Materials Literature
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In recent years much attention has been paid to the study of radiation-induced defects in laser and luminescent materials, since they affect the optical and stimulated emission properties. Defects in : powder prepared by solid state diffusion have been studied by thermoluminescence (TL) and fluorescence measurements.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMultifunctional and Chiral Porphyrins: Model Receptors for Chiral RecognitionHisanobu Ogoshi and Tadashi MizutaniView Author Information Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-01, Japa…
The paper reviews solid-catalyzed oxidation and reduction processes for the treatment of wastewater that contains small concentrations of toxic compounds and for which separation is not economical while biological treatment is not feasible. Specifically, the objectives are (1) to understand the interactions between ca…
Mercaptopropyl-functionalized porous silicates were synthesized by the co-condensation of (mercaptopropyl)triethoxysilane and tetramethoxysilane in the presence of a cationic surfactant. The ordered hexagonal arrays of channels in the extracted product were microporous (14 Å pore diameter) and contained high concentra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxometalate-Based Molecular MaterialsEugenio Coronado and Carlos J. Gómez-GarcíaView Author Information Departamento de Química Inorgànica, Universitat de València, Doctor Moliner 50, 46100 Burjassot, Spain Cite this: Chem. Rev. 1998, 98, 1, 273–296Publication Date (Web)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhoto- and Electrochromism of Polyoxometalates and Related MaterialsToshihiro YamaseView Author Information Research Laboratory of Resources Utilization, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226, JapanCite this: Chem. Rev. 1998, 98, 1, 307–326Pu…
The absorption of dilute NO x gas was studied, at atmospheric pressure, in an industrial column packed with 25-mm plastic Pall rings. The scrubbing liquid was a dilute hydrogen peroxide solution. NO x removal efficiencies of 75−91% were obtained for gas mixtures with partial pressures of NO x in the range of 62.8−460…
The crystal and magnetic structures of the n = 3 Ruddlesden−Popper phase with the ideal composition Ca 4 Mn 3 O 10 have been studied using X-ray and neutron powder diffraction. The crystal structure at 293 K is relatively insensitive to the partial pressure of oxygen used in sample preparation. A sample prepared in ai…
We extend previous work on alkali halides by calculations for the heavy-atom species RbF, RbCl, LiBr, NaBr, KBr, RbBr, LiI, NaI, KI, and RbI. Relativistic effects are included by means of energy-consistent pseudopotentials, correlations are treated at the coupled-cluster level. A striking deficiency of the Hartree-Foc…
We present a density functional study of the structural and electronic properties of small Cu_n (n=1,4) aggregates on defect-free MgO(100). The calculations employ a slab geometry with periodic boundary conditions, supercells with up to 76 atoms, and include full relaxation of the surface layer and of all adsorbed ato…
The engineering of functional smooth muscle (SM) tissue is critical if one hopes to successfully replace the large number of tissues containing an SM component with engineered equivalents. This study reports on the effects of SM cell (SMC) seeding and culture conditions on the cellularity and composition of SM tissues…
A boron-doped hydrogenated amorphous diamondlike carbon (a-DLC:H) was prepared using a mercury-sensitized photochemical vapor deposition (photo-CVD) method. The source gases were B2H6 and C2H4. By increasing the boron doping ratio (B2H6/C2H4) from 0 to 12 000 ppm, the dark conductivity increased from ∼10−9 to ∼10−7 S/…
Transient photocurrents are investigated in ferroelectric lead zirconate titanate (PZT) films illuminated by laser pulses in the spectral range of 340–380 nm. At low electric fields, the photocurrent is sensitive to the ferroelectric polarization state and changes sign upon the polarization switching. At higher fields…
The α-Fe/R2Fe14B-type exchange-coupled NdFeB nanocomposites with a coercivity (iHc) of more than 11 kOe and energy product, (BH)max, of more than 16 MGOe have been successfully obtained on melt spun (Nd0.95La0.05)7.5+xFebalCr2B10 alloy powders, where x ranged from 3 to 3.5. It was found that a slight substitution of C…
We study macroscopic quantum coherence in antiferromagnetic molecular magnets in the presence of magnetic fields. Such fields generate artificial tunnel barriers with externally tunable strength. We give detailed semiclassical predictions for tunnel splitting in various regimes for low and high magnetic fields. We sho…
Nanocrystalline-silicon superlattices are produced by controlled recrystallization of amorphous-Si/SiO2 multilayers. The recrystallization is performed by a two-step procedure: rapid thermal annealing at 600–1000 °C, and furnace annealing at 1050 °C. Transmission electron microscopy, Raman scattering, x-ray and electr…
The engineering of functional smooth muscle (SM) tissue is critical if one hopes to successfully replace the large number of tissues containing an SM component with engineered equivalents. This study reports on the effects of SM cell (SMC) seeding and culture conditions on the cellularity and composition of SM tissues…
Liquid gas was used to produce DLC films on Cu, Al and steel substrates by DC plasma technique. The absorption in IR reflectance indicates, grown films are DLC. By deconvolution of room temperature UV-visible spectra of the films grown at 50 mtorr and 200${}^\circ$C, in addition to the spectra lines reported for CL, P…
A mean-field model of photoinduced surface reliefs in dye containing side-chain polymers is presented. It is demonstrated that photoinduced ordering of dye molecules subject to anisotropic intermolecular interactions leads to mass transport even when the intensity of the incident light is spatially uniform. Theoretica…
Nanocrystalline TiO2 has been obtained by a sol-gel process by controlling the crystal size through the water/alkoxide ratio. Raman spectra of anatase nanocrystals with average sizes of 9.5–13.4 nm are reported and the correlation between the Raman band shape (peak position and linewidth) of the main feature at 144 cm…