Materials Literature
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To achieve low percolation thresholds in single wall carbon nanotube (SWCNT) and thermoplastic poly(butylene terephthalate) (PBT) composites, we have used an in situ polycondensation reaction process. The intense dispersion process achieved first by ultrasonication and followed by ultrahigh speed stirring of single wa…
Lattice-structural, magnetic, and magnetoelectric (ME) properties have been investigated for single crystals of prototypical polar ferrimagnet ${\mathrm{Ga}}_{2\ensuremath{-}x}{\mathrm{Fe}}_{x}{\mathrm{O}}_{3}$ $(0.8\ensuremath{\leqslant}x\ensuremath{\leqslant}1.4)$ as melt-grown by a floating-zone (FZ) method. Magnet…
A series of different benzaldehydes-4-tolyldiphenylamine polymers has been oxidized by 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) and tetrachloro-1,4-benzoquinone (p-chloranil), and also doped by 10-camphorsulfonic acid in order to increase their conductivity. The doped polymers were characterized by 1H NMR spect…
The conditions under which quartz microtubes 5–10 µm in diameter are formed in the course of structuring oxidized macroporous silicon are reported. It is shown that microtubes with a closed bottom can be fixed in a vertical position at equal distances from one another in correspondence with the “lattice” of macroporou…
The Laboratoire Infrarouge (LIR) of the Laboratoire d’Electronique, de Technologie et d’Instrumentation (LETI) has been involved in the development of microbolometers for several years. Therefore a first generation of a high performance technology made from amorphous silicon thermometer has been transferred to ULIS in…
Metal chelating polymers containing amide and carboxylic groups were prepared by gamma‐radiation polymerization of acrylic acid (AA) monomers in the presence of polyacrylamide (PAM). The resins obtained were loaded by copper ions and characterized by FT‐IR spectroscopy, electron spin resonance (ESR), thermogravimetric…
Weight fractions of four dominant phases (C 3 S, C 2 S, C 4 AF, and C 3 A) present in five industrial clinkers were estimated by a series of neutron and X-ray Rietveld refinements. Calculated powder patterns were derived from the structural data for monoclinic and triclinic C 3 S, monoclinic C 2 S, orthorhombic C 4 AF…
We have experimentally investigated the dynamics of the phase ordering process of bent-core molecules at isothermal conditions, forming the liquid crystalline "banana" B1 phase from the isotropic melt. In contrast to the fractal growth patterns observed for other "banana" liquid crystal phases, the B1 phase exhibits d…
Inherently conducting polymer (ICP), polyaniline, was synthesized by an in situ chemical polymerization method using camphor sulfonic acid (CSA), p‐toluene sulfonic acid (p‐TSA), and dodecyl benzene sulfonic acid (DBSA). Electronic absorption spectra of doped polyanilines were recorded using m‐cresol as a solvent. The…
Abstract Novel porphyrins and chlorins that self‐assemble in nonpolar solvents in a manner similar to that of the bacteriochlorophylls c , d , and e have been synthesized by a common protective group approach. The supramolecular assemblies have broad and red‐shifted absorption spectra in comparison to those of the mon…
A new technological process for fabricating structures with vertical walls in a thick layer of macroporous silicon on a substrate is reported. The problem of photolithography has been solved by patterning on the back side of the wafer. As a result, the silicon substrate itself serves as a mask through which certain pa…
Spectra of photoluminescence and electron spin resonance were investigated for ZnS powders annealed in the presence of metallic Ga with limited access of atmospheric air. Analysis of these spectra showed that there was no Ga impurity in the annealed ZnS powders. It was established that subsequent free access of air to…
Abstract We report on a study of magnetic cluster in Co‐doped ZnO using neutron diffraction. The samples are fabricated by the sol–gel process and the structural properties are characterized by X‐ray diffraction and neutron diffraction. The diffraction data obtained by neutron are compared with the results of X‐ray di…
Electrocopolymerization of N-methylpyrrole (NMePy) and Carbazole (Cz) was conducted in acetonitrile. Oxidative chemical random copolymerization of NMePy and Cz was also realized by Cerium (IV) ammonium nitrate (CAN) for comparison. The properties of the resulting copolymers were investigated by spectroscopic methods (…
Shake-up satellites are found in the resonant inelastic x-ray scattering spectra of $\mathrm{CuO}$ single crystals, excited by means of monochromatized synchrotron radiation with energies near the $\mathrm{Cu}$ $K$-edge. Within the limits of third-order perturbation treatment, the satellites are attributed to charge t…
An X-Ray powder diffraction study of ultra-dispersed polytetrafluoroethylene was carried out. As well as a regular polytetrafluoroethylene the ultra-dispersed form contents a high proportion of the crystalline phase. The X-ray diffraction pattern could be described with two-dimensional hexagonal unit cell [a=5.685(1)…
Single crystals of gypsum were studied in a diffractometer equipped with a CCD two-dimensional detector. The microstructure of the crystal gave wide poorly shaped spots showing sometimes curved streaks around the spots, which made the integration process very difficult, yielding a low quality structure. The crystal st…
We give a quantitative inelastic phonon Boltzmann equation theory of thermal transport in quantum well superlattices due to anharmonic three phonon processes. The thermal conductivity is calculated as a function of the mass ratio of the constituent atoms and of the superlattice period. We show that there is a competit…
Filling a gap in the literature, Practical Engineering Failure Analysis vividly demonstrates the correct methodology to conduct successful failure analyses, as well as offering the background necessary for these investigations. This authoritative reference covers procedures to reduce the occurrence of component failur…
Uncooled microbolometer technology has shown dramatic improvements in recent years as tens of thousands of imaging systems have been delivered. This paper outlines the performance limits that must be overcome to continue to achieve performance improvements.