Materials Literature
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Fibers of a poly(azomethine) having hydroxyl groups within the mesogenic core have been melt extruded from the nematic phase. The polymer obtained by condensation of 1,10-bis[(4-formyl-3-hydroxyphenyl)oxy]decane and 2-methyl-1,4-phenylenediamine has a T g of 54 °C and exhibits a nematic phase from 178 to 341 °C. Due t…
Abstract (Bi 1‐ x Sb x ) 2 Se 3 ( x = 0.0 to 0.2) single crystals were prepared using a modified Bridgman method. Measurements of the Hall coefficient R H , electrical conductivity σ and Seebeck coefficient α showed that incorporation of the antimony atoms into the Bi 2 Se 3 crystal lattice results in an increase in t…
Initial results of introducing La 2 O 3 into zinc titanate, a potential regenerable desulfurization sorbent, to reduce the spalling of zinc titanate and other similar type mixed metal oxide sorbents used in hot coal-derived fuel gas desulfurization are presented. Sorbents were tested in a bench scale high temperature−…
The paper describes kinetic investigations related to the development of a wet scrubbing process for SO 2 abatement from industrial waste gases: the oxidation of sulfur dioxide by tetravalent cerium in a sulfuric medium. Experiments carried out using two gas/liquid contactors and their interpretation could highlight t…
Abstract Historically, it has been difficult to directly obtain accurate air permeability measurements of open-structured textile fabrics. Although measurements can be made using a nonstandard pressure differential between the two fabric surfaces, this technique may not be reliable. An alternative method of determinin…
Abstract The experimental results of a study of the effect of supersaturation and temperature on the growth morphology of ammonium oxalate monohydrate [(NH 4 ) 2 C 2 O 4 H 2 O; AO] single crystals obtained from aqueous solutions at 30 and 40 °C and supersaturation up to 9% are presented. The observations are analysed…
New members of the Ln2–xSrxNiO4 ±δ(Ln = La, Nd, Sm and Gd) solid solution series have been synthesized for x1.0. The upper limit of x is ca. 1.6 for La and 1.67 for Nd, Sm and Gd. The tetragonal K2NiF4-type crystal structures of these phases have been Rietveld refined using X-ray powder diffraction data. Thermogravime…
Cobalt nitrosyl tetraphenylporphyrins CoT(p-X)PP(NO) (X = H, 1; OMe, 2; NO2, 3) substituted at the meso phenyl para position were prepared and the metal−NO interaction was probed using cyclic voltammetry and reflectance infrared spectroelectrochemistry. Electron-donating (OMe) and -withdrawing (NO2) groups were found…
(3-Hydroxybenzyl)hydrazine and methylhydrazine have been found to be potent slow-binding inhibitors of the pyridoxal 5-phosphate (PLP)-dependent enzyme gamma-aminobutyric acid aminotransferase (GABA-AT). Both compounds follow mechanism A (Morrison, J.F.; Walsh, C. T. Adv. Enzymol. 1988, 61, 201-301) which does not inv…
One of the major concerns in using Fiber Reinforced Composites (FRC) in applications that might be subjected to fire is their resistance to high temperature. Some of the fabrics used in FRC, such as carbon, are fire resistant. However, almost all the resins used cannot withstand temperatures higher than 200 degrees ce…
A layered ammonium zinc molybdate material was derived by a novel room-temperature chimie douce synthesis technique from a metastable mixed oxide prepared by calcination of a layered double hydroxide (LDH). The compound obtained, (NH 4 )HZn 2 (OH) 2 (MoO 4 ) 2, is highly crystalline and retains the rhombohedral symmet…
In the last few years there has been a considerable expansion in the application of Magnetic Force Microscopy (MFM). MFM images the stray field from the sample, offers excellent lateral resolution (/spl sim/10 nm) and requires minimal sample preparation. The interaction between the stray field from the sample and from…
In evaluating the performance of nonwoven fabrics, pore characteristics provide important information concerning fluid permeability, filtration and mechanical properties of the fabrics. This paper reports new approaches of measuring pore characteristics using image analysis. The image processing techniques for identif…
Simple tension tests were performed to investigate the load-elongation behavior of two geotextiles, a woven polyester and a nonwoven polypropylene, under monotonic and cyclic loading conditions. Creep tests under constant load were also performed in order to examine the time-dependent properties of both geotextiles. A…
Alkenyl succinic anhydride (ASA) is one of the reactive sizes used as cationic emulsions at wet-end of papermaking process. In order to make clear the mechanism of ASA sizing, structures of ASA components retained in handsheets were studied using model compounds and analytical techniques. The results of model experime…
Various poly(3-decylthiophene- co -3,3‘-dibutoxy-2,2‘-bithiophene)s and poly(4,4‘-didecyl-2,2‘-bithiophene- co -3,3‘-dibutoxy-2,2‘-bithiophene)s have been chemically prepared using iron trichloride as oxidizing agent in chloroform. These copolymers should combine the excellent electrical properties of alkoxy-substitut…
A novel layered titanium silicate JDF-L1 has been synthesized in an SiO2–TiO2–Na2O–H2O–H2O2 template system. It is found that the synthesis of JDF-L1 requires a relatively high alkalinity and an appropriate titanium content. The JDF-L1 samples were characterized by XRD, SEM, IR, DTA–TG and adsorption. DTA–TG studies,…
Shape memory polymers of polyurethane series have been developed. These polymers have the following features. (1) They can be molded easily similar to conventional plastics, (2) their shape recovery temperature can be set arbitrarily, and (3) they can be colored as required because they are transparent, making a wide…
Lys146 of rabbit aldolase A [D-fructose-1,6-bis(phosphate): D-glyceraldehyde-3-phosphate lyase, EC 4.1.2.13] was changed to arginine by site-directed mutagenesis. The kcat of the resulting mutant protein, K146R, was 500 times slower than wild-type in steady-state kinetic assays for both cleavage and condensation of fr…
A mixture of hard-sphere colloidal silica particles (radius 48 nm) and a nonadsorbing polymer (poly(dimethylsiloxane), radius of gyration 23 nm) is studied by means of static and dynamic light scattering near the binodal. The spinodal is determined from an extrapolation of the diffusion coefficient as measured in the…