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Chemistry

Analytical chemistry

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Displaying 1101 - 1125 of 2094

Development of a Candidate Reference Measurement Procedure for the Determination of Phenytoin, Phenobarbital, Lamotrigine, and Topiramate in Human Serum Using Isotope-Dilution Liquid Chromotography/Tandem Mass Spectrometry

August 28, 2011
Author(s)
Susan Tai, Karen W. Phinney, Chia-Yi Yeh
Phenytoin (PHT), phenobarbital (PHB), lamotrigine (LTG), and topiramate (TPM) are some of the most widely used antiepileptic drugs (AEDs). Monitoring of their concentrations in serum is important for the treatment of epilepsy. A candidate reference

Electron-exchange assisted photon energy up-conversion in thin films of ?-conjugated polymeric composites

August 4, 2011
Author(s)
Panagiotis Keivanidis, Frederic Laquai, Joseph W. Robertson, Baluschev Stanislav, Josemon Jacob, Klaus Mullen, Gerhard Wegner
The mechanism of triplet-triplet annihilation (TTA) induced up-converted delayed luminescence is studied in two different binary organic systems consisting of platinum(II) octaethyl porphyrin mixed with either poly(fluorene) (PF26) or ladder-type

A fitting program for molecules with two inequivalent methyl tops and a plane of symmetry at equilibrium. Application to new microwave and millimeter-wave measurements in methyl acetate

July 25, 2011
Author(s)
Marcela Tudorie, Isabelle Kleiner, Jon T. Hougen, Sonia Melandri, Lilian Sutikdja, Wolfgang Stahl
A program for fitting the high-resolution torsion-rotation spectra of molecules having two inequivalent methyl rotors and a plane of symmetry at equilibrium is described and then applied to methyl acetate [CH3-O-C(=O)-CH3]. The G18 permutation-inversion

In Situ Gas Phase Measurements During Metal Alkylamide Atomic Layer Deposition

July 12, 2011
Author(s)
James E. Maslar, William A. Kimes, Brent A. Sperling
Metal alkylamide compounds, such as tetrakis(ethylmethylamido) hafnium (TEMAH), represent a technologically important class of metalorganic precursors for the deposition of metal oxides and metal nitrides via atomic layer deposition (ALD) or chemical vapor

Evaluating the characteristics of multiwall carbon nanotubes

July 1, 2011
Author(s)
John H. Lehman, M. Terrones, Elisabeth Mansfield, Katie Hurst, Vincent Muenier
During the past 20 years, multiwall carbon nanotubes (MWCNTs) have become an important industrial material. Hundreds of tons are produced each year. This review is a survey of the scientific literature, motivated by industrial requirements and guidelines

Mass Spectrometry Characterization for Chemoenzymatic Glycoprotein Synthesis

July 1, 2011
Author(s)
John E. Schiel, Mark S. Lowenthal, Karen W. Phinney
Glycoproteins exist as heterogeneous mixtures of glycoforms due to glycosylation at multiple sites with various glycans. The glycosylation pattern has significant implications for clinical diagnostics and biopharmaceutical development because it affects

Quantitative Determination of Competitive Molecular Adsorption on Gold Nanoparticles Using Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy

June 28, 2011
Author(s)
De-Hao D. Tsai, Melissa Davila-Morris, Frank W. DelRio, Suvajyoti S. Guha, Vincent A. Hackley, Michael R. Zachariah
Surface-sensitive quantitative studies of competitive molecular adsorption on nanoparticles were conducted using a modified Attenuated attenuated Total total Reflectionreflectance-Fourier Transform transform Infrared infrared (ATR-FTIR) spectroscopy method

Violation of the Condon Approximation in Semiconducting Carbon Nanotubes

June 28, 2011
Author(s)
Ming Zheng
A long-held but untested fundamental assumption in Raman spectroscopy of carbon nanotubes is that intensities arising from resonance with incident and scattered photons are equal. We present here the first complete Raman excitation profiles (REPs) for the

PDH-locked, frequency-stabilized cavity ring-down spectrometer

June 16, 2011
Author(s)
Joseph T. Hodges, A. Cygan, Piotr Maslowski, Katarzyna E. Bielska, S. Wojtewicz, J. Domyslawska, Hisashi Abe, R.S. Trawinski, R. Ciurylo
We describe a high sensitivity and high spectral resolution laser absorption spectrometer based upon the frequency-stabilized cavity ring-down spectroscopy (FS-CRDS) technique. We used the Pound-Drever-Hall (PDH) method to lock the probe laser to the high

Controlled Vapor Deposition Approach to Generating Surface Energy/Chemistry Gradients

June 9, 2011
Author(s)
Julie N. Albert, Joey D. Kim, Christopher Stafford, Thomas H. Epps
Substrate surface energy/chemistry gradients provide a means for high-throughput exploration of the surface interactions that are important for many chemical and biological processes. We describe the implementation of a controlled vapor deposition approach

Bridging the Micro to Macro Gap: A New Application for Milli-probe X-ray Fluorescence

June 1, 2011
Author(s)
Jeffrey M. Davis, Dale E. Newbury, Nicholas W. Ritchie, Edward P. Vicenzi, Dale P. Bentz, Albert J. Fahey
X-ray elemental mapping and x-ray spectrum imaging are powerful microanalytical tools. However, their scope is limited spatially by the raster area of a scanning electron microscope or microprobe. Limited sampling size becomes a significant issue when

Electromagnetic Metrology on Concrete and Corrosion

June 1, 2011
Author(s)
Sung Kim, Jack T. Surek, James R. Baker-Jarvis
To go beyond current electromagnetic nondestructive evaluation (NDE) methods for reinforcing bar (rebar) corrosion we are exploring unique magnetic or electric spectral features and whether these might be prominent enough at the concrete cover depth to

Mimicking Biological Design & Computing Principles in Artificial Olfaction

May 27, 2011
Author(s)
Baranidharan Raman, Stephen Semancik
Biology has been an inspiration for designing solutions to many engineering problems including chemical sensing. Modern approaches to chemical sensing have been based on the biological principle of combining cross-selective chemical sensors with a pattern
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