Materials Literature
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To understand the contribution of spacer structure toward electron transfer (ET) and to regulate electronic coupling between a redox pair, porphyrin−spacer−benzoquinone molecules were prepared where spacers are trans -decalin and dihalosubstituted tricyclo[4.4.1.0]undecane including a three-membered ring. These compou…
The aim of the present work is to investigate by molecular dynamics (MD) calculations the interaction between a moving edge dislocation in an -Fe crystal and a copper precipitate. In the absence of external stresses, two edge dislocations with the same slip plane and opposite Burgers vectors within a perfect -Fe cryst…
The first metalated porphyrazinediols 11 have been prepared from (L)-(+)-dimethyl tartrate via conversion into the corresponding dispoke or 2,3-dimethoxy-2,3-butanediyl protected 2,3-dihydroxymaleonitrile, Linstead macrocyclization, transmetalation, and deprotection. Their stability is very dependent on the nature of…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTUltraselective Epoxidation of Butadiene on Cu{111} and the Effects of Cs PromotionJames J. Cowell, Ashok K. Santra, and Richard M. LambertView Author Information Department of Chemistry, University of Cambridge Cambridge CB2 1EW, England Cite this: J. Am. Chem. Soc. 20…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDirect Observation of Sol−Gel Conversion: The Role of the Solvent in Organogel FormationRong Wang, Cristina Geiger, Liaohai Chen, Basil Swanson, and David G. WhittenView Author Information Bioscience Division, Los Alamos National Laboratory Los Alamos, New Mexico 87545…
The crystal structure of partially Pd 2+ -exchanged zeolite X, dehydrated at 400 °C in a flowing O 2 stream ( a = 24.982(4) Å), has been determined by single-crystal X-ray diffraction techniques in the cubic space group Fd 3̄ at 21(1) °C. The crystal was first Pd 2+ -exchanged in a flowing stream of 0.05 M aqueous Pd(…
No doubt: A perfect coating has to look brilliant! But other properties of coatings are also most important. Coatings have to be durable, tough and easily applicable. Additives are the key to success in achieving these characteristics, even though the amounts used in coating formulations are small. It is not trivial a…
An isotropic half-metallic double exchange magnet with a direct superexchange coupling between the localized spins is studied within the spin-wave (1/S) expansion. The momentum dependence of the spin wave spectrum (including quantum corrections) in the ferromagnetic phase at T=0 is investigated. Based on the calculate…
The local magnetic moments and hyperfine magnetic fields (HFF) in the ordered alloys Fe_{15}Sn and Fe_{15}Si are calculated with the first-principles full-potential linear augmented plane wave (FP LAPW) method. The results are compared with the experimental data on Fe-M (M=Si, Sn) disordered alloys at small metalloid…
We study the possibility for a semi-infinite block of linear viscoelastic material, in homogeneous frictional contact with a non-deformable one, to slide under shear via a periodic set of ``self-healing pulses'', i.e. a set of drifting slip regions separated by stick ones. We show that, contrary to existing experiment…
(withdrawn) A combined study of magnetic susceptibility and AC resistance was performed on melt-spun Cu-Co granular magnetic ribbons. The AC resistance as a function of temperature has a sharp maximum. We associate it with a diverging correlation length at the temperature of collective freezing of magnetic moments via…
We extend the Slepyan solution of the problem of a steady-state crack in an infinite ideally brittle lattice model to include dissipation in the form of Kelvin viscosity. As a demonstration of this technique, based on the Wiener-Hopf method, we apply the method to mode III cracks in a square lattice. We use this solut…
Many disordered crystalline materials show chemical short range order and relaxation of neighboring atoms. Local structural information can be obtained by analyzing the atomic pair distribution function (PDF). The viability of reverse Monte Carlo (RMC) simulations to extract quantitative information about chemical ord…
Pulsed electrodeposition (PED) is used to prepare nanocrystalline iron with an average grain size of 19 nm and thermal stability up to 550 K. At 663 K ≤ T ≤ 783 K the kinetics of grain growth, with respect to size and size distribution, is studied in situ by means of real-time synchrotron X-ray diffraction. The Bragg…
A series of giant metal-cluster compounds, each composed of a gold core and a glutathione (GSH) adsorbate layer, have been prepared from Au(I)SG polymers and separated by gel electrophoresis, using methods reported in a recent Letter [ J. Phys. Chem. B 1998, 102, 10643−6]. Identification of the separated compounds by…
Abstract High levels of dissolved iron present in produced waters have caused concern in a number of wells in North Alaskan Reservoirs. In this paper, two dynamic "reservoir condition" scale inhibitor core flooding experiments have been conducted to simulate scale inhibitor treatments using a pre-selected commercial p…
The formation and lability of doubly bound, terminal oxygen in thin-film oxides thermally grown on Mo(110) is studied using reflection−absorption infrared spectroscopy (RAIRS) and scanning tunneling microscopy (STM) and the implications for studies of oxidation reactions on these films is discussed. Isotopic labeling…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTFormation of Patterned, Heterocolloidal Nanoparticle Thin FilmsMurali Sastry, Anand Gole, and S. R. SainkarView Author Information Materials Chemistry Division, National Chemical Laboratory, Pune 411 008, India Cite this: Langmuir 2000, 16, 7, 3553–3556Publication Date (Web):Fe…
A new method to grow thin films of Q-cadmium sulfide is described. The stoichiometry was studied by X-ray fluorescence (XRF), energy-dispersive X-ray analysis (EDAX), and X-ray photoelectron spectroscopy (XPS) techniques. The films were studied by electron diffraction. Optical absorption shows well-structured spectra…
Copolymerization of the oxozirconium cluster Zr6(OH)4O4(methacrylate)12 with methyl methacrylate results in polymers cross-linked by the cluster units. Small-angle X-ray scattering experiments show that the clusters are retained in the polymer.