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14 results on '"Guler, Zeynel"'

3. A Polyimide Composite-Based Electromagnetic Cantilever Structure for Smart Grid Current Sensing.

Author

Guler, Zeynel and Jackson, Nathan

Subjects
PIEZOELECTRIC composites, POLYIMIDE films, GLASS transition temperature, SMART structures, COMPOSITE materials, POLYIMIDES, LEAD zirconate titanate
Abstract

Polyimides (PIs) have been extensively used in thin film and micro-electromechanical system (MEMS) processes based on their excellent thermal and mechanical stability and high glass transition temperature. This research explores the development of a novel multilayer and multifunctional polymer composite electro-piezomagnetic device that can function as an energy harvester or sensor for current-carrying wires or magnetic field sensing. The devices consist of four layers of composite materials with a polyimide matrix. The composites have various nanoparticles to alter the functionality of each layer. Nanoparticles of Ag were used to increase the electrical conductivity of polyimide and act as electrodes; lead zirconate titanate was used to make the piezoelectric composite layer; and either neodymium iron boron (NdFeB) or Terfenol-D was used to make the magnetic and magnetostrictive composite layer, which was used as the proof mass. A novel all-polymer multifunctional polyimide composite cantilever was developed to operate at low frequencies. This paper compares the performance of the different magnetic masses, shapes, and concentrations, as well as the development of an all-magnetostrictive device to detect voltage or current changes when coupled to the magnetic field from a current-carrying wire. The PI/PZT cantilever with the PI/NdFeB proof mass demonstrated higher voltage output compared to the PI/Terfenol-D proof mass device. However, the magnetostrictive composite film could be operated without a piezoelectric film based on the Villari effect, which consisted of a single PI-Terfenol-D film. The paper illustrates the potential to develop an all-polymer composite MEMS device capable of acting as a magnetic field or current sensor. [ABSTRACT FROM AUTHOR]

Published
2024
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9. DESIGN, FABRICATION AND CHARACTERIZATION OF ZERO POWER SENSOR/HARVESTER FOR SMART GRID APPLICATIONS

Author

Nathan Jackson, Yu-Lin Shen, Matthias Pleil, Ali Bidram, Guler, Zeynel, Nathan Jackson, Yu-Lin Shen, Matthias Pleil, Ali Bidram, and Guler, Zeynel

Subjects
piezoelectric
Abstract

This study presents a flexible sensor/harvester device to be used in both electromagnetic sensing and energy harvesting applications for smart grids. When a current passes through a wire, the sensor detects the magnetic field created by that current. The sensor magnet interacts with the wire magnetic field resulting in a transfer of energy through the piezoelectric cantilever. Piezoelectric, conductive, magnetic, and magnetostrictive composite thin films were prepared to fabricate this device. Initially, the magnet of the cantilever was optimized considering its shape, thickness, length, taper angle etc. via both simulations and experiments. Peak to peak voltage versus cantilever position graph was drawn for several different magnets. The triangular shape showed the widest sensing range around 18 mm. Experiments have been verified by COMSOL Multi physics software simulations constructing the magnetic flux density-position graphs. After the geometry optimization of the magnet, numerous 0-3 composite thin films were fabricated using piezoelectric, conductive, magnetic, and magnetostrictive powder in different polymers for comparison. After blending the materials, the spin coating method was used with various spin speeds to obtain different film thicknesses. Mainly, lead zirconate titanate (PZT), silver (Ag), neodymium (NdFeB), and Terfenol-D particles were used to create these functional films. After demonstrating that the functional thin films fabricated in this research can be successfully used to fabricate multilayered devices such as a micro-scale capacitor or a thin film energy harvester, thin film sensor/harvester versions of the bulk devices were fabricated and tested successfully. The broadest sensitivity region was obtained again from the piezoelectric thin film that has triangular thin film magnet positioned in such a way that its tip faces the free end of the cantilever. 40 wt.% concentration Ag-PI composites were used as electrodes. Finall

Published
2023

10. Micromechanical damage analysis and engineering performance of concrete with colloidal nano-silica and demolished concrete aggregates

Author

Erdem, Savas, Hanbay, Serap, and Guler, Zeynel

Subjects
Silicon dioxide -- Mechanical properties, Micromechanics (Engineering) -- Research, Spectroscopy -- Research, Business, Construction and materials industries
Abstract

ABSTRACT In this study, different samples of concrete, containing natural and recycled coarse aggregates and different ratios of nano-silica, were delicately prepared to examine the micro-structure associated material behaviour, and [...]

Published
2018
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14. DESIGN, FABRICATION AND CHARACTERIZATION OF ZERO POWER SENSOR/HARVESTER FOR SMART GRID APPLICATIONS

Author

Guler, Zeynel

Subjects
piezoelectric, magnetostrictive, conductive, thin film, sensor, harvester, Biomedical, Electrical and Electronics, Electro-Mechanical Systems, Electronic Devices and Semiconductor Manufacturing, Mechanical Engineering, Polymer and Organic Materials, Power and Energy, Semiconductor and Optical Materials
Abstract

This study presents a flexible sensor/harvester device to be used in both electromagnetic sensing and energy harvesting applications for smart grids. When a current passes through a wire, the sensor detects the magnetic field created by that current. The sensor magnet interacts with the wire magnetic field resulting in a transfer of energy through the piezoelectric cantilever. Piezoelectric, conductive, magnetic, and magnetostrictive composite thin films were prepared to fabricate this device. Initially, the magnet of the cantilever was optimized considering its shape, thickness, length, taper angle etc. via both simulations and experiments. Peak to peak voltage versus cantilever position graph was drawn for several different magnets. The triangular shape showed the widest sensing range around 18 mm. Experiments have been verified by COMSOL Multi physics software simulations constructing the magnetic flux density-position graphs. After the geometry optimization of the magnet, numerous 0-3 composite thin films were fabricated using piezoelectric, conductive, magnetic, and magnetostrictive powder in different polymers for comparison. After blending the materials, the spin coating method was used with various spin speeds to obtain different film thicknesses. Mainly, lead zirconate titanate (PZT), silver (Ag), neodymium (NdFeB), and Terfenol-D particles were used to create these functional films. After demonstrating that the functional thin films fabricated in this research can be successfully used to fabricate multilayered devices such as a micro-scale capacitor or a thin film energy harvester, thin film sensor/harvester versions of the bulk devices were fabricated and tested successfully. The broadest sensitivity region was obtained again from the piezoelectric thin film that has triangular thin film magnet positioned in such a way that its tip faces the free end of the cantilever. 40 wt.% concentration Ag-PI composites were used as electrodes. Finally, magnetostrictive thin films having various ball-milled Terfenol-D particle concentrations were fabricated to be used as a single layer sensor instead of using multiple layers of thin films. The thin film sensors were tested using a Helmholtz coil and their response were determined in terms of tip deflection and current gained.

Published
2023

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