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Search Publications

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Displaying 151 - 175 of 1646

On the chemomechanics of bubble growth in hydrogen attack of plain carbon steels

May 2, 2025
Author(s)
May Martin, Kshitij Vijayvargia, T Nguyen, Mohsen Dadfarnia, Aleksandar Staykov, Petros Sofronis, Masanobu Kubota, John Pugh
… High temperature hydrogen attack (HTHA) is a form of degradation of carbon … steels exposed to high temperature and high-pressure hydrogen whereby internal hydrogen reacting with carbides forms methane gas bubbles … high temperature hydrogen attack, steel, modeling, damage …

Thermodynamic Evaluation of Hydrogen Absorption by Niobium During SRF Fabrication

June 30, 2011
Author(s)
Richard E. Ricker, Ganapati R. Myneni
… conditions. One hypothesis for these variations is that hydrogen, absorbed during processing, is responsible for this … behind this hypothesis is that niobium can absorb hydrogen from one or more of the processing environments. … spontaneously react with water producing adsorbed atomic hydrogen that is readily absorbed into the metal. The …

Quasi-Elastic Neutron Scattering Studies of Hydrogen Dynamics for Nanoconfined NaAlH 4

July 14, 2016
Author(s)
Shathabish NaraseGowda, Craig Brown, Madhu Sudan Tyagi, Tabbetha A. Dobbins
… The hydrogen dynamics of nano-confined sodium alanate (NaAlH 4 ) … 4 indicates that there are two dynamic states of hydrogen which can be tracked by fitting the QENS signal to Lorentzian functions. The fastest hydrogen dynamics show some limited amount and range of long …

Fatigue measurement of pipeline steels for application of gaseous hydrogen transport

February 5, 2018
Author(s)
Andrew J. Slifka, Elizabeth S. Drexler, Robert L. Amaro, Louis E. Hayden, Damian S. Lauria, Nikolas W. Hrabe, Douglas G. Stalheim
… crack growth rate of pipeline steels in pressurized hydrogen gas was completed; the project was sponsored by the … in close collaboration with the ASME B31.12 Committee on Hydrogen Piping and Pipelines. Four steels were selected, two X52 and two X70 alloys. Other variables included hydrogen gas pressures of 5.5 MPa and 34 MPa, a load ratio, …

Monoammoniate of Calcium Amidoborane - Synthesis, Structure and Hydrogen-Storage Properties

January 9, 2012
Author(s)
Yong Shen Chua, Hui Wu, Wei Zhou, Terrence J. Udovic, Guotao Wu, Zhitao Xiong, Ming Wah Wong, Ping Chen
… by the decomposition of Ca(NH 2 BH 3 ) 2 to release hydrogen. In a closed-system thermal decomposition process, hydrogen is liberated in two stages, at ca. 70 °C and 180 °C, … of the dehydrogenation, ca. 6 equiv. (ca. 10.2 wt. %) of hydrogen can be released, giving rise to the formation of CaB …

Small-Pore Hydridic Frameworks Store Densely Packed Hydrogen

February 6, 2024
Author(s)
Hyunchul Oh, Nikolay Tumanov, Voraksmy Ban, Xiao Li, Bo Richter, Matthew Hudson, Craig Brown, Gail Iles, Dirk Wallacher, Scott Jorgensen, Luke Daemen, Rafael Balderas-Xicohtencatl, Yongqiang Cheng, Anibal Ramirez-Cuesta, Michael Heere, Sergio Posada-Perez, Geoffroy Hautier, Michael Hirscher, T. Jensen, Yaroslav Filinchuk
… and a partially negatively charged non-flat interior for hydrogen and nitrogen uptake. Hydrogen and nitrogen occupy distinctly different adsorption … capacities of 2.33 H2 and 0.66 N2 per Mg(BH4)2. Molecular hydrogen is packed extremely densely, with about twice the …

Mg-Fe Thin Films: A Phase-separated Structure with Fast Kinetics of Hydrogenation

