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Chemistry

Analytical chemistry

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Displaying 1526 - 1550 of 2095

MALDI-TOF MS Characterization of Covalent Cationized Polyethylene

August 1, 2003
Author(s)
Sheng Lin-Gibson, D L. Brunner, David L. VanderHart, Barry J. Bauer, B M. Fanconi, Kathleen M. Flynn, William E. Wallace
MALDI-TOF MS generally uses metal salts to cationize synthetic polymers, such as polystyrene. However, reduced analyte signal often results from complications during the metal ionization processes in the gas phase including competition between the analyte

MALDI-TOF Mass Spectral Characterization of Covalently-Cationized Polystyrene

July 1, 2003
Author(s)
Sheng Lin-Gibson, S Bencherif, Kathryn Beers, H M. Byrd
Bromine terminated, controlled molecular mass polystyrene with narrow polydispersity (Mn 40 000 g/mol, PD = 1.08) was prepared by atom transfer radical polymerization. The bromine end group was subsequently substituted with a phosphonium salt. We report

Advances in Optical Methods for Trace Gas Analysis

May 1, 2003
Author(s)
Pamela M. Chu
The fundamental principles for chemical analysis by optical methods are established. However, only recent advances in instrumentation and spectroscopic techniques have substantially expended the feasibility of routine spectroscopic analysis of gaseous

Isostructural Self-Assembled Monolayers, Part 1. Octadecyl 1-thiaoligo(ethylene oxides)

April 1, 2003
Author(s)
David J. Vanderah, Richard S. Gates, Vitalii I. Silin, D N. Zeiger, John T. Woodward IV, Curtis W. Meuse, Gintaras Valincius, B Nickel
The self-assembled monolayers (SAMs) of a series of octadecyl 1-thiaoligo(ethylene oxide)x disulfides {[S(CH 2CH 2O) xC 18H 37] 2}, where x = 4 to 8, were assembled on gold and characterized by reflection-adsorption infrared spectroscopy (RAIRS)
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