Materials Literature
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Bond-orientational order in materials that form three-dimensional uniaxial solids is investigated. New phases are found that scatter light strongly, like nematics, but with a quantitatively different anisotropy of scattering. X-ray scattering from these phases would also exhibit novel anisotropy. This type of order ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSmog chamber studies of nitrogen oxide (NOx) transformation rate and nitrate precursor relationshipsChester W. SpicerCite this: Environ. Sci. Technol. 1983, 17, 2, 112–120Publication Date (Print):February 1, 1983Publication History Published online1 May 2002Published inissue…
An improved cube method was developed for the computation of X-ray scattering curves of macromolecules in solution. For double-helical DNA and RNA molecules the efficiency of this method is shown. The results are compared with curves calculated by effective atomic scattering factor methods. In the small-angle and in t…
In vitro corrosion of Cu-rich amalgams resulted in selective attack of the η' phase. Copper was removed, and SnO 2 products were found in pores and along matrix grain boundaries. The corrosion process greatly accelerated the γ 1 →β 1 transformation.
Abstract Saponite crystallizes from amorphous gel having an ideal saponite composition within 7 days at all experimental temperatures between 300° and 550°C at 1 kbar pressure. Reactions subsequent to this initial crystallization vary in type and degree, depending on the temperature of reaction and the type of interla…
Single-crystal X-ray analysis (R 1 = 0.030, R 2 = 0.031) in space group Cc. On a statistical basis, the M(1) site (mean M(1)-O = 2.14Aa) contains 0.55 Li and 0.45 vacancy, whereas the M(2) and M(3) sites (mean M(2)-O, = 1.902,M(3)-O = 1.903Aa) are fully occupied by Al. In the tetrahedral sites, the ordering of Al,Be r…
In connection with recently published work on the ternary system Ni–Al–Ta two binary alloys were produced for investigation. A Ni–31 at.-%Al alloy was prepared in order to assess the accuracy of the microprobe analysis technique by analysing an alloy heat treated to produce a single phase structure and comparing this…
A consistent quantum-mechanical description is given of some atomistic properties of hydrogen isotopes in bcc metals, including in particular the energy and wave functions of a hydrogen atom, its preference of the type of interstitial sites, distortion of the surrounding lattice, and its effects on crystal structure.…
A method for making low-voltage ZnO varistors having extraordinarily large grain size without necessity of sintering at much higher temperatures or for much longer times is reported. The device is made by sintering a mixture of ZnO fine powder, additives, and ZnO seed grains having grain sizes of 63–105 μm obtained by…
Abstract A previous paper described an unusual crystallinity effect observed in ultrahigh molecular weight linear polyethylene (UHMW PE) and conventional high density polyethylene (HDPE). It was discovered that upon exposure to high energy radiation, these polymers experience a significant increase in the degree of cr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer-supported membranes. A new approach for modifying polymer surfacesSteven L. Regen, Piotr Kirszensztejn, and Alok SinghCite this: Macromolecules 1983, 16, 2, 335–338Publication Date (Print):February 1, 1983Publication History Published online1 May 2002Published inissu…
Internal defects and twin structures exist in thermally transformed monoclinic ( m )‐ZrO 2 particles confined in a mullite matrix. The defects were analyzed by transmission electron microscopy. Twin boundaries on (100), (110), (001), and (011) were found. Frequently, (100) and (110) twins formed complicated mosaiclike…
Abstract In einer Reihe von Polyestern aus Diolen und aromatischen Dicarbonsäuren wurden die cyclischen Oligomeren isoliert und mit Hilfe der Hochdruckflüssigkeitschromatographie quantitativ bestimmt. Der Gehalt an cyclischen Oligomeren hängt von der chemischen Struktur der Polyester und vom Kondensationsverfahren ab.…
We have investigated the phase diagram of the orgainic charge-transfer salt ditetramethyltetraselenafulvalenium fluorosulfenate [${(\mathrm{TMTSF})}_{2}$FS${\mathrm{O}}_{3}$] which contains an asymmetric dipolar anion. At low pressures there is a metal-insulator transition related to anion ordering. Between 5 and 6 kb…
Abstract An experimental apparatus was developed to study trapping and mobilization of oil drops in a capillary of square cross section [100 microns × 100 microns (100 µm × 100 µm)] having a constriction also approximately square in shape. The throat of the constriction had dimensions of about 10 microns (10 µm) on a…
One hundred and one clones from 25 North American and 7 European populations of Asterionella formosa Hass. were isolated or obtained from other investigators. Twenty populations were represented by two or more isolates obtained either simultaneously or at different times of the year.Soluble proteins, present in crude…
Abstract XPS imaging promises to be a powerful analytic tool because it enables specific information on both elements and bonding to be recorded on a two‐dimensional distribution map. As far as the authors are aware, the only scanning XPS method to date which has been found to be practical is essentially a scanned‐par…
Abstract Polypropylene, polystyrene, EP (ethylene/propylene) rubber, and bromobutyl rubber were blended under standardized conditions and the sizes of minor phase domains determined by Quantimet analysis. Dispersion effectiveness was found to depend on the melt viscosities of components under mixing conditions and on…
A standard cleaning procedure for GaAs (100) molecular beam epitaxial (MBE) substrates is a chemical treatment with a solution of H2SO4/H2O2/H2O, followed by in situ heating prior to MBE growth. X-ray photoelectron spectroscopic (XPS) studies of the surface following the chemical treatment show that the oxidized As is…
A simple method for determining the third-order nonlinear optical susceptibility of solutions by optical third harmonic generation (THG) is presented. The method utilizes the weak absorption of light by most liquids at the 1.91 μm wavelength of the fundamental employed in this work. This property simplifies the comple…