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You searched on: Author: jack douglas

Displaying records 61 to 70 of 234 records.
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61. Pattern-directed to isotropic dewetting transition in polymer films on micropatterned surfaces with differential surface energy contrast
Published: 1/27/2007
Authors: D Julthongpiput, Wenhua Zhang, Jack F Douglas, Alamgir Karim, Michael J Fasolka
Abstract: Surface chemical patterns can both cause and direct dewetting in overlying thin films. However, a key factor in this behavior, the magnitude of surface energy differences between pattern domains ( ?g ), is largely unevaluated. To probe the effect o ...

62. Pattern-Directed to Isotropic Dewetting Transition in Polymer Films on Micropatterned Surfaces With Differential Surface Energy Contrast
Published: 1/1/2007
Authors: D Julthongpiput, Wenhua Zhang, Jack F Douglas, Alamgir Karim, Michael J Fasolka

63. Photocurable Oil/Water Interfaces as a Universal Platform for 2-D Self-Assembly
Published: 12/14/2006
Authors: Jason Benkoski, Ronald Leland Jones, Jack F Douglas, Alamgir Karim
Abstract: We present a novel platform for the creation of 2-D assemblies from nanoscale building blocks. The system consists of an oil/water interface in which the oil phase can be flash-cured upon UV exposure. The photopolymerizable material, 1,12-dodecaned ...

64. Does Equilibrium Polymerization Describe the Dynamic Heterogeneity of Glass-Forming Liquids?
Published: 10/13/2006
Authors: Jack F Douglas, J Dudowicz, Karl Freed
Abstract: We examine whether the `dynamic heterogeneities' of glass-forming liquids can be described by equilibrium polymerization. This correspondence is first checked by demonstrating a resemblance between the T dependence of the configurational entropy s in ...

65. Characterization of Atomic Motions Governing Grain Boundary Migration
Published: 9/24/2006
Authors: Hao Zhang, David J Srolovitz, Jack F Douglas, James A Warren
Abstract: Molecular dynamics simulations were employed to study atomic motion within stationary and migrating asymmetric tilt grain boundaries. We employ several measures of the complexity of the atomic trajectories, including the van Hove correlation funct ...

66. A Hybrid Finite Element-Analytical Method For Determining the Intrinsic Elastic Moduli of Particles Having Moderately Extended Shapes and a Wide Rande of Elastic Properties
Published: 8/1/2006
Authors: Edward Joseph Garboczi, Jack F Douglas, Howard Hung
Abstract: The presence of a low (dilute) concentration of paniculate inclusions having any shape and any property mismatch with the matrix in which they are placed, influences the elasticity of the resulting composite material. This influence is via the intrin ...

67. Polycrystalline Patterns in Far-From-Equilibrium Freezing: A Phase Field Study
Published: 8/1/2006
Authors: L Granasy, T Pusztai, T Borzsonyi, G Toth, G - Tegze, James A Warren, Jack F Douglas
Abstract: We discuss the formation of polycrystalline microstructures with the framework of phase field theory. First, the model is tested for crystal nucleation in a hard sphere system. It is shown that, when evaluating the model parameters from molecular d ...

68. Influence of Confinement on the Fragility of Antiplasticized and Pure Polymer Films
Published: 7/27/2006
Authors: Robert A Riggleman, K Yoshimoto, Jack F Douglas, J J de Pablo
Abstract: We investigate by molecular dynamics simulation how thin film confinementmodifies the fragility of a model glass-forming liquid characterized previously in the bulk. Film confinement is found to reduce the relative fragility of the polymer fluid, le ...

69. Nature of the Breakdown in the Stokes-Einstein Relationship in a Hard Sphere Fluid
Published: 6/1/2006
Authors: S K Kumar, Grzegorz Szamel, Jack F Douglas
Abstract: Molecular Dynamics simulations of high density hard sphere fluids clearly show a breakdown of the Stokes-Einstein equation (SE). This result has been conjectured to be due to the presence of mobile particles, i.e., ones which have the propensity to ...

70. Lattice Model of Equilibrium Polymerization: V. Scattering Properties and the Width of the Critical Regime for Phase Separation
Published: 4/1/2006
Authors: Kyunil Rah, Karl Freed, J Dudowicz, Jack F Douglas
Abstract: Dynamic clustering associated with self-assembly in many complex fluids can qualitatively alter the shape of their phase boundaries and produce large changes in the scale of critical fluctuations that are difficult to comprehend within the existing c ...

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