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Reductive dimerization and oligomerization of alcohols, ketones, and aldehydes to hydrocarbons on a promoted, fused iron catalyst

July 17, 2014

Author(s)

Anzor I. Mikaia, Leonid S. Glebov, Vladimir G. Zaikin, George A. Kliger

A new reductive dimerization and oligomerization reaction of (C5 and C6) cycloalkanols and cycloalkanones, benzaldehyde, and benzyl alcohol to hydrocarbons containing as many, or more, carbon atoms as the reactant oxygenated compound on a promoted, fused

Low Temperature Plasma for Bevel Crater Depth Profiling of Crosslinking Organic Multilayers: Comparison with C60 and Argon Gas Cluster Sources

July 6, 2014

Author(s)

Shinichiro Muramoto, Derk Rading, Brian G. Bush, John G. Gillen, David G. Castner

A model delta layer system made of thin films of an organometallic chelate and an aromatic molecule (aluminum hydroxyquinolinate and bathocuproine), both that crosslink under traditional ion beam irradiation, was used to evaluate the effectiveness of using

Final report of the key comparison CCQM-K98: Pb isotope amount ratios in bronze

July 1, 2014

Author(s)

Jochen Vogl, Yong-Hyeon Yim, Kyoung-Seok Lee, Heidi Goenaga-Infante, Dmitriy Malinowskiy, Tongxiang Ren, Jun Wang, Robert D. Vocke Jr., Karen E. Murphy, Naoko Nonose, Olaf Rienitz, Janine Noordmann, Teemu Naeykki, Timo Sara-Aho, Bet?l Ari, Oktay Cankur

Isotope amount ratios are proving useful in an ever increasing array of applications that range from studies unravelling transport processes, to pinpointing the provenance of specific samples as well as trace element quantification by using isotope

Mass Spectrometry Detection and Imaging of Organic and Inorganic Explosive Device Signatures using Desorption Electro-Flow Focusing Ionization

June 26, 2014

Author(s)

Thomas Forbes, Edward Sisco

We demonstrate the coupling of desorption electro-flow focusing ionization (DEFFI) with in-source collision induced dissociation (CID) for the mass spectrometric (MS) detection and imaging of explosive device components, including both organic, e.g

Investigating the potential role of persistent organic pollutants in Hawaiian green sea turtle fibropapillomatosis

June 25, 2014

Author(s)

Jennifer M. Lynch

It has been hypothesized for decades that environmental pollutants may contribute to green sea turtle fibropapillomatosis (FP) possibly through immunosuppression leading to greater susceptibility to the herpesvirus, the putative causative agent of this

Measurement Methods for the Oral Uptake of Engineered Nanomaterials from Human Dietary Sources: Summary and Outlook

June 25, 2014

Author(s)

Christopher W. Szakal, Lyubov Tsytsikova, David Carlander, Timothy V. Duncan

This article is one of a series of 4 that report on a task of the NanoRelease Food Additive (NRFA) project of the International. Life Science Institute Center for Risk Science Innovation and Application. The project aims are to identify, evaluate, and

The Predictive Power of the Annellation Theory: The Case of the C32H16 Benzenoid Polycyclic Aromatic Hydrocarbons

June 20, 2014

Author(s)

Jorge O. Ona Ruales, Yosadara Ruiz-Morales

The positions of maximum absorbance for the p and β bands of the UV−vis spectra of the benzenoid polycyclic aromatic hydrocarbons, PAHs, with molecular formula C32H16 have been predicted by means of the annellation theory. In the C32H16 PAH group there are

Photoacoustic Spectrometer for Accurate, Continuous Measurements of Atmospheric Carbon Dioxide Concentration

June 19, 2014

Author(s)

Joseph T. Hodges, Zachary D. Reed, Brent A. Sperling, Roger D. van Zee, James R. Whetstone, Keith A. Gillis

