Materials Literature
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Complex alkali-borosilicate glasses are being studied, and used, as media for radioactive waste encapsulation. The effects of radiation from α-decay processes on the physical properties of such glasses is of interest. The energy deposited in the glass by such decay processes can be simulated by ion implantation. We ha…
A review of previously published hypotheses concerning phylogenetic relationships in the diatom family Achnanthaceae is presented. Data for characters such as valve ultrastructure, chloroplast number and morphology, and sexual reproduction for the genera Cocconeis, Achnanthes and Rhoicosphenia and their purported bira…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of hydrophobic particles on the foaming of aqueous surfactant solutionsMichael P. AronsonCite this: Langmuir 1986, 2, 5, 653–659Publication Date (Print):September 1, 1986Publication History Published online1 May 2002Published inissue 1 September 1986https://pubs.ac…
Abstract Kinetics of K + adsorption were investigated on kaolinite, a Chester loam soil and vermiculite using static, stirred, and vortex batch techniques. The objective of this study was to elucidate the rate‐limiting steps for K + adsorption on the clay minerals and soil. We hypothesized that it is possible under la…
Abstract Expressive memory effect has been proven in the course of the annealing of the β‐modification of polypropylene (β‐PP). The character of the structural changes taking place in β‐PP during annealing strongly depends on the thermal history. In dependence on the thermal history βα or ββ‐recrystallization takes pl…
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…