Materials Literature
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Hexa- n -alkylcyclotrisiloxanes with side chains ranging from butyl up to decyl were polymerized anionically with cryptated lithium as the counterion. The polymerizations usually yielded polymers with low polydispersity, demonstrating the presence of a single growing species and the successful breaking up of aggregate…
A novel in - situ phosphating coating system is developed by predispersing an optimum amount of phosphatizing reagents into the paint formulation. Five possible in - situ phosphatizing reagents are used in the formulation of a model solvent-borne polyester−melamine enamel paint system. The new formulation is then coat…
Abstract We report about the crystal structure of Cu 12 P 20 Br 10 , a polyphosphide containing the new polyanionic phosphorus polymer [unk][P 20 2− ]. It crystallizes in the triclinic system, space group P [unk] (No. 2) with a = 9.886(2) Å, b = 13.190(2) Å, c = 14.763 (3) Å, α = 70.83(1)°, α = 82.68(1)°, γ = 80.13(1)…
A new Rietveld refinement of previously reported powder neutron diffraction data on ND 4 ReO 4 taken over a wide range of temperatures [Powell, Brown, Harnden & Reid (1993). Acta Cryst . B 49 , 463–468] is reported. Rigid-body constraints are applied to the cation geometry and occupation of a second cation orienta…
The P-type ATPases (e.g., Na+-K+-ATPase and Ca2+-ATPase) occur widely in living cells of fungi, Protozoa, plants, and animals. These ion pumps show a high degree of divergence in their primary structures but share a limited number of common amino acid residues for their ATP-catalytic function. Particularly, the amino…
The transformation of Ni/Al layered double hydroxides to Ni/Al 2 O 3 and Ni/NiAl 2 O 4 composites was studied via X-ray diffraction and electron microscopy. The Ni/Al layered double hydroxide powders, with Ni 2+:Al 3+ cation ratios varying from 0.5 to 3.3, were first synthesized by a coprecipitation route. The powders…
Abstract Different morphologies and phase transitions of ternary triblock copolymers with different block sequences (ABC and BAC) are discussed qualitatively. The interplay between interfacial energies and elastic energies of the different blocks leads to various morphologies and enhances or prevents mixing of differe…
Recent studies on proton transfer equilibria for many hydrogen bonded complexes are discussed. These studies employ various spectroscopic techniques as infrared, ultraviolet, 1H NMR, 13C NMR, 15N NMR and nuclear quadrupole resonance (NQR) spectroscopy. Special attention has been paid to Fourier transform infrared (FTI…
Chalcogenide-based switching materials have potential applications in power control and information storage. In this work, an approach has been suggested to design chalcogenide-based amorphous materials for threshold or memory switching characteristics. Using this guideline, glasses have been formed in a new chalcogen…
The influence of mixed anaerobic bacterial biofilms comprising Desulfovibrio vulgaris and Desulfovibrio desulfuricans and pure Vibrio alginolytics aerobic biofilms on cathodically protected AISI 304L stainless steel (SS) coupons was studied by means of epifluorescence microscopy, scanning electron microscopy (SEM) and…
The liquid crystal orientation on a poly(vinyl cinnamate) or poly(vinyl 4-methoxy-cinnamate) coated solid substrate exposed to linearly polarized UV light has been studied. The angular distribution of the polymer side chains and the photoreaction products was derived as a function of exposure time using a simple assum…
Cadmium titanate, CdTiO3, was prepared by the sol–gel technique in bulk and in thin film form. The thermal evolution of the gels and the phase changes were studied by thermo- gravimetric analysis (TGA), X-ray diffractometry (XRD) and Raman and energy-dispersive (EDS) spectroscopies. The morphology of the samples was o…
The Rayleigh–Plesset equation is the basis of most theoretical analyses of bubble dynamics. Surprisingly, experiment and theory do not agree on the spatial location and the value of the periodic driving pressure. In the experiment the driving pressure is located near the bubble, whereas, the theory assumes that the dr…
The dc conductivity, σ, of As2S3 glasses, pure and doped with Ag up to 1.0 at%, and As2S2.82 glass have been measured. Conduction behavior of As2S2.82 glass that contains supplementary As–As bonds was nearly the same as that of As2S3 glass. By introducing 0.1 at% of Ag into As2S3 glass, the dc conductivity markedly in…
All articles of this category Oxidation of 3,5,5-trimethylcyclohex-3-en-1-one (1) with molecular oxygen catalyzed by metal phthalocyanines (Pc) and 5,10,15,20-tetraphenylporphyrins (TPP) including Mn(II), Mn(III), Fe(II), Fe(III), Co(II), Cu(II), and Ru(II) to 3,5,5-trimethylcyclohex-2-ene-1,4-dione (2) was studied. T…
We report the discovery of superconductivity in SnSe with T c around 4.5 K at pressures exceeding 58 GPa. It is conjectured that the high-pressure superconducting modification has the CsCl structure.
Thermoelectric power, electrical resistivity, and Hall effect of p-type Bi2—xSnxTe3 (0 ≤ x ≤ 0.030) single crystals have been measured in the temperature range 4.2 to 300 K. By doping Sn atoms into the host Bi2Te3 lattice, enhancements in the thermopower and resistivity are observed in the intermediate temperature ran…
An understanding of the atomic structure at internal interfaces is of crucial importance for the electronic and structural properties of most advanced materials. Here, we present a detailed study of the atomic structure at a [001] tilt grain boundary of σ5(210) in Tio 2 (rutile). Z‐contrast imaging is used to obtain a…
The formation of hydrated electrons in neutral aqueous ultrasound-exposed solutions has been postulated previously, and several arguments were presented in favor and against their existence. In this work we use a sensitive method for detecting the presence of hydrated electrons in argon-saturated water exposed to 50 k…
The fluctuation theory indicates that the isotropic light scattering loss of amorphous polymer glass, which is used as a material for polymer optical fiber, decreases with the decrease in isothermal compressibility β and refractive index. In order to prepare low light-scattering-loss polymer glass, it is necessary to…