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Articles 1 - 11 of 11

Full-Text Articles in Nanoscience and Nanotechnology

Design And Simulation Of A Miniature Cylindrical Mirror Auger Electron Energy Analyzer With Secondary Electron Noise Suppression, Jay A. Bieber Nov 2017

Design And Simulation Of A Miniature Cylindrical Mirror Auger Electron Energy Analyzer With Secondary Electron Noise Suppression, Jay A. Bieber

Graduate Theses and Dissertations

In the nanoscale metrology industry, there is a need for low-cost instruments, which have the ability to probe the structrure and elemental composition of thin films. This dissertation, describes the research performed to design and simulate a miniature Cylindrical Mirror Analyzer, (CMA), and Auger Electron Spectrometer, (AES). The CMA includes an integrated coaxial thermionic electron source. Electron optics simulations were performed using the Finite Element Method, (FEM), software COMSOL. To address the large Secondary Electron, (SE), noise, inherent in AES spectra, this research also included experiments to create structures in materials, which were intended to suppress SE backgound noise in ...


Periodically Patterned Structures For Nanoplasmonic And Biomedical Applications, Akshit Peer Jan 2017

Periodically Patterned Structures For Nanoplasmonic And Biomedical Applications, Akshit Peer

Graduate Theses and Dissertations

Periodically patterned nanostructures have imparted profound impact on diverse scientific disciplines. In physics, chemistry, and materials science, artificially engineered photonic crystals have demonstrated an unprecedented ability to control the propagation of photons through light concentration and diffraction. The field of photonic crystals has led to many technical advances in fabricating periodically patterned nanostructures in dielectric/metallic materials and controlling the light-matter interactions at the nanoscale. In the field of biomaterials, it is of great interest to apply our knowledge base of photonic materials and explore how such periodically patterned structures control diverse biological functions by varying the available surface area ...


Advances In Single Molecule Microscopy: Protein Characterization, Force Analysis And Fluorescence Localization, Chi-Fu Yen Jan 2017

Advances In Single Molecule Microscopy: Protein Characterization, Force Analysis And Fluorescence Localization, Chi-Fu Yen

Graduate Theses and Dissertations

Recent advances in single molecule techniques have allowed scientists to address biological questions which cannot be resolved by traditional ensemble measurements. In this dissertation, I integrate single molecule and bulk measurements to establish a direct link between copper exposure and neurotoxicity in prion disease. Furthermore, I develop a new analysis method to improve the accuracy of kinetic parameter estimation in single molecule Atomic Force Microscope (AFM) experiments. Finally, I develop a new fluorescence localization microscopy to identify the axial position of a single fluorescent object with sub-nanometer accuracy.

Prion diseases are characterized by the misfolding and oligomerization of prion protein ...


Mems Tunable Infrared Metamaterial And Mechanical Sensors, Qiugu Wang Jan 2017

Mems Tunable Infrared Metamaterial And Mechanical Sensors, Qiugu Wang

Graduate Theses and Dissertations

Sub-wavelength resonant structures open the path for fine controlling the near-field at the nanoscale dimension. They constitute into macroscopic “metamaterials” with macroscale properties such as transmission, reflection, and absorption being tailored to exhibit a particular electromagnetic response. The properties of the resonators are often fixed at the time of fabrication wherein the tunability is demanding to overcome fabrication tolerances and afford fast signal processing. Hybridizing dynamic components such as optically active medium into the device makes tunable devices. Microelectromechanical systems (MEMS) compatible integrated circuit fabrication process is a promising platform that can be merged with photonics or novel 2D materials ...


Development Of An Enzymatic Glucose Biosensor For Applications In Wearable Sweat-Based Sensing, Allison Anne Cargill Jan 2016

Development Of An Enzymatic Glucose Biosensor For Applications In Wearable Sweat-Based Sensing, Allison Anne Cargill

Graduate Theses and Dissertations

The recent development and commercial availability of wearable devices like the FITBIT® and Apple Watch® reflect an increasing consumer interest in actively monitoring health parameters. Though wearable devices are beginning to emerge in a variety of fields and applications, there is particular interest in the development of wearable monitors for continuously sensing blood glucose levels. Diabetes currently affects nearly 10% of the American population, a number that is expected to rise in the near future, prompting increased interest in noninvasive methods of monitoring glucose levels. This interest in noninvasive monitoring and the recent advent of continuous monitoring products ...


Enhancing Nerve Regeneration In The Peripheral Nervous System Using Polymeric Scaffolds, Stem Cell Engineering And Nanoparticle Delivery System, Anup Dutt Sharma Jan 2016

Enhancing Nerve Regeneration In The Peripheral Nervous System Using Polymeric Scaffolds, Stem Cell Engineering And Nanoparticle Delivery System, Anup Dutt Sharma

Graduate Theses and Dissertations

Peripheral nerve regeneration is a complex biological process responsible for regrowth of neural tissue following a nerve injury. The main objective of this project was to enhance peripheral nerve regeneration using interdisciplinary approaches involving polymeric scaffolds, stem cell therapy, drug delivery and high content screening. Biocompatible and biodegradable polymeric materials such as poly (lactic acid) were used for engineering conduits with micropatterns capable of providing mechanical support and orientation to the regenerating axons and polyanhydrides for fabricating nano/microparticles for localized delivery of neurotrophic growth factors and cytokines at the site of injury. Transdifferentiated bone marrow stromal cells or mesenchymal ...


