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Search Publications by: Stephanie S. Watson (Fed)

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Displaying 1 - 25 of 43

Temperature and light intensity effects on the photodegradation of high-density polyethylene

May 11, 2019
Author(s)
Andrew W. Fairbrother, Hsiang C. Hsueh, Jae Hyun Kim, Deborah S. Jacobs, Lakesha N. Perry, David G. Goodwin, Christopher C. White, Stephanie S. Watson, Li Piin Sung
The photodegradation of polymers poses a serious challenge to their outdoor application, and results in significant financial loss due to early or unexpected system failure. A better understanding of their degradation kinetics aids the improvement of

Road Mapping Workshop Report on Overcoming Barriers to Adoption of Composites in Sustainable Infrastructure

December 20, 2017
Author(s)
Richard J. Sheridan, Jeffrey W. Gilman, John Busel, David Hartman, Gale A. Holmes, Daniel Coughlin, Paul Kelley, Dustin Troutman, Jim Gutierrez, Charles Bakis, Robert Moser, Ellen Lackey, James R. Fekete, Stephanie S. Watson, Jae Hyun Kim, Aaron M. Forster, Ajay Krishnamurthy, Bharath NMN Natarajan, William O'Donnell
The February 2017 “Road Mapping Workshop on Overcoming Barriers to Adoption of Composites in Infrastructure” brought together designers, manufacturers, researchers, and end-users to identify barriers and potential solutions. Composite products produced in

Role of Materials Science in the Resilience of the Built Environment

December 5, 2017
Author(s)
Stephanie S. Watson, Chiara C. Ferraris, Jason D. Averill
The resilience of U.S. communities, defined as the "ability to withstand and recover rapidly from disruptive events," is directly dependent upon the ability of the built environment to maintain and support the functions upon which modern society has come

Biophysical Characterization of Functionalized Titania Nanoparticles and Their Application in Dental Adhesives

February 2, 2017
Author(s)
Jirun Sun, Elijah J. Petersen, Stephanie S. Watson, Christopher M. Sims, Alexander Kassman, Stanislav A. Frukhtbeyn, Drago Skrtic, Meryem T. Ok, Deborah S. Jacobs, Qiang Ye, Bryant C. Nelson
It is demonstrated that carboxylic acid-functionalized titanium dioxide (TiO2) NPs produce significantly higher levels of reactive oxygen species (ROS) after visible light irradiation (400–800 nm, 1600 mW/cm2) in comparison to nonfunctionalized TiO2 NPs

INVESTIGATION OF URBAN ROCK VARNISH ON THE SANDSTONE OF THE SMITHSONIAN CASTLE

September 6, 2016
Author(s)
Richard A Livingston, Carol A. Grissom, Edward Vicenzi, Zoe Weldon-Yochim, Nicole Little, Janet Douglas, Alexandre Fowler, Cara Santelli, Dorothea Macholdt, Diana Ortiz-Montalvo, Stephanie S. Watson
Bluish black, highly adherent patches have been observed growing on the Seneca sandstone of the Smithsonian Castle in Washington, DC. They are significantly enriched in Mn compared to the underlying sandstone, by a factor of 100, which suggests that

Tuning photo-catalytic activities of TiO2 nanoparticles using dimethacrylate resins

August 20, 2015
Author(s)
Jirun Sun, Stephanie S. Watson, David Allsopp, Deborah Jacobs, Drago Skrtic
Unique photo-catalytic activities (PCAs) of titanium dioxide nanoparticles (TiO2 NPs) made them attractive in many potential applications for medical devices. This study examined the benefits of the PCAs of TiO2 NPs through functionalization of the TiO2

The DNA Damaging Potential of Photoactivated P25 Titanium Dioxide Nanoparticles

September 30, 2014
Author(s)
Elijah Petersen, Vytas Reipa, Stephanie S. Watson, Deborah Jacobs, Savelas A. Rabb, Bryant C. Nelson
Titanium dioxide nanoparticles (TiO2 NPs) are found in numerous commercial and personal care products. Thus, it is necessary to understand and characterize their potential environmental health and safety risks. It is well known that photoactivated TiO2 NPs

