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Author: jack douglas

Displaying records 11 to 20 of 222 records.
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11. Capillary Instability in Nanoimprinted Polymer Films
Published: 5/21/2009
Authors: Kyle J. Alvine, Yifu Ding, Hyun W. Ro, Brian C. Okerberg, Alamgir Karim, Christopher L Soles, Jack F Douglas
Abstract: Capillary forces play an active role in defining the equilibrium structure of nanoscale structures. This effect can be especially pronounced in soft materials such as polymers near or above their glass transition temperatures where material flow is ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852751

12. Grain boundaries exhibit the dynamics of glass-forming liquids
Published: 5/12/2009
Authors: James A Warren, Jack F Douglas, Hao Zhang, David J Srolovitz
Abstract: Polycrystalline materials are composites of crystalline particles or grains separated by thin amorphous grain boundaries (GBs). Although GBs have been exhaustively investigated at low temperatures, at which these regions are relatively ord ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901918

13. Equilibrium Polymerization Models of Reentrant Self-Assembly
Published: 4/24/2009
Authors: Jacek Dudowicz, Jack F Douglas, Karl Freed
Abstract: As is well known, liquid-liquid phase separation can occur either upon heating or cooling, corresponding to lower and upper critical solution phase boundaries, respectively. Likewise, self-assembly transitions from a monomeric state to an organized ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901053

14. 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

15. Competition Between Self-Assembly and Surface Adsorption
Published: 2/25/2009
Authors: Jacek Dudowicz, Jack F Douglas, Karl Freed
Abstract: We investigate a minimal equilibrium polymerization model of the general competition between self-assembly on a boundary and in solution that arises when an assembling system is near a boundary. Adsorption generally occurs upon cooling, but assembly ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854465

16. Particle Motion During the Compaction of Granular Matter
Published: 12/19/2008
Authors: Steven Slotterback, Masahiro Toiya, Leonard Goff, Jack F Douglas, Wolfgang Losert
Abstract: We track particle motions in a granular material subjected to compaction using a laser scattering based imaging method where compaction is achieved through thermal cycling. Particle displacements in this jammed fluid correlate strongly with rearrangm ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853585

17. Nanoscale thermal mechanical probe determination of softening transitions in thin polymer films
Published: 11/19/2008
Authors: Jing N. Zhou, Jack F Douglas, Alamgir Karim, Chad R Snyder, Christopher L Soles, Brian Berry
Abstract: We report a quantitative study of softening behavior of glassy polystyrene (PS) films at the 100 nm length scales using nano-thermomechanometry (nano-TM), an emerging scanning probe technique where a highly-doped silicon AFM tip is resistively heated ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854052

18. MEASUREMENT OF COMPLEX CONDUCTIVITY IN CARBON NANOTUBE POLYMER COMPOSITES UNDER MECHANICAL SHEAR
Published: 11/14/2008
Authors: Jan Obrzut, Jack F Douglas
Abstract: We measured the complex conductivity of carbon nanotube-polypropylene composites under mechanical shear conditions. In order to determine how flow alters the properties of these complex fluids we constructed a rheo-dielectric test fixture, which allo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854127

19. Self-Assembly in a Polymer Matrix and its Impact on Phase Separation
Published: 11/11/2008
Authors: Jack F Douglas, Jacek Dudowicz, Karl Freed
Abstract: Molecular self-assembly often occurs in the presence of long chain polymers, and we develop a theory to describe the competition between self-assembly and phase separation that gen- erally occurs in these complex uids. The theory includes a descr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854076

20. Molecular Simulation of the Swelling of Polyelectrolyte Gels by Monovalent and Divalent Counterions
Published: 10/16/2008
Authors: De-Wei Yin, Jack F Douglas, J J de Pablo
Abstract: In this study we examine the volumetric properties of such polyelectrolyte gels in relation to the progressive substitution of monovalent counterions by divalent counterions as the gels are equilibrated in solvents of different dielectric qualities. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853582



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