Ic4n Book Of Abstracts, Efstathios Meletis, Constantin Politis, Wolfram Schommers, Nikolaos Kanellopoulos

International Conference from Nanoparticles and Nanomaterials to Nanodevices and Nanosystems - Archive

IC4N is a highly interdisciplinary conference focusing on all aspects of nanoscience and nanotechnology addressing global problems in energy, environment and human health. As in previous editions of this highly popular conference series, the overarching goal is to combine a high quality of scientific dialogue with a relaxing environment. This is a unique opportunity for both senior and junior researchers to meet, interact, and stimulate collaborations on a global scale. A number of Plenary, Keynote and invited lectures are planned by renowned scientists from all over the world, making IC4N an international nano forum of the highest quality.

Proceedings published …

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Investigation Of The Surface Topology Changes Associated With Fatigue, Randall D. Kelton May 2019

Investigation Of The Surface Topology Changes Associated With Fatigue, Randall D. Kelton

Material Science and Engineering Dissertations - Archive

Metals have long been known to change their surface topology when subjected to a plastic strain. Given that a plastic zone exists at the tip of a propagating crack, it would seem natural to quantitatively study surface topology changes associated with nucleating and propagating fatigue cracks. So far the workers in this study have only found one measurement of the surface topology changes associated with a nucleating crack. The current research seeks to study and refine, a possible correlation between crack growth and surface topology changes, with the object to develop a damage index for fatigue cracking from surface topology …

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Ultra-Small Gold Nanoparticles By Galvanic Replacement Of Larger Silver Nanoparticles, Chang Ting Lin May 2019

Ultra-Small Gold Nanoparticles By Galvanic Replacement Of Larger Silver Nanoparticles, Chang Ting Lin

Material Science and Engineering Theses - Archive

In the last two decades, Au nanoparticles have been extensively explored for their biomedical applications, which is mainly driven by their biocompatibility and special optical properties known as surface plasmon resonance (SPR) effect. A variety of Au nanoparticles with different sizes and shapes have been synthesized and tested both in vitro and in vivo. For in vivo applications, it is usually required that Au nanoparticles can be cleared through urine (renal clearance). Renal clearance is determined by several factors of Au nanoparticles, including size, shape and surface modification. In this thesis, for the purpose of using Au nanoparticles as carriers …

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Element-Specific Nanoparticle Placement Toward Fabricating Multi-Element Metastructures, Lei Wu May 2019

Element-Specific Nanoparticle Placement Toward Fabricating Multi-Element Metastructures, Lei Wu

Material Science and Engineering Theses - Archive

Nanoscale entities such as semiconductor nanoparticles, magnetic nanoparticles, metal nanoparticles, and dielectric nanoparticles have attracted a lot of attention due to their novel electrical, optical, and magnetic properties that their bulk materials cannot produce. These unique properties promise applications in nano-optical devices, ultra-sensitive sensors, single electron transistors, and high-density data storages. Moreover, to these captivating properties of the individual nanoparticles, it has been found that novel and scientifically important properties can be obtained when nanoparticles are arranged in specific configurations. Examples include nanoparticle dimers, hexamers, heptamers, and nanoparticle arrays. Until now, however, most studies have focused on one-element nanoparticle systems. …

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Structural Health Monitoring Of Fiber-Reinforced Composite Using Wireless Magnetostrictive Sensors, Sujjatul Islam, Relebohile George Qhobosheane, Muthu Ram Prabhu Elenchezhian, Vamsee Vadlamudi, Rassel Raihan, Kenneth Reifsnider Apr 2019

Structural Health Monitoring Of Fiber-Reinforced Composite Using Wireless Magnetostrictive Sensors, Sujjatul Islam, Relebohile George Qhobosheane, Muthu Ram Prabhu Elenchezhian, Vamsee Vadlamudi, Rassel Raihan, Kenneth Reifsnider

