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Author: jack douglas

Displaying records 21 to 30 of 222 records.
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21. 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 ...

22. 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 ...

23. Quantifying Changes in the Fast Dynamics of Mixtures by Dielectric Spectroscopy
Published: 9/26/2008
Authors: Tatiana Psurek, Christopher L Soles, Kirt Anthony 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 ...

24. 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 ...

25. 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 ...

26. 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 ...

27. Facile Imaging of Giant Meso-Polymers Formed From Polymer Coated Magnetic Nanoparticles Using Fossilized Liquid Assembly
Published: 8/7/2008
Authors: Jason Benkoski, Steven Bowles, Ronald Leland Jones, Jack F Douglas, Jeffrey Pyun, Alamgir Karim
Abstract: Herein we report the ability to directly image the self-organization of polymer-coated ferromagnetic nanoparticles into one-dimensional mesostructures at a liquid-liquid interface. When polystyrene-coated Co nanoparticles (15 nm) are deposited at an ...

28. Nanoimprint Lithography and the Role of Viscoelasticity in the Generation of Residual Stress in Model Polystyrene Patterns
Published: 6/10/2008
Authors: Yifu Ding, Hyun W. Ro, Jing N. Zhou, Brian C. Okerberg, Jack F Douglas, Alamgir Karim, Christopher L Soles
Abstract: Understanding polymer deformation during the nanoimprinting process is key to achieve robust polymer nanostructures. Information regarding the process can be extracted from monitoring the decay of the imprinted polymer patterns during thermal anneal ...

29. Plasticization Effect of C^d60^ on the Fast Dynamics of Polystyrene and Related Polymers: An Incoherent Neutron Scattering Study
Published: 2/19/2008
Authors: Alejandro Sanz, Markus Ruppel, Jack F Douglas, J Cabral
Abstract: We utilize inelastic incoherent neutron scattering (INS) to quantify how fullerenes affect the fast molecular dynamics of a family of polystyrene related macromolecules.. Apparent Debye-Waller (DW) factors are determined as a function of temperatur ...

30. Model for Reversible Nanoparticle Assembly in a Polymer Matrix
Published: 1/8/2008
Authors: Andrew Rahedi, Jack F Douglas, Francis W. ~undefined~undefined~undefined~undefined~undefined Starr
Abstract: The clustering of nanoparticles (NP) within solutions and polymer melts depends sensitively on the strength and directionality of the NP interactions involved, as well as the molecular geometry and interactions of the dispersing fluids. Since cluster ...

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