Materials Literature
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The structure and mechanical properties of nanocrystalline aluminum alloy 1570 obtained by means of severe plastic deformation have been studied. Being tested in a temperature range from 300 to 400°C, the alloy exhibits high-strain-rate superplasticity. At 400°C, the superplasticity is manifested in a very broad range…
The elastic behavior and the pressure-induced structural evolution of a natural nepheline (K 0.54 Na 3.24 Ca 0.03 Al 4 Si 4 O 16 ) were investigated by in-situ single-crystal X-ray diffraction up to 7.5 GPa with a diamond anvil cell under hydrostatic conditions. As observed in previous studies, at room conditions the…
The thermodynamic quantities associated to the transformation from graphite to multiwalled carbon nanotubes (MWCNTs) were determined by electromotive force (emf) and differential scanning calorimetry (DSC) measurements. From the emf versus T data of galvanic cell Mo|Cr(3)C(2), CrF2, MWCNTs|CaF2 s.c.|Cr(3)C(2), CrF2, g…
Metamaterials (MTMs) are artificial structures made of periodic elements and are designed to obtain specific electromagnetic properties. As long as the periodicity and the size of the elements are much smaller than the wavelength of interest, an artificial structure can be assigned a permittivity and permeability, jus…
Rapid continuous thermal control of chemical reactions such as those for chemical vapor deposition (CVD) growth of nanotubes and nanowires cannot be studied using traditional reactors such as tube furnaces, which have large thermal masses. We present the design, modeling, and verification of a simple, low-cost reactor…
Fluorescent quantum dots (QDs, semiconductor nanocrystals) have gained increasing attention in the past decade due to their unique optical properties. In this work, we synthesized highly luminescent lipophilic CdSe/ZnS core-shell QDs under mild conditions, and encapsulated the QDs into solid lipid nanoparticles (SLNs)…
This paper reports the first total dose tests on a nanocrystalline diamond lateral vacuum field emission microelectronics (VFEM) technology. This technology operates efficiently at both low and high temperatures (200degC) and is inherently ldquohardrdquo to radiation. No measurable change in device response is observe…
Abstract 50 : 50 natural rubber (NR) and ethylene–propylene–diene monomer rubber (EPDM) blends were prepared with different contents of cashew nut shell liquid (CNSL), a natural product obtained from the shells of the cashew nut, as a plasticizer. For comparison, a commercial paraffin oil plasticizer was also used. Th…
A novel superlubric system of fullerene intercalated graphite composite is reported. First, it is clarified that fullerene intercalated graphite films exhibit an ultralow average friction force and an excellent friction coefficient µ<0.001 smaller than µ<0.002 for MoS 2 and µ\cong0.001 for graphite. Next, it is demons…
The formation dynamics of nanosized ceria in cerium nitrate(III) and hexamethylenetetramine (HMTA) solutions has been studied for the first time using UV-visible spectroscopy. The bandgap width and particle size of CeO 2 are controlled by the synthesis duration, reaction temperature, and the concentrations and molar r…
Electromigration (EM)-derived void nucleation and growth in 65-nm-node dual-damascene interconnects were investigated, and the effects of impurity doping as well as copper adhesion strength to a capping-dielectric layer (CAP) are clarified. It is found that surface-reductive treatment of the copper line improves its a…
In this paper, we present a model for the dynamic hysteresis behavior of magnetostriction in electrical steel under sinusoidal induction. The model can be used for the numerical calculation of vibrations in magnetic cores. In order to keep the calculation time of the method to an acceptable level, we developed a neura…
Small hydrogenated silicon particles with diameters smaller than 2 nm were geometrically relaxed in excited states using density functional tight-binding methods. The relaxation caused Stokes shifts and optical-absorption spectrum red shifts with the particle size increases, consistent with experimental observation. I…
Due to its fungistatic or fungicidal potential, chitosan, a high molecular-weight polymer that is non-toxic and biodegradable, has become an alternative to conventional fungicides. In addition, chitosan is reported to elicit defense mechanisms in plant tissues. In this study, we explored the in vitro fungicidal effect…
The structural changes during the phase change between the amorphous and crystalline phase in ${\mathrm{Ge}}_{2}{\mathrm{Sb}}_{2}{\mathrm{Te}}_{5}$ have been the subject of intense study due to the importance of ${\mathrm{Ge}}_{2}{\mathrm{Sb}}_{2}{\mathrm{Te}}_{5}$ in phase change memory devices. In our study, the ene…
We use density functional calculations to study the structure and the energy of formation of the surface oxygen vacancy (V O ) in a free-standing, very-thin film (VTF) of ZnO and substitutionally doped ZnO VTF. We are interested in this system because the walls of very high area oxides used in catalysis contain VTFs.…
Mechanical properties and thermal degradation of natural rubber compounds containing castor oil were studied to evaluate its suitability as plasticizer. Naphthenic oil was used as a reference plasticizer. The cure time was marginally lower in the case of castor oil mixes, probably due to the presence of free fatty aci…
Chemical treatment methods are most often used nowadays for polymer surface modification; however, new technologies are now considered, especially in physical treatment methods, as laser technologies. Infra-red lasers, like CO 2 , appear to be advantageous due to their large beam size, high efficiency, easy operation,…
In prokaryotes, DNA replication is initiated by the binding of DnaA to the oriC region of the chromosome to load the primosome machinery and start a new replication round. Several proteins control these events in Escherichia coli to ensure that replication is precisely timed during the cell cycle. Here, we report the…
The photophysics of a complex between cucurbit[7]uril (CB7) and rhodamine 6G (R6G) was investigated using single-molecule spectroscopy. On the basis of the distribution of fluorescence intensity, two stable conformations of the CB7/R6G complex were identified. Both exhibit enhanced fluorescence relative to R6G alone.…