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Chemistry

Analytical chemistry

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Displaying 701 - 725 of 2086

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

Raman and Infrared spectra of the ?1 band of oxirane

May 14, 2015
Author(s)
Walter J. Lafferty, Jean-Marie Flaud, F. K. Kwabia Tchana
Fourier transform spectra of oxirane (ethylene oxide, c-C2H4O) have been recorded in the 3.17 μm - 3.5 μm region with a resolution of 0.005 cm-1. In addition, a Raman spectrum covering the same spectral region was recorded at a resolution of 0.44 cm-1

Thermal Analysis of Nanoparticles: Methods, Kinetics and Recent Advances

May 4, 2015
Author(s)
Elisabeth Mansfield
This chapter will provide an overview of the thermal techniques available to study nanoparticles, including thermogravimetric analysis, calorimetry and differential scanning calorimetry. The use of thermoanalysis for the measurement of nanoparticle purity

Chemically-Sensitive Bioimaging with Coherent Raman Scattering

April 29, 2015
Author(s)
Charles H. Camp, Marcus T. Cicerone
Raman scattering provides an intrinsic fingerprint of chemical composition. Spontaneous Raman spectroscopy has been used for many decades to interrogate biological materials and systems, but is not widely used for imaging due to relatively slow signal

Electron Spin Resonance Scanning Probe Spectroscopy for Ultra-Sensitive Biochemical Studies

April 22, 2015
Author(s)
Jason P. Campbell, Jason T. Ryan, Pragya R. Shrestha, Zhanglong Liu, Canute I. Vaz, Jihong Kim, Vasileia Georgiou, Kin P. Cheung
Electron spin resonance (ESR) spectroscopy’s affinity for detecting paramagnetic free radicals, or spins, has been increasingly employed to examine a large variety of biochemical interactions. Such paramagnetic species are broadly found in nature and can

Perfluorinated Alkyl Acids in Wildlife

April 21, 2015
Author(s)
Jessica L. Reiner, Benjamin J. Place
The first measurements of perfluorinated compounds (PFCs) in wildlife from the aqueous and terrestrial environment showed their ubiquitous presence. Since the initial studies in 2001 their presence, distribution, and fate in the environment has broadly

Direct correlation of charge transfer absorption with molecular donor:acceptor interfacial area via photothermal deflection spectroscopy

April 9, 2015
Author(s)
Lee J. Richter, Dean M. DeLongchamp, Natalie Stingelin, Alberto Salleo, Martin Heeney, Aram Amassian, John deMello, James Bannock, Fiona H. Scholes, Scott Watkins, Zhuping Fei, Koen Vandewal
ABSTRACT: Here, we show that the Charge Transfer (CT) absorption signal in bulk (BHJ) solar cell blends, measured by photothermal deflection spectroscopy (PDS), is directly proportional to the density of molecular donor/acceptor interfaces. Since the
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