Materials Literature
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Abstract A liquid‐crystalline side‐chain polymer with laterally incorporated naphthalene groups in the mesogenic moiety is investigated in binary mixtures with an optical uniaxial low‐molar‐mass liquid crystal. Mixtures with up to 50 mol‐% content of the monomeric liquid crystal show a biaxial nematic phase. At lower…
Uniaxial tension–compression fatigue behavior of 3‐mol%‐yttria‐stabilized tetragonal zirconia polycrystals was investigated. Hysteresis in the stress–plastic strain curve featured cumulative plastic strain and weakened elastic stiffness. Fracture statistics in terms of cycle‐to‐failure depends strongly on the maximum…
11 B and 27 Al magic angle spinning nuclear magnetic resonance (MAS NMR) spectra of alkaline‐earth boroaluminate glasses show that the structure of these glasses are far more complicated than previously thought. The relative concentrations of 3‐ and 4‐coordinated boron vary as found by previous investigators using con…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface induced crystallization in ultrahigh-modulus polyethylene fiber-reinforced polyethylene compositesHatsuo Ishida and Philippe BussiCite this: Macromolecules 1991, 24, 12, 3569–3577Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Publi…
Amorphous carbon (a-C) thin films have been prepared by r.f. magnetron sputtering of graphite targets in an Ar atmosphere and their d.c. electrical dark conductivity has been measured as a function of temperature. The results are compared with those obtained by earlier workers for a-C and hydrogenated a-C. A detailed…
The reaction of a stoichiometric mixture of aluminum isopropoxide and yttrium acetate in 1,4‐butanediol at 300°C yielded crystalline yttrium aluminum garnet having an approximate particle size of 30 nm. No other phases were detected. The use of ethylene glycol in place of 1,4‐butanediol afforded an amorphous product.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSuperconductivity at 2.8 K and 1.5 kbar in .kappa.-(BEDT-TTF)2Cu2(CN)3: the first organic superconductor containing a polymeric copper cyanide anionUrs Geiser, Hau H. Wang, K. Douglas Carlson, Jack M. Williams, Henry A. Charlier Jr., James E. Heindl, George A. Yaconi, Bradle…
Fairly monodisperse colloidal boehmite fibrils with a high aspect ratio were synthesized by hydrothermal treatment at 150°C of an acidified aqueous alkoxide solution, prepared by adding an aqueous HCl solution to an aluminum alkoxide precursor. The average particle length could be controlled between about 100 and 500…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of some phenolic antioxidantsAnwar A. Hamama and Wassef W. NawarCite this: J. Agric. Food Chem. 1991, 39, 6, 1063–1069Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published inissue 1 June 1991https://pubs.acs.org/do…
Ten dental casting alloys were tested for alloy-element release into cell-culture medium, and this release was related to alloy composition, alloy microstructure, and alloy cytotoxicity (previously determined). Cell-culture medium was analyzed for alloy elements by flame atomic absorption. Concentrations of elements i…
Grain growth in a high‐purity ZnO with systematic additions of Sb 2 O 3 from 0.29 to 2.38 wt% was studied for sintering in air from 1106° to 1400°C. The results are discussed and compared with previous studies of pure ZnO and ZnO with Bi 2 O 3 additions in terms of the kinetic grain growth expression: G n – G n 0 = K…
The sintering of zinc oxide powder compacts has been investigated at constant rates of heating of 0.5° to 15°C/min. For samples with the same initial relative density (0.50), the temperature derivative of the densification strain versus density fits within a single, relatively narrow band. At low temperatures the dens…
Studies with 20 soils containing from 7 to 204 g kg‐1 total carbon and from 0.5 to 16.9 g kg‐1 total nitrogen indicated that the Leco CR‐12 Carbon Determinator and the Leco CHN‐600 Elemental Analyzer are satisfactory for routine analysis of soils for total carbon and that the Leco CHN‐600 Elemental Analyzer is also sa…
Abstract The basal spacing of a set of smectites, with layer charges between 0.74 and 1.14 electrons per unit cell, have been measured while the smectites were in equilibrium with NaCl solutions having concentrations of 0.25 to 2.5 molal. Except for the most highly charged smectites, an expansion from ~15.5 to ~18.5 Å…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of the linear trinuclear complex hexakis(acetato)bis(2,2'-bipyridine)trimanganese (II). Determination of the J electron-exchange parameter through magnetic susceptibility and high-field magnetization measurementsS. Menage, S. E. Vitols, P. Bergerat, E. Codjovi, O.…
Pyroelectric detectors offer major advantages in terms of cost and ease-of-operation over cooled photon detectors of long wavelength infra-red radiation. This paper reviews the requirements of a pyroelectric material to maximise its effectiveness in different types of detector and compares the properties of ferroelect…
Lead zirconate titanate (PZT) thin films with a composition near the morphotropic phase boundary (Zr/Ti = 53/47) were fabricated by spin deposition of an alkoxide‐derived solution and annealed at 650°C for 30 min. A complex microstructure is observed in which micrometer‐scale rosettes of the desired perovskite phase a…
SUMMARY The environmental scanning electron microscope (ESEM) allows the examination of specimens in a gaseous environment. It is based on an integration of efficient differential pumping with a new design of electron optics and detection systems. Backscattered, cathodoluminescence and X‐ray detectors can be designed…
A detailed thermodynamical analysis of commensurate and incommensurate magnetic phases in localized magnetic systems within a mean-field theory is presented. Interesting results are obtained concerning the specific heat of amplitude-modulated magnetic structures: In particular, the specific-heat discontinuity at the o…
Monte Carlo computer simulation has been used to study water confined between the layers of 2:1 clay minerals. The model systems are based on natural Mg and Na smectites. The simulation cells contain one clay layer, 64 water molecules and four magnesium or eight sodium interlayer cations. These atoms and molecules int…