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Theses and Dissertations

MEMS

Electrical and Computer Engineering

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Selective Resistive Sintering: A Novel Additive Manufacturing Process, Austin Bryan Van Horn Dec 2016

Selective Resistive Sintering: A Novel Additive Manufacturing Process, Austin Bryan Van Horn

Theses and Dissertations

Selective laser sintering (SLS) is one of the most popular 3D printing methods that uses a laser to pattern energy and selectively sinter powder particles to build 3D geometries. However, this printing method is plagued by slow printing speeds, high power consumption, difficulty to scale, and high overhead expense. In this research, a new 3D printing method is proposed to overcome these limitations of SLS. Instead of using a laser to pattern energy, this new method, termed selective resistive sintering (SRS), uses an array of microheaters to pattern heat for selectively sintering materials. Using microheaters offers significant power savings, significantly ...


Development Of A Multi-Electrode Array (Mea) Based On Active Recruiting Of Cells And Formation Of Mechanically Confined Neural Networks, Tianyi Zhou Jan 2016

Development Of A Multi-Electrode Array (Mea) Based On Active Recruiting Of Cells And Formation Of Mechanically Confined Neural Networks, Tianyi Zhou

Theses and Dissertations

Multi-Electrode Array (MEA) systems have been widely used, for decades, in neuroscience research, such as the detection of neuroactive compounds and the study of neuronal electrophysiology and communication. Accurate positioning of neurons on electrodes enables the recording from and stimulation of specified individual neurons on a MEA. Various cell patterning techniques, integrated with MEAs, have been developed to ensure neuron-electrode correspondence, which is the capability that most conventional MEAs lack, because of the random distribution of neurons with respect to electrodes.A novel multi-electrode array system has been designed and developed for active recruitment of neurons on electrodes and the ...


Finite Element Analysis Simulations Of Micro And Nano-Electromechanical Sensors For Design Optimization, Nicholas Frank Deroller Dec 2014

Finite Element Analysis Simulations Of Micro And Nano-Electromechanical Sensors For Design Optimization, Nicholas Frank Deroller

Theses and Dissertations

Micro and Nano-electromechanical sensors (MEMS and NEMS) provide a means of actively sensing minute changes in the surrounding environment. Small changes in temperature, momentum, and strain may be sensed in passive modes while greater sensing possibilities exist in active modes. Theoretical femto-gram resolution mass detection and heated element sensing methods may be used while volatile organic compound (VOC) sensing may be achieved when combined with a functionalization layer or device heating. These devices offer a great reduction in cost and offer increased mobility by allowing a "lab-on-chip" solution for the prospective user while also greatly reducing the amount of energy ...


Piezotransistive Iii-V Nitride Microcantilever Based Mems/Nems Sensor For Photoacoustic Spectroscopy Of Chemicals, Abdul Hafiz Ibne Talukdar Dec 2014

Piezotransistive Iii-V Nitride Microcantilever Based Mems/Nems Sensor For Photoacoustic Spectroscopy Of Chemicals, Abdul Hafiz Ibne Talukdar

Theses and Dissertations

Microcantilevers are highly attractive as transducers for detecting chemicals, explosives, and biological molecules due to their high sensitivity, micro-scale dimensions, and low power consumption. Though optical transduction of the mechanical movement of the microcantilevers into an electrical signal is widely practiced, there is a continuous thrust to develop alternative transduction methods that are more conducive to the development of compact miniaturized sensors. Piezoelectric and piezoresistive transduction methods are two of the most popular ones that have been utilized to develop miniaturized sensor systems. Piezoelectric cantilevers, which are commonly made of PZT film, have demonstrated very high sensitivity; however, they suffer ...


Microfabrication Processes And Advancements In Planar Electrode Ion Traps As Mass Spectrometers, Brett Jacob Hansen Mar 2013

Microfabrication Processes And Advancements In Planar Electrode Ion Traps As Mass Spectrometers, Brett Jacob Hansen

Theses and Dissertations

This dissertation presents advances in the development of planar electrode ion traps. An ion trap is a device that can be used in mass analysis applications. Electrode surfaces create an electric field profile that trap ionized molecules of an analyte. The electric fields can then be manipulated to mass-selectively eject ions out of the trap into a detector. The resulting data can be used to analyze molecular structure and composition of an unknown compound. Conventional ion traps require machined electrode surfaces to form the electric trapping field. This class of electrode presents significant obstacles when attempting to miniaturize ion traps ...


Development Of Mems-Based Corrosion Sensor, Feng Pan Dec 2012

Development Of Mems-Based Corrosion Sensor, Feng Pan

Theses and Dissertations

This research is to develop a MEMS-based corrosion sensor, which is used for monitoring uniform, galvanic corrosion occurring in infrastructures such as buildings, bridges. The corrosion sensor is made up of the composite of micro/nano metal particles with elastomers. The mechanism of corrosion sensor is based on the mass transport of corrosive species through the sensor matrix. When the metal particles in the matrix corrode, the electrical resistivity of the material increases due to increasing particle resistances or reduction of conducting pathways. The corrosion rate can be monitored by detecting the resistivity change in sensing elements. The life span ...


Microelectromechanical Actuator And Sensor System For Measuring The Mechanical Compliance Of Biological Cells, Markus Hans Gnerlich Jan 2012

Microelectromechanical Actuator And Sensor System For Measuring The Mechanical Compliance Of Biological Cells, Markus Hans Gnerlich

Theses and Dissertations

No abstract provided.