Helical configuration of poly(iminomethylenes). Synthesis and CD spectra of polymers derived from optically active isocyanides
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Effect of Bound Water on Tensile Properties of Native Cellulose
Tensile properties of native cotton cellulose having various water contents from 0% to 50% in weight were measured. X-ray diffraction patterns of samples containing sorbed water were also measured. The dimensional change of the cross section of a single fiber was observed under a microscope. The amount of bound water…
The structural properties of synthetic Sr-åkermanite, Sr2MgSi2O7
Article The structural properties of synthetic Sr-åkermanite, Sr2MgSi2O7 was published on November 1, 1983 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 163, issue 1-4).
Fracture of ferroelectric ceramics
This paper surveys the temperature, microstructural and environmental variations of the fracture properties of ferroelectric ceramics. Earlier work shows that fracture toughness decreases on heating through the Curie temperature. There is also anomalous behavior in the strength at small crack sizes, indicative of a gr…
A carbon-bonded tris(2,2'-bipyridine)iridium(III) complex: (2,2'-bipyridinyl-C3,N')bis(2,2'-bipyridine-N,N')iridium(III) perchlorate-water (3/1)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA carbon-bonded tris(2,2'-bipyridine)iridium(III) complex: (2,2'-bipyridinyl-C3,N')bis(2,2'-bipyridine-N,N')iridium(III) perchlorate-water (3/1)G. Nord, A. C. Hazell, R. G. Hazell, and O. FarverCite this: Inorg. Chem. 1983, 22, 23, 3429–3434Publication Date (Print):November…
Surface-enhanced Raman scattering by molecules adsorbed on aqueous copper colloids
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-enhanced Raman scattering by molecules adsorbed on aqueous copper colloidsJ. A. Creighton, M. S. Alvarez, D. A. Weitz, S. Garoff, and M. W. KimCite this: J. Phys. Chem. 1983, 87, 24, 4793–4799Publication Date (Print):November 1, 1983Publication History Published onli…
Recent applications of PMN-based electrostrictors
Some of device applications of the Pb(Mg1/3Nb2/3)O3-based electrostrictors are reviewed, including displacement transducers for controlling optical pathlength (sensitive AC interferometer, bistable optical device and deformable mirror), and mechanical position actuators (micro-angle adjusting device and servovalve fla…
Interpenetrating polymer networks from triglyceride oils containing special functional groups: A brief review1
Abstract Although most triglyceride oils contain only double bond functionality, a few oils such as castor oil, vernonia oil, lesquerella oil, etc., contain other functional groups. These functional groups include hydroxy and epoxy groups, permitting the easy formation of polyesters and/or polyurethanes. In addition t…
Redox chemistry of metalloporphyrins in aqueous solution
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox chemistry of metalloporphyrins in aqueous solutionA. Harriman, M. C. Richoux, and P. NetaCite this: J. Phys. Chem. 1983, 87, 24, 4957–4965Publication Date (Print):November 1, 1983Publication History Published online1 May 2002Published inissue 1 November 1983https://doi…
Reaction Sequence in the Formation of Lead Zirconate‐Lead Titanate Solid Solution: Role of Raw Materials
The reaction sequence in the formation of Pb(Zr 0.6 Ti 0.4 )O 3 (PZT 60/40) was investigated as a function of PbO and ZrO 2 raw material variations, using powder X‐ray diffraction. Particular emphasis was placed on the final stages of reaction in the formation of PZT solid solution. Based on the present work, a more d…
Electrostriction in PZT-family antiferroelectrics
The elastic strain associated with the field-induced transition from an antiferroelectric phase to a ferroelectric one has been measured at several temperatures in a PZT-family ceramic Pb0·99Nb0·02 [(Zr0·6Sn0·4)0·94Ti0·06]0·98 O3. Reproducible large strain change of about Δℓ/ℓ∼ due to the forced transition may be prom…
Intramolecular photochemical electron transfer. 2. Fluorescence studies of linked porphyrin-quinone compounds
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular photochemical electron transfer. 2. Fluorescence studies of linked porphyrin-quinone compoundsAleksander Siemiarczuk, Alan R. McIntosh, Te Fu Ho, Martin J. Stillman, Kenneth J. Roach, Alan C. Weedon, James R. Bolton, and John S. ConnollyCite this: J. Am. Chem.…
Dry Etching of Polyimide in O 2 ‐ CF 4 and O 2 ‐ SF 6 Plasmas
The plasma etching of the type H Kapton polyimide film has been studied in a parallel plate reactor with two different gas mixtures; and . High etching rate (0.5–3 μm/min) has been obtained in both cases. At a pressure of 0.2 Torr an anomalous loading effect is observed which is attributed to the nitrogen released by…
A Modified Indentation Toughness Technique
A modified indentation technique for measuring toughness is described. The method retains the elastic/plastic basis of previous contact fracture descriptions but eliminates explicit reference to residual stress parameters in the toughness formulation. Accordingly, improved correlations between indentation data and “co…
Quantitative Analysis by Auger Electron Spectroscopy
A short review is presented of the theoretical background of a physical model for the quantification of Auger electron spectroscopy (AES) for surface analysis. The recent studies on the data-base for the inelastic mean free paths (IMFP) by Seah and Dench and systematic calculations of the backscattering factors ( R )…
The phase transition in sodium azide
Sodium azide undergoes a transition from a high-temperature rhombohedral phase to a low-temperature monoclinic phase at 292.2 K. Results of x-ray diffraction studies of the low-temperature phase are reported which indicate that the transition is of the elastic type with the order parameter corresponding to a linear co…
Isothermal degradation of cis‐1,4‐polyisoprene vulcanizates
Abstract The isothermal degradation of high cis ‐1,4‐polyisoprene vulcanizates having different crosslinking structures was investigated by a measurement of weight loss of sample, IR and NMR, gel permeation chromatography (GPC), and gas chromatography (GC). The degradation behavior of dicumy peroxide‐cured sample is s…
Optical Behaviour of Mixtures of Nematic and Cholesteric Compounds
Studies have been carried out on the characteristic optical textures exhibited by mixtures of nematic and cholesteric compounds, namely, N-(P-propoxybenzylidene)p-pentylaniline (PBPA) and cholesteryl ethyl carbonate (CEC). Many of the textures are metastable and undergo a slow transformation at room temperature in the…
The deterioration of gold alloys and some aspects of their conservation
The different ways in which gold alloys can deteriorate are described. The principal alloys discussed are gold-copper, gold-silver and gold-copper-silver. Examples of South American gold alloys from Colombia and Panama are used to illustrate the different types of corrosive attack. Some problems related to the conserv…
A New Postirradiation Mechanical Behavior Test—The Miniaturized Disk Bend Test
A Miniaturized Disk Bend Test (MDBT) capable of extracting postirradiation mechanical behavior information from disk-shaped specimens no larger than those used for transmission electron microscopy has been successfully developed. Finite element analysis is performed to convert the experimentally measured data into use…