Materials Literature
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We report on the transport properties, Hall effect and resistivity, of epitaxial ${\mathrm{La}}_{1\ensuremath{-}y}{\mathrm{TiO}}_{3+\ensuremath{\delta}}$ thin films. The materials, grown by molecular beam epitaxy, display a temperature independent Hall coefficient and a characteristic ${T}^{2}$ dependence of the resis…
Boride material is said as the useful material, which has high melting point and high strength. B<SUB>4</SUB>C in carbide is very hard at the next of the diamond and cubic-BN in the Mohs hardness and B<SUB>4</SUB>C has excellent chemical stability and high strength. B<SUB>4</SUB>C is being used as the polishing materi…
Catalyzed by styrene-divinylbenzene copolymer (SDB)-supported Pd (Pd/SDB) catalysts, ethyl acetate can be formed from water-containing ethanol via concomitant partial oxidation and esterification reaction. The partial oxidation reaction is carried out over palladium clusters on the catalysts. The esterification reacti…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTA Preparation Method of Thermoreversible Poly(vinyl chloride) GelsYuji AokiView Author Information Chemical Science Laboratories, Mitsubishi Chemical Corporation, 1, Toho-cho, Yokkaichi, Mie 510-8530, Japan Cite this: Macromolecules 2001, 34, 10, 3500–3502Publication Date (Web)…
Polarized micro-Raman experiments were performed on samples of aligned single-wall carbon nanotubes (SWNTs) previously characterized by scanning electron microscopy. The analysis of the different spectral shapes of the tangential G band, when the position of the laser beam changes from spot to spot on the sample, allo…
Ab initio molecular orbital calculations have been carried out for silicate, aluminosilicate, and aluminate clusters to study the NMR characteristics of various types of hydroxyls (OH) that are possibly present in hydrous silicate glasses and melts. The clusters have been optimized with the density functional theory (…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSecondary Bonding-Directed Self-Assembly of Amino Acid Derived Benziodazoles: Synthesis and Structure of Novel Hypervalent Iodine MacrocyclesViktor V. Zhdankin, Alexey E. Koposov, Jason T. Smart, Rik R. Tykwinski, Robert McDonald, and Angelina Morales-IzquierdoView Aut…
The complexes [(mu-bmtz(*-))[Cu(PPh(3))(2)](2)](BF(4)) (1) and [(mu-H(2)bmtz)[Cu(PPh(3))(2)](2)](BF(4))(2) (2) (bmtz = 3,6-bis(2'-pyrimidyl)-1,2,4,5-tetrazine and H(2)bmtz = 1,4-dihydro-3,6-bis(2'-pyrimidyl)-1,2,4,5-tetrazine) were obtained as stable materials that could be crystallized for structure determination. 1.…
Infrared and photoluminescence spectroscopies have been used to investigate the local environment of the Eu 3+ ions in luminescent sol−gel derived materials di-ureasils based on a hybrid framework represented by U(600). This host is composed of a siliceous backbone grafted, through urea cross-links, to both ends of po…
In the first part of this paper, the syntheses, structural characterization, molecular modeling, and electronic spectra for planar and nonplanar perfluoroalkylated porphyrins, (R(f))(4)P's, are reported. These studies demonstrate that the intrinsic substituent effect of the perfluoroalkyl group on the long-wavelength…
Detwinning in crystalline solids is a unique deformation mechanism partially responsible for the shape memory effect in addition to phase transformation. Owing to an insignificant dislocation process during detwinning leading to inelastic deformation, the residual strain can be recovered through a reverse transformati…
An oriented, crystalline film of cellulose I was transformed into cellulose III I by supercritical ammonia treatment. These oriented, crystalline cellulose III I films were converted into cellulose I β crystalline film by heating in air for 1 h at 230 °C. This transformation process, from cellulose III I to I β, was s…
The hydration behavior of synthetic Na-magadiite was studied by combining thermal analyses, water adsorption gravimetry, X-ray diffraction, and infrared spectroscopy under controlled water pressure. Thermal analyses reveal, at least, two distinct water populations. The water adsorption isotherm exhibits two steps at l…
The free volume theory of Gerhardt et al. 1 ( J. Polym. Sci. B: Polym. Phys. 1998, 36, 1911) is used to predict viscoelastic scaling factors describing the effect of dissolved gas content on the viscosity curves of polystyrene melts swollen with dissolved carbon dioxide and dissolved 1,1-difluoroethane. The prediction…
Stöber silica particles having diameters of ca. 100 and ca. 200 nm were prepared and silylated using trimethylsilyl N, N -dimethylcarbamate, achieving a range of surface coverage by trimethylsilyl groups by varying the amounts of silylating agent used. The efficacy of silylation was characterized in terms of hydrophob…
Simple algebraic equations show that the bulk compressibility in spinel-type compounds can be expressed by means of cation oxide polyhedral compressibilities and a term that accounts for the pressure effect on the internal oxygen position in the unit cell. The equations explain (i) the difference of compressibilities…
We investigate the initial stages of hen egg-white lysozyme (HEWL) adsorption at a charged solid interface using Brownian Dynamics simulation. The protein is modeled at the atomistic level and the adsorption surface is represented by a planar array of positively charged sites. Adsorption reactions are simulated at neu…
In general, the relaxation of polymers from a nonequilibrium state will occur only if the polymer is above the bulk glass temperature. To examine the influence of a free surface on the mobility of polymer chains, the free surface of thick, artificially roughened polystyrene (PS) films (>10 μm) was studied. Each surfac…
Hexagonal, nonperovskite HoMnO 3 oxide, containing a triangular arrangement of Mn 3+ cations, has been prepared in polycrystalline form by the thermal decomposition of metal citrates. The crystal structure has been refined from neutron powder diffraction data. Magnetic and specific-heat measurements anticipate a compl…
The effects of doping, electron coherence, and electron correlation on the transport properties of boron-doped multiwalled carbon nanotubes are studied. Substitutional boron lowers the Fermi level of the tubes and increases the number of participating conduction channels without introducing strong carrier scattering.…