Materials Literature
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V 2 O 5 /TiO 2 catalysts of varying vanadium content were prepared at various pH's and concentrations of the impregnation solution using the equilibrium deposition filtration (EDF) method. Moreover, corresponding catalysts were prepared using the conventional wet impregnation (WI) method. The above catalysts were exha…
RATIONALE AND OBJECTIVES: Immunocontrast agents used for magnetic resonance imaging require antibodies that preserve the immunoreactivity while containing a high number of chelated paramagnetic ions. METHODS: Anti-CEA F(ab')2 fragments were coupled to polylysine-Gd-DOTA and polylysine-Gd-DTPA. A paramagnetic load as h…
It is experimentally proven that the size dependence of the surface plasmon resonance of large spherical silver clusters is related to the surface optical properties of Ag. It is also demonstrated that there is a minimum size, below which this approach fails as expected, and that there is a maximum size, above which t…
Two new synthetic routes for the preparation of model Ziegler−Natta catalysts under UHV conditions are described. The exposure of metallic magnesium to TiCl 4 produced titanium chloride films with Ti in the 4+, 3+, 2+, and 0 oxidation states. Stable titanium chloride films could also be obtained by TiCl 4 and Mg codep…
The results of first principles calculations on H-silsesquioxanes (i.e., (HSiO 3/2 ) n with n = 4, 6, 8, 10, 12, 14, and 16) are reported here. Double numeric basis sets and local and nonlocal density approximations to density functional theory are employed for calculations. It is shown that use of the nonlocal densit…
Homogeneous poly(vinyl alcohol) (PVA)–silica gel polymer hybrids were prepared by in-situ hydrolysis of poly(vinyl acetate) (PVAc) in a sol–gel reaction mixture with tetramethoxysilane (TMOS). The degree of hydrolysis was evaluated by FTIR and 13 C CP/MAS NMR; it increased with an increase in the acid catalyst and rea…
Despite the fact that chemists frequently draw electron density distributions, there are few good methods for measuring this quantity, which has contributed to many longstanding controversies in chemistry. In this paper, we report the first application of element specific L absorption spectra and the “white light” sum…
The phase behaviour of the binary systems ANBC(nC)-n-tetradecane, for nC = 8, 16 and 18, was examined using DSC, paying special attention to the role of the alkoxy chain of the ANBC molecule in the D phase. The dependence of the SmC-D and D-isotropic liquid transition temperatures upon the apparent average number of p…
Poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) film surfaces were chemically surface modified to introduce one of three laminin adhesive peptides: GYIGSR, GRGDS, or SIKVAV. FEP film surfaces were first reduced with sodium naphthalide to introduce surface carbon-carbon double bonds at two reaction conditions: 2…
Thermal effects in a high-performance fusion-bonded epoxy (FBE) powder coating on steel were measured by electrochemical means. Experimental performance of the coating in immersion indicated the coating resistance as acquired by electrochemical noise methods (ENM), electrochemical impedance spectroscopy (EIS), and dir…
Abstract Microbial reduction of clay mineral structural Fe(III) decreases the swelling of nontronite gels, most importantly at intermediate oxidation states (40 to 80 cmol Fe(II) kg −1 clay). The purpose of this study was to establish whether microbial reduction of structural Fe(III) decreased the swelling of other Fe…
The influence of electron dosage on the field induced strain, dielectric constant, and polarization response has been investigated in electron irradiated poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) 50/50 copolymer. It was found that under suitable electron dosage an ultrahigh electrostrictive strain can…
Four organometallic complexes of Eu 3+ with 2,2‘-bipyridine (bipy), benzoyltrifluoroacetone (btfa), 1,10-phenanthroline (phen), and dipicolinic acid (dpic) have been prepared in Y, mordenite, and ZSM-5 zeolites by adsorbing the ligand into Eu 3+ -doped zeolites. Different samples were obtained varying the Eu 3+ conten…
Cracking, or disbonding, along the fusion boundary in dissimilar metal welds has been a persistent problem, particularly in applications where austenitic alloys are clad on to structural steels for corrosion protection. Many failures in dissimilar metal welds occur as a result of cracking along a boundary that runs pa…
The decomposition of Al 2(1‐ x ) Mg x Ti (1+ x ) O 5 ceramics in air has been studied between 900° and 1175°C for 0 lessthan equal to x lessthan equal to 0.6. The decomposition temperature versus composition x predicted using a thermodynamic model based on the regular solution approach is in satisfactory agreement wit…
alpha‐Alumina and boehmite particles were synthesized by coprecipitation followed by a hydrothermal treatment. X‐ray diffraction (XRD) indicated that alpha‐Al 2 O 3 was the major phase and coexisted with 4% of boehmite in the presence of the alpha‐Al 2 O 3 seeds. On the other hand, a single boehmite phase was obtained…
Nonlinear self-focusing of the laser beam in waveguide with nematic homeotropically aligned liquid crystalline layer is analysed theoretically and observed experimentally. The nonlinearity is caused by the reorientational effect and the stable self-trapped beams are created by the spatially periodic reorientation in t…
ZrO 2 ‐2 mol% Y 2 O 3 crystals with average grain sizes from 0.51 to 0.96 µm were prepared by sintering in air at 1400°C for 2 to 100 h. The tetragonal‐to‐monoclinic phase transformation associated with the low‐temperature degradation was investigated to clarify how the presence of water directly affects the influence…
Macromolecular crystallographic refinement has recently been made more efficient by the use of cross-validated maximum likelihood targets and torsion-angle molecular dynamics simulated annealing. In combination with automated model building methods, the amount of manual intervention required to complete and refine a s…
Tailored surface and bulk properties of polyimide films have resulted from new technology demands, e.g., the request for stronger, more dimensionally stable films with lower moisture content. The technology trends parallel the demands of the marketplace as well as the demands of manufacturing. The authors present the…