We have developed a portable photoacoustic spectrometer that offers routine, precise and accurate measurements of atmospheric carbon dioxide mixing ratios. The spectrometer is temperature controlled, continuously samples and dries atmospheric air, and

A Demonstration of Fast and Accurate Discrimination and Quantification of Chemically Similar Species Utilizing a Single Cross-Selective Chemiresistor

June 14, 2014

Author(s)

Alexander (. Vergara Tinoco, Kurt D. Benkstein, Christopher B. Montgomery, Stephen Semancik

Performance characteristics of gas-phase microsensors will determine the ultimate utility of these devices for a wide range of chemical monitoring applications. Considerable effort has led to electronic nose devices that utilize multiple cross-selective

Self-terminating electrodeposition of ultrathin Pt films on Ni: An active, low-cost electrode for H2 production

June 14, 2014

Author(s)

Yihua Y. Liu, Carlos M. Hangarter, Thomas P. Moffat

Self-terminating electrodeposition was developed for depositing ultrathin Pt overlayers on segmented electrodeposited Ni films supported on Au. The partitioned substrates provided an internal reference, namely, Pt on Au versus Pt on Ni, for every growth

Flux growth of Yb6.6Ir6Sn16 having mixed valent ytterbium

June 12, 2014

Author(s)

Sebastian Peter, Udumula Subbarao, Sudhindra Rayaprol, Joshua Martin, Mahalingam Balasubramanian, Christos D. Malliakas, Mercouri G. Kanatzidis

The new compound Yb6.6Ir6Sn16 was obtained as single crystals in high yield from the reaction of Yb with Ir and Sn run in excess indium. Single crystal X-ray diffraction analysis shows that Yb6.6Ir6Sn16 crystallizes in the tetragonal space group P42/nmc

3D Characterization of carbon nanotube polymer composites using Scanning Electron Microscopy and Confocal Raman Microscopy

June 11, 2014

Author(s)

Minhua Zhao, Rachel J. Cannara

Scanning Electron Microscopy (SEM) and Confocal Raman Microscopy (CRM) were employed to characterize the 3D state of disperison of carbon nanotubes (CNT) in a polymer matrix. First, non-destructive subsurface imaging on CNT-polymer was conducted by charge

Trace chemical detection in air using electronic noses and nano-structured sensing materials

June 11, 2014

Author(s)

Kurt D. Benkstein, Christopher B. Montgomery, Stephen Semancik

For a variety of application areas, including homeland defense, environmental and health monitoring and emergency response, the detection of gas-phase chemicals is of great interest. One approach to these challenging sensing tasks is to use arrays of

Mid-Infrared Time-Resolved Frequency Comb Spectroscopy of Transient Free Radicals

June 10, 2014

Author(s)

Adam J. Fleisher, Bryce Bjork, Thinh Q. Bui, Kevin C. Cossel, Mitchio Okumura, Jun Ye

Quantitative measurements in chemical kinetics require unambiguous determinations of reactant, intermediate, and product concentrations on time scales faster than the reaction rate. Direct absorption spectroscopy in the mid-infrared (mid-IR) can fulfill

Organic Analytical Reagents for the Determination of Inorganic Ions

June 4, 2014

Author(s)

Thomas J. Bruno, Paris D. Svoronos

The table entitled Organic Analytical Reagents for the Determination of Inorganic Substances, by G. Ackermann, L. Sommer, and D. Thorburn Burns, has been revamped and considerably expanded for this edition. The many recent advancements in this area have

Quality Control for Building Libraries from Electrospray Ionization Tandem Mass Spectra

June 4, 2014

Author(s)

Xiaoyu (Sara) Yang, Pedatsur Neta, Stephen E. Stein

Electrospray ionization (ESI) tandem mass spectrometry coupled with liquid chromatography is a routine technique for identifying and quantifying compounds in complex mixtures. The identification step can be aided by matching acquired tandem mass spectra

