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Displaying records 21 to 30 of 227 records.
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21. 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

22. 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

23. 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

24. 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

25. 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

26. 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

27. Influence of Nanotube Length on the Optical and Conductivity Properties of Thin Single-Wall Carbon Nanotube Networks
Published: 10/10/2008
Authors: Daneesh Olivia Simien, Jeffrey A Fagan, Wei R. Luo, Jack F Douglas, Kalman D Migler, Jan Obrzut
Abstract: Thin layers of length-sorted single wall carbon nanotubes (SWCNT), formed through filtration from a dispersing solvent onto a filter substrate ( buckypaper ), exhibit sharp changes in their optical and conductivity (s) properties with increasing SWCN ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854033

28. Influence of Carbon Nanotube Aspect Ratio on Normal Stress Differences in Isotactic Polypropylene Nanocomposite Melts
Published: 10/1/2008
Authors: Donghua Xu, Z G Wang, Jack F Douglas
Abstract: We consider the impact of varying the aspect ratio A of carbon nanotubes (CNT) on the rheological properties of isotactic polypropylene/CNT nano- composites. Specifically, we focus on multi-wall CNT having a relatively low aspect ratio A (in the rang ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852773

29. Quantifying Changes in the Fast Dynamics of Mixtures by Dielectric Spectroscopy
Published: 9/26/2008
Authors: Tatiana Psurek, Christopher L Soles, Kirt A. Page, Marcus T Cicerone, Jack F Douglas
Abstract: The addition of a solvent or nanoparticles to a polymeric material can lead toappreciable changes in the rates of relaxation and reaction that can profoundly alter material properties and function. We introduce a general theoretical strategy for quan ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853577

30. Influence of Single-Wall Carbon Nanotube Length on the Optical and Conductivity Properties of Thin Buckypaper Films
Published: 9/9/2008
Authors: Daneesh Olivia Simien, Jeffrey A Fagan, Jack F Douglas, Kalman D Migler, Jan Obrzut
Abstract: Thin layers of length-sorted single wall carbon nanotubes (SWNT) were formed in to a buckypaper sample through vacuum filtration. These length sorted samples exhibit sharp changes in their optical and conductivity (S) properties with increasing SWN ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900163



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