Characterization of Metal Powders Used for Additive Manufacturing

September 16, 2014
Author(s)
John A. Slotwinski, Edward J. Garboczi, Paul E. Stutzman, Chiara F. Ferraris, Stephanie S. Watson, Max A. Peltz
Additive manufacturing (AM) techniques can produce complex, high-value metal parts, with potential applications as critical parts such as those found in aerospace components. The production of AM parts with consistent and predictable properties requires

Application of physical and chemical characterization techniques to metallic powders

August 28, 2013
Author(s)
Edward J. Garboczi, John A. Slotwinski, Max A. Peltz, Chiara F. Ferraris, Stephanie S. Watson, Paul E. Stutzman
Systematic studies have been done on two different powder materials used for additive manufacturing: stainless steel and cobalt-chrome. The characterization of these powders is important in NIST efforts to develop appropriate measurements and standards for

Physical and chemical characterization techniques for metallic powders

August 28, 2013
Author(s)
John A. Slotwinski, Paul E. Stutzman, Stephanie S. Watson, Edward J. Garboczi, Max A. Peltz, Chiara F. Ferraris
Systematic studies have been done on two different powder materials used for additive manufacturing: stainless steel and cobalt-chrome. An extensive array of characterization techniques were applied to these two powders. The physical techniques included

NIST Gold Nanoparticle Reference Materials Do Not Induce Oxidative DNA Damage

February 1, 2013
Author(s)
Bryant C. Nelson, Donald H. Atha, John T. Elliott, Bryce J. Marquis, Elijah J. Petersen, Danielle Cleveland, Stephanie S. Watson, I-Hsiang Tseng, Andrew Dillon, Melissa Theodore, Joany Jackman
Well-characterized, nanoparticle reference materials are urgently needed for nanomaterial toxicity studies. The National Institute of Standards and Technology has developed three gold nanoparticle (AuNP) reference materials (10 nm, 30 nm, 60 nm) to address

More Durable or Vulnerable? --- Effect of Nanoparticles on Long-Term Performance of Polymeric Nanocomposites during UV Exposure

July 2, 2012
Author(s)
Xiaohong Gu, Minhua Zhao, Stephanie S. Watson, Tinh Nguyen, Joannie W. Chin, Jonathan W. Martin, Dongmei Zhe, Guodong Chen
Polymers are widely used as exterior coatings in buildings, bridges, aircrafts, and automobiles for both protection and aesthetic purposes. However, the sustainability and service life of the applied coatings is limited due to the photodegradation of

Pigment and Nanofiller Photoreactivity Database

July 2, 2012
Author(s)
Stephanie S. Watson, I-Hsiang Tseng, Tarek Marray, Bastien T. Pellegrin
The service life and durability of nanocomposites that contain fillers are affected by photocatalytic properties of these fillers, particularly narrow band gap metal oxides (NBMOs) such as titanium dioxide (TiO2). When illuminated with ultraviolet (UV)

Effect of Moisture on Copolymer Fibers based on 5-amino-2-(p-aminophenyl)-benzimidazole

October 4, 2011
Author(s)
Guillaume Messin, Stephanie S. Watson, Amanda L. Forster, John R. Sieber
In recent years, there has been concern in the soft body armor community that copolymer fibers based on 5-amino-2-(p-aminophenyl)-benzimidazole can release hydrochloric acid, which could potentially be detrimental to other fibers that might come in contact

Effect of Moisture on Copolymer Fibers based on 5-amino-2-(p-aminophenyl)-benzimidazole.

September 6, 2010
Author(s)
Guillaume Messin, Amanda L. Forster, Kirk D. Rice, Michael A. Riley, Stephanie S. Watson
In recent years, there has been some concern in the soft body armor community that copolymer fibers based on 5-amino-2-(p-aminophenyl)-benzimidazole can release hydrochloric acid, which could potentially be detrimental to other fibers that might come in