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Chemistry

Analytical chemistry

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  • Published Date
Displaying 701 - 725 of 2094

Viscosity Measurements of Aviation Turbine Fuels

September 3, 2015
Author(s)
Tara J. Fortin, Arno D. Laesecke
Kinematic viscosity has been measured for nine separate aviation turbine fuel samples. The nine samples span the range of fuel types available: conventional petroleum-derived fuels, synthetic fuels derived from the Fischer-Tropsch process, and renewable

Correction for stray light in optical spectroscopy of crystals

September 1, 2015
Author(s)
Richard W. Hendler, Curtis Meuse, David Travis Gallagher, Joerg Labahn, Jan Kubicek, Paul D. Smith, John W. Kakareka
It has long been known in spectroscopy that light not passing through a sample, but reaching the detector (i.e. stray light) results in a distortion of the spectrum known as absorption- flattening. In spectroscopy with crystals, one must either include

Muffin tin potentials in EXAFS analysis

September 1, 2015
Author(s)
Bruce D. Ravel
Muffin tin potentials are the standard tool for calculating the potential surface of a cluster of atoms for use in the analysis of extended x-ray-absorption fine-structure (EXAFS) data. The set of Cartesian coordinates used to define the positions of atoms

Performance of a dual Fabry-Perot cavity refractometer

August 18, 2015
Author(s)
Patrick F. Egan, Jack A. Stone Jr., Jay H. Hendricks, Jacob E. Ricker, Gregory E. Scace, Gregory F. Strouse
We have built and characterized a refractometer that utilizes two Fabry-Perot cavities formed on a dimensionally stable spacer. In the typical mode of operation, one cavity is held at vacuum and the other cavity is filled with nitrogen gas. The

Dew-point Measurements For Water In Compressed Carbon Dioxide

August 6, 2015
Author(s)
Christopher W. Meyer, Allan H. Harvey
When transporting CO2 for sequestration, it is important to know the water dew point in order to avoid condensation that can lead to corrosion. We have constructed a flow apparatus to measure the water content at saturation in a compressed gas. A saturator

Photovoltaic switching mechanism in lateral structure hybrid Perovskite solar cells

August 5, 2015
Author(s)
Yongbo Yuan, Jungseok Chae, Yuchuan Shao, Qi Wang, Zhengguo Xiao, Andrea Centrone, Jinsong Huang
Organometal trihalide perovskite solar cells with lateral device architecture recently attracted interest because of their switchable photovoltaic effect, which potentially could be leveraged to realize transparent-electrode-free solar cells. However, the

Development of an Ultra-Pure, Carrier-Free 209Po Solution Standard

July 23, 2015
Author(s)
Ronald Colle, Ryan P. Fitzgerald, Lizbeth Laureano-Perez
Ultra-pure, carrier-free 209Po solution standards have been prepared and standardized for their massic alpha-particle emission rate. The standards, which will be disseminated by the National Institute of Standards and Technology (NIST) as Standard

Infrared Imaging and Spectroscopy Beyond the Diffraction Limit

July 22, 2015
Author(s)
Andrea Centrone
Progress in nanotechnology is enabled by and dependent on the availability of measurement methods with spatial resolution commensurate with nanomaterials’ length scales. Chemical imaging techniques, such as scattering scanning near-field optical microscopy

Direct Measurement of Trace Polycyclic Aromatic Hydrocarbons in Diesel Fuel with 1H and 13C NMR Spectroscopy: Effect of PAH Content on Fuel Lubricity

June 17, 2015
Author(s)
Peter Y. Hsieh, Jason Widegren, Andrew Slifka, Andrew J. Hagen, Ronald A. Rorrer
Surface-active trace compounds present in diesel fuels protect pumps and injectors against premature wear through boundary lubrication. Due to the vast number of hydrocarbon compounds found in petroleum distillate fuels, it is difficult to measure the

Analysis of Several High-Resolution Bands of Spiropentane, C5H8

June 15, 2015
Author(s)
Alfons Weber, A. Maki, J. E. Price, Jared Harzan, J. W. Nibler, T. Masiello, T Blake
The high resolution absorption spectrum of spiropentane (C5H8) from 200 cm-1 to 4000 cm−1 has been measured and a detailed analysis is presented for eight bands in the region from 700 cm−1 to 2200 cm−1. Two fundamental perpendicular bands were analyzed

COMMON SPURIOUS SIGNALS OBSERVED IN MASS SPECTROMETERS

June 1, 2015
Author(s)
Thomas J. Bruno, Paris D. Svoronos-Cambanas
The following table provides guidance in the recognition and interpretation of spurious signals (m/z peaks) that will sometimes be observed in mass spectra, especially mass spectra obtained from gas chromatography mass spectrometry systems (GC-MS) [1,2]

SOLID PHASE MICROEXTRACTION SORBENTS

June 1, 2015
Author(s)
Thomas J. Bruno, Paris D. Svoronos Cambanas
While trapping sorbents have been used for many years in headspace analysis (most commonly with gas chromatography), the modern techniques of solid phase microanalysis (SPME) are particularly applicable to survey analyses [1]. In the following tables, we

STATIONARY PHASES FOR POROUS LAYER OPEN TUBULAR COLUMNS

June 1, 2015
Author(s)
Thomas J. Bruno, Paris D. Svoronos Cambanas
The practical application of solid adsorbents in capillary chromatography typically makes use of porous layer open tubular (PLOT) columns. Early capillary PLOT columns suffered from detector spiking due to particulates becoming dislodged and entering the
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