Materials Literature
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The molecular and basically isostructural oxo-alkoxides Ln5O(OPri)13 (Pri = 2-propyl) with Ln = Nd (1) and Gd (2) were synthesized by metathesis of LnCl3 and KOPri, in combination with stoichiometric hydrolysis, in 2-propanol-containing solvents. Er5O(OPri)133 was obtained as co-product to an erbium aluminium 2-propox…
tension ^ temperature relationships for copper and nickel samples prepared by cold crucible melting to 3%, by the levitation and sessile drop methods, and values were also obtained for iron and gold in preliminary studies. For copper, …g = Nm �1) ˆ 1:304 � 0:289 10 �3 [(y � 1083)=8C]; for nickel, …g = Nm �1) ˆ 1:781 �…
This paper discusses the drying processes of four different designs of household clothes tumbler dryer using electric power input. The relative advantages and disadvantages and the energy analyses of the dryers are presented. A parametric study was conducted to assess the effects of different variables on energy effic…
A coupled stochastic model has been developed for the prediction of solidification grain structures in centrifugal casting. The present model consists of two schemes: the cellular automaton to simulate the evolution of solidification structure and the finite volume method to calculate the heat transfer. The present mo…
Water-swellable rubbers were prepared by dispersing the superabsorbent polymer particles, sodium polyacrylate particles, in natural rubber, and their water absorption properties were investigated. Sodium polyacrylate particles were synthesized using the inverse suspension polymerization technique, and their thermal an…
Manganese(III) complexes of tetra-anionic and tetra-cationic porphyrins have been immobilised on counter-charged, surface-modified silica supports and on organic ion-exchange resins. The reactions of these supported manganese(III) porphyrin systems and analogous uncharged homogeneous systems have been examined using c…
In order to investigate the temperature rise of the workpiece during equal channel angular pressing (ECAP), a lumped heat transfer analysis was made. The main deforming zone was taken as the analysis domain. The temperature rise due to the work of plastic deformation and the frictional heat was considered. An equation…
This paper reviews the studies on the electronic structures and spectroscopic properties of sandwich-type complexes M ( Pc ) 2 and M 2 ( Pc ) 3 . The subjects discussed are as follows. (1) Electronic spectra of closed-shell Pc dimers and trimers. The complexes with closed-shell systems, such as [ Lu ( Pc ) 2 ] − , Sn…
Chemiluminescence, size exclusion chromatography, differential scanning calorimetry, thermogravimetry, and Fourier transform infrared spectroscopy were used to assess differences in oxidation rate between two different pro-oxidant systems in degradable low-density polyethylene. The pro-oxidant formulation used consist…
Solid state 29Si and 31P MAS NMR have been used to investigate the microstructural changes occurring in phosphosilicate gels during their conversion from a gel to the corresponding gel-derived glasses by heating. The studied gels have the molar compositions 10P2O5·90SiO2 and 30P2O5·70SiO2. It was found that the dried…
Lorentz correction is used to correct the intensities of X-ray scattering of single-crystal diffractometry in order to recalculate intensities to obtain structure factors. This correction reduces the intensities to zero at zero diffraction angle. Small-angle scattering is used to study the dimensions of heterogeneitie…
The layered intergrowth phases Bi4MO8Cl (M = Nb, Ta), structurally related to the well-known Aurivillius phase ferroelectrics, have been studied using SHG and a.c. impedance techniques. Both undergo a polar to centrosymmetric phase ferroelectric-type transition (Tc = 765 and 640 K for M = Nb and Ta, respectively). The…
The cationic ring-opening polymerization of tetramethylene urethane (TeU; systematic name, hexahydro-1,3-oxazepin-2-one, ( 1 )) in the melt at 67 °C with methyl trifluoromethanesulfonate (TfOMe) as the initiator yields poly(tetramethylene urethane) (poly(TeU), ( 6 )) with a regular microstructure. This [5]-polyurethan…
In this paper the influence of crack‐deflecting interlayers on the thermal shock behavior of a ceramic body has been studied. It is observed that the presence of such interlayers inhibits the penetration of cracks into the body and that the magnitude of this effect is much greater than that of internal stresses or of…
Abstract This article provides information on the applications of metal-matrix composites in engine components, brake system, and driveshaft. The components include pistons, cylinder liners, valves, pushrods, and connecting rods.
This review presents a systematic and comprehensive survey of the methods of preparation, structural studies, chemical reactivities and synthetic potentiality of dithiols.
The resistivity and the thermal stability of transparent conducting ZnO layers doped with aluminum have been correlated with the conditions of the sputtering process. Layers deposited at low rf power density (∼1.3 to 2.6 W/cm2) exhibit a low resistivity of 9×10−4 Ω cm, predominantly due to a high concentration of intr…
The formation of fluorite-type solid solutions with compositions (n)MnOx–(1 − n)CeO2 is effective in increasing adsorptive NO uptake. Solid–gas interactions for NO adsorbed onto preoxidized samples was studied by the use of diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) to elucidate the role of e…
The symmetry changes and length of the symmetry independent part of [Cu(amtrz)3]n2+ (amtrz = 4-amino-1,2,4-triazole) polymeric chains driven by different anions in crystals with BF4− (1), BF4−/SiF62− (2) and SiF62− (3) have been studied by single crystal X-ray method.
Ultrathin (<5 nm) hard carbon films are of great interest to the magnetic storage industry as the areal density approaches 100 Gb/in/sup 2/. These films are used as overcoats to protect the magnetic layers on disk media and the active elements of the read-write slider. Tetrahedral amorphous carbon films can be produce…