Institute of Predictive Performance Methodologies (IPPM-UTARI)-Archive

Composite materials are extending the horizons of designers in all branches of engineering. These materials have numerous advantages and improved structural properties such as high strength to weight ratio, high stiffness to weight ratio, lightweight, structural strength, and excellent durability. This has led to their use in several applications i.e. automobile, aircraft, and military defense devices. However, these materials experience various types of deformations and damage modes during their service life that are at times challenging to detect. This has led to the development of various non-destructive methods for structural health monitoring (SHM) of the damages in these complex material …

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5th Ic4n Book Of Abstracts, Efstathios Meletis, Nikolaos Kanellopoulos, Constantin Politis, Wolfram Schommers Mar 2019

5th Ic4n Book Of Abstracts, Efstathios Meletis, Nikolaos Kanellopoulos, Constantin Politis, Wolfram Schommers

International Conference from Nanoparticles and Nanomaterials to Nanodevices and Nanosystems - Archive

IC4N is a highly interdisciplinary conference focusing on all aspects of nanoscience and nanotechnology addressing global problems in energy, environment and human health. As in previous editions of this highly popular conference series, the overarching goal is to combine a high quality of scientific dialogue with a relaxing environment. This is a unique opportunity for both senior and junior researchers to meet, interact, and stimulate collaborations on a global scale. A number of Plenary, Keynote and invited lectures are planned by renowned scientists from all over the world, making IC4N an international nano forum of the highest quality.

Proceedings published …

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Damage Precursor Identification In Composite Laminates Using Data Driven Approach, Muthu Ram Prabhu Elenchezhian, Vamsee Vadlamudi, Rassel Raihan, Kenneth Reifsnider Jan 2019

Damage Precursor Identification In Composite Laminates Using Data Driven Approach, Muthu Ram Prabhu Elenchezhian, Vamsee Vadlamudi, Rassel Raihan, Kenneth Reifsnider

Institute of Predictive Performance Methodologies (IPPM-UTARI)-Archive

Composite materials are rapidly being used in commercial aviation and other day to day applications. The individual damage modes in composites are very well understood but it is the interaction of these local damage modes that leads to global failure. In the current research we intend to identify the damage precursors and the initiation of failure events in off axis unidirectional composite laminates loaded in quasi static uniaxial tension by measuring the dielectric response of the material by an in-situ technique using Broadband Dielectric Spectroscopy (BbDS). Using the variation of permittivity with strain, we are able to classify the stages …

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Design Of Embedded Wireless Sensors For Real-Time And In-Situ Strain Sensing Of Fiber Reinforced Composites, Relebohile George Qhobosheane, Sujjatul Islam, Muthu Ram Prabhu Elenchezhian, Vamsee Vadlamudi, Rassel Raihan, Kenneth Reifsnider Jan 2019

Design Of Embedded Wireless Sensors For Real-Time And In-Situ Strain Sensing Of Fiber Reinforced Composites, Relebohile George Qhobosheane, Sujjatul Islam, Muthu Ram Prabhu Elenchezhian, Vamsee Vadlamudi, Rassel Raihan, Kenneth Reifsnider

Institute of Predictive Performance Methodologies (IPPM-UTARI)-Archive

The increasing demand of early detection of barely visible damage inside fiber reinforced polymer (FRP) composites has led to the development of advanced microsensors capable of measuring local strains and defects within FRP composites. One of the major challenges in this type of local structural health monitoring (SHM) is the development of embedded sensors which can be safely placed into FRP composites while maintaining their high strength and light weight. This paper presents the development and investigation of a set of wireless magnetostrictive sensors embedded within the FRP composites for in-situ and real-time monitoring of local strains inside the composites. …

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Thermodynamic And Phase-Field Analysis Of Domain Structures And Switching Kinetics Of Bismuth Ferrite Thin Films, Ryan T. Hart Dec 2018

Thermodynamic And Phase-Field Analysis Of Domain Structures And Switching Kinetics Of Bismuth Ferrite Thin Films, Ryan T. Hart

