Materials Literature
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The structure and properties of vacancies in a 2 nm Si nano-crystal are studied using a real space density functional theory/pseudopotential method. It is observed that a vacancy's electronic properties and energy of formation are directly related to the local symmetry of the vacancy site. The formation energy for vac…
We report the presence of a correlation between the bulk and interfacial properties of electrostatic coacervate complexes. Complexes were obtained by co-assembly between cationic-neutral diblocks and oppositely charged surfactant micelles or 7 nm cerium oxide nanoparticles. Light scattering and reflectometry measureme…
We have performed a temperature-dependent photoemission study of a NaxCoO2 (x~0.8) epitaxial thin film prepared by the reactive solid-phase epitaxy method. The chemical potential shift as a function of temperature was derived from the Co 3d peak shift, and revealed a crossover from the degenerate Fermion state at low…
We present detailed investigations of the fabrication and characterization of photovoltaic devices consisting of poly(3-hexylthiophene) (P3HT) intercalated into a mesoporous structure of ZnO nanofibers. ZnO nanofibers were grown via a low-temperature hydrothermal route from a solution of zinc nitrate precursor. P3HT w…
AIMS: To investigate the toxic effect of chitosan on important root pathogenic and biocontrol fungi (nematophagous, entomopathogenic and mycoparasitic). METHODS AND RESULTS: We have used standard bioassays to investigate the effect of chitosan on colony growth and developed bioassays to test spore germination. The res…
Superior fluorescence imaging methods are needed for detailed studies on biological phenomena, and one approach that permits precise analyses is time-resolved fluorescence measurement, which offers a high signal-to-noise ratio. Herein, we describe a new fluorescence imaging system to visualize biomolecules within livi…
A naturally occurred microtubullar silicate, halloysite nanotubes (HNTs), was co-cured with epoxy/cyanate ester resin to form organic–inorganic hybrids. The coefficient of thermal expansion (CTE) of the hybrids with low HNT concentration was found to be substantially lower than that of the plain cured resin. The modul…
We have successfully sculptured a variety of copper films with open interconnected macroporous walls and nanoparticles using hydrogen bubbles as the dynamic template. In this process, the hydrogen bubbles arising from the electrochemical reduction of H + in the deposition process functioned as the dynamic template for…
Abstract The use of thermoplastic/liquid‐crystalline polymer (LCP) blends is recognized as a good strategy for reducing viscosity and improving mechanical properties relative to pure thermoplastics. This improvement, however, is only noticeable if the LCP fibrillates, in situ , during processing and the fibrils are ke…
Abstract The nonisothermal crystallization, melting behavior, and morphology of isotactic polypropylene (PP)/linear bimodal polyethylene (LBPE) blends were studied with differential scanning calorimetry, scanning electron microscopy, and polarized optical microscopy. The results showed that PP and LBPE were miscible t…
We have utilized neutron powder diffraction to probe the crystal structure of layered ${\mathrm{Na}}_{x}\mathrm{Co}{\mathrm{O}}_{2}$ near the half doping composition of $x=0.46$ over the temperature range of $2--600\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. Our measurements show evidence of a dynamic transition in the mo…
Amorphous silicon–nitrogen (a-SiN) thin films have been independently doped with Sm, Tb, and Sm+Tb. The films were prepared by reactive cosputtering and characterized by energy dispersive x-ray analysis, optical transmission, and photo- and cathodoluminescence techniques. All films display room-temperature visible lum…
Sodium aluminosilicate has been precipitated in-situ as filler on hardwood bleached kraft pulp fibers using papermaker’s alum and sodium silicate. The filler was produced in two ways, first in the absence of the fibers and second in the presence of fibers, i.e. in-situ precipitation of filler. The filler produced in a…
Abstract A novel strategy to prepare reactively compatibilized polymer blends is reported. An oligomer that consists of AMS ( α ‐methyl styrene) and GMA (glycidyl methacrylate) is initially synthesized. When this oligomer is melt blended with poly(propylene) (PP), the GMA units in the oligomer are successfully grafted…
We use the x-ray absorption fine structure spectroscopy at Nb $K$ edge to reveal the local atomic structure of ${\mathrm{K}}_{x}{\mathrm{Na}}_{1\ensuremath{-}x}\mathrm{Nb}{\mathrm{O}}_{3}$ (PSN) solid solutions. The study is performed over the temperature range $10--1023\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ for six d…
The D-glucose/D-galactose-binding protein (GGBP) of Escherichia coli serves as an initial component for both chemotaxis toward D-galactose and D-glucose and high-affinity active transport of the two sugars. GGBP is a monomer with a molecular weight of about 32 kDa that binds glucose with micromolar affinity. The sugar…
Gas sensing experiments on hydrogenated amorphous silicon (a-Si:H) films have been performed. We show that a-Si:H exhibits a low-temperature gas response that is distinctly different from the more familiar combustive gas response operative on heated metal-oxide surfaces. In particular, we show that at room temperature…
Abstract BACKGROUND: Hollow microspheres, especially biodegradable polymeric microspheres, have attracted considerable attention due to their particular characteristics. Up to now, microspheres have been prepared via various strategies, for instance the template synthesis method and the self‐assembly process. However,…
An unexpected highly exothermic reaction followed by explosion has been studied by means of reaction calorimetry and adiabatic calorimetry. The investigation of the process shows that the incident took place by a local adiabatic temperature rise in the reactor vessel due to the presence of potassium carbonate, which a…
We demonstrate the operation of a radio-frequency single-electron transistor (RF-SET) using single-wall carbon nanotubes (SWNTs). The device is embedded in a resonant tank circuit and operates in reflection mode at temperatures as high as 5 K. Both frequency domain and time domain results are presented. With a gate mo…