Publications

Displaying 26 - 50 of 115

Chemical and Physical Transformations of Silver Nanomaterial Containing Textiles After Modelled Human Exposure

April 16, 2019

Author(s)

Danielle E. Gorka, Nancy Lin, John M. Pettibone, Justin Gorham

The antimicrobial properties of silver nanomaterials (AgNM) have been exploited in various consumer applications, including textiles such as wound dressings. Understanding how these materials chemically transform throughout their lifecycle is necessary to

A Digital Holographic Microscopy Study of Beta-Dicalcium Silicate Dissolution Kinetics in Water

March 10, 2019

Author(s)

Alexander S. Brand, Justin Gorham, Jeffrey W. Bullard

The surface normal dissolution flux of beta dicalcium silicate is quantified using in situ digital holographic microscopy. The dissolution flux in flowing solutions depends on the water activity to an empirically determined power of 1.7. The heterogeneous

Determining surface chemical composition of silver nanoparticles during sulfidation by monitoring the ligand shell

November 23, 2018

Author(s)

John M. Pettibone, Justin M. Gorham, Jingyu Liu

Evaluating the surface and core compositions of transforming nanoparticles (NP) represents a significant measurement challenge but is necessary for predicting performance in applied systems and their toxicity in natural environments. Here, we use X-ray

Approaches for the Quantitative Analysis of Oxidation State in Cerium Oxide Nanomaterials

September 21, 2018

Author(s)

Christopher M. Sims, Russell A. Maier, Aaron C. Johnston-Peck, Justin M. Gorham, Vincent A. Hackley, Bryant C. Nelson

Cerium oxide nanomaterials (nanoceria, CNMs) are receiving increased attention from the research community due to their unique chemical properties, most prominent of which is their ability to alternate between the Ce3+ and Ce4+ oxidation states. While many

Diffusion in the Ti-Al-V system

August 23, 2018

Author(s)

Greta Lindwall, Kil-Won Moon, Zhangqi Chen, Michael J. Mengason, Maureen E. Williams, Justin Gorham, Ji-Cheng Zhao, Carelyn E. Campbell

Diffusion in the Ti-Al-V system is studied and a CΑLPHAD diffusion mobility description is developed. Diffusion couple experiments are used to obtain information of Al and V diffusion in the α phase. This includes diffusion paths at the temperatures 923 K

Surface Properties of Laser-treated Molybdenum Disulfide Nanosheets for Optoelectronic Applications

May 30, 2018

Author(s)

Frank W. DelRio, Justin M. Gorham, Koo-hyun Chung, Bien Cuong Tran Khac

Transition metal dichalcogenide two-dimensional materials have attracted significant attention due to their unique optical, mechanical, and electronic properties. For example, molybdenum disulfide (MoS2) exhibits a tunable band gap that strongly depends on

Physical and Chemical Transformations of Silver Nanomaterials in Textiles After Use and Disposal

May 14, 2018

Author(s)

Danielle E. Gorka, Justin Gorham

Silver nanomaterials (AgNMs) have been increasingly used in consumer products for their antibacterial properties. Textiles, including wound dressings, are just one of the many products which take advantage of AgNM's antimicrobial properties. To better

Physical and Chemical Transformations of Silver Nanomaterial-containing Textiles After Use

May 13, 2018

Author(s)

Danielle E. Gorka, Justin Gorham

Nanomaterials have been increasingly used in consumer products and silver nanomaterials (AgNMs) especially have been used for their antimicrobial properties. As use of AgNMs in consumer products continues to increase, a corresponding increase in silver's

Formation of a crack-free, hybrid skin layer with tunable surface topography and improved gas permeation selectivity on elastomers using gel-liquid infiltration polymerization

September 11, 2017

Author(s)

Justin Gorham, Jason Killgore, Maryam Omidvar, Haiqing Lin, Frank W. DelRio, Lewis M. Cox, Zheng Zhang

Liquid-liquid interfacial polymerization (ll-IP) is conventionally used for manufacturing bulk polymers like nylon, as well as forming barrier layers for reverse osmosis membranes. In this work, we explore the use of gel-liquid infiltration polymerization

Photo-induced transformations of polyvinylpyrrolidone coatings on gold nanoparticles and effects on colloidal stability

July 28, 2017

Author(s)

Stacey M. Louie, Justin Gorham, Jiaojie Tan, Vincent A. Hackley

Polymeric coatings are commonly applied to impart functionality and colloidal stability to engineered nanoparticles. In natural environments, transformations of the coating can modify the particle transport behavior, but the mechanisms and outcomes of

Challenges and approaches for particle size analysis on micrographs of nanoparticles loaded onto textile surfaces

May 31, 2017

Author(s)

Samuel J. Underwood, Justin Gorham

This NIST Special Publication (SP) is one in a series of NIST SPs that address research needs articulated in the National Nanotechnology Initiative (NNI) Environmental, Health, and Safety Research Strategy published in 2011[1]. This Strategy identified a

Quantitative Analysis of Oxidation State in Cerium Oxide Nanomaterials

May 14, 2017

Author(s)

Christopher Sims, Russell Maier, Aaron Johnston-Peck, Justin Gorham, Vincent A. Hackley, Bryant C. Nelson

Cerium oxide nanoparticles (nanoceria) are receiving increased attention from the research community due to the large number and wide range of their current and potential applications. The attractiveness of nanoceria for these various applications is

Impact of UV irradiation on multiwall carbon nanotubes in nanocomposites: formation of entangled surface layer and mechanisms of release resistance

January 31, 2017

Author(s)

Tinh Nguyen, Elijah J. Petersen, Bastien T. Pellegrin, Justin M. Gorham, Thomas F. Lam, Minhua Zhao, Li Piin Sung

Carbon nanotubes (CNTs) are increasingly used in consumer and structural polymeric products to enhance a variety of properties. Under weathering, the polymer matrix will degrade and the nanofillers will potentially be released from the products, which

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