September 20, 2012
Author(s)
Shiyou Zheng, Ke Wang, Vladimir Oleshko, Leonid A. Bendersky
… paper we suggest a new approach to improve the kinetics of hydrogenation based on a material with high density of … Pd were prepared by electron beam co-deposition and their hydrogenation/dehydrogenation kinetics and cycling properties … 413 K. The structures of the thin films before and after hydrogenation during different cycles were investigated by …

Antibacterial and physical properties of calcium-phosphate and calcium-fluoride nanocomposites with chlorhexidine

February 6, 2012
Author(s)
Lei Cheng, Michael D. Weir, Hockin H. Xu, Alison M. Kraigsley, Nancy Lin, Sheng Lin-Gibson, Xuedong Zhou
… to (1) develop nanocomposites containing amorphous calcium phosphate (ACP) nanoparticles, calcium fluoride (CaF2) … the novel nanocomposites could not only release calcium phosphate ions to remineralize the existing lesions, release … calcium fluoride, calcium phosphate, caries inhibition, chlorhexidine, dental …

Antibacterial nanocomposites containing amorphous calcium phosphate and silver nanoparticles with different filler levels

May 7, 2012
Author(s)
Lei Cheng, Michael D. Weir, Hockin H. Xu, Joseph M. Antonucci, Nancy Lin, Sheng Lin-Gibson, Sarah M. Xu, Xuedong Zhou
… A dental composite containing amorphous calcium phosphate nanoparticles (NACP) was developed that released high levels of calcium (Ca) and phosphate (PO4) ions and possessed acid neutralization … on incorporation of antibacterial agents into calcium phosphate composites. The objective of this study was to …

Metal Amidoboranes

September 1, 2011
Author(s)
Hui Wu, Wei Zhou, Taner Yildirim
… potential to meet the stringent gravimetric and volumetric hydrogen storage capacity targets needed for transportation … to AB, metal amidoboranes have been shown to release hydrogen at lower temperatures, and at higher rates and with … several metal amidoboarnes also appear to release hydrogen less exothermically than AB. In this chapter, we …

Hydrogen Release and Combustion Measurements in a Full Scale Garage

January 1, 2010
Author(s)
Matthew Blais, Alexandra Joyce
… to support NIST efforts on characterizing the behavior of hydrogen when released into enclosed spaces (e.g. leakage of hydrogen from a fuel-cell powered automobile parked inside a … were designed to characterize both the dispersion of hydrogen and combustion behavior of any flammable mixtures …

Operating Hydrogen Gas Transmission Pipelines at Pressures above 21 MPa

November 12, 2018
Author(s)
Andrew Slifka, Elizabeth S. Drexler, Robert L. Amaro, Peter Bradley, Damian Lauria
… The economical and efficient transportation of hydrogen gas is necessary for it to become a widespread … to improve the economics is to lower the cost of building hydrogen gas pipelines. The recent modification to the ASME B31.12 Code for Hydrogen Piping and Pipelines begins to lower the cost of …

Premixed Rapid-Setting Calcium Phosphate Composites for Bone Repair

January 1, 2005
Author(s)
Lisa E. Carey, Hockin D. Xu, Carl Simon Jr., Shozo Takagi, Laurence C. Chow
… Spell out acronyms on first reference.) Although calcium phosphate cement (CPC) is promising for bone repair, its … Three premixed CPCs were thus developed: CPC-monocalcium phosphate monohydrate (MCPM), CPC-chitosan, and CPC-tartaric. … culture, cytotoxicity, hydroxyapatite, premixed calcium phosphate cement, rapid setting, strength, Dentistry …

Preparation and Certification of Hydrogen in Titanium Alloy Standard Reference Materials

August 4, 2012
Author(s)
Rick L. Paul, Richard M. Lindstrom
… A series of three Hydrogen in Titanium Alloy Standard Reference Materials (SRMs 2452, 2453, and 2454) were prepared with hydrogen mass fractions bracketing the hydrogen specification limit of 125 mg/kg. Commercial … titanium alloys, hydrogen, standard reference materials, activation analysis, …

