U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 226 - 250 of 1646

Spectroscopic Identification of Hydrogen Spillover Species in Ruthenium-modified High Surface Area Carbons by Diffuse Reflectance Infrared Fourier Transform Spectroscopy

December 17, 2012
Author(s)
Jeffrey L. Blackburn, Chaiwat Engtrakul, Justin B. Bult, Katherine Hurst, Yufeng Zhao, Qiang Xu, Philip A. Parilla, Lin J. Simpson, John-David R. Rocha, Matthew Ross Hudson, Craig Brown, Thomas Gennett
… for their potential application within vehicular hydrogen storage applications. One method by which sorbents have been reported to store appreciable hydrogen at room temperature is via a spillover process: where molecular hydrogen is first dissociated by metal nanoparticle catalysts …

Hydrogen Dynamics in the Hexagonal Ho 2 Fe 17 H 4 and Y 2 Fe 17 H 4.2 : Inelastic and Quasielastic Neutron Scattering Studies

May 28, 2017
Author(s)
A. V. Skripov, O. Isnard, N. V. Mushnikov, P. B. Terent'ev, V. S. Gaviko, Terrence J. Udovic
… The vibrational spectra of hydrogen and the parameters of H jump motion in the hexagonal … and quasielastic neutron scattering. It is found that hydrogen atoms occupying interstitial Ho(Y) 2 Fe 2 sites in … meV, respectively. For Ho 2 Fe 17 H 4 , the localized hydrogen jump motion is found to be the fastest among all R 2 …

Direct Observation of Hydrogen Spillover in Ni-Loaded Pr-Doped Ceria

January 17, 2012
Author(s)
Vaneet Sharma, Peter A. Crozier, Renu Sharma, James B. Adams
… Hydrogen-spillover in Ni-loaded Pr-doped ceria (PDC) was … in terms of surface diffusion properties of atomic hydrogen and oxygen species. … In situ, Pr-doped ceria, reduction zone, hydrogen spillover, ETEM … Direct Observation of Hydrogen Spillover in Ni-Loaded Pr-Doped Ceria …

Direct Observation of Activated Hydrogen Binding to a Supported Organometallic Compound at Room Temperature

April 2, 2012
Author(s)
Jason M. Simmons, Taner Yildirim, Ahmad Hamaed, David M. Antonelli, Michael I. Webb, Charles J. Walsby
… been proposed as a means of achieving room temperature hydrogen storage via Kubas interactions, however there is … theory, we provide direct evidence for Kubas-like metal-hydrogen interactions in a silica-supported Ti(III) … predictions of the efficacy of Kubas bonding for improved hydrogen storage materials. …

Effect of Bifunctional Comonomers on Mechanical Strength and Water Sorption of Amorphous Calcium Phosphate- and Silanized Glass-filled Bis-GMA-Based Composites

August 1, 2003
Author(s)
Drago Skrtic, Joseph M. Antonucci
… dimethacrylate (GDMA) or ethylene glycol methacrylate phosphate (PHEMA). Triethyleneglycol dimethacrylate, a widely … (1) a hydrophilic, silica-modiried amorphous calcium phosphate (Si-ACP) and (2) a more hydrophobic silianized … amorphous calcium phosphate, biaxial flexure, methacrylate composites, …

Determining Steel Weld Qualification and Performance for Hydrogen Pipelines: Phase I Report

May 23, 2023
Author(s)
Matthew Connolly, May Ling Martin, Zack Buck, Newell Moser, Enrico Lucon, Damian Lauria, Peter Bradley, Andrew Slifka, Robert Amaro
… "Determining Steel Weld Qualification and Performance for Hydrogen Pipelines". In this work, the goals of Phase I were … review of steel weld qualification and performance for hydrogen pipelines, 2) to form a committee of industry and … approach to determining weld and HAZ performance for hydrogen pipelines: 1) survey industry for a wide spectrum of …

Effect of Chemical Structure and Composition of the Resin Phase on Mechanical Strength and Vinyl Conversion of Amorphous Calcium Phosphate-Based Composites

March 1, 2004
Author(s)
Drago Skrtic, Joseph M. Antonucci, Walter G. McDonough, D W. Liu
… anti-demineralizaing/remineralizing, amorphous calcium phosphate (ACP)-based composites are in need of improvment. … amorphous calcium phosphate, composite, FTIR microspectroscopy, hybridization, … Strength and Vinyl Conversion of Amorphous Calcium Phosphate-Based Composites …

Understanding and Mitigating the Effects of Stable Dodecahydro-closo-dodecaborate Intermediates on Hydrogen Storage Reactions

October 25, 2016
Author(s)
James L. White, Rebecca J. Newhouse, Jin Z. Zhang, Terrence J. Udovic, Vitalie Stavila
… Alkali metal borohydrides can reversibly store hydrogen; however, the materials display poor cyclability, … effort to understand the role of such intermediates on the hydrogen storage properties of metal borohydrides, several … or borides, albeit under rather harsh conditions of hydrogen pressure and temperature. …

Intramolecular Versus Intermolecular Hydrogen Bonding in the Adsorption of Aromatic Alcohols Onto an Acrylic Ester Sorbent

October 16, 2008
Author(s)
K L. Mardis, B J. Brune, P Vishwanath, B Giorgis, G F. Payne, M K. Gilson
… Intramolecular hydrogen bonds influence the intermolecular binding … Understanding the competition between the two types of hydrogen bonds may result in the ability to design separation … are examined to determine the effect of intramolecular hydrogen bond formation on the binding to ethyl propionate …

