Materials Literature
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The irreversible photobleaching of amorphous Ge30S70 films is found to depend on the air pressure during exposure. This is most probably a result of photo-oxidation and/or hydrolysis of the layers. The appearance of a Ge-O-Ge vibrational band in the infrared transmission spectra of exposed layers clearly indicates the…
Movement in a centric diatom, Actinocyclus subtilis, is reported here for the first time. The movement is directional and strong circumstantial evidence from histochemistry and electron microscopy supports the proposal that motility is achieved by the production of mucopolysaccharides through the labiate processes.
This letter reports the first measurements of differential cross-sections (DCS) for one- and two-electron capture by highly charged ions at low keV energies. These measurements have been achieved using a new type of spectrometer with a design based on a two-dimensional position-sensitive detector. A comparison of the…
Abstract The dilation of low‐density polyethylene accompanied by the sorption of CO 2 was measured by microscopy under pressures up to 50 atm at temperatures from 25 to 55°C. The dilatometry measurement, which is also applied to the determination of the thermal expansion coefficient, is directly performed by a catheto…
Abstract The effect of structure, composition, and cure on the water absorption and T g of amine‐cured epoxies was investigated. Water absorption is considered to depend on the polar group concentration and type, and on the amount of free volume in the polymer network. The contribution of polar groups in terms of thei…
Determination of metal particle size of highly dispersed Rh, Ir, and Pt catalysts by hydrogen chemisorption and EXAFS
The structure of [Eu(NO3)2(18-6)]3[Eu(NO3)6] has been probed by high-resolution excitation and emission spectra at 77 and 4.2 K. The compound contains centrosymmetric [Eu(NO3)6]3− ions with D2h, C2h, or Ci symmetry and three types of complex [Eu(NO3)2(18-6)]+ cations with D2 symmetry slightly distorted towards C2v. Th…
Block copolymers constructed from chains of poly(2-hydroxyethyl methacrylate) (PHEMA) and either poly-ethyleneoxide (PEO) or poly-propyleneoxide (PPO) were synthesized. These block copolymers exhibited microdomain structure. Platelet adhesion on their surfaces was investigated by a column elution method to examine the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFour compounds containing oxo-centered trivanadium cores surrounded by six .mu.,.eta.2-carboxylato groupsF. Albert Cotton, Michael W. Extine, Larry R. Falvello, Diane Beck Lewis, Gregg E. Lewis, Carlos A. Murillo, Willi Schwotzer, Milagros Tomas, and Jan M. TroupCite this: I…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNitric oxide reduction by carbon monoxide over noble-metal catalysts under cycled feedstreamsHideaki Muraki and Yoshiyasu FujitaniCite this: Ind. Eng. Chem. Prod. Res. Dev. 1986, 25, 3, 414–419Publication Date (Print):September 1, 1986Publication History Published online1 Ma…
Abstract The origins of multiple peaks observed by differential scanning calorimetry have been examined in detail for a linear polyethylene fraction crystallized from dilute solution and for bulk‐crystallized copolymers of ethylene. At least two major bases are demonstrated. One is melting–recrystallization; the other…
The magnetostrictive properties of cubic Laves phase Tb0.27Dy0.73Fe2prepared by (a) Czochralski and (b) a free standing r.f. zone method, were examined. Crystals were found to grow preferentially along [11\bar{2}] in twinned dendrite sheets with [111] normal. The saturation magnetostriction along [111] is very large (…
Novel polyetherurethaneureas containing tertiary amino groups in the side chains (PAEUU) were synthesized, quaternized with different alkyl halides (Q-PAEUU), and heparinized (H-PAEUU). The antithrombogenicity of PAEUU in vitro was improved by quaternization, and further by heparinization. The excellent antithrombogen…
Small anomalies have been found in the thermal behavior of synthetic ikermanite: (l) a sharp anomaly in the heat capacity at 357.9 K, and (2) a discontinuity in the thermal expansion at 693 K as determined by X-ray diffraction. The enthalpy and entropy assigned to the heat<apacity anomaly, for the purpose of tabulatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic activity and structure of molybdenum trioxide highly dispersed on silicaTakehiko Ono, Masakazu Anpo, and Yutaka KubokawaCite this: J. Phys. Chem. 1986, 90, 20, 4780–4784Publication Date (Print):September 1, 1986Publication History Published online1 May 2002Publishe…
Kinetics of BaTiO 3 and PbTiO 3 formation from metalloorganic precursors were studied. The fine grain size of the decomposed product and the greater degree of mixing led to very rapid kinetics of compound formation. The kinetics data were fitted to the Carter model for a diffusion‐controlled process. Formation of PbTi…
Preliminary experiments have been performed to probe the feasibility of using plasma enhanced chemical vapor deposition (PE–CVD) to prepare electrochromic thin films of tungsten oxide and molybdenum oxide by plasma reaction of WF6, W(CO)6, and Mo(CO)6 with oxygen. Thin films produced in a 300 W, electrodeless, radio-f…
A design method for a low aberration matrix lens is developed. The matrix lens consists of an electrostatic lens array and beam limiting aperture array located outside of the lens array. It is shown that off-axial aberrations, which are dominant in the outer lenses, can be reduced by shifting the aperture from the opt…
The interface problem of light reflection and refraction through a thin dielectric slab is formulated as a pure BVP for the e.m. field in the slab. The resulting difference equation is solved and interference effects for quarter-wave films are discussed.
The activities of MoO 2 in the (Ti,Mo)O 2 solid solution were measured at seven different compositions, using an emf method involving calcia‐stabilized zircoinih as solid electrolyte. In the temperature range studied, 1350 to 1600 K, the activities of MoO 2 show a strong positive deviation from ideal behavior. In addi…