Materials Literature
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Intertidal sediments are important areas that separate the land from the sea and form natural coastal defenses. They are known as highly productive ecosystems, fueling the coastal food web. It is also conceived that microphytobenthos contribute to the stability of intertidal sediments by increasing the erosion thresho…
An Al-7.6 at.% Mg alloy was ball milled in liquid N2 for 8 h and its microstructures were investigated using transmission electron microscopy. Electron diffraction confirmed that the resulting powder is a supersaturated Al-Mg solid solution with an fcc structure. Three typical nanostructures with different grain-size…
President Bush, during his State of the Union Address this year, pronounced a $1.2 billion jump-start to the hydrogen economy. The move would represent not only freedom from US-dependence on foreign oil, which is a national security issue, but also a necessary and gargantuan step toward improving the environment by re…
A special room‐temperature ionic liquid , 1‐hexadecyl‐3‐methyl‐imidazolium chloride, is used as a template to prepare monolithic super‐microporous silica with lamellar order (monolith in Figure) via a nanocasting technique. The silica walls of the synthesized product are arranged parallel to each other, displaying a r…
Abstract The focus of this research was to investigate the effect of thermal degradation upon the mechanical properties of a natural rubber compound. We examined both the quasi-static and dynamic mechanical properties of a natural rubber vulcanizate which had been subjected to isothermal, anaerobic aging. The thermal…
We performed a series of dynamic hysteresis measurements on Finemet films with composition Fe/sub 73.5/Cu/sub 1/Nb/sub 3/Si/sub 13.5/B/sub 9/, using both the longitudinal magneto-optical Kerr effect (MOKE) and the inductive fluxometric method. The MOKE dynamic hysteresis loops show a more marked variability with the f…
We found that the grain size of V2O5 thin films produced by pulsed laser ablation strongly influences their optical characteristics. The decrease in the optical band gap associated with a change in spectral transmittance of the pulsed laser deposited V2O5 films are mainly due to structure evolution from amorphous to c…
ABSTRACT: Internal and sensory quality of eggs coated with chitosan was evaluated during a 5‐wk storage at 25 °C. Three chitosans with high (HMw, 1100 KDa), medium (MMw, 746 KDa), and low (LMw, 470 KDa) molecular weight were used to prepare coating solutions. Coating with LMw chitosan was more effective in preventing…
Oxide electronics , which together with amorphous semiconductors could become a rapid‐growth field, have come a step closer with the first report of a p‐type amorphous oxide semiconductor, ZnO·Rh 2 O 3 . The thin‐film deposition of this material at room temperature and the fabrication of p–n heterojunction diodes on f…
Nickel bulk, the low index surfaces and the adsorbate systems Ni(111) (root 3 x root3)-Cl, and Ni(111)(2 x 2)-K are studied with gradient corrected density functional calculations. It is demonstrated that an approach based on Gaussian type orbitals is capable of describing these systems. The preferred adsorption sites…
Abstract Thin films of block copolymers have been used as templates and scaffolds for the fabrication of arrays of nanostructured materials. In general, a chemical modification of the film or the removal of one of the components by photodegradative methods is required to produce a nanoporous film that serves as a temp…
The literature on protective tribological coatings often focuses on correlations with measurable coating properties (composition, structure, and mechanical) but ignores the mechanisms of friction and wear. In fact, long-lived coatings often survive because of third bodies that form inside the moving contact. This arti…
We have used dissipative particle dynamics (DPD) to simulate surfactant monolayers on the interface between oil and water. With a simple surfactant model, we investigate how variations in size and structure of surfactants influence their ability to reduce the interfacial tension. In particular, we studied the effect o…
The resonance wavelength of the surface plasmon in gold nanoparticles above a gold substrate has been measured using transmission absorption spectroscopy. Gold nanoparticles with diameters in the range of 20−100 nm are immobilized onto a thin gold film deposited onto a glass substrate by a self-assembled monolayer of…
Metal deposition of Zr an a Si(001) surface has been studied by state-of-the-art electronic structure calculations. The energy per Zr adatom as a function of the coverage shows, that Zr forms silicide islands even at low coverages. Adsorbed Zr is thermodynamically unstable against the formation of bulk silicide ZrSi2.…
By using pseudopotential method with local spin density functional approximation, the electronic band structures of Na$_{x}$CoO$_{2}$ are calculated for $x=0.25$, 0.5, 0.75, and $x=1$ in the presence of the structure relaxations. As increasing Na content, the hybridization between cobalt and oxygen orbitals is decreas…
PURPOSE: To label human hematopoietic progenitor cells with various magnetic resonance (MR) imaging contrast agents and to obtain 1.5-T MR images of them. MATERIALS AND METHODS: Hematopoietic progenitor cells, labeled with ferumoxides, ferumoxtran, magnetic polysaccharide nanoparticles-transferrin, P7228 liposomes, an…
MOTIVATION: Structural templates consisting of a few atoms in a specific geometric conformation provide a powerful tool for studying the relationship between protein structure and function. Current methods for template searching constrain template syntax and semantics by their design. Hence there is a need for a more…
B 4 C powder compacts were sintered using a graphite dilatometer in flowing He under constant heating rates. Densification started at 1800°C. The rate of densification increased rapidly in the range 1870°–2010°C, which was attributed to direct B 4 C–B 4 C contact between particles permitted via volatilization of B 2 O…
A series of rare earth compound nanotubes , including hydroxides, oxides, oxysulfides, and hydroxyfluorides, have been synthesized using a facile hydrothermal method. Owing to their excellent hydrophilicity, the nanotubes can be easily functionalized, and should offer new opportunities in areas such as optoelectronic…