Browsing Physics and Astronomy by Type "Article"
Now showing items 61-80 of 82
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Reconstructing quantum molecular rotor ground states
(Physical Review B, 2020-07-06)Nanomolecular assemblies of C60 can be synthesized to enclose dipolar molecules. The low-temperature states of such endofullerenes are described by quantum mechanical rotors, which are candidates for quantum information ... -
Reduction of polymer surface tension by crystallized polymer nanoparticles
(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 ... -
Relationship between vessel diameter and depth measurements within the limbus using ultra-high resolution optical coherence tomography
(Elsevier, 2018-01-01)Purpose To establish a relationship between the diameter and depth position of vessels in the superior and inferior corneo-scleral limbus using ultra-high resolution optical coherence tomography (UHR-OCT). Methods Volumetric ... -
A ring-polymer model shows how macromolecular crowding controls chromosome-arm organization in Escherichia coli
(Nature Publishing Group, 2017-09-19)Macromolecular crowding influences various cellular processes such as macromolecular association and transcription, and is a key determinant of chromosome organization in bacteria. The entropy of crowders favors compaction ... -
Risk associated with H2S evolution in sour aquifers during CO2 injection
(Elsevier, 2011)Many aquifers suitable for CO2 sequestration contain measurable concentration of dissolved non-hydrocarbon species. In this paper, the compositional modelling of the CO2 injection into aquifers that contain dissolved ... -
Segregation of chain ends to the surface of a polymer melt: effect of surface profile versus chain discreteness
(Springer, 2016)Silberberg has argued that the surface of a polymer melt behaves like a reflecting boundary on the random-walk statistics of the polymers. Although this is approximately true, independent studies have shown that violations ... -
Self-assembly of a binary mixture of particles and diblock copolymers
(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
(American Chemical Society, 2004)None. -
Self-Assembly of Amphiphilic Nanoparticle-Coil “Tadpole” Macromolecules
(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 ... -
The Self-Assembly of Particles with Isotropic Interactions
(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
(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. ... -
A sensitive search for dark energy through chameleon scalar fields using neutron interferometry
(IOP Publishing, 2015-01-22)The physical origin of the dark energy, which is postulated to cause the accelerated expansion rate of the universe, is one of the major open questions of cosmology. A large subset of theories postulate the existence of a ... -
Small-polaron variable-range hopping in quasi-two-dimensional materials: application to PrBa2Cu3-xGax07-y
(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 ... -
Spin-orbit states of neutron wave packets
(American Physical Society, 2016-07-13)We propose amethod to prepare an entangled spin-orbit state between the spin and the orbital angular momenta of a neutron wave packet. This spin-orbit state is created by passing neutrons through the center of a quadrupole ... -
Spontaneous Tilting Transition in Liquid-Crystalline Polymer Brushes
(2019)The equilibrium phase behavior of main-chain liquid-crystalline polymer brushes in good solvent is investigated using self-consistent field theory. The calculation assumes semi-dilute brushes, where the grafting density ... -
Surface Tension of High Density Polyethylene (HDPE) in Supercritical Nitrogen: Effect of Polymer Crystallization
(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 ... -
Testing the Universality of Entropic Segregation at Polymer Surfaces
(2018)This study addresses entropic segregation effects at the surfaces of monodisperse and bidisperse melts. For the monodisperse melts, we focus on the segregation of chain ends to the surface, and for the bidisperse melts, ... -
Three Phase-Grating Moire Neutron Interferometer for Large Interferometer Area Applications
(American Physical Society, 2018-03-12)We demonstrate a three phase-grating moire neutron interferometer in a highly intense neutron beam as a robust candidate for large area interferometry applications and for the characterization of materials. This novel ... -
Tilt grain boundaries in a diblock copolymer ordered nanocomposite lamellar phase
(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. ... -
Towards Maximal Cell Density Predictions for Polymeric Foams
(Elsevier, 2011-10-04)Self-consistent field theory is used to make direct predictions for the maximum possible cell densities for model polymer foam systems without recourse to classical nucleation theory or activation barrier kinetic arguments. ...