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You searched on: Author: jack douglas

Displaying records 41 to 50 of 227 records.
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41. 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 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 ...

42. 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 ...

43. 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 ...

44. 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 ...

45. 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 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 ...

46. 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 ...

47. 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. ...

48. 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 ...

49. Crystallization of Polyethylene Oxide Patterend by Nanoimprint Lithography
Published: 3/28/2007
Authors: Brian C. Okerberg, Christopher 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 ...

50. 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 ...

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