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You searched on: Author: jack douglas

Displaying records 31 to 40 of 227 records.
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31. 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 ...

32. 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 ...

33. 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 ...

34. 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 Wook 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 ...

35. 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 ...

36. 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 ...

37. Block Copolymer Ordering With a Spatiotemporally Inhomogeneous Mobility
Published: 11/20/2007
Authors: August W. Bosse, Jack F Douglas, Brian Berry, Ronald Leland Jones, Alamgir Karim
Abstract: Motivated by recent measurements of zone annealing in block copolymer films at low temperatures, we implement a spatiotemporal mobility gradient with intrinsic variations associated with dynamic heterogeneities in the saddle point relaxation of a dib ...

38. Shear-Induced Conductor-Insulator Transition in Melt Mixed Polypropylene-Carbon Nanotube Dispersions
Published: 11/15/2007
Authors: Jan Obrzut, Jack F Douglas, S B. Kharchenko, Kalman D Migler
Abstract: The blending of carbon nanotubes (CNT) into polymer matrices leads to intrinsically non-equilibrium materials whose properties can depend strongly on flow history. We have constructed a rheo-dielectric spectrometer that allows for the simultaneous in ...

39. The Effect of Temperature on the Morphology and Kinetics of Surface Pattern Formation in Thin Block Copolymer Films
Published: 10/29/2007
Authors: A P Smith, Jack F Douglas, Eric J. Amis, Alamgir Karim
Abstract: Hole formation and size evolution on the surface of thin films of symmetric diblock copolymers is simultaneously investigated as a function of time, t, temperature, T, and film thickness, h. The hole size h approaches a steady state value at long ti ...

40. Atomic Motion During the Migration of General [001] Tilt Grain Boundaries in Ni
Published: 8/24/2007
Authors: Hao Zhang, David J Srolovitz, Jack F Douglas, James A Warren
Abstract: We generalize a previous study of the atomic motions governing grain boundary migration to consider arbitrary misorientations of [001] tilt boundaries. Our examination of the nature of atomic motions employed three statistical measures: the non-Gau ...

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