Materials Literature
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Ternary cadmium selenium telluride quantum dots (CdSe(1-x)Tex, x = mole fraction of tellurium) have been prepared for potential use as constant-size biolabels with tunable fluorescence emission in the far-red and near-infrared (650-850 nm) spectral range. In contrast to particle size tuning reported for binary dots, w…
Abstract Four models for the component dynamics in polymer blends are briefly reviewed, with an emphasis on their ability to describe anomalous segmental relaxation behavior, secondary relaxations in blends, mixtures which include small molecules, and properties in the concentration limits of probe molecules and neat…
For materials such as stainless steel, it is well known that the surface condition (roughness) can have an effect on corrosion loss or pitting as a function of exposure time. Although some isolated observations exist of this effect for mild steel under marine immersion, there appears to have been no systematic investi…
Self-assembled copper nanowires were deposited on native oxide Si(100) substrates using glancing angle deposition with and without substrate rotation. Wire morphology, texture and crystallographic orientation are strongly dependent on the deposition parameters. A method for determining the preferred crystal orientatio…
Carbon nanotubes (CNTs), a new type of carbon material, show exceptional adsorption capability and a high adsorption efficiency for the removal of chromium(VI) ions from water over a broad pH range extending from 4.0 to 7.5. The largest adsorption capacity for CNTs occurred at pH 7.5 and attained a value of 20.56 mg/g…
The electrical response to O3 of 150-nm-thick carbon nanotube (CNT) thin films prepared by radio frequency-plasma enhanced chemical vapor deposition has been investigated at different operating temperatures starting from the room temperature. The interaction between ozone molecules and a carbon nanotube film is studie…
We present a finite-element method for numerical calculation of electromagnetic fields in silicon steel that takes into account the effect of mechanical stress on the steel's mechanical properties. The effect of the mechanical stress is considered in terms of the magnetic permeability in each element. To evaluate the…
Ultrasonic attenuation in copper and copper-aluminum samples is measured as a function of frequency and average grain size. At low frequencies the attenuation scales quadratically with the frequency and linearly with average grain size. In addition, there is a large difference in attenuation between powder metallurgy…
Thin (/spl sim/2000 /spl Aring/) films of Fe/sub 60/Co/sub 40/ have been prepared by sputtering on Si/SiO/sub 2/, Si/AlO/sub x/, AlTiC/AlO/sub x/, AlTiC/AlO/sub x//NiFe, and AlTiC/AlO/sub x//NiFeCr substrates using an alloy Fe/sub 60/Co/sub 40/ target. The structure of the films was characterized by means of X-ray dif…
Developing the texture of ceramics is one of the effective ways for improving properties. Although the magnetic susceptibility of nonmagnetic materials is very small, there is a possibility to control the crystal orientation using a high magnetic field due to a magnetic anisotropy. In this study, Si 3 N 4 ceramics wer…
The process of silver intercalation under a graphite monolayer (GM) grown on the (111) nickel single-crystal face, GM/Ni(111), is studied. The experiments were conducted in ultrahigh vacuum. The systems were formed in situ in a vacuum chamber under direct monitoring of each stage in the formation of the systems by ang…
Using an organometallic precursor, tetrakis(trifluorophosphine)platinum [Pt(PF3)4], electron-beam induced deposition of Pt thin films on a Cr-coated Si(100) substrate was investigated. Based on Auger electron spectroscopy, the Pt content reached 60 at. % for a 3 kV e-beam flux of 2.1×10−2 A cm−2, a precursor pressure…
The structure and energetics of poly(ε-caprolactone), PCL, chains confined between two platelets of organo-modified montmorillonite clay, are investigated using molecular dynamics techniques. The amount of PCL in the clay gallery has been systematically varied to assess the influence of the interlayer density on the m…
In this paper, the various models dealing with the effects of ionisation density on the thermoluminescence (TL) response (efficiency) of TL LiF dosemeters are discussed. These include (i) the Unified Interaction Model (UNIM), which models photon/electron linear/supralinear dose response; (ii) the Extended Track Intera…
We derived the relation between a figure of merit, M1, for the diffraction efficiency of acousto-optical devices and the Brillouin-gain coefficient, gB. We then estimated the values of gB and the phonon lifetime for typical As2S3 and As2Se3 chalcogenide glasses from known acousto-optical parameters. We found that the…
Abstract In the presence of a carbodiimide (DCC) a proton can dramatically speed up the reaction of α‐[Mo 8 O 26 ] 4− with aromatic amines under mild conditions and convenient bench manipulations, which results in the easy synthesis of monofunctionalized organoimido derivatives of [Mo 6 O 19 ] 2− even bearing an elect…
A method for the magnetic characterization of nanowires systems is presented. It is based on first-order reversal curves (FORC) diagrams. The experimental difficulties and peculiarities of this approach when applied to nanowire systems are also described. Two samples containing approximately 20-/spl mu/m-long Ni wires…
The process of dynamic failure of four structural ceramics subjected to unconfined uniaxial dynamic compression is investigated. The four materials examined are α‐SiC, AD 9 95 Al 2 O 3 , β‐Si 3 N 4 , and SiAlON. In each case, the dynamic failure process is studied through dynamic loading of cylindrical specimens withi…
Contemporary methods for the modification of porphyrins are presented. In association with the Third International Conference on Porphyrins and Phthalocyanines (ICPP-3) a survey of current method developments and reactivity studies is made. The review focuses on synthetic transformations of porphyrins currently in use…
The inverse relationship between film thickness and electrical resistivity of metallic films is usually studied by depositing a series of films with different thickness and measuring their sheet resistance with a four-point probe. However, the structure and uniformity of polycrystalline thin films typically depend on…