Materials Literature
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Vinyl polymers containing oligothiophenes, e.g. 2,2′ : 5′,2″-terthiophene and 2,2′ : 5′,2″ : 5″,2‴-quaterthiophene, as pendant groups have been found to constitute a novel class of potential electrochromic materials. The electrochemically doped polymers undergo reversible, clear colour changes from bluish purple to pa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew strontium borate halides: Sr5(BO3)3X (X = F, Br)Theodore Alekel III and Douglas A. KeszlerCite this: Inorg. Chem. 1993, 32, 1, 101–105Publication Date (Print):January 1, 1993Publication History Published online1 May 2002Published inissue 1 January 1993https://pubs.acs.or…
Hydrogen bonding between ions has been used to engineer specific structural features into two novel crystalline materials with nonlinear optical properties, (S)-1-phenylethylammonium 3-hydroxybenzoate and (S)-l-phenylethylammonium 4-hydroxybenzoate; their crystal structures are reported and the importance of their hyd…
The operation of water reactor nuclear power plants provides a significant fraction of the world's electric power generation. At the end of 1992, approximately 360 such plants were in operation, representing a total generating capacity of 320 GWe. As these plants age, and as new designs evolve, the impact of environme…
The symmetry of the graphite crystal implies that each carbon atom has an electric quadrupole moment associated with it. This atomic moment may have a significant influence on the location of adsorbed molecules on a graphite surface and on the adsorption energy. A novel experiment, involving the measurement of the eff…
Various pure and yttrium-containing alumina aerogels have been synthesized and characterized by different techniques. The presence of yttrium promotes the thermal resistance of solids, as demonstrated by X-ray diffraction (XRD) and Brunauer–Emmett–Teller (BET) surface measurements. Yttrium allows the aerogel structure…
The title compound has been isolated and is characterized by NMR and X-ray diffraction.
Abstract Recent developments in the formulation of detergents have been driven by a strong consumer demand for natural and biodegradable products. Detergent manufacturers responded to this demand with corresponding products and advertising slogans such as “fully biodegradable”, “natural” or even “double natural” to ou…
Abstract Farblose, plättchenförmige Kristalle von RbBS 3 (P2 1 /c, a=7,082(2) Å, b=11,863(4) Å, c=5,794(2) Å, β=106,54(2)°) entstehen aus einem stöchiometrischen Ansatz von Rubidiumsulfid, Bor und Schwefel bei 600°C und anschließendem Tempern. Die zu RbBS 3 isotype Phase TlBS 3 (P2 1 /c, a=6,874(3) Å, b=11,739(3) Å, c…
Metallosilicalite xerogels of the type MOx–SiO2 where M isTiIV, VV, MoVI, WVI and SeIV have been prepared by the sol–gel method and used as heterogeneous catalysts for the epoxidation, allylic oxidation and carbon–carbon bond cleavage of alkenes, the hydroxylation of phenols, and the oxidation of alcohols to ketones b…
Space vacuum is considered as an insulation component to achieve constructional and operational advantages over totally enclosed designs for the increasing demand for higher levels of electrical power and voltages in spaceborne electrical systems. The dielectric properties of space vacuum insulations are determined ma…
Chemically pure and stoichiometric lanthanide chromites, LnCrO3, where Ln = La, Pr, Nd, Sm, Gd, Dy, Ho, Yb, Lu and YCrO3 have been prepared by the calcination of the corresponding lanthanide bis(citrato)chromium {Ln[Cr(C6H5O7)2·nH2O} complexes at relatively low temperatures. Formation of the chromites was confirmed by…
A transverse magnetic field formulation of the finite-element method for solving lightwave propagation in optical guides has been implemented. The method requires that the interface boundary conditions for E/sub Z/ and H/sub Z/ be imposed, and this is performed by solving the vector wave equation in the null space of…
Frequency-dependent node-to-node impedance function (NIF) models of power system equipment based on systematic broad frequency range (50 Hz to 1 MHz) external driving point impedance measurements are described. Such models are needed to calculate and predict the radio frequency electromagnetic (EM) noise produced by t…
The synthesis and characterisation of a series of new π-donor substituted vinyl bipyridines and their rhenium, zinc and mercury complexes {donor = 4-R2N–C6H4–[R2N = Me2N, Bun2N, (Me)(OctnN)]; (η5-C5H5)Fe(η5-C5H4-)} with large nonlinear optical properties are presented; EFISH experiments at 1.34 µm show that complexati…
The third order nonlinear optical susceptibilities χ(3) of PbO-SiO2 and PbO-B2O3 glasses have been measured by the third harmonic generation (THG) method using silica glass as reference. It is found that the third order nonlinear susceptibilities χ(3) of each series of glasses increase with increasing lead content, co…
A microprocessor implementation of the field-oriented control scheme for the permanent magnet (PM) hysteresis synchronous motor is reported. The basic principle is to decouple the torque-current component from the flux-current component so that these two components can be independently controlled. A d-q axis model of…
A new dioxovanadium(V) phosphate, Ag2VO2PO4, has been synthesised hydrothermally at 230 °C and characterized by single-crystal X-ray diffraction. The compound crystallizes in the monoclinic space group C2/m with a= 12.431(3), b= 6.298(1), c= 6.300(2)Å, β= 90.38(2)°, Z= 4 and R= 0.026. The structure consists of layers…
A possibility of the application of mercury porosimetry in the investigation on porosity in corrosion products of the carbon steel along with the degree of sealing by the use of tannin rust converters is presented. The effect of the atmospheric humidity on the rust conversion including the time of that conversion on t…
This paper reports Fourier-transform infrared (FTIR) spectra and temperature-programmed desorption (TPD) studies of CO2, CO and H2 adsorbed on ZnO/SiO2, Cu/SiO2 and Cu/ZnO/SiO2 catalysts. The adsorption of CO2 on ZnO/SiO2 catalyst at 295 K produced weakly held hydrogencarbonate species and chemisorbed carbonate struct…