Materials Literature
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The crystal structures of nylon 11 in the form of lamellar single crystal obtained by crystallization from solution was studied and three crystal modifications were found. Lamellar crystals of form I, which were obtained from solution in diols, have a triclinic unit cell and are similar to the α form of nylon 66 and 6…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination chemistry of methylmercury(II). Synthesis, hydrogen-1 NMR, and crystallographic studies of cationic complexes of MeHg(II) with ambidentate and polydentate ligands containing pyridyl and N-substituted imidazolyl donors and involving unusual coordination geometrie…
The polarization characteristics of mild steel were studied under microaerobic conditions in four media, including a synthetic medium and the produced water from an oil field. In all the media, anodic depolarization was always observed when a ferric iron reducing bacterium (Pseudomonas sp.) was present. In produced wa…
A study is presented on sintering of the mixed oxide (CeO 2 ) 0.82 (GdO 1.5 ) 0.18 where the density of the green samples, the density of the sintered samples, and the ionic conductivity of O 2 ‐ ions in the sintered samples were measured. The dependence of these three parameters on the method of preparation of the po…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and x-ray structure of trans-dioxo(1,4,8,11-tetraazacyclotetradecane)technetium(V) perchlorate hydrateS. A. Zuckman, G. M. Freeman, D. E. Troutner, W. A. Volkert, R. A. Holmes, D. G. Van Derveer, and E. Kent BarefieldCite this: Inorg. Chem. 1981, 20, 8, 2386–2389…
Abstract Integrated intensities of the fundamental modes of vibrations of ammonium in heat-treated, NH 4 + -exchanged swelling minerals permits (1) a quantitative determination of the amount of tetrahedral substitutions of Si 4+ by M 3+ in dioctahedral smectites, and (2) an estimate of the degree of interlayer surface…
The acoustic emission power during deformation of pure aluminium single crystals and polycrystals, and specimens of A1 1·3wt% Mg, has been measured. In pure aluminium the acoustic emission activity increased with grain size to approach the levels of activity from single crystals, whereas the emission activity of the A…
The scanning electron microscope (SEM) is an extremely versatile instru ment capable of yielding many different kinds of information from the resulting interaction of the electron beam and the sample. One such interaction produces currents in semiconductors, the topic of interest here. The popular acronym for this su…
Increases in surface reaction rates caused by periodic illumination of iron and nickel passive films with polychromatic and monochromatic light have been measured. The electrode photoresponse is caused by excitation of a surface film which is the product of anodic oxidation. The dependence of the photo‐current magnitu…
Magnetovolume effects in ferromagnetic transition metals and alloys, such as the spontaneous volume magnetostriction, the forced volume magnetostriction, are described by a phenomenological theory based upon a fluctuating local band picture, in which both itinerant electron and local moment characters are taken into a…
Abstract An algorithm for modelling the angular behaviour of the XPS signal corresponding to a postulated depth profile containing concentration gradients is presented.
Additions of 0.1 to 6.0 wt% V 2 O, to lead zirconate titanate (PZT) ceramics promoted rapid densification below 975°C, thereby eliminating the need for PbO atmosphere control The base PZT, Pb(Zr 0.53 Ti 0.47 )O 3 , was prepared by coprecipitation from mixed oxides and butoxides. The V 2 O 5 was incorporated as a batch…
The state of dispersion of poly(ethylene-co-propylene) (PEP) rubber and high-density polyethylene (HDPE) in polypropylene (PP) blends was investigated using scanning electron microscopy to examine solvent-etched microtomed surfaces cut at low temperatures. The validity of the method was established by comparing the ar…
Abstract Packagings for fatty food should protect against light, oxygen, microorganisms, and loss of water vapor and flavor substances. Low off‐taste and adequate mechanical stability is required. Pigmented plastics fulfill most of these requirements. Two main effects caused by the interaction of fatty food components…
Abstract The crystal of the charge-transfer complex of dibenzotetrathiafulvalene-7,7,8,8-tetracyanoquinodimethane, DBTTF–TCNQ, belongs to the triclinic system; a=10.309(8), b=8.281(2), c=7.727(3) Å, α=110.03(4), β=109.80(4), γ=72.05(3)°, space group P\bar1 with Z=1. The structure has been determined by the X-ray metho…
Reflectivity spectrum of single crystal of hexagonal ice is measured at 80 K in the energy range between 6 and 28 eV. Spectra of absorption coefficient, dielectric constants and effective number of optical electrons are determined. Reflectivity spectrum of amorphous ice is measured for a comparison. Electronic states…
The article is divided in two parts. In part I we review the present state of knowledge on the problem of the transition to turbulence in isotropic liquids and we discuss analogies/differences with the case of nematics. In the well known Rayleigh-Bénard case, experiments on ordinary liquids show that one must distingu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of IR extinction coefficients for linear- and bridged-bonded carbon monoxide on supported palladiumM. A. Vannice and S. Y. WangCite this: J. Phys. Chem. 1981, 85, 17, 2543–2546Publication Date (Print):August 1, 1981Publication History Published online1 May 2002…
Raman spectra were measured on B 2 O 3 ‐SiO 2 glasses heat‐treated at different temperatures and for different periods of time. It was found that the intensity ratio of the 810‐ and 475‐cm −1 bands depended on the thermal history and composition of glass. The intensity vs heat‐treatment temperature curve exhibited a m…
Cultivated cells form a valuable model system for studies on the effects of various preparative protocols for scanning electron microscopy (SEM). The various effects of each preparative step can be followed in detail in the light microscope and no diffusion gradients complicate the fixation and other procedures as in…