Material Science and Engineering Theses - Archive

In this study, thermodynamic analysis and phase field simulation are utilized to study the polarization, phase transitions, and phase coexistence in BFO thin films. The effect of temperature, substrate strain, and electrical bias on the phase stability and the phase transformation pathways were studied. Existing thermodynamic analysis methods are supplemented by a phase destrain model, which determines free energy minima as a function of biaxial strain and the fractions of BFO’s ferroelectric phases in a thin film. The results of this methodology are compared with phase field modeling. The phase de-strain model shows reasonable accuracy in determining boundaries at which …

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Study Of Conduction Behavior In Dielectrics In Chip Level Interconnects: Detection Of Defects In Al/Sio2 Interconnects, Po-Cheng Lu Dec 2018

Study Of Conduction Behavior In Dielectrics In Chip Level Interconnects: Detection Of Defects In Al/Sio2 Interconnects, Po-Cheng Lu

Material Science and Engineering Dissertations - Archive

This dissertation presents four different electrical measurement techniques to detect structural defects in Al/SiO2 interconnects. These techniques, namely 1) polarity dependence measurement, 2) current voltage measurement, 3) two-point measurement and 4) discharge transient current measurement, can provide simple electrical parameters having direct relationship to defects state (type and quantity) in interconnect structure. All these measurement techniques use the MIM (metal-insulator-metal) structure such as the comb-serpentine structure commonly existing in integrated (IC) devices. This study also presents a newly discovered dielectric failure mechanism, that is the failure by a process of partial discharge dielectric breakdown phenomenon. The goal of the charging …

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Computational Study On The Cu-Rich Side Of Aluminum-Copper Phase Diagram, Khaled Ahmed Hirmas Aug 2018

Computational Study On The Cu-Rich Side Of Aluminum-Copper Phase Diagram, Khaled Ahmed Hirmas

Material Science and Engineering Dissertations - Archive

Cu-rich side of Al-Cu phase diagram has not been studied extensively as the Al-rich side. It is well established that a one-phase (a phase) exists at 300oC between the 82% Cu and pure Cu, and at the eutectic temperature (1032oC) between 86% Cu and pure Cu, a phase, when quenched from above 600oC and subjected to annealing below about 300oC, or deformation, show ordering effects in resistivity, heat capacity, diffuse X-ray, microstructure, and in mechanical properties. This has been studied to determine whether these effects are due to short-range or long-range ordered domain [1]. The present computational study is to …

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Achieving Novel Functionalities In Semiconductor-Crystalline Oxide Heterostructures Through Electrical And Structural Coupling, Kamyar Ahmadi-Majlan Aug 2018

Achieving Novel Functionalities In Semiconductor-Crystalline Oxide Heterostructures Through Electrical And Structural Coupling, Kamyar Ahmadi-Majlan

Material Science and Engineering Dissertations - Archive

Creating new materials that exhibit enhanced or novel behaviors is essential to meet the technological challenges we face today. Complex oxides are perfect candidates to overcome these challenges due to the range of electronic, optical, and ionic properties they exhibit. The research presented here, mainly focuses on overcoming two important challenges in oxide electronics. First,the ability of epitaxially growing multifunctional oxides on conventional semiconductor substrates and second, the successful integration of multifunctional oxide properties on semiconductors Oxide molecular beam epitaxy was utilized to grow transition metal oxides with unprecedented control, layer-by-layer, at the atomic scale. Such control of growth enables …

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An Investigation Of The Plasma Electrolytic Oxidation Mechanism For Coating Of Alumina-Zirconia Nanocomposite, Nastaran Barati Aug 2018

An Investigation Of The Plasma Electrolytic Oxidation Mechanism For Coating Of Alumina-Zirconia Nanocomposite, Nastaran Barati

Material Science and Engineering Dissertations - Archive

Plasma Electrolytic Oxidation (PEO) is an electrochemical surface modification technique which is able to coat ceramic coatings on valve metals from either cationic or anionic species in an aqueous electrolyte. Applying high voltage in the range of 300-600 V is required to achieve crystalline phases. PEO is a clean technology which offers several benefits including high deposition rates, excellent adhesion strength and mechanical properties. One of the interesting capabilities of the PEO process is its ability to form composite coatings. The following work aims to study the growth mechanism of nanocomposite layers coated by PEO. Two experimental routs have been …

