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Full-Text Articles in Nanoscience and Nanotechnology

Enhancing Phase-Change Heat Transfer With Copper Nanowire-Structured Surfaces, Qian Li Jan 2014

Enhancing Phase-Change Heat Transfer With Copper Nanowire-Structured Surfaces, Qian Li

Mechanical Engineering Graduate Theses & Dissertations

As energy consumption drastically increases in the electronics and energy conversion systems, heat dissipation becomes increasingly important for device reliability and system efficiency. Phase change heat transfer, which takes advantage of the latent heat during the phase change process, is the most promising method to efficiently remove high heat fluxes. Nano structures, which provide extended surface areas and enhanced hydrophilicity or hydrophobicity have been widely used in phase change heat transfer enhancement. Copper nanowires are one of the most promising nano structures due to ease of fabrication, controllable structure dimensions, and high thermal conductivity. In this study, the heat transfer ...


Nanowire Arrays And 3d Porous Conducting Networks For Li-Ion Battery Electrodes, Miao Tian Jan 2014

Nanowire Arrays And 3d Porous Conducting Networks For Li-Ion Battery Electrodes, Miao Tian

Mechanical Engineering Graduate Theses & Dissertations

There have been growing interests in developing high-capacity, high-power, and long-cycle-life lithium-ion (Li-ion) batteries due to the increasing power requirements of portable electronics and electrical vehicles. Various efforts have been made to utilize nano-structured electrodes since they can improve the performance of Li-ion batteries compared to bulk materials in many ways: fast electrode reaction due to the large surface area, efficient volume-change accommodation due to the small size, and fast Li-ion transport along the nanoscale gaps. Among various nanostructures, nanowire arrays present an excellent candidate for high performance lithium-ion battery electrodes, which have attracted intensive research over the past few ...


Advancing Microscope And Probe Design For Near-Field Scanning Microwave Microscopy, Joel C. Weber Jan 2014

Advancing Microscope And Probe Design For Near-Field Scanning Microwave Microscopy, Joel C. Weber

Mechanical Engineering Graduate Theses & Dissertations

In this thesis, we address the design and application of a microscope and probes for near-field scanning microwave microscopy. We provide an introduction to the development of microwave microscopy and its contributions to material metrology. In particular, we focus on its application to the study of photovoltaics. We then expand beyond these studies to the fabrication of nanowire-based probes for microwave microscopy. These probes provide avenues for advancing an array of scanning probe techniques, including continued measurements on photovoltaics with improved resolution.

To begin, we present a near-field scanning microwave microscope that has been configured for imaging photovoltaic samples. Our ...


Vibration And Buckling Of Carbon Nanotube, Graphene, And Nanowire, Mohammad Hadi Mahdavi Jan 2013

Vibration And Buckling Of Carbon Nanotube, Graphene, And Nanowire, Mohammad Hadi Mahdavi

Electronic Thesis and Dissertation Repository

Nanostructured materials with superior physical properties hold promise for the development of novel nanodevices. Full potential applications of such advanced materials require accurate characterization of their physical properties, which in turn necessitates the development of computer-based simulations along with novel experimental techniques. Since controlled experiments are difficult for nanoscale materials and atomic studies are computationally expensive, continuum mechanics-based simulations of nanomaterials and nanostructures have become the focal points of computational nano-science and materials modelling.

In this study, emphasis is given to predicting the mechanical behaviour of carbon nanotube (CNT), graphene, nanowire (NW), and nanowire encapsulated in carbon nanotube (NW@CNT ...


Atomic Layer Deposition Enabled Interconnect And Packaging Technologies For As-Grown Nanowire Devices, Jen-Hau Cheng Jan 2010

Atomic Layer Deposition Enabled Interconnect And Packaging Technologies For As-Grown Nanowire Devices, Jen-Hau Cheng

Mechanical Engineering Graduate Theses & Dissertations

Nanowires (NWs) have attracted considerable interests in many applications due to their small size, extremely high surface-to-volume ratio, and superior material properties. They are promising material candidates as fundamental building blocks for future electronic, optoelectronic, energy, sensor, and biomedical applications. The majority of research activities have focused on the synthesis of NWs. With the advent of high-performance NWs, interconnect and packaging of NWs are becoming increasingly important for device applications. Vertical NW array devices, compared with horizontal NW configurations, are of great importance for achieving ultra-high integration density at the device level without the need of additional assembly and rearrangement ...


Nanomaterial Characterization Using Actuated Microelectromechanical Testing Stages, Joseph James Brown Jan 2010

Nanomaterial Characterization Using Actuated Microelectromechanical Testing Stages, Joseph James Brown

Mechanical Engineering Graduate Theses & Dissertations

In this work, microfabricated mechanical systems have been created in a variety of forms and operated to perform nanomaterials characterization tests. A simplified integrated test system was developed and used to collect data from a range of materials including gallium nitride nanowires. A new force estimation approach was developed which enables estimation of the forces provided by electrothermal microelectromechanical (MEMS) actuators, and with knowledge of a material specimen cross-section area, an estimation of the engineering stress within the nanomaterial specimen.

In an expanded design, a MEMS micromanipulator probe interfaced with a removable specimen holder, also known as a test coupon ...