Materials Literature
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The paramagnetic insulator to ferromagnetic metal transition in lanthanum manganites and the associated magnetoresistive phenomena is treated by considering the localization due to random hopping induced by slowly fluctuating spin configurations and electron-electron interactions. The transition temperature and its va…
Tantalum (Ta) and tantalum nitride films (Ta2N and TaN) of about 50 nm thickness were reactively sputter deposited onto (100) Si substrate by using dc magnetron sputtering and their diffusion barrier properties in between Cu and Si were investigated by using sheet resistance measurement, x-ray diffraction, Auger elect…
Poly( p ‐phenylene terephthalamide) (PPTA) was prepared on a transparent indium‐tin electrode as a mechanically stable film by electrolysis of a dimethylsulfoxide solution containing PPTA polyanions. The PPTA film was electroactive because of its ionic conductivity. When an aniline derivative, o ‐phenylenediamine, was…
A composite film consisting of conducting poly( o ‐phenylenediamine) (PoPD) and insulating poly(vinyl alcohol) (PVA) has been prepared in a proportion which possesses satisfactory mechanical strength and characteristics favorable for a humidity senor. The electrical conductivity and PoPD content curves were measured,…
The reactions of HCOOH and CH3COOH on CeO2(111) and CeO2(100) were studied using temperature programmed desorption (TPD) and high resolution electron energy loss spectroscopy (HREELS). The carboxylic acids were found to dissociate on both surfaces to form carboxylates. Adsorbed formates and acetates decomposed near 60…
Photoelectron spectra of a fivefold quasicrystalline alloy ${\mathrm{Al}}_{70}$${\mathrm{Pd}}_{21}$${\mathrm{Mn}}_{9}$ and a related cubic alloy ${\mathrm{Al}}_{60}$${\mathrm{Pd}}_{25}$${\mathrm{Mn}}_{15}$ reveal two noteworthy features. The first is that the Pd $3d$ lines fall at binding energies which are 2.2 eV hig…
In Ba(Ti 1- x Sn x )O 3 solid solution, for Sn concentration x ≤0.1, the permittivity follows the Curie-Weiss law above the Curie point T c . The increase in the peak value of the permittivity at T c is due to the change in ferroelectric transition from first order to second order with increasing x . For x >0.1, so…
A nanocomposite comprised of conductive poly(aniline) chains interleaved between the layers of sol‐gel derived displays desirable properties as a positive electrode in a Li battery. The reversible capacity of (after mild oxygen treatment) is higher than the xerogel at intermediate discharge/charge rates at constant cu…
Using multi-ion interatomic potentials derived from first-principles generalized pseudopotential theory, we have studied ideal shear strength, point defects, and screw dislocations in the prototype bcc transition metal molybdenum (Mo). Many-body angular forces, which are important to the structural and mechanical prop…
The dynamics of fluid flow through nanomachines is different from in other systems in that the flow is granular (no continuum assumption) and that the `walls' move. We have performed molecular dynamics simulations of the flow of helium and argon inside carbon (graphite) nanotubes of several sizes. The fluid was starte…
In this study a phenomenological constitutive model is proposed to describe the finite, nonlinear, viscoelastic behavior of glassy polymers up to the yield point. It is assumed that the deformation behavior of a glassy polymer up to the yield point is completely determined by the linear relaxation time spectrum and th…
The effect of heat treatment on the grain size, phase assemblage, and mechanical properties of a 3 mol% Y‐TZP ceramic was investigated. Specimens were initially sintered for 2 h at 1450°C to near theoretical density; some specimens were then heat‐treated at 1550°, 1650°, 1750°, or 1850°C to coarsen the microstructure.…
Authigenic minerals play an important role in the preservation of most soft-bodied fossils. The greatest detail is preserved in apatite (calcium phosphate) but its precipitation is usually inhibited by the high concentrations of HCO 3 - in aqueous settings. Nonetheless, investigations of soft-bodied biotas have reveal…
Partial discharges (PDs) occur in the air-filled gaps of enameled wires that are touching. They erode the insulation and consequently lead to an interturn breakdown. This paper describes the failure mechanism of low voltage interturn insulation as a consequence of PDs and shows why and how it is influenced by the insu…
Twenty-one 〈110〉 symmetric tilt grain boundaries (GB's) are investigated with atomistic simulations, using an embedded-atom method (EAM) potential for a low stacking-fault energy fcc metal. Lattice statics simulations with a large number of initial configurations are used to identify both the equilibrium and metastabl…
A novel monoclonal antibody has been developed that reacts strongly with human prostatic cancer, especially tumors of high grade. This antibody (7E11C-5) is currently in Phase 3 trials as an imaging agent for metastatic disease. We have cloned the gene that encodes the antigen that is recognized by the 7E11C-5 monoclo…
The structural properties of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Mn}{\mathrm{O}}_{3+\ensuremath{\delta}}$ have been studied using neutron powder diffraction as a function of both Sr doping ($0<~x<~0.225$) and oxygen partial pressure during synthesis [2.1\ifmmode\times\else\texttimes\fi{}${1…
ABSTRACT Oxygen permeability coefficients (OP), water vapor permeability coefficients (WVP), ethylene permeability coefficients (EP), tensile strength (TS) and percent elongation (%E) at break values were determined for chitosan films plasticized with glycerin at two concentrations (0.25 and 0.50 mL/g chitosan). Film…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Jonathan Bender, Norman J. Wagner; Reversible shear thickening in monodisperse and bidisperse col…
Perovskite compositions in the system La{sub 1{minus}x}M{sub x}Co{sub 1{minus}y}Fe{sub y}O{sub 3{minus}{delta}} (M = Sr, Ba, Ca) exhibited high electronic and ionic conductivity. Substantial reversible weight loss was observed at elevated temperatures as the materials became increasingly oxygen deficient. This loss of…