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Displaying records 21 to 30 of 225 records.
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21. 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 ...

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 ...

23. 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 ...

24. 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. ...

25. 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 ...

26. 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 ...

27. 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 ...

28. 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 ...

29. Multi-Step Relaxation in Equilibrium Self-Assembling Solutions: A General Model of Relaxation in 'Complex' Fluids
Published: 9/5/2008
Authors: Evgeny B Stukalin, Jack F Douglas, Karl Freed
Abstract: We examine the rheological and dielectric properties of a solution of equilibrium self-assembling particles that form polydisperse chains whose average length depends on temperature and concentration (free association model). Relaxation of the self-a ...

30. Orientational Order in Block Copoloymer Films Zone Annealed Below the Order-Disorder Transition Temperature
Published: 8/11/2008
Authors: Brian Berry, August W. Bosse, Jack F Douglas, Ronald Leland Jones, Alamgir Karim
Abstract: Cold zone annealing (CZA) is a thermal treatment involving pulling a thin block copolymer (BCP) film over a heated region having a temperature significantly above the glass-transition temperature, but well below the film order-disorder temperature. W ...

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