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Publications

Search Publications by Stephanie Hooker

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Displaying 1 - 19 of 19

Development of stabilized zero valent iron nanoparticles

January 31, 2012
Author(s)
Lauren F. Greenlee, Stephanie A. Hooker
Many organic micropollutants have recently been identified in natural water sources and finished drinking water; many of these compounds are not successfully degraded or removed by current water treatment processes. There is an increasing interest in

Characterization of Stabilized Zero Valent Iron Nanoparticles

December 10, 2011
Author(s)
Lauren F. Greenlee, Stephanie A. Hooker
The demonstrated toxicity of certain groups of organic micropollutants in water sources has motivated research in developing novel materials that are able to remove dissolved organic molecules from an aqueous system through adsorption and/or degradation

Measuring Up to Sustainable Water: Report from the 2010 NIST/Virginia Tech. Water Workshop

September 9, 2010
Author(s)
Lauren F. Greenlee, Jessica D. Torrey, Stephanie A. Hooker, Michael J. Fasolka, Sunil K. Sinha, Marc A. Edwards
Securing water sources of sufficient quality and quantity poses a major barrier to growing communities. Major investments in capitol and materials are planned in water treatment and distribution system infrastructure over the next several decades, but

Quartz Crystal Microbalances for Microscale Thermogravimetric Analysis

June 20, 2010
Author(s)
Elisabeth Mansfield, Aparna Kar, Stephanie A. Hooker
A new method for analyzing the chemical purity and consistency of microscale samples is described using a quartz crystal microbalance (QCM) sensor platform. The QCM is used to monitor sub-picogram changes in the mass of a deposited thin film as a function

Sample Preparation Protocols for Realization of Reproducible Characterization of Single-walled Carbon Nanotubes

December 1, 2009
Author(s)
Angela R. Hight Walker, Jeffrey A. Fagan, Stephanie A. Hooker, Michael T. Postek, Stephen A. Wise, Andras Vladar, Rolf L. Zeisler
Harmonized sample pre-treatment is an integral first step in ensuring metrological quality of measurements as regards repeatability, inter-laboratory reproducibility and commutability. The development of standard preparation methods for SWCNT samples is

Measurement Issues in Single-Wall Carbon Nanotubes

March 15, 2008
Author(s)
S Arepalli, Stephen W. Freiman, Stephanie A. Hooker, Kalman D. Migler
Recommended Practice Guide for Single Wall Carbon Nanotube Characterization consisting of five chapters: Introduction; Thermogravimetric Analysis (TGA) ; Near-IR Spectroscopy (NIR), Raman Spectroscopy, Optical, Electron, and Scanned Probe Microscopy.

Characterization of degradation mechanisms in neural recording electrodes

August 1, 2007
Author(s)
Jennifer Anton, Stephanie A. Hooker
Understanding the nature of specific neural activity is essential to the progression of research in the field of brain disorders and diseases, as well as neuroprosthetics. Microelectrodes are the primary measurement devices used to transduce neural

RAPID INSPECTION OF CARBON NANOTUBE QUALITY

July 1, 2007
Author(s)
Stephanie A. Hooker, Roy H. Geiss, Aparna Kar
Carbon nanotubes have unique properties of interest for applications in aerospace, electronics, and biotechnology. However, the properties of different batches of carbon nanotubes can vary considerably depending on chemical purity and the nanotube types

Fatigue Resistant Miniature Piezoceramic Actuators

May 17, 2006
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 piezoceramic actuators and their

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

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

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