FATIGUE CRACK GROWTH OF TWO PIPELINE STEELS IN A PRESSURIZED HYDROGEN ENVIRONMENT

October 22, 2013
Author(s)
Andrew J. Slifka, Elizabeth S. Drexler, Nicholas Nanninga, Yaakov Levy, Joseph D. McColskey, Robert L. Amaro
… results were compared with tests conducted in pressurized hydrogen gas. All tests were run at (load ratio) R = 0.5 and … one test on X100, run at 0.1 Hz. Tests were conducted at hydrogen pressures of 1.7 MPa, 7 MPa, 21 MPa, 48 MPa. Fatigue … X100 and X52 were significantly higher in a pressurized hydrogen environment than in air. This enhanced growth rate …

Performance Evaluation of High-Strength Steel Pipelines for High-Pressure Gaseous Hydrogen Transportation

April 1, 2013
Author(s)
Andrew J. Slifka, Elizabeth S. Drexler, Robert L. Amaro, Joseph D. McColskey, Yaoshan Chen, Ming Liu, Yong-Yi Wang
… of their mechanical properties in high-pressure gaseous hydrogen, including their fatigue cracking resistances to … were performed on X52 and X70 steels in both air and hydrogen gas pressurized to 5.5 MPa and 34 MPa. Experimental results indicate that the presence of gaseous hydrogen increases the FCGR of all materials tested. At lower …

Neutron Scattering Studies of Materials for Hydrogen Storage

August 28, 2021
Author(s)
Ryan Klein, Hayden Evans, Benjamin Trump, Terrence J. Udovic, Craig Brown
… Hydrogen storage presents a significant barrier to the widespread adaptation of hydrogen as an energy source in mobile and stationary applications. The development of new candidate hydrogen storage materials is therefore an outstanding goal … hydrogen storage, neutron diffraction, inelastic neutron …

Ab initio kinetic coefficients of gaseous hydrogen

January 9, 2010
Author(s)
James B. Mehl, Marcia L. Huber, Allan H. Harvey
… The spherical portion of the hydrogen intermolecular potential recently determined in ab … and spherical contribution to the thermal conductivity of hydrogen using a full quantum-mechanical formalism. … difference between three experimental data sets for hydrogen spanning 21 314 K was (0.3 1.0)%; the average …

Optimization of the Pore Structures of MOFs for Record High Hydrogen Volumetric Working Capacity

April 28, 2020
Author(s)
Xin Zhang, Rui-Biao Lin, Jing Wang, Bin Wang, Bin Liang, Taner N. Yildirim, Jian Zhang, Wei Zhou, Banglin Chen
… frameworks are promising materials for onboard hydrogen storage thanks to the tunable pore size, pore … structures, the correlation between the pore volume and hydrogen storage capacity is examined and two empirical equations are rationalized to predict the hydrogen storage capacity of MOFs with different pore …

Hydrogen Field Test Standard: Laboratory and Field Performance

November 10, 2015
Author(s)
Jodie G. Pope, John D. Wright
… and measures inspectors to periodically test retail hydrogen dispensers, much as gasoline dispensers are tested … Flow Facility with helium gas and in the field at a hydrogen dispenser location. All three methods agree within … test drafts of helium gas in the laboratory setting and of hydrogen gas in the field, respectively. The time required to …

THE EFFECT OF MICROSTRUCTURE ON THE HYDROGEN-ASSISTED FATIGUE OF PIPELINE STEELS

July 14, 2013
Author(s)
Andrew J. Slifka, Elizabeth S. Drexler, Robert L. Amaro, Damian S. Lauria, April Stevenson, Douglas G. Stalheim, Louis E. Hayden
… fatigue tests were performed at 5.5 and 34 MPa pressurized hydrogen gas, at 1 Hz and (load ratio) R=0.5. At high pressures of hydrogen and high values of the stress intensity range (ΔK) … fatigue, hydrogen, hydrogen embrittlement, microstructure, pipeline steel, X52, …
Displaying 151 - 175 of 1646
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