Materials Literature
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A number of octaphenoxyphthalocyaninato silicon complexes containing a variety of axial ligands, represented by ( OPh ) 8 PcSi ( X ) 2 (where X = chloro 3, hydroxy 4, (4-carboxybenzene) acetato 5, isonicatinato 6, propionato 7, nitrophenoxy 8 and dimethylaminoxy 9) have been synthesized using a convenient route starti…
The development of hydrogen-storage alloys used in high-power nickel/metal hydride batteries has become an important research field. Various methods of improving the high-rate dischargeability of the metal-hydride negative electrode are discussed. Our recent investigations show that optimization of rare-earth composit…
Potassium dihydrogen phosphate (KDP) doped with different mole concentrations of Urea and KCl were grown using low temperature solution growth technique. X-ray diffraction studies were carried out on the grown crystals using a Shimadzu X-ray diffractometer with CuKD radiation. X-ray study revealed that the structures…
The structure of the (001) surface of monoclinic γ-WO3 was characterized using scanning tunneling microscopy (STM), Auger electron spectroscopy (AES), and low-energy electron diffraction (LEED). The surface structure depended strongly on preparation conditions. Oxidizing by heating in O2 removed carbonaceous impuritie…
Four mesogenic homologous series have been synthesized by fixing a rigid 4-substituted phenylazo group to a resorcinol moiety. In series I and II, one phenolic -OH group is esterified by 4-n-alkoxybenzoyl groups; in series III and IV both the phenolic -OH groups are esterified by 4-n-alkoxybenzoyl groups. All the homo…
Abstract High molecular weight linear and branched poly(butylene adipate)s (PBAs) were prepared, and crystallization behavior and rheological properties were investigated. PBAs showed multiple melting behavior. Increasing molecular weight retarded the crystallization rate and increased the induction time for crystalli…
What is the complexity of inorganic crystal structures, how may it be measured, and is there a limit? We present some speculations for discussion.
This brief review sets out the facts concerning the intrinsic nature of the asymmetric background step associated with most peaks in an x-ray photoelectron spectroscopy spectrum. This step is most clearly seen if the extrinsic background is first subtracted by the methods suggested and developed by Tougaard. Recent wo…
The high-temperature coercivity of mechanically alloyed and subsequently annealed RCo5(R=Sm and Y) is studied. The annealed materials have the hexagonal CaCu5structure with 2:17 (or 1:7) regions as a minor phase. High-temperature magnetic measurements show that the coercivities of materials decrease with increasing te…
Abstract Refractory materials such as ceramics and refractory metals/alloys are widely used for structural applications in severe environments where more efficient use of energy is a prime need. Owing to properties such as high strength and refractoriness, low thermal expansion and electric conductivity these material…
Precursor effects of martensitic transformations in two well-known shape memory alloys, Ti50Ni48Fe2 and Ti50Pd34Fe16, were studied extensively by energy-filtered electron microscopy, including in-situ observations, and high-resolution electron microscopy. Energy-filtered dark-field images, where weak diffuse scatterin…
Understanding the evolution of the chemical environment and potential inside a disbonded region is essential to a quantitative risk assessment of corrosion and stress corrosion cracking of pipelines. A general reactive transport model is presented in this paper that enables calculation of the time evolution of chemist…
Heat treatment effects on the physical properties have been investigated for Sr 2 FeMoO 6 single crystals with double perovskite structure. We have evaluated the occupancy g of the Fe 3+ ion on one sublattice of the perovskite- B site by Rietveld refinement of the synchrotron-radiation X-ray powder patterns. Both the…
Interaction between two rigid molecules for three mesogenic compounds are calculated by atom-atom potential method taking into account Van der Walls' and electrostatic interactions. Stacking, in-plane and overall minimum energy configurations are studied and the most favourable arrangements for the dimers are found. T…
Y2O3 thin films were synthesized by chemical vapor deposition (CVD) using Y(acac)3.xH2O (Hacac= 2,4-pentanedione) as precursor. This work is focused on the x-ray photoelectron spectroscopy (XPS) characterization of an Y2O3 thin film deposited on glass substrate at 450 °C in N2+O2 atmosphere and subsequently annealed i…
The effect of shear stress and pressure drop rate on cell nucleation density during the foaming process has been studied using a foaming process simulator. The major part of this simulator is a test chamber that can be temperature controlled and pressurized with gas. Shear stress can be applied to the polymer melt thr…
Isobutylene was initiated using 5- tert -butyl-1,3-di(2-chloro-2-propyl)benzene/TiCl 4 in 60/40 hexane/methyl chloride: [IB] 0 = 1.0 M, [TiCl 4 ] = 0.12 or 0.24 M, [ t -Bu- m -DCC] = 0.0119 M, T = −(40−80) °C. Most polymerizations contained a Lewis base or other additive, i.e., 2,4-dimethylpyridine, 2,6-di- tert -buty…
Cobalt-ferrite nanoparticles of size 10 to 15 nm have been synthesized in water-in-oil microemulsions (i.e., reverse micelles). When the Co/sup 2+//Fe/sup 2+/ molar ratio in the precursor solution reaches 1:1 and above, the resultant oxides are identified as having the cobalt ferrite structure. By increasing the Co/su…
A new photosensitive chiral dopant based on cinnamic acid and isosorbide was synthesised. UV light action leads to E-Z photoisomerization of the dopant about C=C double bond of cinnamoyl fragment. Mixtures of the dopant with nematic and cholestric polymers were studied. It was shown, that planarly-oriented films of mi…
Abstract Benzoic acid was crystallized in a T‐mixer by mixing hydrochloric acid and an aqueous sodium benzoate solution. Crystallization kinetics were determined by population balance modeling and parameter estimation by nonlinear optimization. The evaluation of several models showed that the model has to be carefully…