Materials Literature
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Abstract The hot-wire silicon chemical vapor deposition (CVD) was approached by the new concept of the theory of charged clusters (TCC). The role of a hot wire is to enhance the rate of negative surface ionization producing negative ions. These ions induce nucleation and produce negatively charged silicon clusters, wh…
The Curie temperature TC of La(FexSi1−x)13 is increased by a partial substitution of Ni for Fe. On the contrary, TC is decreased by a partial substitution of Cr or Mn. In addition, a partial substitution of Ce for La in La(FexMnySi1−x−y)13 causes the further decrease of TC. As a result, La0.65Ce0.35(Fe0.85Mn0.03Si0.12…
Conductive-atomic force microscopy has been successfully used for characterizing recorded marks on commercial digital versatile disk and Blu-ray disk. Nano recorded marks beyond diffraction limit are imaged with high spatial resolution and excellent contrast of conductivity. The smallest mark size resolved is around 2…
The gelation properties of a zinc porphyrin bearing peripheral urea groups (1 x Zn) were evaluated in the absence and the presence of several diamines. In aromatic solvents such as benzene, toluene and p-xylene, 1 x Zn only provided the precipitate. In contrast, 1 x Zn with 0.5 and 1.0 equiv. of piperazine formed gels…
The proton and metal complex equilibria of trans-cyclohexane-1,2-diamine-N,N,N',N'-tetrakis(methylenephosphonic acid) (CDTP) with lanthanide(iii) ions, where Ln(III) = La(III), Nd(III), Sm(III), Eu(III), Gd(III), Tb(III), Ho(III) and Lu(III) were studied. The stoichiometry, protonation and complex formation constants…
Electrical, thermoelectric, and structural properties were studied in transition metal ion-substituted : , , and . Structural analysis showed that a continuous series of solid solutions with no intermediate phases are forming over a wide range with substitutions of Mn and Ni, whereas the maximum Cu content is 30% from…
The oxygen stoichiometry, conductivity, and thermal expansion behavior of lanthanum strontium copper iron oxide (La0.7Sr0.3Cu0.2Fe0.8O3−δ) have been investigated because of its potential application as a cathode material for intermediate temperature solid oxide fuel cells (IT-SOFCs). The relative oxygen non-stoichiome…
A SiC powder of median size 0.8 μm was mixed with polyacrylic acid (PAA, dispersant) in a 0.3 mol/l-R(NO3)3 solution (R=Yb, Y, Gd, Sm, Nd and La) at pH 5 to adsorb uniformly the sintering additive (R3+ ion) on the SiC surface. The aqueous 30 vol% SiC suspension with 0.52 mass% PAA and 1.50 mass% R2O3 (as R(NO3)3), rel…
The study deals with changes in clay mineral associations with soil development and related implications for land users in the Lusikisiki area of the Eastern Cape Province of South Africa. Fifteen profiles, encompassing all major soil forms in the region, were investigated. The pedons developed from pre-Jurassic sedim…
This paper, a review of the state of the art of the drying process in wet porous media, presents an overview of thermodynamic relations in heat treatment of synthetic fiber fabrics. Heat and mass transfer in wet porous media are coupled in a very complicated way. The structure of the solid matrix varies widely in shap…
Abstract Density functional theory (DFT) calculations were carried out to characterize the optimal site of the protons and the precise protonation state in the polyoxometalate (POM) anions [V 13 O 40 ] 15− and [H 12 V 13 O 40 ] 3− . Six kinds of possible protonated stable isomers with the whole Keggin anion units are…
Acoustic waves at the interface between a polymeric solid and a glass-forming liquid are studied through impulsive stimulated thermal scattering (ISTS), a photoacoustic method. The transverse character of the interface waves provides a unique window into the shear relaxation dynamics of supercooled liquids. Real and i…
The effect of annealing at 1400 ˚C in argon on the bond structure of graphite ball milled for 100 h at 400 rpm in polar (water) and in non-polar (n-dodecane) liquids was investigated primarily by near-edge X-ray absorption fine structure spectroscopy (NEXAFS) and transmission electron microscopy (TEM). Carbon K-edge N…
Diels-Alder reaction of ethynyl p-tolyl sulfone with 1,3-dienes gave the corresponding tosyl-1,4-cyclohexadienes. The resulting adducts could be converted into 4,7-dihydro-2H-isoindole derivatives including bicyclo[2.2.2]ocatadiene(BCOD)-fused pyrrole as an isoindole equivalent.Tetrabenzoporphyrin and its derivatives…
It was found that the lower photoluminescence of hydrothermal under excitation is mainly due to the presence of . The electron paramagnetic resonance spectra confirmed the existence of in hydrothermal , and the was difficult to eliminate completely by calcination in air. The emission spectra showed the induced redunda…
In order to evaluate the deterioration characteristics during the lifecycle of bridge rubber bearing, a series of long-term accelerated exposure tests are performed on four kinds of rubber materials widely utilized for bridge bearings. Different degradation factors are applied in these tests, such as thermal oxidation…
A thermoelectric generator (TEG) usually works in dynamic operating conditions due to the time change, in real applications, of the electric load and hot or cold temperatures. Thus understanding transient thermal and electrical behavior of the device, besides the steady-state behavior, is important in order to investi…
Improvement of Electromigration Lifetime of Submicrometer Dual-Damascene Cu Interconnects Through Surface Engineering, Vairagar, A. V., Gan, Zhenghao, Shao, Wei, Mhaisalkar, S. G., Li, Hongyu, Tu, K. N., Chen, Zhong, Zschech, E., Engelmann, H. J., Zhang, Sam
The corrosion of pure chromium was studied in four molten glasses, using both scanning electron microscopy and electrochemical methods to characterize the metal/glass interactions. It is shown that direct immersion of chromium into glass does not allow obtaining a protective oxide scale, even if the glass contains oxi…
Pd metal supported on Cs2.5H0.5PW12O40 is an efficient bifunctional catalyst for the one-step conversion of acetone to methyl isobutyl ketone in gas and liquid phase.