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You searched on: Topic Area: Chemistry

Displaying records 1 to 10 of 845 records.
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1. Near-field microwave microscopy of one-dimensional nanostructures
Topic: Chemistry
Published: 5/23/2016
Authors: Samuel Berweger, Paul T Blanchard, Rebecca C Quardokus, Frank W DelRio, Thomas M Wallis, Pavel Kabos, Sergiy Krylyuk, Albert Davydov
Abstract: With the ability to measure sample conductivity with nanometer spatial resolution, scanning microwave microscopy (SMM) is a powerful tool to study nanoscale electronic systems and devices. Here we demonstrate the general capability to image elect ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=920089

2. Towards a dynamic pressure standard based on laser absorption spectroscopy
Topic: Chemistry
Published: 5/20/2016
Authors: Kevin O Douglass, Douglas A Olson
Abstract: We describe an approach for creating a cost-effective, field deployable dynamic pressure standard based on measurement of fundamental quantum properties of molecular systems. From the linewidth and intensities of ro-vibrational transitions we pl ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=919384

3. Speed of Sound Measurements in (Argon + Carbon Dioxide) over the Temperature Range from (275 to 500) K at Pressures up to 8 MPa
Topic: Chemistry
Published: 3/23/2016
Authors: Mark O McLinden, Richard A Perkins, Robin Wegge, Markus Richter, Roland Span
Abstract: The speed of sound of two (argon + carbon dioxide) mixtures was measured over the temperature range from (275 to 500) K with pressures up to 8 MPa utilizing a spherical acoustic resonator. The compositions of the gravimetrically prepared mixtures wer ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=919629

4. Predicting Structures of Ru-Centered Dyes: A Computational Screening Tool
Topic: Chemistry
Published: 3/16/2016
Authors: Lisa Ann Fredin, Thomas C Allison
Abstract: Dye-sensitized solar cells (DSCs) represent a viable means for harvesting solar energy to produce electrical power. Though a number of light harvesting dyes are in use, the search continues for more efficient and effective compounds to make commercia ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=919553

5. Spontaneous growth of GaN nanowire nuclei on N- and Al-polar AlN: A piezoresponse force microscopy study of crystallographic polarity
Topic: Chemistry
Published: 3/2/2016
Authors: Matthew David Brubaker, Alexana Roshko, Paul T Blanchard, Todd E Harvey, Norman A Sanford, Kristine A Bertness
Abstract: The polarity of gallium nitride (GaN) nanowire nuclei grown on AlN layers was studied by piezoresponse force microscopy (PFM). N- or Al-polar AlN layers were grown by molecular beam epitaxy (MBE) on Si (111) substrates by use of Al- or N-rich gr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=919689

6. Near-field control and imaging of free charge carrier variations in GaN nanowires
Topic: Chemistry
Published: 2/15/2016
Authors: Samuel Berweger, Paul T Blanchard, Matthew David Brubaker, Kevin J Coakley, Norman A Sanford, Thomas M Wallis, Kristine A Bertness, Pavel Kabos
Abstract: Despite their uniform crystallinity, the shape and faceting of semiconducting nanowires (NWs) can give rise to variations in structure and associated electronic properties. Here we investigate local variations in electronic structure across indiv ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=919566

7. Polarity-Controlled GaN/AlN Nucleation Layers for Selective-Area Growth of GaN Nanowire Arrays on Si(111) Substrates by Molecular Beam Epitaxy
Topic: Chemistry
Published: 12/18/2015
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: We have demonstrated dramatic improvement in the quality of selective-area GaN nanowire growth by controlling the polarity of the underlying nucleation layers. In particular, we find that N- polarity is beneficial for the growth of large ordered n ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917880

8. Thermodynamic Properties of Polycyclic Aromatic Hydrocarbons
Series: Special Publication (NIST SP)
Report Number: 1186
Topic: Chemistry
Published: 12/16/2015
Authors: Thomas C Allison, Donald R Burgess Jr.
Abstract: Polycyclic aromatic hydrocarbons (PAHs) are molecules that exist on earth due to natural and man-made causes. They are a significant health concern as many PAH compounds are known to be carcinogenic. PAHs are generally thermodynamically stable ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917267

9. First far-infrared high resolution analysis of the nu6 band of phosgene 35Cl2CO and 35Cl37CLCO
Topic: Chemistry
Published: 11/2/2015
Author: Walter Joseph Lafferty
Abstract: A Fourier transform spectrum of phosgene (Cl2CO) has been recorded in the 22.5 μm spectral region at a resolution of 0.00102 cm-1 using a Bruker IFS125HR spectrometer coupled with synchrotron radiation leading to the observation of the ν ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=919207

10. Thermal Signature Measurements for Ammonium Nitrate/Fuel Mixtures by Laser Heating
Topic: Chemistry
Published: 11/1/2015
Author: Cary Presser
Abstract: Measurements were carried out to obtain thermal signatures of several ammonium nitrate/fuel (ANF) mixtures, using a laser-heating technique referred to as the laser-driven thermal reactor (LDTR). The mixtures were ammonium nitrate (AN)/kerosene, AN/ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918336



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