Browsing Physics and Astronomy by Author "Thompson, Russell B."
Now showing items 21-40 of 41
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Nanoparticle-regulated phase behavior of ordered block copolymers
Thompson, R.B.; Gaines, Michelle K.; Smith, Steven D.; Samseth, Jon; Bockstaller, Michael R.; Rasmussen, Kim; Spontak, Richard J. (RSC publishing, 2008-06-30)Although block copolymer motifs have received considerable attention as supramolecular templates for inorganic nanoparticles, experimental observations of a nanostructured diblock copolymer containing inorganic ... -
Ordering and Reverse Ordering Mechanisms of Triblock Copolymers in the Presence of Solvent
Thompson, Russell B.; Rasmussen, Kim; Maniadis, Panagiotis; Kober, Edward M. (MDPI, 2009-02-27)Self-consistent field theory is used to study the self-assembly of a triblock copolymer melt. Two different external factors (temperature and solvent) are shown to affect the self-assembly. Either one or two-step self-assembly ... -
Ordering mechanisms in triblock copolymers
Maniadis, P.; Thompson, Russell B.; Rasmussen, Kim O.; Lookman, Turab (American Physical Society, 2004)The ordering mechanisms for an ABC triblock copolymer system are studied using self-consistent field theory. We find a two-phase mechanism, similar to what has been suggested experimentally two-step mecha- nism. Analysis ... -
Origin of change in molecular-weight dependence for polymer surface tension
Thompson, R. B.; MacDonald, J. R.; Chen, P. (APS publishing, 2008-09-30)Self-consistent-field theory is used to reproduce the behavior of polymer surface tension with molecular-weight for both lower and higher molecular-weight polymers. The change in behavior of the surface tension between ... -
Origins of Elastic Properties in Ordered Block Copolymer/Nanoparticle Composites
Thompson, Russell B.; Rasmussen, Kim O.; Lookman, Turab (American Chemical Society, 2004)We predict a diblock copolymer melt in the lamellar phase with added spherical nanoparticles that have an affinity for one block to have a lower tensile modulus than a pure diblock copolymer system. This weakening is due ... -
Origins of the failure of classical nucleation theory for nanocellular polymer foams
Thompson, Russell B.; Kim, Yeongyoon; Park, Chul B.; Chen, P. (RSC publishing, 2011-07-06)Relative nucleation rates for fluid bubbles of nanometre dimensions in polymer matrices are calculated using both classical nucleation theory and self-consistent field theory. An identical model is used for both calculations ... -
Particle Distributions in a Block Copolymer Nanocomposite
Matsen, Mark W.; Thompson, Russell B. (American Chemical Society, 2008)Self-consistent-field theory is used to predict the center-of-mass distribution of spherical nanoparticles embedded in the lamellar phase of a diblock copolymer melt. The calculation is performed in the dilute limit, where ... -
Polymeric Foaming Predictions from the Sanchez-Lacombe Equation of State: Application to Polypropylene-Carbon Dioxide Mixtures
Thompson, Russell B (American Physical Society, 2017)A simple off-lattice method of deriving the Sanchez-Lacombe equation of state is presented. The Sanchez-Lacombe equation of state for mixtures is shown to be thermodynamically inconsistent for all mixing rules in such a ... -
Predicting nonpolymeric materials structure with real-space self-consistent field theory
Thompson, R.B. (APS publishing, 2006-02-17)Polymer self-consistent field theory of the Edwards-Helfand kind is the state-of-the-art method for predicting the morphologies of block copolymer materials. The methodology of block copolymer self-consistent field theory ... -
Predicting the Mesophases of Copolymer-Nanoparticle Composites
Thompson, Russell B.; Ginzburg, Valeriy V.; Matsen, Mark W.; Balazs, Anna C. (American Association for the Advancement of Science, 2001)The interactions between mesophase-forming copolymers and nanoscopic par- ticles can lead to highly organized hybrid materials. The morphology of such composites depends not only on the characteristics of the copolymers, ... -
Predicting the phases of a two-dimensional hard-rod system with real-space self-consistent field theory
Thompson, Russell B. (APS publishing, 2006-10-16)Polymer self-consistent field theory numerical tools are applied to a two-dimensional hard-rod colloidal system. Rods are represented through an interaction site model density functional theory that is derived and expressed ... -
Reduction of polymer surface tension by crystallized polymer nanoparticles
Thompson, Russell; Park, Chul B.; Chen, P. (AIP Publishing, 2010-10-14)Self-consistent field theory is applied to investigate the effects of crystallized polymer nanoparticles on polymer surface tension. It is predicted that the nanoparticles locate preferentially at the polymer surface and ... -
Self-assembly of a binary mixture of particles and diblock copolymers
Lee, Jae Youn; Thompson, Russell B.; Jasnow, David; Balazs, Anna C. (Royal Society of Chemistry, 2003)Using theoretical models, we undertake the first investigation into the synergy and rich phase behavior that emerges when binary particle mixtures are blended with microphase- separating copolymers. We isolate an example ... -
Self-Assembly of Amphiphilic Nanoparticle-Coil “Tadpole” Macromolecules
Lee, Jae Youn; Balazs, Anna C.; Thompson, Russell B.; Hill, Randall M. (American Chemical Society, 2004)There has been considerable fascination with the self-assembling behavior of amphiphilic chainlike molecules that range from short-chain surfactants to high molecular weight block copolymers. The self-assembly of simple ... -
Self-Assembly of Amphiphilic Nanoparticle-Coil “Tadpole” Macromolecules
Lee, Jae Youn; Balazs, Anna C.; Thompson, Russell B.; Hill, Randall M. (American Chemical Society, 2004)None. -
The Self-Assembly of Particles with Isotropic Interactions
Konigslow, K. von; Cardenas-Mendez, E. D.; Thompson, Russell (IOP publishing, 2013-07-03)A generic field-theoretic model for the self-assembly of particles with isotropic interactions, motivated by ideas in DNA-mediated colloidal assembly, is presented. A simplest possible system of colloids in explicit ... -
The self-assembly of particles with isotropic interactions: Using DNA coated colloids to create designer nanomaterials
Thompson, R. B.; Dion, Shawn; von Konigslow, K. (AIP publishing, 2014-04-03)Self-consistent field theory equations are presented that are suitable for use as a coarse-grained model for DNA coated colloids, polymer-grafted nanoparticles and other systems with approximately isotropic interactions. ... -
Small-polaron variable-range hopping in quasi-two-dimensional materials: application to PrBa2Cu3-xGax07-y
Thompson, Russell B.; Singh, M. (Taylor & Francis, 1999-01)We have developed a theory for variable-rangehopping (VRH) due to small polarons in quasi-two-dimensionalsystems at high temperatures.We included the effects of temperature, electric fields, magnetic fields and scattering ... -
Surface Tension of High Density Polyethylene (HDPE) in Supercritical Nitrogen: Effect of Polymer Crystallization
Thompson, R. B.; Park, Chul B.; Chen, P.; Wei, H. (Elsevier, 2009-06-10)Surface tension of a polymer melt in a supercritical fluid is a principal factor in determining cell nucleation and growth in microcellular foaming. This work focuses on the surface tension of a crystalline polymer, high ... -
Tilt grain boundaries in a diblock copolymer ordered nanocomposite lamellar phase
Thompson, Russell B. (AIP publishing, 2010-10-08)A hybrid self-consistent field theory/density functional theory method is applied to predict tilt(kink) grain boundary structures between lamellar domains of a symmetric diblock copolymer with added spherical nanoparticles. ...