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Author: william wallace

Displaying records 21 to 30 of 95 records.
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21. Reactive MALDI Mass Spectrometry: Application to High Mass Alkanes and Polyethylene
Published: 8/21/2007
Author: William E Wallace III
Abstract: A molecular solid of fullerene (C60) intercalated with cobalt cyclopentadienyl dicarbonyl (CoCp(CO)2) was shown to be an effective matrix for matrix-assisted laser desorption/ionization mass spectrometry (MALDI) of large alkanes (demonstrated up to C ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852762

22. Degradation of Polymeric Ballistic Materials
Published: 6/7/2007
Authors: Eun S. Park, Kathleen M. Flynn, Gale Antrus Holmes, Charles Martin Guttman, William E Wallace III
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854067

23. Numerical Optimization of Matrix-Assisted Laser Desorption/Ionization Time-of- Flight Mass Spectrometry: Application to Synthetic Polymer Molecular Mass Distribution Measurement
Published: 5/26/2007
Authors: William E Wallace III, Charles Martin Guttman, Kathleen M. Flynn, Anthony J Kearsley
Abstract: A novel approach is described for the selection of optimal instrument parameters that yield a mass spectrum which best replicates the molecular mass distribution of a synthetic polymer. The application of implicit filtering algorithms is shown to be ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852703

24. Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry of Covalently-Cationized Polyethylene as a Function of Sample Temperature
Published: 1/1/2007
Authors: William E Wallace III, William R. Blair
Abstract: A pre charged, low mass, low polydispersity linear polyethylene was analyzed with matrix assisted laser desorption/ionization (MALDI) mass spectrometry as a function of sample temperature between 25 C and 150 C. This temperature range crosses the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852704

25. Development of NIST SRM 2881, an Absolute Molecular Mass Distribution Polymer Standard
Published: 9/1/2006
Authors: William E Wallace III, Charles Martin Guttman, Kathleen M. Flynn, Anthony J Kearsley
Abstract: We present a strategy to create an absolute molecular mass distribution polymer Standard Reference Material. To create a standard our methods must be free of operator bias (intentional or unintentional). The steps include sample preparation, instrume ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852655

26. Report on the 4th Annual NIST Polymer Mass Spectrometry Workshop: Future Directions in Soft Ionization of Polymers
Published: 1/10/2006
Author: William E Wallace III
Abstract: This year s annual workshop on polymer mass spectrometry was on the topic of Future Directions in Soft Ionization of Polymers . The workshop was sponsored by the Polymers Division of the National Institute of Standards and Technology (NIST) and fol ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852574

27. Report On The 4Th Annual Nist Polymer Mass Spectrometry Workshop: 'Future Directions In Soft Ionization Of Polymers'
Published: 1/1/2006
Author: William E Wallace III
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853986

28. Investigating the Environmental Stability of Ballistic Fibers Using Model Compounds and Mass Spectrometry
Published: 9/1/2005
Authors: Kathleen M. Flynn, William E Wallace III, Charles Martin Guttman, Gale Antrus Holmes, Mark Arnould
Abstract: Metrologies and predictive models to test and predict the long-term reliability of polymers used in ballistic resistant armor are presented.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852523

29. Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry Interlaboratory Comparison of Mixtures of Polystyrene With Different End Groups: Statistical Analysis of Mass Fractions and Mass Moments
Published: 7/1/2005
Authors: Charles Martin Guttman, S Wetzel, Kathleen M. Flynn, B M Fanconi, David Lloyd VanderHart, William E Wallace III
Abstract: A matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) interlaboratory comparison was conducted on mixtures of synthetic polymers having the same repeat unit and closely matching molecular mass distributions but ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852470

30. 2,5-Dihydroxybenzoic Acid: Laser Desorption/Ionisation as a Function of Elevated Temperature
Published: 3/1/2005
Authors: William E Wallace III, Mark Arnould, R Knochenmuss
Abstract: The temperature dependence of laser desorption/ionization (LDI) ion yields has been measured for 2,5-dihydroxybenzoic acid (2,5-DHB) single crystals from room temperature to 160 C using time-of-flight mass spectrometry. A steep rise in ion producti ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852380



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