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Author: jack douglas

Displaying records 41 to 50 of 224 records.
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41. Polymer Viscoelasticity and Residual Stress Effects on Nanoimprint Lithography
Published: 5/24/2007
Authors: Yifu Ding, Hyun W. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852665

42. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852673

43. 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. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852718

44. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830553

45. Crystallization of Polyethylene Oxide Patterend by Nanoimprint Lithography
Published: 3/28/2007
Authors: Brian C. Okerberg, Christopher L Soles, Jack F Douglas, Hyun W. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852701

46. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852177

47. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852679

48. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852674

49. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852707

50. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852641



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