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You searched on: Author: jack douglas

Displaying records 51 to 60 of 234 records.
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51. Relationship between dispersion metric and properties of PMMA/SWNT nanocomposites
Published: 6/13/2007
Authors: Takashi Kashiwagi, Jeffrey A Fagan, Jack F Douglas, Kazuya Yamamoto, Nathanael A Heckert, Stefan D Leigh, Jan Obrzut, Fangming Du, Minfang Mu, Sheng Lin-Gibson, K Winey, R Haggenmueller
Abstract: Particle spatial dispersion is a crucial characteristic of polymer composite materials and this property is recognized as especially important innanocomposite materials due to the general tendency of nanoparticles to aggregate under processing condit ...

52. Polymer Viscoelasticity and Residual Stress Effects on Nanoimprint Lithography
Published: 5/24/2007
Authors: Yifu Ding, Hyun Wook Ro, Jack F Douglas, Ronald Leland Jones, Daniel R. Hines, Alamgir Karim, Christopher L Soles
Abstract: We examine the influence of viscoelastic effects on the stability of nanoimprinted polymer films. The decay of features for polymers below the critical entanglement molecular mass at elevated temperatures is determined by simple surface tension and ...

53. Computer Simulations of Ionomer Self-Assembly and Dynamics
Published: 5/17/2007
Authors: Moonjoy Goswami, S K Kumar, Aniket Bhattacharya, Jack F Douglas
Abstract: Computer simulations of a model telechelic ionomer, i.e. a melt with a charge at each chain end along with neutralizing counterions, indicate a form of self-assembly that is hybrid between the packing driven interactions in block copolymers and the d ...

54. Self-Assembly of Patchy Particles Into Polymer Chains: A Parameter-Free Comparison Between Wertheim Theory and Monte Carlo Simulation
Published: 5/17/2007
Authors: F Sciortino, Emanuela Bianchi, Jack F Douglas, Piero Tartaglia
Abstract: We numerically study a simple fluid composed of particles having a hard-core repulsion, complemented by two short-ranged attractive (sticky) spots at the particle poles, which provides a simple model for equilibrium polymerization of linear chains. ...

55. Using Pattern Homogenization of Binary Masks to Fabricate Microfluidic Structures With 3D Topography
Published: 5/2/2007
Authors: Francisco Javier Atencia, Susan E. Barnes, Jack F Douglas, John Meacham, Laurie E Locascio
Abstract: Because fluids at the microscale form three dimensional interfaces and are subject to three dimensional forces, the ability to create microstructures with modulated topography over large areas could greatly improve control over microfluidic phenomena ...

56. Crystallization of Polyethylene Oxide Patterend by Nanoimprint Lithography
Published: 3/28/2007
Authors: Brian C. Okerberg, Christopher L Soles, Jack F Douglas, Hyun Wook Ro, Alamgir Karim
Abstract: The crystallization behavior of poly(ethylene oxide) (PEO) films patterned by nanoimprint lithography is studied. The imprinted PEO film consists of parallel lines, approximately 240 nm wide and 320 nm tall, on a 400 nm pitch with a residual laye ...

57. Numerical Path-Integration Technique for the Calculation of Transport Properties
Published: 3/13/2007
Authors: E Kang, M Mansfield, Jack F Douglas
Abstract: We present a new technique for the computation of both the translational diffusivity and the intrinsic viscosity of macromolecules, and apply it here to approximately 1000 different protein structures. The computed translational diffusivities and i ...

58. The Effect of Nanoparticle Shape on Polymer-Nanocomposite Rheology and Tensile Strength
Published: 2/23/2007
Authors: Scott Knauert, Jack F Douglas, Francis W. ~undefined~undefined~undefined~undefined~undefined Starr
Abstract: Nanoparticles can influence the properties of polymer materials by a variety of mechanisms. The molecular dynamics simulations in the present work focus on the case where the modification of the melt structure by glass-formation and entanglement inte ...

59. Crystallization-Induced Fluid Flow in Polymer Melts Undergoing Solidification
Published: 2/19/2007
Authors: Donghua Xu, Z G Wang, Jack F Douglas
Abstract: The formation of semi-crystalline plastic polymer materials often occurs under confinement conditions where high pressure imprinting or casting in a mold are involved. To gain insight into this highly non-equilibrium process, we examine the nature ...

60. Field-Induced Formation of Linear, Mesoscopic Polymer Chains From Ferromagnetic Nanoparticles
Published: 2/2/2007
Authors: Jason Benkoski, Steven Bowles, Bryan Korth, Ronald Leland Jones, Jack F Douglas, Alamgir Karim, Jeffrey Pyun
Abstract: Polymer-coated ferromagnetic colloids are first assembled with an applied magnetic field and then permanently fixed into one-dimensional mesostructures using a novel liquid-liquid interfacial system known as Fossilized Liquid Assembly. Using polysty ...

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