Materials Literature
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All articles of this category Syntheses of two novel classes of water soluble phthalocyanines substituted with propionic acid or O-ethyl, methyl-phosphonic acid groups are described. These compounds have applications in the field of photodynamic inactivation of cancer cells and viruses.
The synthesis and characterization of cyclic main chain liquid-crystalline oligomers based on 1-(4-hydroxy-4′-biphenyl)-2-(4-hydroxyphenyl)butane (TPB) with 1,7-dibromoheptane (TPB-7(c)] are described. These oligomers were synthesized by the phase transfer catalysed polyetherification of TPB with 1,7-dibromoheptane un…
Shear-induced homogenization of semidilute solutions of polybutadiene (PB) and polystyrene (PS) with dioctylphthalate as a solvent was studied as a function of temperature T, polymer compositions at a fixed total polymer concentration of 3.3 wt%. The drop of homogenization temperature ΔTc(S) as measured in the increas…
The reaction of KCa[Cr(C2O2S2)3]·6H2O (C2O2S2= dithiooxalate) and [NiL][ClO4]2(L = racemic 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane) in the 1:3 molar ratio gave a chromium(III)trinickel(II) complex [Cr(C2O2S2)3(NiL)3][ClO4]3. It crystallizes with two dimethylformamide and two PriOH molecules in the…
Abstract The mechanically induced changes in structure and magnetic properties of zinc ferrite were investigated by using the Rietveld analysis and Mössbauer spectroscopy. The formation of the spin arrangement in mechanically activated zinc ferrite is connected with a redistribution of the cations in the close‐packed…
Electrical conductivity and the Seebeck coefficient of compositions in the system Y[sub 1-y]Ca[sub y]MnO[sub 3] and La[sub 1-y]Ca[sub y]MnO[sub 3] were studied to determine the mechanism of electrical transport and defect structure. Electrical conduction appeared to occur via a small polaron hopping mechanism for comp…
Recent versions of PSPICE, a personal computer implementation of the SPICE circuit simulation computer software program, have the capability of simulating the hysteresis loops of magnetic materials. In order to model the hysteresis loop of a particular manufacturer's magnetic core material, the values of five paramete…
The dispersive component of the surface free energy, the nondispersive interaction, with polar liquids were determined for cellulose, cellulose acetate and cellulose grafted with alkyl ketene dimer (AKD). and were calculated in the dry state as well as the fully hydrated state by the two liquid contact angle method. w…
The complexes [MnII(L2)2]l2·2MeOH 1 and [CuIII(L1)]2 have been synthesized by a template-like reaction between S-methylisothiosemicarbazide and pentane-2,4-dione, with MnCl2 and Cu2(MeCO2)4·2H2O, respectively, in MeOH by air oxidation; both species have been characterized by X-ray crystallography.
Abstract The influence of thermoplastic polyurethane (TPU) elastomer on the rigidity of polyacetal (polyoxymethylene, POM) was studied by determining heat deflection temperature (HDT). The higher the content of TPU in the POM/TPU blend, the lower the HDT of the blend, as would be expected. A comparative study of the r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSide-chain liquid crystalline poly(N-maleimides). 5. Dielectric relaxation behavior of liquid crystalline side-chain and amorphous poly(N-maleimides). A comparative structural studyF. Romero Colomer, J. M. Meseguer Duenas, J. L. Gomez Ribelles, J. M. Barrales-Rienda, and J.…
New intercalation compounds, M1–xPS3(G)2x(H2O)y(M = Mn, Cd) have been synthesized, where G denotes the 4-[4-(dimethylamino)-α-styryl]-1-methylpyridinium cationic chromophore. The non-linear optical properties of these materials were studied by the Kurtz powder technique. Second-harmonic generation has been evidenced,…
The relation between the flexural rigidity of a plain-woven fabric and the fabric and yarn parameters, such as thread spacing and crimp, yarn flexural rigidity, etc., is discussed. Some experimental data to test the theory are presented.
In this study, the inhibiting effect of amino acids on the corrosion of cobalt in H2SO4 was investigated. Nineteen amino acids with different properties were used. Corrosion rates were determined by extrapolating anodic and cathodic Tafel regions to the corrosion potential and by the linear polarisation method. The be…
This is the second paper reporting results of systematic studies of the nonstoichiometry and the cation tracer diffusion in quaternary oxide spinels comprised of Co, Fe, and Mn cations. In the first paper, point defects and cation tracer diffusion were discussed for compositions of the type (CoxFe2yMny)3−δO4 (x + 3y =…
Abstract The effect of pH and temperature of aqueous solution on hydration of MgO in a batch laboratory reactor was investigated. The experiments were carried out at the temperatures of 120 and 140 °C, pH of cool solution was changed from 10 to 13. It was found that even a small amount of added base substance influenc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of nitrogen base ligation on the rate of reaction of [5,10,15,20-tetrakis(2,6-dimethyl-3-sulfonatophenyl)porphinato]iron(III) hydrate with tert-BuOOH in aqueous solutionMichael J. Beck, Enona Gopinath, and Thomas C. BruiceCite this: J. Am. Chem. Soc. 1993, 115, 1,…
Tests carried out for HV and MV equipment are described. They have been designed to represent an equivalent stress level designed to represent an equivalent stress level borne over 25 years in a modern system and provide a good compromise between cost and representativeness. Twenty years of experience shows that the t…
The evolution of ferroelectric domain structure is considered as an example of kinetics of phase transformation process. Some analogies are revealed between crystal growth and domain kinetics in model uniaxial ferroelectrics. Within this approach the mechanisms of arising regular shaped, chaotic and fractal-type domai…
This paper reports on the solvatochromism of a new typical merocyanine dye of stilbazolium betaine. Solvatochromic absorption and fluorescence energy shifts of 2-(4-hydroxystyryl)-1-methylpyridinium betaine {4-[2-(1-methyl-2-pyridinio)vinyl]phenolate}, M, in 10 polar solvents are 15.0 and 6.0 kcal mol–1(1 cal = 4.184)…