Materials Literature
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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(withdrawn) A combined study of magnetic susceptibility and AC resistance was performed on melt-spun Cu-Co granular magnetic ribbons.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.
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Two intermetallic tellurides, Mn(en) 3 ]CdSnTe 4 ( I ) and [Mn(en) 3 ]Ag 6 Sn 2 Te 8 ( II ), have been synthesized in superheated ethylenediamine solutions at 180 °C. Single-crystal X-ray diffraction analyses show that I crystallizes in triclinic crystal system, space group P 1 (No. 1) with lattice parameters a = 9.13…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTWhy Must Oxygen Atoms Be Activated from Hollow Sites to Bridge Sites in Catalytic CO Oxidation?C. J. Zhang and P. HuView Author Information School of Chemistry, The Queen's University of Belfast Belfast, BT9 5AG, UK Cite this: J. Am. Chem. Soc. 2000, 122, 9, 2134–2135P…
The measurement of contact angle on polystyrene (PS) films solvent cast on acid-cleaned glass substrates was used in conjunction with the Lifshitz−van der Waals/acid−base approach in order to investigate the surface functional-group compositions as well as the physical nature and the strength of intermolecular interac…
We have studied the NH 2 + NO reaction theoretically in order to try to deduce a theoretical “model” that will accurately reproduce both the total rate coefficient k T ( T ) and the branching fraction α( T ) of the reaction NH 2 + NO → N 2 + H 2 O (a), NH 2 + NO → NNH + OH (b), and NH 2 + NO → N 2 O + H 2 (c), where k…
Three-dimensional coordination network solids of MII[C(CN)3]2 (M = V, Cr) composition possess interpenetrating rutile-like network structures. Each [C(CN)3]- bonds to three different metal ions in a triangular array, affording a geometrical topology akin to a Kagomé lattice leading to competing spin exchange interacti…
Both convergent and divergent strategies are used to synthesize 1, a dendrimer comprising triazines linked by diamines. The convergent approach is orthogonal; neither protecting groups nor functional group manipulations are required using the building blocks selected.
Stable aqueous dispersions consisting of CdS nanoparticles having modal diameters, ranging between 2 and 8 nm, were prepared with amino-derivatized polysaccharides (aminodextrans, hence abbreviated as Amdex) as the stabilizing agents. The size, stability, and luminescence intensity of such dispersions were shown to be…
The crystal structure of selenomethionine-substituted malate synthase G, an 81 kDa monomeric enzyme from Escherichia coli has been determined by MAD phasing, model building, and crystallographic refinement to a resolution of 2.0 A. The crystallographic R factor is 0.177 for 49 242 reflections observed at the incident…