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Author: jack douglas
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21. Self-Assembly in a Polymer Matrix and its Impact on Phase
Jack F Douglas, Jacek Dudowicz, Karl Freed
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 ...
22. Molecular Simulation of the Swelling of Polyelectrolyte Gels by Monovalent and Divalent Counterions
De-Wei Yin, Jack F Douglas, J J de Pablo
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. ...
23. Influence of Nanotube Length on the Optical and Conductivity Properties of Thin Single-Wall Carbon Nanotube Networks
Daneesh Olivia Simien, Jeffrey A Fagan, Wei R. Luo, Jack F Douglas, Kalman D Migler, Jan Obrzut
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 ...
24. Influence of Carbon Nanotube Aspect Ratio on Normal Stress Differences in Isotactic Polypropylene Nanocomposite Melts
Donghua Xu, Z G Wang, Jack F Douglas
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 ...
25. Quantifying Changes in the Fast Dynamics of Mixtures by Dielectric Spectroscopy
Tatiana Psurek, Christopher L Soles, Kirt Anthony Page, Marcus T Cicerone, Jack F Douglas
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 ...
26. Influence of Single-Wall Carbon Nanotube Length on the Optical and Conductivity Properties of Thin Buckypaper Films
Daneesh Olivia Simien, Jeffrey A Fagan, Jack F Douglas, Kalman D Migler, Jan Obrzut
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 ...
27. Multi-Step Relaxation in Equilibrium Self-Assembling Solutions: A General Model of Relaxation in 'Complex' Fluids
Evgeny B Stukalin, Jack F Douglas, Karl Freed
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 ...
28. Orientational Order in Block Copoloymer Films Zone Annealed Below the Order-Disorder Transition Temperature
Brian Berry, August W. Bosse, Jack F Douglas, Ronald Leland Jones, Alamgir Karim
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 ...
29. Facile Imaging of Giant Meso-Polymers Formed From Polymer Coated Magnetic Nanoparticles Using Fossilized Liquid Assembly
Jason Benkoski, Steven Bowles, Ronald Leland Jones, Jack F Douglas, Jeffrey Pyun, Alamgir Karim
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 ...
30. Nanoimprint Lithography and the Role of Viscoelasticity in the Generation of Residual Stress in Model Polystyrene Patterns
Yifu Ding, Hyun W. Ro, Jing N. Zhou, Brian C. Okerberg, Jack F Douglas, Alamgir Karim, Christopher L Soles
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 ...