CCQM-K83 Draft A Report: International Comparison CCQM-K83 Halocarbons in Dry Whole Air

June 3, 2014

Author(s)

George C. Rhoderick, Franklin R. Guenther, David L. Duewer, Jeongsoon Lee, Jin Seog Kim, Dongmin Moon, Jinbok Lee

The growing awareness of climate change/global warming and continuing concerns regarding stratospheric ozone depletion will require future measurements and standards for many compounds, in particular halocarbons that are linked to these issues. In order to

The ABCs of Using Standard Reference Materials in the Analysis of Foods and Dietary Supplements: A Practical Guide

June 2, 2014

Author(s)

Katherine E. Sharpless, David L. Duewer, Katrice A. Lippa, Andrew L. Rukhin

Although nutraceuticals and functional foods seem to be ill-defined terms, both are often used to indicate a food that contains compounds providing benefits beyond basic nutrition, often with the expectation that these compounds are protective against

CCQM-P151 Draft A Report Pilot Study CCQM P151 Halocarbons in Dry Whole Air

May 28, 2014

Author(s)

George C. Rhoderick, Franklin R. Guenther, David L. Duewer, Jeongsoon Lee, Jin S. Kim, Bradley Hall, Ray Weiss, Christina Harth, Stefan Reimann, Martin Vollmer

Microsensors for Mars: Trace Analyte Detection in a Simulated Martian Environment

May 23, 2014

Author(s)

Kurt D. Benkstein, Phillip H. Rogers, Christopher B. Montgomery, C. Jin, Baranidharan Raman, Stephen Semancik

Chemiresistive microsensor arrays are being developed and tested in a simulated Martian environment. Target analyte species include trace small molecules that may indicate current geological or, potentially, biological activity on Mars. The sensing films

Measurement of pHT Values of Tris Buffers in Artificial Seawater at Varying Mole Ratios of Tris:Tris:HCl

May 20, 2014

Author(s)

Kenneth W. Pratt

Measurements of total pH, pHT, in electrochemical cells without transference are reported for 2 amino-2-hydroxymethyl 1,3-propanediol (Tris) buffers in synthetic seawater (SSW) of salinity 35 at three molality ratios of Tris to TrisHCl: 0.03:0.05, 0.04

Chemical Imaging of Artificial Fingerprints by Desorption Electro-Flow Focusing Ionization Mass Spectrometry

May 19, 2014

Author(s)

Thomas Forbes, Edward Sisco

Desorption electro-flow focusing ionization (DEFFI) mass spectrometry was used to image chemical distributions of endogenous, e.g., fatty acids, and trace exogenous compounds, e.g., explosives, narcotics and lotions, in deposited and lifted artificial

Sample Thickness and Quantitative Concentration Measurements in XANES Spectroscopy

May 16, 2014

Author(s)

Alessandra C. Leri, Bruce Ravel

While XANES spectroscopy is an established tool for quantitative information on chemical structure and speciation, elemental concentrations are generally quantified by other methods. The edge step in XANES spectra represents the absolute amount of the

Nanomaterials-Enabled Photonic and Chemiresistive Sensing of Chemicals and Biochemicals

May 12, 2014

Author(s)

Charles J. Choi, Kurt D. Benkstein, Phillip H. Rogers, Christopher B. Montgomery, Stephen Semancik

Contact events occurring between target species and surface sites on sensing materials initiate front-end interactions and subsequent transduction processes that can yield viable signals for target detection. By offering high surface-to-volume ratios, and

Plasmonic nanodome array fabricated on plastic as a dual-mode surface plasmon resonance and surface- enhanced Raman scattering sensor

May 12, 2014

Author(s)

Charles J. Choi, Stephen Semancik

Label-free optical sensors have recently emerged as a highly sensitive approach for detecting a broad range of chemical and biological analytes that include illicit drug compounds, explosives, proteins, viruses, and bacteria.To best meet such diverse