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Spectral-Domain Phase-Sensitive Interferometry For Real-Time Probing Of Electrodeposition Processes, Yujen Chiu Aug 2018

Spectral-Domain Phase-Sensitive Interferometry For Real-Time Probing Of Electrodeposition Processes, Yujen Chiu

Material Science and Engineering Dissertations - Archive

Electrodeposition is a simple, versatile and scalable method for depositing thin metal films on conductive substrates, and it has long been used in large-scale industrial processes for metal film coating. In the last two decades, electrodeposition has entered into the manufacturing processes of electronic devices. Electrodeposition of Cu has become the standard process for the backend processes for almost all microelectronic devices. Electrodeposition of Cu and magnetic materials are used in the fabrication of write/read head in computer hard disk drive. More recently, a unique electrodeposition process, under potential deposition (UPD), has been utilized for atomic layer deposition to generate …

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Investigation Of Surface Contamination In A Cu-Based Al Alloy Occurring During Tem Sample Preparation, Kelly Claunch Aug 2018

Investigation Of Surface Contamination In A Cu-Based Al Alloy Occurring During Tem Sample Preparation, Kelly Claunch

Material Science and Engineering Theses - Archive

This thesis investigates the nature of surface contamination originating from the jet-polishing process on Cu-6 wt% Al TEM disks. During previous TEM imaging and diffraction analysis performed by our group, surface contamination particles, roughly 15-60 nm in diameter, were observed on the surface of the jet-polished TEM disks. Further, TEM diffraction analysis revealed that the contamination particles were growing epitaxially on the Cu matrix. HR-SEM was used to characterize the surface contamination in terms of shape, size, composition, and distribution on the surface of the disks. Through extensive HR-SEM imaging, it was found that surface contamination particles are present on …

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Fabrication Of Solid Polymeric 3d Shapes From Programmable Flat Hydrogel Sheets, Ninad Vilas Khadse May 2018

Fabrication Of Solid Polymeric 3d Shapes From Programmable Flat Hydrogel Sheets, Ninad Vilas Khadse

Material Science and Engineering Theses - Archive

Modern methods of fabricating three-dimensional (3D) objects include sheet metal forming, thermoforming, and additive manufacturing among others. These methods have their own advantages and disadvantages regarding scalability, customizability, and time efficiency. A promising approach is to program the growth (expansion and contraction) of hydrogel sheets to form 3D structures. The differential growth-induced 3D shaping approach has the advantages of traditional manufacturing (scalability) and additive manufacturing (customizability). The objective of this study is to create nanocomposite 3D structures that are stable in ambient environment using the growth-induced 3D shaping approach. This study determines the effect of silica nanoparticles in hydrogels on …

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Characterization Of Normal And Abnormal Bones By Raman Spectroscopy : Analysis Of Mineral To Matrix Ratio Of Bone Using Advanced Materials Characterization Techniques, Meet Yagnesh Shah May 2018

Characterization Of Normal And Abnormal Bones By Raman Spectroscopy : Analysis Of Mineral To Matrix Ratio Of Bone Using Advanced Materials Characterization Techniques, Meet Yagnesh Shah

Material Science and Engineering Theses - Archive

Bone disorders and disease are associated with multiple factors. Some of the disorders and diseases are difficult to understand because of their unknown root causes. Our goal was to differentiate between normal and genetically modified rat bone groups by finding the difference in mineral to matrix (Mn/Mx) content using Raman spectroscopy. Raman spectroscopy gives the chemical composition based on the vibration modes of the molecules. Quantitative analysis of Mn/Mx content calculated from Raman spectra allowed us to distinguish between healthy and genetically modified rat bone groups. We have presented the results by averaging the Mn/Mx ratios. Thus, the most significant …

