Materials Literature
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The refractive index is a measure of how much light slows down when it enters a medium. Conventional materials have a positive refractive index that is normally greater than 1. In his Perspective, Wiltshire explains how Shelby et al. were able to defy convention and make a negative refractive index material without vi…
Recently, a variety of aliphatic polyesters have been synthesized using hydrolases such as lipases and PHB depolymerases, and the reaction mechanism for these enzyme-catalyzed polymerization has been discussed. In this paper, we have studied the involvement of the catalytic amino acid residues of the hydrolase in enzy…
The thermal decomposition of hydrotalcite-like materials containing Zn(II), Fe(III), and Al(III) is studied. One of these samples contains zinc and aluminum in the brucite-like layers, while iron is incorporated as hexacyanoferrate(III) anions in the interlayer space. A second set of samples with Fe/Al atomic ratios i…
Theoretical calculations of 17 O and 14 N nuclear quadrupole coupling (NQC) constants (χ) and asymmetry parameters (η) for small α-helix and β-sheet protein fragments have been carried out using the density functional theory. This computational study is intended to shed light on the differences between the two major s…
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…