Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
We have explored a different method to increase the phase switching speed for the nanocell of the non-volatile phase change random memories. The correlation between the nanocell size and the switching speed has been investigated theoretically, and the ultrafast phase switching has been demonstrated experimentally. The…
Polymethylsilsesquioxane (PMSQ) fiber was exposed to metal chloride vapors in a controlled atmosphere or electron beam irradiation in air to promote the curing process. The cured fibers were pyrolyzed at 1273K to compare the efficiency of individual curing method. The cured fibers were investigated by FT-IR, an optica…
Highly ordered arrays of Fe antidot films were fabricated by thermal vapor deposition technique using nanoporous alumina templates. The film thickness varies from 20 up to 100 nm, and the antidots array has about 50 nm in diameter and 105 nm of periodic interspacing. Scanning electron microscopy and atomic force micro…
The ferrocobaltites Ln BaFeCoO 5 + δ ( Ln = Tb, Dy, Ho, Y) have been synthesized, and the parameters of their crystal structure have been determined. The thermal expansion, electrical resistivity ρ, and thermopower S of the synthesized compounds have been investigated in air at temperatures in the range from 300 to 11…
To lower the lightning impulse withstand voltage of gas insulated switchgear (GIS) while maintaining the high reliability of its insulation performance, it is important to define in an organized way the insulation characteristics for non-standard lightning impulse voltage waveforms that represent actual surge waveform…
Samples of Ba 1.266 Ti 2.956 Fe 7.6 Li 0.844 O 19 hexaferrite have been prepared using anatase and rutile phases of TiO 2 by classical ceramic route. A pure sample of Ba Fe 12 O 19 has also been prepared for comparison. The structural, electrical and magnetic characteristics have been studied by XRD, SEM, FTIR, two pr…
Noble metal nanoparticles have been a source of immense interest due to their novel properties and the uniqueness in properties due to high aspect ratio and quantum size effect resulting from their reduced size. In this paper, silver nanowires with an uniform diameter of 50nm were simply and successfully synthesized b…
Laser diodes with a wavelength of 808 nm obtained by the MOC-hydride epitaxy in a system of the AlGaAs alloys have been studied. Parameters of the laser diodes with symmetric narrow and asymmetric wide waveguides are compared. It is shown that the maximum optical power in these laser diodes is limited by the catastrop…
The structures of high-strength austenitic 04Kh22AG17N8M2F and 07Kh20AG9N8MF steels are studied after various heat-treatment conditions, and the relation between these structures and the mechanical and chemical properties of these steels is analyzed. The phase compositions of the steels, the morphology of phases, the…
The aim of the paper is to evidence the effect of the composition and oxygen stoichiometry on the thermodynamic, spin dynamics and magnetic properties of some micro- and nanostructured substituted manganites La1–xAxMn1–yByO3–δ (A=Ca; B=Co, Fe; x=0·33; y=0, 0·02 and 0·04). The partial molar thermodynamic properties of…
Abstract Reduction of structural Fe in smectites affects the surface chemical behavior of the clay, but the underlying mechanism and changes in clay structure are still in need of investigation, particularly with respect to changes in the tetrahedral sheet. The purpose of this study was to probe changes in the tetrahe…
An L-glutamide-derived compound with a fullerene moiety was newly synthesized by the coupling of (6,6)-phenyl-C61 butyric acid with N,N '-didodecyl L-glutamide containing an amino alkyl group. In this paper, we describe that the solubility to an organic solvent was sufficiently improved by functionalization with L-glu…
This chapter contains sections titled: Abstract Introduction Ballistic Testing Conclusion References
This highlight gives a brief summary of recent developments in the chemistry of hemiporphyrazines in the Iberian Peninsula, with a focus on triazolehemiporphyrazines. Among all porphyrinoids, hemiporphyrazines offer the advantage of exhibiting intrinsic D 2h symmetry and this feature has been exploited in the design o…
The formation and structure of the title aggregates are paradigms of the self-assembly of amphiphilic molecular building blocks in supramolecular chemistry. This review summarizes the research in the University of Barcelona on the homoassociation of the water soluble meso 4-sulfonatophenyl-and phenyl substituted porph…
We have studied two different kinds of electron tubes using a cold field emission cathode as the electron source. This cathode is an array of vertically aligned multiwall carbon nanotubes. The first device is a triode. With this device, we demonstrated the modulation at 32 GHZ of a 1.4 A/cm2 peak current density with…
A new hybrid calamitic liquid crystal material with rod-shape bisazobenzene moieties as a core has been synthesized and characterized by spectroscopic methods. The mesomorphic properties were investigated by differential scanning colorimetry, polarizing optical microscopy and X-Ray diffraction. The rod-shaped molecule…
Crystalline SiO2 clusters of nearly square shape were fabricated from amorphous silicon deposited on a clean Si(001) surface, where the deposited silicon was oxidized in the presence of atomic hydrogen and annealed in an O2 atmosphere. The side of these clusters was aligned along the [110] and [11¯0] azimuths of the S…
An overview of the effects of different nanoscale materials on the flammability of two thermoset polymers is presented and discussed in this paper. Its goal is to bring together our recent experimental results obtained for different material systems of nanoclays, nano-magnesium hydroxide (nano-Mg(OH)2) and carbon nano…
Mg alloys are ultralight but their structural applications are often limited by their poor wear and corrosion resistance. The research aimed to address the problem by laser-cladding. Cladding with SiC powder onto surface of AZ91D was carried out using Nd :YAG laser. The laser-clad surface was analyzed using the optica…