Materials Literature
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Time-resolved two-photon photoemission (2PPE) at various photon energies is used to investigate the relaxation dynamics of hot electrons in Cu(111), applying auto- and cross-correlation techniques. The relaxation times vary from 250 fs at 0.1 eV above the Fermi level to 20 fs at 2 eV and show a strong wavelength depen…
We present results of all-electron electronic-structure calculations for semiconducting vanadium pentoxide. The calculations are based on density-functional theory within the local-density approximation and employ the augmented spherical wave method in its scalar-relativistic implementation. The electronic properties…
This paper presents research results on the electro–thermomechanical behavior of piezoelectric ceramics for use in actuator applications with an emphasis on ferroelectric fatigue. The material being investigated is a lead zirconate titanate piezoelectric ceramic with the composition PbZr0.53Ti0.47O3 (PZT-5H). Results…
The behavior of the phase transitions is mapped out as a function of the dihedral angle (\ensuremath{\theta}) or the transfer integral $(t)$ between donor columns for \ensuremath{\theta}-type BEDT-TTF [BEDT-TTF: bis(ethylenedithio)tetrathiafulvalene, abbreviated as ET] salts involving the series $\ensuremath{\theta}\e…
Ferromagnetic spin order has been realized in the LaCrO3-LaFeO3 superlattices. Ferromagnetic coupling between Fe3+ and Cr3+ through oxygen has long been expected on the basis of Anderson, Goodenough, and Kanamori rules. Despite many studies of Fe-O-Cr-based compounds, random positioning of Fe3+ and Cr3+ ions has frust…
The effective potential of an impurity in a k · p scheme is derived in two-dimensional graphite sheet. When the potential range is smaller than the lattice constant, it has an off-diagonal matrix element between K and K ′ points comparable to the diagonal element. With the increase of the range, this off-diagonal elem…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPorous Shape Persistent Fluorescent Polymer Films: An Approach to TNT Sensory MaterialsJye-Shane Yang and Timothy M. SwagerView Author Information Department of Chemistry Massachusetts Institution of Technology 77 Massachusetts Ave., Cambridge, Massachusetts 02139 Cite…
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,…