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Displaying records 31 to 40 of 221 records.
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31. Crystallization of Poly(ethylene oxide) on Topographically Patterned Substrates
Published: Date unknown
Authors: Brian C. Okerberg, Christopher L Soles, Jack F Douglas, Alamgir Karim
Abstract: Crystallization of poly(ethylene oxide) (PEO) on topographically patterned substrates is investigated. Primary nucleation was dramatically enhanced during solvent drying on patterned substrates compared to flat films. The nucleation density also in ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852757

32. Crystallization of Polyethylene Oxide Patterend by Nanoimprint Lithography
Published: 3/28/2007
Authors: Brian C. Okerberg, Christopher L Soles, Jack F Douglas, Hyun Wook Ro, Alamgir Karim
Abstract: The crystallization behavior of poly(ethylene oxide) (PEO) films patterned by nanoimprint lithography is studied. The imprinted PEO film consists of parallel lines, approximately 240 nm wide and 320 nm tall, on a 400 nm pitch with a residual laye ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852701

33. Crystallization-Induced Fluid Flow in Polymer Melts Undergoing Solidification
Published: 2/19/2007
Authors: Donghua Xu, Z G Wang, Jack F Douglas
Abstract: The formation of semi-crystalline plastic polymer materials often occurs under confinement conditions where high pressure imprinting or casting in a mold are involved. To gain insight into this highly non-equilibrium process, we examine the nature ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852674

34. Dendritic Crystallization in Thin Films of PEO/PMMA Blends: A Comparison to Crystallization of Small Molecule Liquids
Published: Date unknown
Authors: Brian C. Okerberg, H Marand, Jack F Douglas
Abstract: Dendritic crystallization of PEO/PMMA thin films is reported. The film thickness is kept constant while the PMMA molar mass and blend composition are varied. Some basic features of dendritic growth, such as the diffusion length and tip curvature ar ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852771

35. Determination of the Dielectric Constant of Nanoparticles. 1. Dielectric Measurements of Buckminsterfullerene Solutions
Published: 1/1/2000
Authors: Chad R Snyder, Jack F Douglas
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853669

36. Determination of the Dielectric Constant of Nanoparticles. I. Dielectric Measurements of Buckminsterfullerene Solutions
Published: 11/1/2000
Authors: Chad R Snyder, Jack F Douglas
Abstract: The static dielectric constant {epsilon} of buckminsterfullerene C^d60^ particles is determined in cis-decalin, toluene, and 1,2-dichlorobenzene using continuum models for spherical and sherical shell inclusions. The value for {epsilon} for isolated ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851739

37. Dielectric Spectroscopy Investigation of Relaxation in C60-Polyisoprene Nanocomposites
Published: 3/23/2009
Authors: Yifu Ding, Sebastian Pawlus, Alexei Sokolov, Jack F Douglas, Alamgir Karim, Christopher L Soles
Abstract: We investigate the influence of adding C60 nanoparticles on the dielectric relaxation spectra of both unentangled and entangled polyisoprene (PIP). Relaxation modes corresponding to both segmental and chain relaxation were analyzed over a broad tempe ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900194

38. Dielectric Study of the Anti-Plasticization of Trehalose by Glycerol
Published: 1/1/2006
Authors: A Anopchenko, Tatiana Psurek, David Lloyd VanderHart, Jack F Douglas, Jan Obrzut
Abstract: Recent measurements have suggested that the antiplasticizing effect of glycerol on trehalose can significantly increase the preservation times of proteins stored in this type of preservative formulation. In order to better understand the physical ori ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852572

39. Direct Computation of Characteristic Temperatures and Relaxation Times for Glass-Forming Polymer Liquids
Published: 9/1/2005
Authors: J Dudowicz, Karl Freed, Jack F Douglas
Abstract: Characteristic temperatures and structural relaxation times for different classes of glass-forming liquids have been computed using a revised entropy theory of glass-formation that permits the chain backbone and side-groups to have different rigiditi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852453

40. Direct Measurement of the Counterion Distribution Within Swollen Polyelectrolyte Films
Published: 7/19/2005
Authors: Vivek M Prabhu, B D. Vogt, Wen-Li Wu, Eric K Lin, Jack F Douglas, Sushil K Satija, D L Goldfarb, H Ito
Abstract: The depth profile of the counterion concentration within thin polyelectrolyte films was measured in situ using contrast variant specular neutron reflectivity to characterize the initial swelling stage of the film dissolution.Wefind substantial counte ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852397



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