Materials Literature
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Abstract Waterborne polyurethane (WBPU)/clay nanocomposites were synthesized using prepolymer process with different clay content (0–5 wt%) of organoclay cloisite 15A. The optimum dispersion temperature of clay in polyol was found to be 80 °C at 3 hours. The XRD confirmed the exfoliation dispersion of clay by polyol i…
Several Hypoxis species and infraspecific taxa in southern Africa were found to be conspecific with the taxa described earlier. In this paper, thirteen validly published names are reduced to synonyms. Nine currently recognized taxa out of about 30 species in the Flora of southern Africa region are listed together with…
Abstract Wavelength dispersion of birefringence in a miscible polymer blend of a polynorbornene and poly(styrene‐ co ‐maleic anhydride) was investigated. By adjusting the blend composition, the drawing ratio and the drawing temperature, the wavelength dispersion was controlled and the wide band quarter‐wave film was o…
We have used x-ray photoemission electron microscopy (XPEEM) and x-ray absorption spectroscopy (XAS) to characterize ${\mathrm{Mn}}_{x}{\mathrm{Ge}}_{1\ensuremath{-}x}$ and ${\mathrm{Cr}}_{y}{\mathrm{Mn}}_{x}{\mathrm{Ge}}_{1\ensuremath{-}x\ensuremath{-}y}$ films grown by molecular beam epitaxy. The surface layers of t…
This paper describes the experimental validation of two different transient models of the hybrid fuel cell/gas turbine facility of the U.S. DOE-NETL at Morgantown. The first part of this work is devoted to the description of the facility, designed to experimentally investigate these plants with real components, except…
Atom transfer radical polymerization (ATRP) was applied to a novel synthesis of prototype copolymer brushes. The procedure included the following steps: (1) free-radical copolymerization of vinylbenzyl-terminated polystyrene (PS-VB) macromonomer and N -(4-hydroxyphenyl)maleimide gave well-defined alternating comb-shap…
The electronic properties of double-wall carbon nanotubes (DWCNTs) are investigated via density functional theory. The DWCNTs are separated into four categories wherein the inner-outer nanotubes are metal-metal, metal-semiconductor, semiconductor-metal and semiconductor-semiconductor single-wall nanotubes. The band st…
Abstract Reactive extrusion for recycled PP/nylon blends from commingled plastic wastes was investigated through thermal, morphological, mechanical and rheological studies. From SEM investigation, we found improved surface morphologies with homogeneous domains in the recycled 75/25 PP/nylon blends compatibilized with…
Abstract DTPA‐bis(amide) derivatives bearing phenyl, phenol or catechol groups that mimic side chains of naturally occurring amino acids, such as phenylalanine, tyrosine or dopamine, were synthesized and characterized by elemental analysis, electrospray mass spectrometry, NMR spectroscopy and IR spectroscopy. The gado…
Abstract The nanocomposites of polyamide 6 (PA6) and polyhedral oligomeric silsesquioxane (POSS) containing primary and secondary amino groups were synthesized through in‐situ polymerization. The chemical structure of the PA6/POSS nanocomposites was characterized with FT‐IR and 1 H‐NMR spectroscopies. The solution vis…
Abstract Carbon nanofibers (CNFs) were covalently functionalized with biodegradable poly(ϵ‐caprolactone) (PCL) by in situ ring‐opening polymerization (ROP) of ϵ‐caprolactone in the presence of stannous octoate. Surface oxidation treatment of the pristine CNFs afforded carboxylic CNFs (CNF‐COOH). Reaction of CNF‐COOH w…
Upon irradiation with nanosecond pulsed UV laser, surface periodic microstructure and photoorientation occurred simultaneously on the azobenzene functionalized liquid crystalline dendrimer films. The orientation of azo groups was perpendicular to the polarization of pulsed laser and dependent on the laser fluence. The…
AGMA1, a prevailingly cationic amphoteric polyamidoamine obtained by polyaddition of (4-aminobutyl)guanidine (agmatine) to 2,2-bis(acrylamido)acetic acid, was studied as a potential DNA carrier and transfection promoter. Fluorescein-labeled AGMA1 was prepared by conjugation with fluorescein isothiocyanate and its cell…
Co 2 Fe Si films were prepared using magnetron sputtering technique on Cr buffer layers and MgO(001) substrates at various annealing temperatures. We investigated the crystal structures, magnetic properties (Ms and Hc), surface roughness, and magnetic damping constants (α) of the prepared Co2FeSi films. Out-of-plane a…
A novel strategy was developed in order to prepare various micro/nanostructured polyanilines (PANI) on polymer substrates. The strategy involved two main steps, i.e., a grafting polymerization of acrylate acid (AA) onto the surface of a polypropylene (PP) film and subsequently an oxidative polymerization of aniline on…
Abstract Currently new blends and composites are extending the utilisation of polymers from renewable resources into new value‐added products. This paper briefly discusses the development in this area, and introduces our research, in particular the starch‐based nanocomposites, biodegradable polyester/starch blends and…
Band-to-band tunneling (BTBT) devices have recently gained a lot of interest due to their potential for reducing power dissipation in integrated circuits. We have performed extensive simulations for the BTBT operation of carbon nanotube metal-oxide-semiconductor field-effect transistors (CNT-MOSFETs) using the nonequi…
Fluorescence blinking of single quantum dots (QDs) under constant illumination has attracted a great deal of attention from both experimentalists and theoreticians. To explain the power-law behavior in the distribution of both ``on'' and ``off'' times, several models have been proposed, in which the charge carrier is…
Using molecular dynamics (MD) simulation, we studied the structural transformation and breaking mechanism of a single crystalline copper nanowire under continuous strain. At a certain strain rate, an ensemble of relaxed initial states of the nanowire can preferentially go through one or more paths of deformation. In e…
Ultrathin films of a poly(styrene)-block-poly(2-vinylpyrindine) diblock copolymer (PS-b-P2VP) and poly(styrene)-block-poly(4-vinylpyrindine) diblock copolymer (PS-b-P4VP) were used to form surface-induced nanopattern (SINPAT) on mica. Surface interaction controlled microphase separation led to the formation of chemica…