Materials Literature
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A long standing problem in the manufacture of wheat-straw based composites with cost-effective formaldehyde-based resins is their poor water resistance as demonstrated by their large water thickness swell. In this study, wheat straw based medium density fiberboards were manufactured using 3 resin/wax systems: a melami…
We demonstrate that the conventional application of linear models to the analysis of optoelectromechanical properties of nanostructures in bandstructure engineering could be inadequate. The focus of the present paper is on a model based on the coupled Schrodinger-Poisson system where we account consistently for the pi…
We theoretically investigate the impact of the electrothermal flow on the dielectrophoretic separation of single-walled carbon nanotubes (SWNT). The electrothermal flow is observed to control the motions of semiconducting SWNTs in a sizeable domain near the electrodes under typical experimental conditions, therefore h…
We demonstrate that a near-field microwave microscope based on a transmission line resonator allows imaging in a substantially wide range of frequencies, so that the microscope properties approach those of a spatially-resolved impedance analyzer. In the case of an electric probe, the broadband imaging can be used in a…
This work identifies geometric effects on dynamics due to nonadiabatic couplings in Born Oppenheimer systems and provides a systematic method for deriving corrections to mixed quantum-classical methods. Specifically, an exact path integral formulation of the quantum nonadiabatic dynamics of Born Oppenheimer systems is…
The interaction of polarized light with a spin in the presence of dissipation is shown to be equivalent to a spin transfer process that can cause switching. In plasmas, the spin transfer is dominated by a spin-spin exchange term while at lower energy densities it is dominated by an optical Barnett-like effect. This la…
In local effective potential theories of electronic structure, the electron correlations due to the Pauli exclusion principle, Coulomb repulsion, and correlation-kinetic effects, are all incorporated in the local electron-interaction potential $v_{ee}({\bf r})$. In previous work, it has been shown that for spherically…
Layered double hydroxide (LDH)–supported nano noble metal heterogeneous catalysts are synthesized by ion exchange of K2PtCl6, Na2PdCl4 and impregnation of RhCl3 .3H2O followed by reduction with H2. The LDH–Rh, Pt, and Pd catalysts are tested in the enantioselective hydrogenation of ethyl pyruvate to ethyl lactate with…
Thr(93), Ser(94), Thr(140), and Ser(306) are conserved in all adenylosuccinate lyases (ASL) and are close to other amino acids previously identified by mutagenesis as being in the active site. To test their involvement in the enzyme's function, each of these amino acids was replaced by alanine. All the mutants exhibit…
Abstract Eu(OH)3 and Eu2O3 nanorods were prepared by a facile hydrothermal procedure. The obtained hexagonal phase Eu(OH)3 nanorods have diameter of about 50 nm and lengths ranging from 100 to 800 nm. Eu2O3 nanorods were obtained from Eu(OH)3 by calcination. The Eu2O3 nanorods show a pure cubic phase and exhibit chara…
Abstract ZnO particle was coated with thin nanoporous silica layers, and hollow nanoporous silica particles were obtained by removing ZnO (core).
Small-angle X-ray scattering was used to characterize the size and aggregation behavior of the Pt nanoparticles synthesized by the polyol process and the unusual poly(N-vinyl-2-pyrrolidone) (PVP) reduction. With formaldehyde (HCHO) as the reduction agent, the Pt nanoparticles synthesized in aqueous solutions with a hi…
Abstract A simple low-temperature solvothermal scheme has been developed to produce pure, well-controlled characteristics in terms of size, morphology, and monodispersity of barium titanate (BaTiO3) nanocubes. Characterizations of products were performed by XRD, TEM, HRTEM, EDS, and their sizes were 40–50 nm. The form…
We generalize the Fredrickson−Helfand theory of the microphase separation in symmetric diblock copolymer melts by taking into account the influence of a time-independent homogeneous electric field on the composition fluctuations within the self-consistent Hartree approximation. We predict that electric fields suppress…
This work examines the precipitation of PCC – pulp composite fillers with varying crystal habits and their effects on the papermaking properties of printing and writing paper. Colloidal (c-PCC), rhombohedral (r-PCC), and scalenohedral types (s-PCC) of composite PCCs were produced and compared with commercial reference…
info:eu-repo/semantics/published
Silver nanoparticles, capped with oleic acid, with mean diameters varying between 2.8 and 5.7 nm, have been synthesized by the polyol method and 1,6-hexane dithiol was subsequently substituted for the oleic acid. Whereas oleic acid-capped silver nanoparticles, like bulk silver, show a diamagnetic behavior, dithiol-cap…
The properties of an infinite carbon chain (polyyne), an allotropic form of elemental carbon, are of importance in materials science as well as astronomy. The Raman active longitudinal optical (LO) frequencies are calculated with first-principles methods for oligoynes and polyyne and compared with experiments. Since t…
Rubbery−glassy block copolymer dispersions are an attractive solution for toughening rigid thermoplastics like polystyrene without affecting optical transparency. An interesting facet of the copolymers used is molecular disorder, artificially introduced during anionic synthesis through composition gradients along the…
The kinetics of nucleation and growth of PbS nanocrystals or quantum dots in a boroaluminosilicate host glass have been studied in the dilute range of the precipitating phase (∼2 wt % PbS) using infrared absorption spectroscopy and transmission electron microscopy. The temperature dependence of the experimental steady…