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You searched on: Author: jack douglas

Displaying records 41 to 50 of 234 records.
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41. 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 ...

42. 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 ...

43. 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 ...

44. 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 ...

45. 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 ...

46. 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 ...

47. 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 ...

48. Relaxation Behavior of Polymer Structures Fabricated by Nanoimprint Lithography
Published: 8/14/2007
Authors: Yifu Ding, Hyun Wook Ro, Thomas Avery Germer, Jack F Douglas, Brian C. Okerberg, Alamgir Karim, Christopher L Soles
Abstract: We study the decay of the imprinted polystyrene (PS) patterns under thermal annealing using light diffraction. The first order diffraction intensity from the imprinted gratings was measured as a function of annealing time. Local intensity maximum i ...

49. Characterization of the Potential Energy Landscape in an Antiplasticized Polymer
Published: 7/6/2007
Authors: Robert A Riggleman, Jack F Douglas, J J de Pablo
Abstract: Transition state searches have been performed on model coarse-grained polymer systems, and the results compared to those of an antiplasticized polymer system, which have been previously shown to be fragile and strong glass-forming systems, respective ...

50. Tuning Polymer Melt Fragility With Antiplasticizer Additives
Published: 6/19/2007
Authors: Robert A Riggleman, Jack F Douglas, J J de Pablo
Abstract: A polymer-diluent model exhibiting antiplasticization has beendeveloped and characterized by molecular dynamics simulations. Antiplasticizer molecules are shown to decrease the glass transition temperature Tg, but to increase the elastic moduli o ...

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