Materials Literature
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Directing the structure and function of polythiophenes (PTs) can lead to remarkable enhancements in the electronic and photonic properties of the resultant materials, as discussed in this comprehensive review of the chemistry and synthesis of PTs. The Figure illustrates the use of heteroatom-functionalized PTs as chem…
The hydrolytic sol-gel polymerization of molecular organosilicon precursors with a rigid geometry C6H4[Si(OMe)3]2-1,4 and C6H3[Si(OMe)3]3-1,3,5 2 was investigated and compared to the results obtained with precursors having a more flexible structure C6H4RR-1,4 [R=R=CH2Si(OMe)3 3; R=R=CH2CH2Si(OMe)3 4]. Compounds 1-4 ha…
The corrosion behavior of austenitic Fe-(17 wt% to 31 wt%) Mn-(1 wt% to 9 wt%) Al-(1 wt% to 7 wt%) Cr alloys in different aqueous solutions and the corrosion protection mechanism induced by adding Al or Al and Cr, were studied by anodic polarization and Auger electron spectroscopic/x-ray photo-electron spectroscopic (…
A highly conducting partially oxidized salt of TPP[Co(Pc)(CN)2 ]2 can be obtained by electrocrystallization of TPP[Co(Pc)(CN)2 ]. The crystal is composed of one-dimensional TPP arrays surrounded by slipped-stacked one-dimensional [Co(Pc)(CN)2 ] chains. The electrical conductivity at room temperature is quite high, 120…
A B S T R A C T: Arid soils in central Iran that evolved from the weathering ofpost-Tethyan sediments contain palygorskite. Clay fractions of gypsiferous oils and their associated sediments from different landforms from central Iran were investigated. Palygorskite was the dominant silicate clay mineral in clay fractio…
The evolution and interdependence of microstructure, stress, and bonding defects of heteroepitaxial diamond films deposited on silicon substrates has been investigated by applying scanning electron microscopy, transmission electron microscopy (TEM), and micro-Raman spectroscopy to the same places in the films. For thi…
Inelastic neutron-scattering spectra were measured to obtain the phonon density of states (DOS) of nanocrystalline fcc ${\mathrm{Ni}}_{3}\mathrm{Fe}.$ The materials were prepared by mechanical alloying, and were also subjected to heat treatments to alter their crystallite sizes and internal strains. In comparison to m…
The synthesis of the one-dimensional K 2 Hg 3 Q 4 (Q = S, Se) and Cs 2 Hg 3 Se 4 and the three-dimensional A 2 Hg 6 S 7 (A = K, Rb, Cs), and A 2 Hg 6 Se 7 (A = Rb, Cs) in reactive A 2 Q x fluxes is reported. Pale yellow, hexagonal plates of K 2 Hg 3 S 4 crystallize in space group Pbcn, with a = 10.561(5) Å, b = 6.534(…
Simultaneous TG-MS (TG: thermogravimetry, MS: mass spectrometry) measurement, a mass spectrometer connected with a thermogravimetry by a transfer line and an interface or by the skimmer coupling, was used to investigate decomposition of urea.A simple decomposition reaction of urea to form ammonia and cyanic acid (or i…
A system for measuring the sensitivity of electric field sensors at UHF using a novel gigahertz transverse electromagnetic (GTEM) cell is described. The system was developed to enable calibration of UHF couplers that are used to detect insulation defects in gas insulated substations. The frequency response of a sensor…
Pierre A. Zippi, Freshwater Algae from the Mattagami Formation (Albian), Ontario: Paleoecology, Botanical Affinities, and Systematic Taxonomy, Micropaleontology, Vol. 44, Supplement 1: Freshwater Algae from the Mattagami Formation (Albian), Ontario: Paleoecology, Botanical Affinities, and Systematic Taxonomy (1998), p…
Carbon nanotubes are unique nanostructures with remarkable electronic and mechanical properties. Interest from the research community first focused on their exotic electronic properties, since nanotubes can be considered as prototypes for a one-dimensional quantum wire. As other useful properties have been discovered,…
A high-resolution computerized calorimeter capable of fully automatic operation in either ac or relaxation modes is described. Emphasis is given to a new version of the relaxation technique in which the heater power is ramped linearly in time. This improvement results in superior performance and convenience in studyin…
A method for dynamically updating the boundary conditions of atomistic simulations is presented. The lattice Green's function boundary relaxation method, originally introduced by Sinclair et al. in 1978, is extended to treat three-dimensional (3D) simulations. The boundary conditions for two-dimensional (2D) and 3D de…
Infrared (IR) spectra of well-ordered kaolinites generally show four OH-stretching frequencies, near 3697, 3670, 3652 and 3620 cm (super -1) . Raman spectra of the same kaolinites mostly show an additional band near 3686 cm (super -1) , which, in the coarsely crystalline Keokuk kaolinite, largely replaces the 3695 cm…
'In the destructive element immerse.' These words from Joseph Conrad's Stein in Lord Jim cast a shadow over twentieth-century literature. At the same time, Freud's bleak prognosis of culture's discont
We have studied the structure of lysozyme layers adsorbed at the silica−water interface using specular neutron reflection. The effect of pH on the adsorbed lysozyme layer was examined by manipulating the pH in two different cycles at two constant lysozyme concentrations of 0.03 and 1.0 g dm -3; the first cycle was sta…
Aluminum is a very important element because of its many practical applications, and XPS provides an attractive method for the investigation of, and distinguishing between, aluminum and its compounds. The Al 2p core XPS spectra shows a substantial shift (about 2 eV) between the metal peak and compound peaks, and the m…
Degradable polyurethane elastomers were synthesized using a diester chain extender. The chain extender was synthesized by a diesterification reaction between L-phenylalanine and 1,4-cyclohexane dimethanol to yield a diester, diamine. Soft segment chemistry (polycaprolactone diol, PCL and polyethylene oxide, PEO) and m…
We report in this work the characterization of La0.67Ca0.33MnO3±δparticles synthesizedvia sol–gel technology starting from an aqueous solution of the metallic nitrates and using urea as gelificant agent. The gelification is assumed to happen through the formation of polynuclear species by condensation reactions betwee…