Materials Literature
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Kristalle von (Tetraaqua)(succinato)magnesium (1), (Tetraaqua)(glutarato)magnesium (2) und (Triaqua)- (suberato)magnesium (3) wurden durch Überschichten von wäßrigen Lösungen der jeweiligen Natriumsalze mit einer Lösung von MgCl2 in Isopropanol erhalten. In 1 ist eine Kettenstruktur realisiert, wobei Mg(H2O)4-Einheite…
By combining electrochemical corrosion rate measurements and spectrophotometric analysis of the electrolyte it was shown that at room temperature chromium dissolves in deaerated 0.1M Na2SO4 + H2SO4 (pH1) solution as Cr(II) and Cr(III) ions in he ratio Cr(II):Cr(III)?7:1. This process was stable over 4h without any det…
The Ce(IV) β-diketonate complexes CeL 4 [where L is txhd (2,2,6-trimethyl-3,5-heptanedionate) 1; tmod (2,2,7-trimethyl-3,5-octanedionate) 2; tmhd (2,2,6,6-tetramethyl-3,5-heptanedionate) 3] were prepared by the interaction of the sodium salt of the diketonate with cerium(III) nitrate hexahydrate in aqueous ethanol sol…
Abstract Wilkinson's catalyst [RhCl(PPh 3 ) 3 ] has been used to conjugate fish oils in high yields under very mild reaction conditions. A catalyst load of 0.35 mol% of RhCl(PPh 3 ) 3 , 0.43 mol% of ( o ‐CH 3 C 6 H 4 ) 3 P, and 0.87 mol% of SnCl 2 ·2H 2 O in ethanol solvent at 60°C for 2 d produces 82% conjugated Norw…
Growth phenomena and growth rates of crystalline particles in suspension systems are reviewed with an emphasis on the factors that distort the product crystal size distribution of products derived for the ideal mixed suspension mixed product removal (MSMPR) crystallizer. The growth of crystals in suspension systems is…
Chirality of optically active liquid crystal molecules has become an important research topic and the subject of a number of theoretical and experimental studies. We present here the results of the application of a newly developed scaling method of a steric chiral index to chiral dopant molecules and to ferroelectric…
Effect of calcium substitution on the A-site of Zr-rich lead zirconate titanate Pb(Zr 0.94 Ti 0.06 )O 3 and Pb(Zr 0.92 Ti 0.08 )O 3 is studied. It is found that the rhombohedral structure of Zr-rich lead zirconate titanate changes to tetragonal and finally to cubic with increasing amount of calcium substitution. Both…
Silica particles with different morphology have been functionalized with carbon shells by different synthetic procedures. In the key step, the bare silica particles are functionalized by a specific cationic surface polymerization with furfuryl alcohol (FA). The polyfurfuryl alcohol (PFA)/silica hybrid particles have b…
The dental casting properties of the Ti–15Zr–4Nb–4Ta alloy were compared with those of commercial pure Ti grade 2 and Ti–6Al–V alloy. Ti–15Zr–4Nb–4Ta dental castings were also surface-coated by TiN ion plating. Metal plates for complete and partial dentures, crowns and bridges were experimentally fabricated using the…
A novel mathematical model is developed that predicts the detailed macromolecular structure of an acrylonitrile-butadiene rubber (NBR) produced in an industrial emulsion polymerization. The model consists of: (i) a basic module that calculates the monomer conversion and the copolymer composition; (ii) a particle size…
The effects of mordanting method, dyeing temperature and time, as well as the type of mordants used in lac-dyeing process on the properties of silk yarn were studied. Three different mordanting methods, including pre-mordanting, simultaneous mordanting, and post-mordanting, were employed and the amount of adsorbed dye…
In a recent EPR study, Gross et al. (B. Gross, H. Dilger, R. Scheuermann, M. Päch and E. Roduner, J. Phys. Chem. A, 2001, 105, 10012) found that hydrogen atoms trapped in silasesquioxanes unexpectedly exhibit g-values significantly larger than the free-electron value, with an appreciable dependence on the external sub…
We have studied large supercells of PZT with different cation orderings and compositions using ab initio calculations. Despite the different macroscopic properties, we find similar structural motifs for all three phases. Our study shows that the polarization of PZT is mostly due to the displacement of the Pb cations,…
In order to study interface boundary structures, a three dimensional Near-Coincidence Site lattice (Near-CSL) model based on Bollmann’s O-lattice method has been proposed. Previous studies have shown that intragranular α-phase precipitates in a Ti–22V–4Al alloy have a morphology of lath-like, with two well defined fac…
INTRODUCTION: Recent discoveries of various forms of carbon nanostructures have stimulated research on their applications in diverse fields. They hold promise for applications in medicine, drug and gene delivery areas [1]. For instance, carbon nanotubes have the potential to carry drugs in the organism as they are hol…
Due to the evolution of cleanness of bearing steels, the failures observed in service conditions move from deep initiated spalling on non-metallic inclusions to surface damage due to machining marks, lack or contaminated lubrication (dents). To take into account, by the most economic way, these request for more demand…
Raman spectra in a ferroelectrics SrTiO 3 crystal in which 84% 16 O is replaced by the isotope 18 O were studied. Dielectric measurement shows that the sample undergoes a ferroelectric phase transition at 24K. Softening of a peak at 11cm m 1 was found on heating to the transition temperature T c . New peaks also appea…
The aim of this research is to investigate the effects of starch and compatibilizer contents on the thermal properties and moisture absorption of new polymeric-based biocomposite films from low-density polyethylene (LDPE) and banana starch. The compatibilizer used in this work was ethylene vinyl acetate copolymer (EVA…
Thermal shock fracture test using an infrared radiation heating (IRH) method was performed on alumina and two kinds of silicon nitride that have high and normal thermal conductivity. The thermal shock strength, R1c, and thermal shock fracture toughness, R2c, of these materials were estimated experimentally and theoret…
Alumina microspheres have been prepared by spray pyrolysis of Al(NO3)3 aqueous solutions by adjusting the flow rate of air as a carrier gas and the concentration of Al(NO3)3. A mixture of hollow α-Al2O3 microspheres in the range of 200-700 nm in diameter and solid microparticles of smaller size were prepared by pyroly…