Optical Communication Using Hybrid Micro Electro Mechanical Structures (Mems) And Commercial Corner Cube Retroreflector (Ccr), Sunny Kedia Nov 2015

Optical Communication Using Hybrid Micro Electro Mechanical Structures (Mems) And Commercial Corner Cube Retroreflector (Ccr), Sunny Kedia

Graduate Theses and Dissertations

This dissertation presents a free-space, long-range, passive optical communication system that uses electrostatically modulated microelectromechanical systems (MEMS) structures coupled with a glass total internal reflection (TIR)-type corner cube retroreflector (CCR) as a non-emitting data transmitter. A CCR consists of three mirrors orthogonal to each other, so that the incident beam is reflected back to the incident beam, source. The operational concept is to have a MEMS modulator fusion with TIR CCR, such that the modulators are working periodically to disrupt the evanescent waves at the air interface of one of the three back glass faces of a TIR CCR ...


Development Of Smartphone-Based Spectroscopy Instruments For Diagnostic Test Analysis, Benjamin Jin Seong Ch'ng Jan 2015

Development Of Smartphone-Based Spectroscopy Instruments For Diagnostic Test Analysis, Benjamin Jin Seong Ch'ng

Graduate Theses and Dissertations

The latest generation of smartphones are more powerful than the first computer that sent the man to the moon. These smartphones are increasingly seen as handheld computers due to the capabilities that can be done with smartphones. Therefore, in this thesis, we will demonstrate the utilization of a smartphone-based spectrometer using the CMOS CCD chip of the camera. The characterization and integration between the smartphone and spectrometer is done to ensure robust and reliable results. The smartphone-based spectrometer is able to measure accurately and made to be comparable to industrial spectrometers. This research was done in order to attempt to ...


Plasma Surface Interactions In Nanoscale Processing: Preservation Of Low-K Integrity And High-K Gate-Stack Etching With Si Selectivity, Juline Shoeb Jan 2012

Plasma Surface Interactions In Nanoscale Processing: Preservation Of Low-K Integrity And High-K Gate-Stack Etching With Si Selectivity, Juline Shoeb

Graduate Theses and Dissertations

Plasma-surface interactions are very important in the fabrication of the nm-sized features of integrated circuits. Plasma processes are employed to produce high-resolution patterns in many of the thin layers of silicon integrated circuits and to remove masking layers while maintaining high selectivity. Integrated plasma processes consisting of sequential steps such as etch, clean and surface modification, are used in semiconductor industries. The surface in contact with the process plasma is exposed to the fluxes of neutrals, ions, molecules, electrons and photons.

Modeling of surface reaction mechanisms requires the determination of the characterizations of fluxes (e.g. composition, magnitude, energy and ...


Fabrication And Characterization Of Electrospun Cactus Mucilage Nanofibers, Yanay Pais Jan 2011

Fabrication And Characterization Of Electrospun Cactus Mucilage Nanofibers, Yanay Pais

Graduate Theses and Dissertations

This work seeks to fabricate, optimize, and characterize nanofibers of cactus Opuntia ficus-indica mucilage and Poly (vinyl alcohol) (PVA) by electrospinning. Mucilage is a neutral mixture of sugars produced by cactus and PVA is a non-toxic, water-soluble, synthetic polymer, which is widely used as a co-spinning agent for polymers. Mucilage was extracted from the cactus pad and prepared for electrospinning by mixing with acetic acid. Two types of PVA were used differentiating in high and low molecular weights. Concentrations of PVA were varied to find an adequate threshold for fiber formation. Changing the ratio of PVA to cactus mucilage produced ...


Magneto-Dielectric Polymer Nanocomposite Engineered Substrate For Rf And Microwave Antennas, Cesar A. Morales Jan 2011

Magneto-Dielectric Polymer Nanocomposite Engineered Substrate For Rf And Microwave Antennas, Cesar A. Morales

Graduate Theses and Dissertations

This dissertation presents the first reported systematic investigation on the implementation of multilayer patch antennas over Fe3O4-based polymer nanocomposite (PNC) magneto-dielectric substrates. The PNC substrate is created by the monodispersion of Fe3O4 nanopthesiss, with mean size of 7.5nm, in a polymeric matrix of Polydimethylsiloxane (PDMS).

Recently, magneto-dielectric substrates have been proposed by several researchers as a means for decreasing the size and increasing the bandwidth of planar antennas. Nevertheless, factors such as high loss and diminished control over magnetic and dielectric properties have hindered the optimal performance of antennas. In addition, the incompatibility and elevated complexity prevents integration of ...