Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
A detailed procedure leading to the evaluation of the explicit anharmonic contributions to the phonon frequency shift and the linewidth to the lowest order is described for a molecular crystal. An application is then made to obtain numerical results for phonon frequency shifts and the linewidths in deuterated naphthal…
Elastomer-modified epoxy resins have grown in usage in the past 15 years in several application areas connected with structural adhesives, composites, civil engineering/construction, electrical laminates/encapsulants and corrosion resistance. Some of this increased attention has come about through utility of telecheli…
Novel elastomeric polysiloxane modifiers for epoxy networks have been synthesized and characterized. In addition, curing studies of conventional epoxy resins incorporating these oligomers have been conducted. Structures were prepared having either epoxide, primary amine and/or secondary amine endgroups. The polymeriza…
A correlated study of the structural, optical, magnetic, and transport properties of polyacetylene, doped with iodine to nearly the metallic doping levels, shows that essentially all charges go into solitonlike states. The measurements are in quantitative agreement with charge transport via variable-range hopping amon…
Abstract The nature of the liquid crystal phases formed by different compounds and the thermal and other physical characteristics of these phases are strongly affected by the stereochemistry and structure of the molecules. Precise structure-property correlations of an embracing nature cannot yet be quantified, but eve…
Abstract Liquid crystals of disc-like molecules fall into two distinct structural types, the columnar and the nematic. The columnar phase in its simplest form consists of discs stacked aperiodically in columns, the different columns constituting a two-dimensional array, whereas the nematic phase is an orientationally…
Abstract A saturated triblock copolymer, poly(styrene‐block‐ethylene‐co‐butylene‐block‐styrene) was chemically crosslinked using trimethylol propane trimethacrylate, TMPTM, and subjected to electron beam radiation. The gel percent, Gehman ten second modulus, and stress relaxation were measured to characterize the mate…
The ν3 band of UF6 isolated in solid xenon is shown to consist of a single sharp spectral feature.
Abstract In Anlagen der Nachrichtentechnik und Elektronik treten Überspannungen auf, die zur Vermeidung von Personen‐ und Sachschäden auf ungefährliche Werte begrenzt werden müssen. Bauelemente zur Spannungsbegrenzung sind Edelgasüberspannungsableiter, die in der Regel mit radioaktiven Materialien präpariert sind. Dur…
The oxidation-reduction properties and the phase relations of mixed oxides in the system La-U-O were examined by means of thermogravimetry and X-ray diffraction method. The O/M ratios of the mixed oxides LayU1-y O2±x, prepared at 1,650°C in vacuo by the reaction of La2O3 and UO2, were expressed as 2–0.5 y except 0.2≤y…
Abstract We have measured the thermal conductivity, λ, of n‐undecane, using the transient hot‐wire technique. At low pressures, n‐undecane has a plastic crystal phase α H . The increase in λ, going from the liquid to phase α H , was 35%. For a liquid → plastic crystal transition, this is a high value. It reflects that…
Abstract The effective Debye temperature θ eff for directions normal to the (110) Ni face and with an angle of about 54° to the normal is measured by LEED for different azimuths, for electron energies of 70 to 100 and 130 to 160 eV, respectively, and for the incidence angle of a primary beam of about 60°. Under such c…
Abstract Na 2 HPO 4 kristallisiert monoklin in der Raumgruppe P2 1 /mC mit: a = 545,1(1); b = 684,7(2); c = 547,3(1) pm; β = 116,34(1)°; Z = 2. Die Struktur läßt sich von einer angenähert hexagonal dichten Anionenpackung ableiten, mit Na + in den Oktaeder‐ bzw. der Hälfte der Tetraederlücken. Es liegt Fehlordnung im…
This article deals with the determination of mechanical response of a nonlinear viscoelastic solid based on a Frechet expansion. A modified superposition principle suggested earlier by various authors is used to simplify the constitutive equation. It is then shown that the resulting stress‐strain equations are consist…
The influence of the bias electric field E2 on anomalies of the elastic stiffness coefficient C22 and dielectric permetivity ε2 in crystals of CsH2PO4 have been studied. Strong influence of E2 on the value and shape of anomalies of C22 has been found. Below the phase transition temperature ε2 ε(Tc-T-γ with γ = 3 at th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeterogeneous reactions of aluminum and copper surfaces with stearic acidRobert A. Ross and Aniko TakacsCite this: Ind. Eng. Chem. Prod. Res. Dev. 1983, 22, 2, 280–286Publication Date (Print):June 1, 1983Publication History Published online1 May 2002Published inissue 1 June…
A Lifson-Warshel force field of the type recently used by the authors to study defect structures in silicon has now been developed for diamond. The parameters of this field are determined mostly by least-squares fitting of the phonon dispersion curves, but some experimental values must also be used. The crucial term i…
Abstract Unit-cell parameters of synthesized members of the crandallite ( a = 7.007 Å, c = 16.216 Å)-goyazite ( a = 7.013 Å, c = 16.650 Å) series vary linearly with composition between end-members. Most members of the series consist of 0.1 μ m platy crystals, but crandallite also contains some larger (1–5 µ m) tapered…
Abstract A series of screening tests have been performed to determine the chemical types needed for chelating iron (Fe+++) at concentrations as high as 50,000 ppm in spent acid. The chemicals tested were liquid citric acid (LCA), nitrilotriacetate (NTA) and acetic acid (AA). A blend of liquid citric acid and nitrilotr…
We present the optical properties of poly (2,2' bithiophene) and show that this material exhibits electrochromic behavior.