Structures of Biological Minerals in Dental Research

December 1, 2001
Author(s)
M Mathew, Shozo Takagi
… kinds and locations of ionic substitutions. Octacalcium phosphate (OCP), is a probable precursor in biological … fluorapatite, glaserite, hydroxyapatite, octacalcium phosphate …

The Role of Hydrogen Bonding in Transition-State Stabilization by Uracil-DNA Glycosylase

February 1, 2000
Author(s)
A C. Drohat
… Escherichia coliuracil DNA glycosylase (UDG) provides a hydrogen bond from a neutral His187 to stabilize the … s-1 and P.F. = 500), and change in 15N chemical shift upon hydrogen bond formation (D d = 10 ppm) indicatethat this is a fairly strong, short hydrogen bond. These findings suggest a general mechanism for …

Fine Tuning and Specific Binding Sites with a Porous Hydrogen-Bonded Metal-Complex Framework for Gas Selective Separations

May 14, 2018
Author(s)
Zongbi Bao, Danyan Xie, Ganggang Chang, Hui Wu, Liangying Li, Wei Zhou, Hailong Wang, Zhiguo Zhang, Huabin Xing, Qiwei Yang, Michaek J. Zaworotko, Qilong Ren, Banglin Chen
… and functional properties are extremely rare due to weak hydrogen-bonding interactions among molecular organic linkers … both the moderately stable coordination bonds in MOFs and hydrogen bonds, we have realized a microporous hydrogen-bonded metallotecton framework HOF -21 , which not …

Hot carriers in epitaxial graphene sheets with and without hydrogen intercalation: role of substrate coupling

July 1, 2014
Author(s)
Randolph E. Elmquist, Chiashain Chuang, Yanfei Yang, Lung-I Huang, Chi-Te Liang
… sheets on 6H-SiC (0001) substrates with and without hydrogen intercalation by driving the device into the … that the energy relaxation time of the device without hydrogen intercalation is two orders of magnitude shorter than that with hydrogen intercalation, suggesting applications of epitaxial …

In Situ Neutron Transmission Bragg Edge and Synchrotron X-Ray Measurement of Strain Fields Near Fatigue Cracks Grown in Hydrogen

April 18, 2018
Author(s)
Matthew J. Connolly, Peter E. Bradley, Damian S. Lauria, Andrew J. Slifka, Elizabeth S. Drexler
… fatigue crack growth rate of metals in the presence of hydrogen is a long-standing problem. In an effort to determine the dominate damage mechanism behind hydrogen assisted fatigue crack growth, we performed … fields near cracks grown both in air as well as in a hydrogen environment. An enhancement in the magnitude and …

Precise Calculation of Transition Frequencies of Hydrogen and Deuterium Based on a Least-Squares Analysis

October 11, 2005
Author(s)
U Jentschura, Svetlana A. Kotochigova, E-O Le Bigot, Peter J. Mohr, Barry N. Taylor
… Theoretical values of transition frequencies of hydrogen and deuterium are given, based on the most accurate … deuterium, energy levels, hydrogen, hydrogenic spectrum, least-squares analysis, … Precise Calculation of Transition Frequencies of Hydrogen and Deuterium Based on a Least-Squares Analysis …

Towards a Predictive, Physics-Based Model of Hydrogen-Assisted Fatigue Crack Growth: Measurements of Strain Fields and Isotope Effects

November 10, 2016
Author(s)
Matthew Connolly, Andrew Slifka, Elizabeth S. Drexler
… A predictive, physics-based model of hydrogen-assisted fatigue crack growth in pipeline steel is … a model with physical data, namely crack tip strains and hydrogen diffusion rates. In this paper, we present … deformation near cracks grown via fatigue in air and in a hydrogen environment. Drastic differences in both magnitude …

Hydrogen-Bonded Complexes in Chloroform: Affinity, Entropy, and Conformation

October 16, 2008
Author(s)
M S. Head, R Luo, J A. Given, M K. Gilson
… binding affinities to study a series of flat, triply hydrogen-bonding molecules in chloroform. Good agreement with … affinity, binding, entropy, free energy, hydrogen bond … Hydrogen-Bonded Complexes in Chloroform: Affinity, Entropy, …

Precise Energies of Highly Excited Hydrogen and Deuterium

November 1, 2002
Author(s)
Svetlana A. Kotochigova, Peter J. Mohr, Barry N. Taylor
… The energy levels of hydrogen and deuterium atoms are calculated to provide … deuterium, energy levels hydrogen, quantum electrodynamics … Precise Energies of Highly Excited Hydrogen and Deuterium …

Cold Neutron Activation Analysis, a Nondestructive Technique for Hydrogen Level Assessment in Zirconium Alloys

June 1, 2012
Author(s)
Rick L. Paul, Adrien Couet, Arthur Motta, Robert Comstock
… of a non-destructive technique to quantitatively assess hydrogen concentration in zirconium alloys. The technique, … and comparing the rate of detection of characteristic hydrogen gamma rays to that of gamma rays from matrix atoms. … a precision of mg.kg-1 (or wt.ppm). Very low levels of hydrogen (as low as 5wt.ppm) can be detected. Also, it is …

Evaluation of the Propensity of Niobium to Absorb Hydrogen During Fabrication of Superconducting Radio Frequency Cavities for Particle Accelerators

October 31, 2010
Author(s)
Richard E. Ricker, Ganapati R. Myneni
… the processing environment. If these reactions produce hydrogen at sufficient concentrations and rates, then hydrogen will be absorbed and diffuse into the metal. High hydrogen activities could result in supersaturation and the … absorption, diffusion, hydrogen, niobium, corrosion, fabrication, superconducting …
Displaying 226 - 250 of 1646
Was this page helpful?