Materials Literature
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Recently, titanium-tantalum alloys have been studied as implant materials for dental and orthopedic surgery. However, titanium and tantalum are difficult to mix by common arc melting and induction melting, because of their high melting point and the marked difference between their densities (Ti: 1,680 degrees C, 4.5 g…
Lead lanthanum zirconate stannate titanate (PLZST) based antiferroelectric to ferroelectric phase switching multilayer ceramic actuators were prepared by the tape casting method. The ceramic powders used were synthesized by a two-step wet chemical method using colloidal processing with a composition of Pb0.97La0.02(Zr…
The results of EPR study of inhomogeneous and incommensurate phases in improper ferroelastic crystals MgSiF6·6H2O:Mn2+ are presented. On the basis of analysis of temperature and angular dependences of experimental parameters and numerical calculations the conclusion has been drawn that at Ti1=370±0.3 K considered crys…
The Kingdom of Saudi Arabia has many natural clay deposits of the montmorillonite type which are susceptible to activation. The activation of the Saudi natural bentonite with sulfuric acid was studied experimentally and the activity of the produced clay for bleaching of corn oil was tested and compared with that of co…
In this report we discussed the manner to analyze the elasto-plastic mechanical behavior of anchor bolts and the base-plate constituting an exposure fixed-type column base. Specially, it is important to make clear the relation between the deflection of the base-plate and tensile force of anchor bolts, which is caused…
SUMMARYSuperpure aluminium has been treated by a novel atmospheric pressure non-equilibrium plasma system to study the effect on wettability and associated surface carbon content. The water contact angle significantly decreases with exposure to the plasma; further, whilst the contact angle increases with ageing after…
The effects of Ce additive on CO2 hydrogenation over Rh/SiO2 catalysts were studied. Ce addition drastically increased CO2 conversion. The main product was CO over unpromoted Rh/SiO2 catalyst, but methane over Ce promoted Rh/SiO2 catalyst. Moreover, Ce additive promoted ethanol production. The mechanism of the promoti…
The non-isothermal decomposition of NiC
The effect of RuO2 thin films on stabilizing the thermal properties of Au thin films deposited on Al2O3 substrates was investigated. Dependencies on temperature of both sheet resistance and adhesion strength were measured. The adhesion strength of the Au/RuO2 system was constant with temperature, while that of the Au/…
In order to develop a novel synthetic method for MgAl2O4 powder, a mixture consisting of Al2O3 and MgCl2 (1:10 molar ratio) was heated. As raw materials, two types of Al2O3; α-Al2O3 platelets and γ-Al2O3 powder and MgCl2 were used. When the mixture consisting of α-Al2O3 platelets and MgCl2 was heated at 750°C for 2h,…
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The electrical conductivities of seven different alumina specimens were measured after they were irradiated in the High-Flux Isotope Reactor (HFIR), Oak Ridge National Laboratory. Results indicated a moderate increase in the electrical conductivity due to the irradiation in HFIR up to 2.8 displacements per atom at 450…
Fatigue and data retention characteristics of Pb(Zr, Ti)O 3 (PZT) thin films by the selectively nucleated lateral crystallization (SNLC) method were investigated. By placing the top Pt electrode inside the grain and directly on the grain boundary, we measured and compared the electrical properties of PZT thin films ba…
A series of naphthalene-substituted triphenylene liquid crystals (LCs), viz. triphenylene-2,3,6,7,10,11-hexayl hexakis(6-alkenyloxy-2-naphthoate)s (HTPnN compounds) were synthesized and characterized. Alkenyloxy groups containing three to eleven carbon atoms were used as peripheral spacers in these liquid crystals. Th…
The degree of polymerization (DP) and the molecular weight distribution (MWD) play a special role in producing cellulose fiber by using the N-methyl morpholine N-oxide (NMMO) process. In this paper, rheological methods have been used to determine the MWD of cellulose. It is shown that the limiting compliance J0e of ce…
The corrosion-protective performance of plasma-polymerized (PP) films on metal substrates has been investigated by cyclic voltammetry, X-ray photoelectron spectroscopy (XPS), and surface potential measurements. A PP film from cyclohexane was deposited on Fe, Ni, and Cu substrates using a radiofrequency generator. A PP…
The stored energy, present in a material after deformation in the form of dislocation density, plays a crucial role in the recrystallizaton process. It can be evaluated directly using electron diffraction or indirectly using X-ray and neutron diffraction (peak profile study). The stored energy can be also calculated,…
Plasma depositions of ultra thin films from seven silicon-containing liquid monomers were investigated using a continuos wave (CW) plasma source. The deposition rate of plasma polymerized films were determined using a quartz crystal microbalance (QCM) technique while the film composition were determined spectroscopicl…
We previously reported the isolation of eleven new cardiac glycosides called cheiranthosides I-XI together with two known ones (olitoriside and erysimoside) from the seeds of Erysimum cheiranthoides L. The glycosides were evaluated for their inhibitory activity against Na+,K(+)-ATPase by comparing with typical cardiac…
Precipitation in Mg–Li–Zn ternary alloys containing 4 to 13%Li and 4 to 5%Zn (in mass%) with α or β single phases, or with (α + β) dual phases was investigated using a micro Vickers hardness measurements and transmission electron microscopy. Age hardening in the α phase alloy was found to occur, which was attributed t…