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Search Publications by: Stephanie Hooker (Fed)

Displaying 26 - 38 of 38

Characterizing reliability of multilayer PZT actuators

February 26, 2006

Author(s)

Stephanie A. Hooker

Many new applications are emerging for piezoelectric ceramics including adaptive structures, active-flow-control devices, and vibration and noise suppression systems. Additionally, there are opportunities to use these devices in the biomedical field for

Reliability of ultra-thin insulation coatings for long-term electrophysiological recordings

February 26, 2006

Author(s)

Stephanie A. Hooker

Improved measurement of neural signals is needed for research into Alzheimer¿s, Parkinson¿s, epilepsy, strokes, and spinal cord injuries. At the heart of such instruments are microelectrodes that measure electrical signals in the body. Such electrodes must

Characterization of Carbon Nanotube Purity Using a Quartz Sensor Platform

November 28, 2005

Author(s)

Stephanie A. Hooker, Ryan Schilt, Natalia Varaksa, John H. Lehman, Paul Rice

Carbon nanotubes are revolutionary materials, with properties that are vastly different than any other bulk form of carbon. Their unique combination of electrical, mechanical, and thermal properties makes them attractive for applications in advanced

Microstructure-Controlled Multilayer PZT Actuators: Effects of Cyclic Actuation on Crystallographic Structure

November 28, 2005

Author(s)

Jens Mueller, Stephanie A. Hooker, Davor Balzar

In this study, multilayered PbTixZr1-xO3 (PZT) samples (produced at sintering temperatures in the range of 1175 degrees C ¿ 1325 degrees C) were electrically fatigued by long-term exposure (10 6 cycles) to electric fields and the parameters of initial and

CRYSTALLOGRAPHIC CHANGES IN ELECTRICALLY FATIGUED ACTUATORS

August 1, 2005

Author(s)

Jens Mueller, Davor Balzar, Stephanie A. Hooker

Many new applications are emerging for piezoelectric ceramics, including adaptive structures, vibration isolation, and nano-robotics. In these instances, actuators will likely be operated at higher electric fields than in conventional applications in order

Miniature Piezoceramic Actuators with Improved Fatigue Resistance

June 1, 2005

Author(s)

Stephanie A. Hooker, Jens Mueller, Clayton Kostelecky, K. Womer

Piezoelectric ceramics are desirable actuator materials for many biomedical applications due to their ability to generate precise, controlled motion with applied voltage. Herein, we report the fabrication of miniature piezoelectric ceramic actuators and

Thermal, electrical, and mechanical characterization of a carbon nanotube-epoxy composite

July 11, 2004

Author(s)

V Sundaram, Roop L. Mahajan, Dudley Finch, Stephanie A. Hooker

Future microelectronic circuits will need to dissipate more than 100 Watts per chip for high-performance applications, posing a thermal-management challenge for the next generation of electronic packages [1, 2]. To meet this challenge, it is imperative