Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- ZnO (3)
- Electrospinning (2)
- GaN (2)
- MBE (2)
- A1GaN (1)
-
- Antibiotic (1)
- Biomimic (1)
- Bioresorbable (1)
- Carbon nanotube (1)
- Coagulation factor (1)
- Conductivity (1)
- Dielectric spectroscopy (1)
- Dispersion (1)
- EPITAXY (1)
- Electrostatic (1)
- Epitaxy (1)
- Ester (1)
- Fiber alignment (1)
- GE (1)
- LabVIEW© (1)
- Luminescence (1)
- Mandrel motion (1)
- PGA (1)
- PVDF (1)
- Polymer (1)
- Polymer composites (1)
- RHEED (1)
- Raman spectroscopy (1)
- SI Programmer (1)
- Semiconductor (1)
Articles 1 - 8 of 8
Full-Text Articles in Engineering
High Quality Zno Epitaxial Grown By Plasma Assisted Molecular Beam Epitaxy, Yun Zhang
High Quality Zno Epitaxial Grown By Plasma Assisted Molecular Beam Epitaxy, Yun Zhang
Theses and Dissertations
Described in this thesis are the growth and characterization of high quality ZnO epitaxy layers.Zinc oxide (ZnO) epitaxy layers were grown on sapphire and epi-GaN substrates respectively, using plasma assisted molecular beam epitaxy (MBE) . Various growth conditions, such as growth temperature, II/VI ratio, and buffer layers, were employed to optimize the quality of the ZnO film. The subsequent characterization of the films was carried out to evaluate the surface, optical and crystalline properties of the film, using AFM, SEM, PL and XRD techniques. It was found out that the high quality of the ZnO film was grown on epi-GaN …
Gan Epitaxy On Melt Grown Thermally Prepared Bulk Zno Substrates, Xing Gu
Gan Epitaxy On Melt Grown Thermally Prepared Bulk Zno Substrates, Xing Gu
Theses and Dissertations
Different methods were developed for the preparation of bulk ZnO substrates. Remarkable improvement on the surface, optical and crystalline quality of the bulk ZnO substrate was achieved. ZnO substrates with an atomically flat surface exhibiting terrace-like features were used as a substrate for GaN grown by MBE. High-resolution x-ray diffraction and low temperature PL results show that similar high quality GaN layers can be achieved on both annealed O-face and Zn-face ZnO substrates. The prospect of the device applications of GaN epitaxy on ZnO, including AlGaN/GaN MODFET structure on ZnO and GAN/ZnO based p-n junction were discussed.
Novel Apparatus To Control Electrospinning Fiber Orientation For The Production Of Tissue Engineering Scaffolds, Eugene David Boland
Novel Apparatus To Control Electrospinning Fiber Orientation For The Production Of Tissue Engineering Scaffolds, Eugene David Boland
Theses and Dissertations
The conception of electrospinning can trace its roots back more than 400 years, when it was observed that rubbed amber can deform a droplet of water on a smooth surface, and is based upon simple concepts of charge separation and surface tension. Since that time, considerable effort has been directed at both the cause and utility of this phenomenon. The specific aim of this dissertation project was to develop an automated electrostatic processing apparatus that was capable of controlling the three-dimensional architecture of an electrospun scaffold to further improve its utility in tissue engineering. The efficacy of using this technique …
Luminescence In Zno, Jin Xu
Luminescence In Zno, Jin Xu
Theses and Dissertations
As a wide band semiconductor with a large binding energy (about 60meV), ZnO is a promising candidate semiconductor material for the next generation of optoelectronic , light emission or high power and high frequency devices. In order to make electrical device from ZnO, it is necessary to investigate optical properties of ZnO.In this thesis, PL setup and the properties of ZnO are introduced briefly and the optical properties of ZnO are investigated in detail. Temperature dependence of PL spectra of ZnO are measured and analyzed. Sharp emission line of PL spectra of rare earth (RE) doped ZnO are also investigated.
Incorporation Of Tetracycline Hydrochloride Into Electrospun Fibrinogen: A Study Of Mechanical Properties And Time Release, Charles Dudley Anderson Jr.
Incorporation Of Tetracycline Hydrochloride Into Electrospun Fibrinogen: A Study Of Mechanical Properties And Time Release, Charles Dudley Anderson Jr.
Theses and Dissertations
Electrospinning has the capacity to create fibers of natural or synthetic polymers with dimensions that are similar to analogous fibers in native tissue. Mats consisting of fibers of these sub-micron dimensions have shown promise in provoking little immune response and in offering a habitable environment for cell proliferation. Fibrinogen is a natural protein capable of being electrospun and offers the benefit of existing as part of the natural coagulation cascade. Mats of fibrinogen could be utilized as possible hemostatic dressings or as an early scaffold for cell migration for either wound repair or tissue engineering. The addition of antibiotic into …
Iii-Nitride Semiconductors Grown By Plasma Assisted Molecular Beam Epitaxy, Lei He
Iii-Nitride Semiconductors Grown By Plasma Assisted Molecular Beam Epitaxy, Lei He
Theses and Dissertations
III-nitride semiconductors are of great interest owing to their commercial and military applications due to their optoelectronic and mechanical properties. They have been synthesized successfully by many growth methods. Among them, molecular beam epitaxy (MBE) is a promising epitaxial growth method owing to precise control of growth parameters, which significantly affect the film properties, composition, and thickness. However, the understanding of growth mechanism of III-nitride materials grown in this growth regime is far from being complete.In this dissertation, GaN and AIGaN growth mechanism under metal-rich conditions were investigated. The Ga surface desorption behavior during the growth was investigated systematically using …
Electrospinning As A Processing Method For Electroactive Polymers And Composites, Kristin Joy Pawlowski
Electrospinning As A Processing Method For Electroactive Polymers And Composites, Kristin Joy Pawlowski
Theses and Dissertations
Electrospinning was examined for its potential to create functional materials. Three distinct electroactive materials were electrospun into fibers and fiber mats and then characterized with the intent of determining their utility in aerospace and biomedical applications such as micro-air vehicles and the cardiovascular system. Electrospun Graft Elastomers demonstrated potential as actuators, as electromechanical strain testing showed comparable response to the film form of this material. Further improvement of electroactive response was realized with high dielectric inclusions and fiber orientation. Electrospin processing imparted piezoelectric properties to the fibers of poly(vinylidene fluoride). Differential scanning calorimetry and infrared spectroscopy indicated a degree of …
Characterization Of Aligned Carbon Nanotube/Polymer Composites, Sumanth Banda
Characterization Of Aligned Carbon Nanotube/Polymer Composites, Sumanth Banda
Theses and Dissertations
The main objective of this thesis is to efficiently disperse and align SWNTs in two different polymer matrices to obtain an orthotropic composite whose strength, stiffness and electrical properties depend on the orientation of the SWNTs. The SWNTs are successfully dispersed and aligned in a polyimide matrix and a polymer blend of UDMA/HDDMA. In-situ polymerization under sonication is used to disperse the SWNTs in polyimide matrix and sonication is used to disperse SWNTs in the UDMA/HDDMA matrix. In both cases, an electric field is used to align the SWNTs in the polymer matrices. In the polyimide, the SWNTs are aligned …