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Topic Area: Chemical Analysis

Displaying records 31 to 40 of 152 records.
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31. TDRM/TDLM Workshop on Reference Materials and Laboratory Accreditation at the AOAC Annual Meeting 2011
Topic: Chemical Analysis
Published: 11/29/2011
Authors: Catherine A Rimmer, Melissa Meaney Phillips, Hendrik Emons, Jane Weitzel, John Budin, Donna Zink

32. Molecular Layer-by-Layer Deposition of Highly Crosslinked Polyamide Membranes for Reverse Osmosis Applications
Topic: Chemical Analysis
Published: 11/19/2011
Authors: Peter M. Johnson, Joonsung (Joonsung) Yoon, Jennifer Y. Kelly, John A. (John A) Howarter, Christopher M Stafford
Abstract: In membranes for reverse osmosis and nanofiltration, the discriminating layers consist of an interfacially polymerized polyamide film on a porous support. For reverse osmosis membranes, the dominant commercial interfacial film is a crosslinked netwo ...

33. Chromatographic Sample Collection from Two Phase (gas + liquid) Flows
Topic: Chemical Analysis
Published: 10/12/2011
Authors: Thomas J Bruno, Bret Windom
Abstract: A particularly challenging sample presentation in analytical chemistry is a flowing stream that consists of both a gas and liquid phase, in the situation in which an analysis is needed for both phases, separately. In these cases, the vapor and liqui ...

34. Compressed-Liquid Density Measurements of Methyl Oleate and Methyl Linoleate
Topic: Chemical Analysis
Published: 9/30/2011
Author: Stephanie L Outcalt
Abstract: Compressed liquid densities of the fatty acid methyl esters methyl linoleate and methyl oleate have been measured with a vibrating-tube densimeter. The temperature and pressure range of the measured data is from 270 K to 470 K, and 0.5 MPa to 50 MPa. ...

35. Assessment of the Composition and Distillation Properties of Thermally Stressed RP-1 and RP-2: Application to Fuel Regenerative Cooling
Topic: Chemical Analysis
Published: 9/28/2011
Authors: Bret Windom, Thomas J Bruno
Abstract: In this work, we measured the volatility of thermally stressed samples of RP-1 and RP-2 rocket kerosenes by use of the advanced distillation curve method. This work is part of a large program at NIST and other laboratories geared toward improving th ...

36. Characterization of Renewable Fuels and Additives with the Advanced Distillation Curve Method
Topic: Chemical Analysis
Published: 8/28/2011
Authors: Thomas J Bruno, Tara M Lovestead, Bret Windom
Abstract: The analysis of complex fluids such as fuels poses significant challenges arising primarily from the multiplicity of components, the different properties of the components (polarity, polarizability, etc) and matrix properties (such as dirty samples). ...

37. Trace Detection and Quantitation of Hydrogen Peroxide Permeation through Polymer Barriers
Series: NIST Interagency/Internal Report (NISTIR)
Topic: Chemical Analysis
Published: 8/1/2011
Authors: Tara M Lovestead, Thomas J Bruno
Abstract: In this paper, a novel apparatus and fluorescence detection method for measuring the permeation of H^d2^O^d2^ through polymer barriers (i.e., plastic bottles, caps, and containers) is presented. Measurements were performed with 35 and 50 % (mass/mas ...

38. Detecting Gravesoil from Headspace Analysis with Adsorption on Short Porous Layer Open Tubular (PLOT) Columns
Topic: Chemical Analysis
Published: 7/23/2011
Authors: Tara M Lovestead, Thomas J Bruno
Abstract: Victims of crimes are often buried in clandestine graves. There are several techniques for finding buried bodies or the scattered remains of a victim; however, none of these methods are very reliable or work in all scenarios. One way to detect grav ...

39. Biosynthetic origin of the 3-amino-2,5,7,8-tetrahydroxy-10-methylundecanoic acid moiety and absolute configuration of pahayokolides A and B
Topic: Chemical Analysis
Published: 6/8/2011
Authors: Li Liu, Daniel W Bearden, Kathleen S. Rein
Abstract: Pahayokolide A is a cyclic undecapeptide from the cyanobacterium Lyngbya sp. The absolute configurations of the amino acids of pahayokolide A have been determined. Pahayokolide A contains the unusual α-hydroxy-β-amino acid, 3-amino-2,5,7, ...

40. Effect of oxidation on surface-enhanced Raman scattering activity of silver nanoparticles: a quantitative correlation
Topic: Chemical Analysis
Published: 6/6/2011
Authors: Yun Han, Robert Lupitskyy, Tseng-Ming Chou, Christopher M Stafford, Henry Du, Svetlana Sukhishvili
Abstract: The effect of silver oxidation on surface-enhanced Raman scattering (SERS) was investigated using citrate-reduced silver nanoparticles (Ag NPs) (45-50 nm in diameter) immobilized on glass substrate. Oxidation of Ag NPs was performed in controlled ozo ...

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