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You searched on: Topic Area: Chemistry Sorted by: date

Displaying records 31 to 40 of 845 records.
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31. Measurement of the Electrostatic Edge Effect in Wurtzite GaN Nanowires
Topic: Chemistry
Published: 11/24/2014
Authors: Alex Henning, Benjamin Klein, Kristine A Bertness, Paul T Blanchard, Norman A Sanford, Yossi Rosenwaks
Abstract: The electrostatic effect of the hexagonal corner on the electronic structure in wurtzite GaN nanowires (NWs) was directly measured using Kelvin probe force microscopy (KPFM). By correlating electrostatic simulations with the measured potential differ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917310

32. Influence of the central mode and soft phonon on the microwave dielectric loss near the strain-induced ferroelectric phase transitions in Sr^dn+1^uTi^dn^uO^d3n+1^u*
Topic: Chemistry
Published: 11/12/2014
Authors: V. Goian, S. Kamba, D Nuzhnyy, Nathan Orloff, T. Birol, C.-H Lee, D. G. Schlom, James C Booth
Abstract: Recently, Lee et al.^u[1]^dused~1% tensile strain to induce a ferroelectic instability in thin films of Sr^dn+1^uTi^dn^uO^d3n+1^u (n=1-6) phases. They showed that the Curie temperature T^dc^u gradually increased with n, reaching 180 K for Sr7Ti6O19 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916484

33. Loss of H2 and CO from Protonated Aldehydes in Electrospray Ionization Mass Spectrometry
Topic: Chemistry
Published: 9/15/2014
Authors: Pedatsur Neta, Yamil Simon, Yuxue Liang, Stephen E Stein
Abstract: Electrospray ionization mass spectrometry of 3-formylchromones and 3-formylcoumarins shows that collision-induced dissociation of the protonated ions results in elimination of H¬¬2 as a major fragmentation route. This loss of H2 yields an unstabl ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913827

34. Degrees of Equivalence for Chemical Measurement Capabilities: Primary pH
Topic: Chemistry
Published: 9/10/2014
Authors: David Lee Duewer, Kenneth W Pratt, Chainarong Cherdchu, Nongluck Tangpaisarnkul2 Nongluck Tangpaisarnkul2, Akiharu Hioki, Masaki Ohata, Petra Spitzer, Michal M?ri?ssy, Leo¿ Vysko¿il
Abstract: The Key Comparison (KC) studies of the Consultative Committee for Amount of Substance ‹ Metrology in Chemistry (CCQM) help ensure the reliability of chemical and biochemical measurements relevant to international trade and environmental , health , an ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912010

35. Selective Area Growth of Ga- and N-polar GaN Nanowire Arrays on Non-Polar Si (111) Substrates
Topic: Chemistry
Published: 9/7/2014
Authors: Matthew David Brubaker, Shannon M.M. Duff, Todd E Harvey, Paul T Blanchard, Alexana Roshko, Aric Warner Sanders, Norman A Sanford, Kristine A Bertness
Abstract: This study presents a technique for obtaining Ga- and N-polar Gallium Nitride nanowire (GaN NW) arrays on non-polar Si (111) substrates by use of polarity-controlled AlN/GaN buffer layers. AlN films are demonstrated to adopt Al-/N-polarity for N ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915866

36. Reference Correlation of the Viscosity of Benzene from the Triple Point to 675 K and up to 300 MPa
Topic: Chemistry
Published: 8/29/2014
Authors: S. Avgeri, Marc J. Assael, Marcia L Huber, Richard A Perkins
Abstract: This paper contains new, representative reference equations for the viscosity of benzene. The equations are based in part upon a body of experimental data that has been critically assessed for internal consistency and for agreement with theory whenev ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916175

37. Membrane protein resistance of oligo(ethylene oxide) self-assembled monolayers
Topic: Chemistry
Published: 7/31/2014
Authors: David J. Vanderah, Marlon L Walker, David Travis Gallagher, Ryan Vierling, Fay Crawshaw
Abstract: Spectroscopic ellipsometry was used to evaluate the resistance to protein adsorption (RPA) of self- assembled monolayers (SAMs) of HS(CH2)3O(CH2CH2O)6M and [HS(CH2)3CH]2O-(CH2CH2O)6M, where M = CH3 or H, on Au. The SAMs were exposed to fibrinogen ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913472

38. Metrology for comparison of displacements at the picometer level
Topic: Chemistry
Published: 7/31/2014
Authors: Jack A Stone Jr., Patrick F Egan, Jay H Hendricks, Gregory F Strouse, Douglas A Olson, Jacob E Ricker, Gregory E Scace, Donavon Gerty
Abstract: An apparatus capable of comparing displacements with picometer accuracy is currently being designed at NIST. In principle, we wish to compare one displacement in vacuum to a second, equal displacement in gas, in order to determine gas refractive inde ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914470

39. Surface and Uniaxial Electrical Measurements on Layered Cementitious Composites having Cylindrical and Prismatic Geometries
Topic: Chemistry
Published: 7/24/2014
Authors: Robert Spragg, Scott Z Jones, Kenneth Alan Snyder, Dale P Bentz, Chiara Villani, Jason Weiss
Abstract: Electrical measurements are becoming a common method to assess the transport properties of concrete. For a saturated homogenous system, the surface resistance and the uniaxial resistance measurements provide equivalent measures of resistivity once g ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915854

40. Dielectric characterization by microwave cavity perturbation corrected for non-uniform fields
Topic: Chemistry
Published: 7/23/2014
Authors: Nathan D Orloff, Jan Obrzut, Christian J Long, Thomas F. Lam, James C Booth, David R Novotny, James Alexander Liddle, Pavel Kabos
Abstract: The non-uniform fields that occur due to the slot in the cavity through which the sample is inserted and those due to the sample geometry itself decrease the accuracy of dielectric characterization by cavity perturbation at microwave frequencies. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915011



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