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Search Publications

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Displaying 1401 - 1425 of 2320

In-Situ Method for Measuring the Mechanical Properties of Nafion Thin Films during Hydration Cycles

August 15, 2015
Author(s)
Kirt A. Page, Jae W. Shin, Scott Eastman, Brandon W. Rowe, Sangcheol Kim, Ahmet Kusoglu, Kevin G. Yager, Gery R. Stafford
Perfluorinated ionomers, in particular Nafion, are an essential component in hydrogen fuel cells, as both the proton exchange membrane and the binder within the catalyst layer. During normal operation of a hydrogen fuel cell the ionomer will progressively

Hydrogen induced amorphization of LaMgNi4 phase in metal hydride alloys

August 3, 2015
Author(s)
Leonid A. Bendersky, Haoting Shen, Kwo Young, Taihei Ouchi
Hydrogen induced amorphization (HIA) of the LaMgNi4 phase at 30C was found in three LaMgNi4/LaNi5 two-phase metal hydride (MH)-forming alloys. The amorphization happened at the first dehydrogenation cycle from a fully hydrided alloy, and the process is

Localization and Number of Au Nanoparticles in Optically Indexed Cells by FIB Tomography

August 2, 2015
Author(s)
Aric W. Sanders, Kavita M. Jeerage, Ann C. Chiaramonti Debay, Alexandra Curtin
Gold nanoparticles (GNPs) are gaining importance as therapeutic chemical delivery vehicles, medical diagnostic tools, phototherapeutic and contrast enhancement agents. GNPs are uniquely suited for these biological uses because of their chemical stability

Atomically thin layers of B-N-C-O with tuneable composition

July 31, 2015
Author(s)
Ann C. Chiaramonti Debay, Birol Ozturk, Andres de Luna Bugallo, Eugene Panaitescu, Fangze Liu, Anthony Vargas, Xueping Jiang, Ozgur Yavuzcetin, Majed Alnaji, Yongui Zhao, Nicholas King, Madan Dubey, Saroj Nayak, Srinivas Sridhar, Swastik Kar
Atomically thin ternary compounds/alloys of boron, nitrogen and carbon have generated significant excitement as they provided the first instance of a tuneable 2D material that affords rich physics as well applications potentials. Interestingly, the crucial

Characterization of clay composite ballistic witness materials

July 29, 2015
Author(s)
Jonathan E. Seppala, Yoonae Heo, Paul E. Stutzman, John R. Sieber, Chad R. Snyder, Kirk D. Rice, Gale A. Holmes
Mechanical and thermal properties of Roma Plastilina Clay #1 (RP1) were studied through small-amplitude oscillatory shear (SAOS), large-amplitude oscillatory shear (LAOS), and differential scanning calorimetry (DSC), supplemented with thermogravimetric

Role of Elastic Strain on Electrocatalysis of Oxygen Reduction Reaction on Pt

July 23, 2015
Author(s)
Gery R. Stafford, Vijay Sethuraman, Deepa Vairavapandian, Manon C. Lafouresse, Tuhina Maark, Naba Karan, Shouheng Sun, Ugo Bertocci, Andrew Peterson, Pradeep Guduru
The effect of elastic strain on catalytic activity of platinum (Pt) towards oxygen reduction reaction (ORR) is investigated through de-alloyed Pt-Cu thin films; stress evolution in the de-alloyed layer and the mass of the Cu removed are measured in real

Perspective: What do we still need to understand to commercialize nanocellulose?

July 20, 2015
Author(s)
Chelsea S. Davis, Danielle L. Grolman, Alamgir Karim, Jeffrey W. Gilman
Cellulosic nanomaterials have the potential to become predominant nanoparticles utilized in materials engineering fields ranging from flexible electronic supports1–3 and tissue scaffolds4,5 to nanocomposite reinforcement materials6–9 and aerogels for oil

Synthesis and Characterization of Bournonite PbCuSbS3 Nanocrystals

July 10, 2015
Author(s)
Kaya Wei, Joshua Martin, James Salvador, George S. Nolas
PbCuSbS3 nanocrystals were synthesized for the first time by a colloidal synthesis route and characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS). The particle size of

Aging of Polymeric Films used in Protective Glazing Systems

July 7, 2015
Author(s)
Christopher C. White, Donald L. Hunston, Kar T. Tan
The toughness of polymer and glass laminates or win-dow glazing, are used to protect buildings and occupants from shattered glass resulting from natural disasters (e.g., hurricanes, tornadoes, seismic events), and intentional events (e.g., robbery

Gd(sub 90)Co(sub 2.5)Fe(sub 7.5) Alloy Displaying Enhanced magnetocaloric Properties

July 3, 2015
Author(s)
Virgil Provenzano, Robert D. Shull, G Kletetschka, Paul E. Stutzman
Because of its attractive magnetocaloric properties, gadolinium (Gd) metal is currently the refrigerant of choice in the development of near-room temperature magnetic cooling prototypes (refrigerators, heat pumps, and air conditioners). The overwhelming

Strategy for extensible, evolving terminology for the Materials Genome Initiative efforts

July 1, 2015
Author(s)
Talapady N. Bhat, Ursula R. Kattner, Laura Bartolo, Carelyn E. Campbell, John T. Elliott
Intuitive, flexible, and evolving terminology plays a significant role in capitalizing on recommended knowledge representation models for material engineering applications. In this article we present a proposed rules-based approach with initial examples

Sharp interface model of creep deformation in crystalline solids

June 30, 2015
Author(s)
Yuri Mishin, Geoffrey B. McFadden, Robert F. Sekerka, William J. Boettinger
We present a rigorous irreversible thermodynamics treatment of creep deformation of solid mate- rials with interfaces described as geometric surfaces capable of vacancy generation and absorption and moving under the influence of local thermodynamic forces

Evolution of gamma/gamma-prime Microstructure in Ternary Co-Al-W Alloys

June 29, 2015
Author(s)
Eric Lass, Yaakov S. Idell, Carelyn E. Campbell, Ursula R. Kattner
The discovery of a two-phase γ (FCC)-γ' (L12) field in the ternary Co-Al-W phase diagram has sparked significant research interest into possible Co-based analogs to traditional Ni-based superalloys used in turbine engine applications. This work

A Unifying Framework to Quantify the Effects of Boundary Stiffness, Polymer-Substrate Interactions and Substrate Roughness on the Dynamics of Thin Supported Polymer Films

June 21, 2015
Author(s)
Jack F. Douglas, Paul Hanakata, Francis W. Starr, Beatriz Betancourt
Changes in the dynamics of supported polymer films in comparison to bulk materials involve a complex convolution of effects, such as boundary thermodynamic interactions, boundary roughness and compliance, in addition to finite film thickness. We consider
Displaying 1401 - 1425 of 2320
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