Materials Literature
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On the basis of the changes of physical properties such as refractive index, dynamic viscosity, pH value (Table 1) and spectrum analysis (IR, l H NMR and 1 3 C NMR - Figs. 1-5) a probable reaction course (scheme A) and chemical structures of the products formed in the system consisting from urea (here: M), phenylsulfo…
Abstract Biodegradable epoxy‐polyester resins were synthesized in two steps: (1) synthesis of the polyesters with allyl pendent groups; (2) epoxidation of allyl groups in the polyesters. Polyesters with allyl pendent groups were synthesized by melt copolymerization of succinic anhydride (SA) and allyl glycidyl ether (…
Egyptian calcium hydroxide byproduct, produced as a waste material during preparation of acetylene gas, causes various ecological problems. The present work had the aim of utilising this waste material as a source of calcium oxide in the production of refractory calcium aluminate cement. Two types of calcium aluminate…
Abstract The ion pairs {[Ni(cyclam)]2+[M(mnt)2]2−} (M = Co, Ni: 1a,b), {[Ni(tmc)]2+[M(mnt)2]2−} (M = Co, Ni: 2a,b) and the solvent complexes {[Ni(cyclam)(dmso)2]2+[M(mnt)2]2−} (M = Co, Ni, mnt2− = maleonitriledithiolato = (Z)1,2-dicyano-1,2-ethylenedithiolato, cyclam = 1,4,8,11-tetraazacyclotetradecane, tmc = 1,4,8,11…
Optical second harmonic generation (SHG) measurements have been carried out on the B2 phases of three liquid crystal materials composed of conventional banana-shaped molecules (P-10-O-PIMB, P-8-O-PIMB and P-8-PIMB). Quantitative values of the second order susceptibilities dij have been deduced from SHG measurements at…
The microstructures of diffusion-bonded Cu/(0001)Al2O3 bicrystals annealed at 1000 degrees C at oxygen partial pressures of 0.02 or 32 Pa have been studied with various microscopy techniques ranging from optical microscopy to high-resolution transmission electron microscopy. The studies revealed that for both oxygen p…
Abstract The crystal structures of 2-isopropyl-benzisothiazol-3-one-7-carboxylicacid isopropyl amide and of the corresponding selenium and tellurium derivatives have been determined. In contrast to the sulfur and selenium compounds, the tellurium derivative has an unprecedented three-dimensional network structure held…
In this paper, the effect of nonsinusoidal supply voltage on the core loss and the transformer excitation current is investigated. The time-domain waveform of the transformer excitation current is calculated for a worst-case harmonic composition of supply voltage.
Undesirable effect of asymmetric drape often occurs when cutting patterns of flared skirt on cross. Out of this reason garment seams twist toward the front or back or folds form different shapes on each side of the garment and this lowers garment aesthetic appearance. The new measuring procedure for asymmetric skirt d…
We report that tissue-like structure can be formed when cells are cultured on a microporous polymer film (honeycomb film). The honeycomb films were fabricated by applying a moist air to a spread polymer solution containing biodegradable polymers (poly(L-lactic acid) (PLLA) and poly(ε-caprolactone) (PCL)) and an amphip…
Two calcium‐doped α‐SiAlON compositions (Ca 0.6 Si 10.2 Al 1.8− O 0.6 N 15.4 and Ca 1.8 Si 6.6 Al 5.4 O 1.8 N 14.2 ) were prepared by hot pressing at 1600° and 1500°C, respectively, for complete phase transformation from α‐Si 3 N 4 to α‐SiAlON. Both samples were subsequently fired at different temperatures for differe…
Abstract The hydrothermal stabilities of a low-Fe clinochlore and a high-Mg chamosite, in the presence of kaolinite, were investigated recently at T ⩽ 200°C and <mml:math xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:mnf="http://cambridge.org/core/manifest" xmlns:cup="http://contentservices.cambridge.org" xmlns:mml…
A new nanocomposite material containing approximately 50 vol % S is prepared by filling pores of bulk nanoporous carbon samples with sulfur. The initial nanoporous carbon samples are synthesized from polycrystalline α-SiC through the chemical reaction. A comparative investigation of small-angle x-ray scattering (SAXS)…
Two hydrogen and two Si-related defect centers were detected and characterized by electron spin resonance (ESR) in diamond films grown by chemical vapor deposition. Observation of hyperfine structure, combined with illumination and polishing treatments, suggests that the KUL2 and KUL9 ESR centers originate from two ch…
Highly mono-sized dye-doped liquid crystal (LC) microcapsules were prepared by the solute codiffusion method for application in photoswitchable devices. Azobenzene derivatives, which can be photoisomerized by irradiation with UV (366 nm) and visible (433 nm) light, were used as a photoresponsive dichroic dye. The micr…
A closed system incorporating FTIR continuous monitoring and GC-MS sampling has been developed to study the generation under UVA illumination of volatile photodegradation products from model plasticised and TiO2 pigmented films. The presence of the plasticiser dibutyl adipate (DBA), at levels of 0-88 phr, has been sho…
Nanosize ferroelectric powders of Pb(Zr,Ti)O/sub 3/ (PZT) have been successfully synthesized by pulsed wire discharge. This has been achieved by the evaporation of Pb, Zr, and Ti wires simultaneously. Since these metals have considerable difference at the boiling point, instant heating by using pulsed-power technology…
Abstract A sample of cobalt oxide with cobalt ions in a highly oxidative state, p‐Co 2 O 3 , was prepared from Co(NO 3 ) 2 (aq) through a precipitation by NaOH and an oxidation by H 2 O 2 . The prepared p‐Co 2 O 3 was characterized as a nonstoichiometric sample with a chemical formula of Co 3+ 0.96 Co 4+ 0.04 O 2− 1.5…
We report a detailed investigation of binary mixtures composed of members of the homologous series of (S)-4′-(2-n-alkoxypropanoyloxy)biphenyl-4-yl 4-n-alkoxy- f-cyanocinnamates. The phase transition curves for these mixtures have no minima. On the contrary, eutectic behaviour was obtained if the members of this homolo…
Abstract Oligophenylazomethines (OPAs) and the aniline‐capped OPAs (OPA's) as soluble model compounds of polyphenylazomethine (PPA) were synthesized via dehydration of 4‐aminobenzophenone in the presence of TiCl 4 or PTS as a Lewis acid. The 1 H‐NMR spectra of OPAs revealed that OPAs have some isomers, which are based…