Materials Literature
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The phenomenology of the subglass relaxation processes as a function of temperature is investigated, taking as a probe system the β relaxation behavior of a main chain segmented liquid crystalline polyester. Real ( E ‘) and imaginary parts ( E ‘‘) of the modulus were measured as a function of temperature in isochronal…
Elevated temperature STM has been used to obtain atomic resolution images of flat regions, defect sites and step edges on the (001) surface of crystalline nickel oxide. Identification of surface lattice sites seen in empty and filled states (nickel and oxygen sites, respectively) is consistent with recent theoretical…
Abstract Styrene derivatives with pendant cyclotriphosphazenes carrying ethoxy ( 1 ) and ethylene glycol monomethyl ether groups (O(CH 2 CH 2 ) n CH 3 : 2 , n = 1; 3 , n = 2; 4 , n = 3) and their (co)polymers were prepared, and the selective binding and transport toward silver picrate by these ligands were examined. T…
Abstract Well‐defined block and graft copolymers of different types with different compositions and molecular weights, such as styrene(S)‐2‐vinylpyridine(P) diblock copolymers, SP star‐shaped block copolymers, PSP triblock copolymers, styrene(S)‐isoprene(I) multiblock copolymers of the (SI) n type, ISP triblock copoly…
Cadmium oxide films obtained by magnetron sputtering of a cadmium target in a nitrogenoxygen mixture are investigated. It is established that these films have a lower resistivity than do films obtained by other methods. It is concluded that the practical utilization of CdO films as transparent electrodes would be wort…
Abstract An elecron-transfer complex of a substituted manganese porphyrin with tetracyanoethylene was prepared. Crystal structure analysis revealed that there exists quasi-two dimensional interaction in the complex, which was shown to be a magnet with Tc of 6.0 K.
The fracture toughness of single‐crystal YAG was measured as a function of temperature in air and under vacuum using the SENB technique up to 1600°C. The measured KIC was 2.2 MPa·m 1/2 at room temperature and it increased with temperature above 1200°C, reaching a value of 4.5 MPa·m 1/2 at 1600°C in air. The effects of…
Abstract Platinum electrode modified with polyaniline by electropolymerization exhibits amperometric sensitivity to nonprotonated ammonia in aqueous solutions in the anodic range of potentials. Sensitivity of response depends mostly on the kind of doping anions used and the polarization potential applied during measur…
Abstract Miargyrite is the low-temperature monoclinic derivative of a high temperature cubic galena/halite structure. The essential features of its crystal structure (Knowles, 1959) were confirmed, but the details of the bonding changed [new space group C 121; a 12.824(1), b 4.4060(3), c 13.193(1) Å, β 98.567(6)°]. Th…
The potential for high‐efficiency energy conversion is one of the principal factors driving the development of fuel cell systems. High fuel utilization and high operating voltage are required in order to obtain high efficiency. Analysis shows that the efficiency of a fuel cell system increases by employing multistage…
5-Pregnen-3beta-ol-20-one (pregnenolone), 4-pregnene-3,20-dione (progesterone), 5-pregnene-3beta,21-diol-20-one (21-hydroxypregnenolone), 4-pregnen-21 -ol-3,20-dione (cortexone), 5beta-pregnane-3,20-dione, 5alpha-pregnane-3,20-dione, 5beta-pregnan-3alpha-ol-20-one, 5beta-pregnan-3beta-ol-20-one, 5beta-pregnane-3beta,1…
La corrosion d'alliages Ni-Cr dans le verre fondu a ete etudie par les methodes electrochimiques classiques. Apres la determination des proprietes electrochimiques du verre sur electrode de platine, des mesures de potentiel de corrosion, de polarisation anodique et cathodique et de resistance de polarisation ont ete e…
All articles of this category The synthesis of new primary hydroxy- and aminotetrathiafulvalenes is described. The hydroxy derivatives 3a and 3b were synthesized from protected TTF thiolates while the amino derivatives 14a, 14b and 17 were prepared from the corresponding hydroxyTTFs using Gabriel synthesis or azide re…
Abstract The new mineral gordaite [14] from the Sierra Gorda, Chile, has chemical composition NaZn 4 (SO 4 )(OH) 6 Cl · 6H 2 O and crystallizes trigonal with space group P [unk]. The lattice parameters are a = 8.3556(3) Å and c = 13.025(1) Å. The structure was determined using direct methods and difference Fourier map…
For Lactobacillus pentosus D-lactate dehydrogenase, the binding of 2-ketoacids is markedly stabilized through interactions between the protonated imidazole of His-296, an acid/base catalyst of the enzyme, and the carbonyl oxygen of 2-ketoacids. The replacement of Arg-235 with Gln destabilized the inhibitory binding of…
The reduction of nickel (Ni 2+ ) and copper (Cu 2+ ) to their metallic forms is reported for Ni−Al and Cu−Al layered double hydroxides (LDHs). Ethylene glycol is used as the reducing agent (the so-called polyol process). The degree of reduction of both cations was found to be dependent on the time and temperature of t…
La corrosion du chrome a 1173K en atmospheres oxydantes, oxydantes-carburantes, oxydantes-nitrurantes, et oxydantes-carburantes-sulfurantes a ete etudiee a l'aide des melanges appropries de C, CO 2 , SO 2 et N 2 , ou H 2 O, H 2 et N 2 . Dans tous les melanges gazeux utilises la phase Cr 2 O 3 est toujours thermodynami…
PURPOSE: To evaluate the intratumoral distribution of liposome-encapsulated doxorubicin. MATERIALS AND METHODS: Tumor-bearing livers of 24 mice were studied with in vivo fluorescence and electron microscopy after injection of liposomal doxorubicin in the hepatic artery, portal vein, or tail vein. Distribution and upta…
The adsorption and thermal stability of vinyltriethoxysilane (VTES) was studied on a γ-Al 2 O 3 surface. Adsorption occurs near room temperature with the production of ethanol from the reaction with isolated surface Al OH groups, producing the surface species Al O Si(OC 2 H 5 ) 2 CH CH 2 . As the surface is heated, de…
The effect of thermo-oxidative aging on physical properties viz. modulus, tensile strength, elongation at break, tear strength and hardness of rice husk ash (RHA) and commercial fillers in ENR compounds have been studied. While the modulus and hardness increased with aging, other properties, i.e., tensile strength, el…