Materials Literature
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Three different values (3.1, 3.2, and 3.3 eV) have been reported for the optical band gap of zinc oxide single crystals at room temperature. By comparing the optical properties of ZnO crystals using a variety of optical techniques it is concluded that the room temperature band gap is 3.3 eV and that the other values a…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMimicking Cytochrome P-450 2B4 and Aromatase: Aromatization of a Substrate Analogue by a Peroxo Fe(III) Porphyrin ComplexDiana L. Wertz, Marlene F. Sisemore, Matthias Selke, Jennifer Driscoll, and Joan Selverstone ValentineView Author Information Department of Chemistr…
We calculate the magnon modes in the presence of a vortex in a circular system, combining analytical calculations in the continuum limit with a numerical diagonalization of the discrete system. The magnon modes are expressed by the S-matrix for magnon-vortex scattering, as a function of the parameters and the size of…
In this article, we study the Faraday effect in a binary composite consisting of a dielectric matrix with metallic inclusions. We first use the replica trick together with a variational method in order to compute the effective permittivity tensor (in the quasi-static limit) of this composite in a static magnetic field…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTKinetics of II-VI and III-V Colloidal Semiconductor Nanocrystal Growth: "Focusing" of Size DistributionsXiaogang Peng, J. Wickham, and A. P. AlivisatosView Author Information Department of Chemistry, University of California Berkeley and Materials Sciences Division Law…
Interaction of brushes oriented face-to-face under compression and subsequent extension is investigated theoretically. Brushes formed by mesogenic chains with induced stiffness in the liquid-crystalline (LC) state are considered. It is shown that the contact between LC brushes composed of long folds of grafted chains…
A series of surfactant complexes of general formula, fac -ClRe(CO) 3 L (L = 9-octadecylamino-4,5-diazafluorene, 9-(4‘-hexadecylanilino)-4,5-diazafluorene, N -(4‘-hexadecylphenyl)pyridine-2-carbaldimine, and 9-heptylamino-4,5-diazafluorene), were synthesized and characterized by elemental analyses and 1 H NMR, UV−vis,…
The tetracyanoethylene (TCNE) electron-transfer salts of meso-tetrakis(4-methoxyphenyl)- and meso-tetrakis(2-fluorophenyl)porphinatomanganese(II), [MnTOMePP][TCNE].2PhMe, 1, and [MnTFPP][TCNE].2PhMe, 2, respectively, have been structurally and magnetically characterized. 1 and 2 belong to the triclinicP&onemacr; (No.…
Mesoporous silica spheres ranging from 2 to 6 μm in size were synthesized under static acidic conditions by mixed cationic−nonionic surfactant templating. The mesoporous structure of the calcined silica microspheres was characterized by X-ray diffraction (XRD) and nitrogen sorption, whereas the morphology and size of…
The simple preparation of a novel family of smart polymers based on acid−base complexes between an acidic conjugated polymer (poly(2-(4-methyl-3-thienyloxy)ethanesulfonic acid)) and various amine-containing molecules is described. The neutralization of the acid form of the polymer can be monitored optically in real ti…
The initiation, structure, and dynamics of defects control both the structure and physical properties of materials. In this work, kink band defects are systematically introduced into a lamellar poly(styrene- b- ethylene propylene) diblock copolymer by applying various rates and total strains of steady shear. However,…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTTransparent and Colored Magnetic Thin Films: (FeIIxCrII1-x)1.5[CrIII(CN)6]Shin-ichi Ohkoshi, Akira Fujishima, and Kazuhito HashimotoView Author Information Research Center for Advanced Science and Technology The University of Tokyo, 4-6-1 Komaba Meguro-ku, Tokyo 153-89…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTStructural Distortion of Dendrimers on Gold Surfaces: A Tapping-Mode AFM InvestigationAndreas Hierlemann, Joseph K. Campbell, Lane A. Baker, Richard M. Crooks, and Antonio J. RiccoView Author Information Department of Chemistry, Texas A & M University P.O. Box 300012,…
We consider a simple model for the growth of isolated steps on a vicinal crystal surface. It incorporates diffusion and drift of adatoms on the terrace, and strong step and kink edge barriers. Using a combination of analytic methods and Monte Carlo simulations, we study the morphology of growing steps in detail. In pa…
This paper describes a method to limit the band gap widening that occurs in fully substituted conjugated polymers. This is done by constructing step growth [AB] polymers where the A-units are electron rich and the B-units are electron deficient. The thiophene-based polymers were prepared by modified Stille polymerizat…
Au colloids have been prepared by reduction of metal salt with UV irradiation in the presence of dendrimers. Poly(amidoamine) dendrimers with surface amino groups for generations 0, 1, 2, 3, 4, and 5 (G0−5) have been used. The average particle sizes decrease with an increase of concentration of surface amino group of…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
The ATP-dependent enzyme dethiobiotin synthetase from Escherichia coli catalyses the formation of dethiobiotin from CO2 and 7, 8-diaminopelargonic acid. The reaction is initiated by the formation of a carbamate and proceeds through a phosphorylated intermediate, a mixed carbamic phosphoric anhydride. Here, we report t…
Gels of a poly(oxyethylene)−poly(oxybutylene) diblock copolymer in aqueous solution forming a bcc phase have been examined using small-angle X-ray scattering (SAXS) with simultaneous rheology. Application of large amplitude oscillatory shear is observed to induce macroscopic alignment of twinned bcc crystals. Alignmen…
The emission and absorption characteristics of a conjugated poly(phenylene bithiophene), 2, and a monomeric model compound, 3, were investigated as a function of [Li + ], [Na + ], [K + ], and [Ca 2+ ]. The calix[4]arene bithiophene receptor that is present in both 2 and 3 provides selectively for Na + and the absorpti…