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Author: william wallace iii

Displaying records 11 to 20 of 95 records.
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11. PEG-HYDROGELS: SYNTHESIS, CHARACTERIZATION, AND CELL ENCAPSULATION
Published: 9/15/2009
Authors: Sheng Lin-Gibson, Kaushik Chatterjee, James A. Cooper, William E Wallace III, Matthew Becker, Carl George Simon Jr, Ferenc Horkay
Abstract: A simple reaction to prepare controlled molecular mass (MM) poly(ethylene glycol) dimethacrylates (PEGDMs) of high purity and low polydispersity is outlined. PEGDMs were photo-polymerized to form hydrogels with and without bioactive moieties. The str ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902289

12. A General Method for the Quantitative Measurement of Molecular Mass Distribution by Mass Spectrometry
Published: 9/1/2009
Authors: Eun S. Park, William E Wallace III, Charles Martin Guttman, Kathleen M. Flynn, Mickey Richardson, Gale Antrus Holmes
Abstract: A method is presented to test whether the conversion of the mass spectrum of a polydisperse analyte to its molecular mass distribution is quantitative. Mixtures of samples with different average molecular masses, coupled with a Taylor's expansio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902189

13. Combinatorial Screening of Hydrogel Properties for 3-D Cell Culture: Effect of Stiffness on Encapsulated Osteoblasts
Published: 7/15/2009
Authors: Carl George Simon Jr, Kaushik Chatterjee, Sheng Lin-Gibson, William E Wallace III, Marian F Young
Abstract: A combinatorial method to rapidly screen cell-material interactions in three-dimensional (3-D) culture format was developed for accelerating tissue engineering research. Hydrogels of poly(ethylene glycol) dimethacrylate (PEGDM) with gradients in comp ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901798

14. Quantitative Measurement of the Polydispersity in the Extent of Functionalization of Glass Forming Resorcinarenes
Published: 5/1/2009
Authors: William E Wallace III, Kathleen M. Flynn, Charles Martin Guttman, David Lloyd VanderHart, Vivek M Prabhu, Anuja De Silva, Nelson Felix, Christopher K. Ober
Abstract: The polydispersity in the degree of functionalization for two calix[4]resorcinarenes was determined by measuring their molecular mass distribution with matrix-assisted laser desorption/ionization time of flight mass spectrometry. A mathematical meth ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854457

15. Rapid Screening of Hydrogel Properties for 3D Tissue Culture: Effect of Modulus on Encapsulated Osteoblasts
Published: 4/25/2009
Authors: Kaushik Chatterjee, Sheng Lin-Gibson, Marian F Young, William E Wallace III, Carl George Simon Jr
Abstract: Statement of Purpose: With few successful products in the market despite large investments in tissue engineering research, there is a need to accelerate tissue engineering research. Towards this objective, developing high-throughput platforms to rapi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900245

16. Quantitative Mass Spectrometry and Polydisperse Materials: Creation of an Absolute Molecular Mass Distribution Polymer Standard
Published: 12/12/2008
Authors: Charles Martin Guttman, Kathleen M. Flynn, William E Wallace III, Anthony J Kearsley
Abstract: The certification of an absolute molecular mass distribution polymer Standard Reference Material is described. SRM 2881 is an n octyl initiated, proton terminated, narrow polydispersity, low mass, atactic polystyrene. The absolute molecular mass dis ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854439

17. 2,5-Dihydroxybenzoic Acid: Laser Desorption/Ionization as a Function of Elevated Temperature
Published: 9/11/2008
Authors: William E Wallace III, Mark Arnould, R Knochenmuss
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854007

18. A Report on the Certification of an Absolute Molecular Mass Distribution Polymer Standard: Standard Reference Material 2881
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7512
Published: 9/11/2008
Authors: Charles Martin Guttman, Kathleen M. Flynn, William E Wallace III, Anthony J Kearsley
Abstract: The certification of an absolute molecular mass distribution polymer Standard Reference Material, SRM 2881, is described. SRM 2881 is an n octyl initiated, proton terminated, narrow polydispersity, low mass, atactic polystyrene. The absolute molecul ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854031

19. Lessons Learned From NIST's Two Recent Polymer MS Interlabortaory Comparisons
Published: 9/11/2008
Authors: Kathleen M. Flynn, William E Wallace III, Stephanie J Wetzel, David Lloyd VanderHart
Abstract: Lessons learned from NIST two previously-published round robins are collected in one place and examined for commonalities.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852517

20. 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



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