Materials Literature
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The resonance Raman spectrum of 45(+−3) Å diameter CdSe clusters was measured. The incident photons were resonant with the HOMO–LUMO transition in the clusters. At low temperature, one mode at 205 cm−1 is observed, as well as two overtones, with the integrated areas under these peaks in the ratio of 9:3:1. This mode i…
One method of obtaining useful information about the physical chemistry of peptide/bilayer interactions is to relate thermodynamic parameters of the interactions to structural parameters obtained by diffraction methods. We report here the results of the application of this approach to interactions of hydrophobic tripe…
Second-harmonic generation and spectroscopic absorption measurements are used to study the nonlinear-optical thin-film properties of azo dye guest molecules oriented in a polymer host by corona-onset poling at elevated temperatures (COPET). Parallel-wire electrode and needle electrode configurations are studied. The o…
Transmission electron microscopy was used to study the ordered domain structures in undoped and La/Na‐doped Pb(Mg 1/3 Nb 2/3 )O 3 (PMN), where the compositions of the doped samples were specifically chosen so as to elucidate the ordering mechanism. The results showed that the Mg 2+ ions and Nb 5+ ions are short‐range…
Abstract A wide range of natural K-, Na-, Ca- or (K + Li)-micas have been systematically examined by Raman spectrometry. The spectra are interpretable in terms of regular variations in peak positions and chemical parameters. Several vibrations give higher wavenumbers for Na-micas compared to K-micas, in accord with th…
Abstract The equation suggested in the standard method SCAN C15:62 for the estimation of the degree of polymerization (DP) of a cellulose sample from its intrinsic viscosity ([η]) in cupriethylenediamine hydroxide (cuene) solution, P 0.905 = 0.75 [η]/mL g −1 , where P is an indeterminate average DP, is incorrect. Alth…
In this paper we present a new framework, based upon percolation theory, within which various aspects of corrosion in alloy systems may be understood. We have developed a new model of selective dissolution (de-alloying) which is able to account for all the known features of the phenomenon. Monte Carlo simulations of d…
Electrochemical dissolution of in deaerated was found to produce thiosulfate ions. In addition, the presence of both chloride and thiosulfate ions above critical levels of concentration was found to cause rapid depassivation of 304 stainless steel in well‐stirred deaerated solutions. Therefore, the hypothesis was expl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanical properties of model polyethylenes: tensile elastic modulus and yield stressBuckley Crist, Christopher J. Fisher, and Paul R. HowardCite this: Macromolecules 1989, 22, 4, 1709–1718Publication Date (Print):April 1, 1989Publication History Published online1 May 2002P…
Transients associated with partial discharges in voids can be described in terms of the charges induced on the terminal electrodes of the system. The relationship between the induced charge and the properties which are usually measured is discussed. The method is illustrated by applying it to a spheroidal void located…
Anodically electrodeposited iridium oxide films from alkaline solutions were investigated for application to electrochromic devices. Micro-crystalline (diameter: 15Å) films obtained by the electrolysis of aqueous alkaline solutions containing iridium chloride, oxalic acid and potassium carbonate showed good electrochr…
Physical and chemical information on zinc corrosion layer formation, evolution, morphology, and chemical makeup is organized and presented, together with information on minerals containing zinc and other crystalline structures that might be expected to be present. The chemical reactions involved in the formation of th…
Electrochemical impedance results are presented for 550 day exposures of organic‐coated carbon steel samples. Coatings consisted of translucent pigmented and unpigmented epoxy and conventional opaque epoxy polyamide systems. Coating thicknesses ranged from 20 to 185 μm. Specimens were exposed under freely corroding co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic dilution and the viscosity of star-polymer meltsR. C. Ball and T. C. B. McLeishCite this: Macromolecules 1989, 22, 4, 1911–1913Publication Date (Print):April 1, 1989Publication History Published online1 May 2002Published inissue 1 April 1989https://pubs.acs.org/doi/1…
Calculations of the nonlinear-optical behavior are developed for model composites of nanospheres with a metallic core and nonlinear shell or with a nonlinear core and metallic shell suspended in a nonlinear medium. Optical phase conjugation is shown to be enhanced from each nonlinear region because the optical field c…
The blue phases of cholesteric liquid crystals are liquids that exhibit orientational order characterized by crystallographic space-group symmetries. We present here a pedagogical introduction to the current understanding of the equilibrium structure of these phases accompanied by a general overview of major experimen…