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Quantitative Analysis Of Mineral/Matrix To Evaluate Genetically Altered Bone With Infrared Spectroscopy And X-Ray Spectral Imaging, Sunil Balasaheb Yadav May 2018

Quantitative Analysis Of Mineral/Matrix To Evaluate Genetically Altered Bone With Infrared Spectroscopy And X-Ray Spectral Imaging, Sunil Balasaheb Yadav

Material Science and Engineering Theses - Archive

This thesis focuses on the characterization of bone with the help of Fourier Transform Infrared Spectroscopy and Energy Dispersive Spectroscopy. Such analysis of the physics and chemistry of biomaterials is vital to resolve problems in life science of bone-related diseases and disorders. Material characterization can help in the understanding of disease mechanisms and lead to useful drugs and other treatments. In this thesis, I have used bone materials produced by groundbreaking research at UT Southwestern Research Center and Texas Scottish Rite Children's Hospital to establish that idiopathic clubfoot (Talipes equinovarus) is associated with the Follistatin 5 gene. We studied healthy …

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Study Of Copper-Rich Intermetallic Phase Formation In Copper-Aluminum Binary System, Valery Georges Ouvarov-Bancalero May 2018

Study Of Copper-Rich Intermetallic Phase Formation In Copper-Aluminum Binary System, Valery Georges Ouvarov-Bancalero

Material Science and Engineering Dissertations - Archive

This work aims to study the initial formation and subsequent growth of intermetallic compounds (IMC) in the binary Al-Cu system. Al-Cu pair configurations have been successfully used for several decades as structural components, and extensive research on their mechanical and metallurgical properties is available. More recently, the microelectronics industry started implementing the Cu wire-bond technology, which renewed the interest of the scientific community. As with every technological evolution, initial quality and reliability issues arose. Copper (Cu) wire to aluminum (Al) bond-pad is prone to crack nucleation leading to failure at the interface between Cu and Cu-rich IMCs. Even though numerous …

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Detection And Prediction Of Defects In Composite Materials Using Di-Electric Characterization And Neural Networks, Muthu Ram Prabhu Elenchezhian, Aishwarya Nandini, Vamsee Vadlamudi, Rassel Raihan, Kenneth Reifsnider May 2018

Detection And Prediction Of Defects In Composite Materials Using Di-Electric Characterization And Neural Networks, Muthu Ram Prabhu Elenchezhian, Aishwarya Nandini, Vamsee Vadlamudi, Rassel Raihan, Kenneth Reifsnider

Institute of Predictive Performance Methodologies (IPPM-UTARI)-Archive

The state of art non-destructive inspection techniques for composite materials detect the presence of defects in the composite material, but they do not identify what type of defect it is, and hence, further visual inspection of the details are needed. This visual classification is a costly and time-consuming process, and it’s difficult to distinguish all of the defects effectively. Broadband Dielectric Spectroscopy (BbDS), has been an established tool for dielectric material characterization in polymer industries for a long time. Dielectric spectra of heterogeneous materials are altered by constituent interfaces, with changes in morphological heterogeneity, electrical and structural interactions between particles, …

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Osteoprogenitor Cell Adhesion And Growth On The Bioactive Silicon Nitride Surface For Craniofacial Implants Applications, Kamal Awad May 2018

Osteoprogenitor Cell Adhesion And Growth On The Bioactive Silicon Nitride Surface For Craniofacial Implants Applications, Kamal Awad

Material Science and Engineering Theses - Archive

As a novel biomaterial, silicon nitride (Si3N4) has been used for orthopedic and spinal fusion applications. Its ability to promote continuity for structural support of missing bone, by in/on bone growth, gives it advantageous properties and potential for mandibular and craniofacial reconstruction applications. Yet, the surface properties of this material and its effect on the osteogenic properties have not been fully realized. Thus, the aim of this study was to evidently investigate the surface properties of the bioactive Si3N4 that enhance the calvarial osteoblasts cell adhesion, growth, and differentiation when compared to conventional implant materials such as titanium (Ti) and …

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