Materials Literature
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Grain boundary fracture in molybdenum was investigated by the four-point bending test at 77 K as a function of misorientation angle, by using bicrystals with various 〈110〉 twist boundaries. Main results obtained are as follows:(1) Fracture always occurs at the grain boundary. (2) The fracture strength and strain to fr…
Abstract CsTe 4 entsteht aus Gemengen von Caesium und Tellur im Molverhältnis 1:4, wenn man diese in abgeschlossenen Ampullen einer Schmelzreaktion bei 570°C unterwirft. Die Elementgemenge stellt man der, indem man CsN 3 und Te (1:4) zusammengibt und anschließend durch kontrollierte Zersetzung des Azids den Stickstoff…
The influence of calcination temperature on alumina and on alumina-supported nickel has been systematically studied. Identification of the nickel species has been made using the techniques of X-ray photoelectron spectroscopy (X.p.s.) and X-ray diffraction (X.r.d.). Hydrogen and oxygen adsorption measurements were used…
Attaching a second metalloporphyrin to a zinc(II) porphyrin via a short flexible chain results in quenching of both excited singlet and triplet states of the ZnII porphyrin. The extent of quenching depends markedly upon the nature of the central metal ion contained within the second porphyrin ring (MnIII≈ FeIII > CuII…
Electrochemically doped poly(N-vinylcarbazole) functions as a positive electrode material for a secondary lithium battery.
In the newly synthesized compound MORA12 [S-4-0-(6 methyl)octylresorcylidene-4'-dodecylaniline], we observed a novel intermediate phase (which we call ${P}^{\mathrm{*}}$) between two tilted smectic liquid-crystal phases, ${C}^{\mathrm{*}}$ and X. The ${C}^{\mathrm{*}}$ phase has a helicoidal structure whereas the X ph…
The relative influence of water–surface and water–cation interactions in hydrates of the charge-deficient expanding-lattice layer silicates montmorillonite and vermiculite have been studied using high-resolution quasi-elastic neutron-scattering (QENS) measurements made with the back-scattering spectrometer at ILL, Gre…
A new electromechanical effect has been found in planar oriented S* C liquid crystals under the influence of an applied alternating electric field. Apart from the well-known electrooptical effects a mechanical vibration has been observed in a direction parallel to the smectic layers and perpendicular to the electric f…
X-ray crystaIlography provides us with the most accurate picture we can get of atomic and molecular structures in crystals. It provides a hard bedrock of structural results in chemistry and in mineral
Abstract Melt crystallization of organic substances and its large scale application . In the separation and purification of organic substances, water‐ and solvent free melt crystallization is gaining importance as an independent thermal unit operation. This contribution reviews the physico‐chemical fundamentals, the v…
P. M. A. Sherwood, Chem. Soc. Rev., 1985, 14, 1 DOI: 10.1039/CS9851400001
Abstract Gliding motility was investigated in the marine diatom, Amphora coffeaeformis. Ultrastructural, biochemical, and pharmacological protocols were employed to probe the possible involvement of cytoskeletal proteins and a secretory process in gliding motility. Motility rate was measured using a video recording ap…
We present the first examples of lyotropic discotic nematic and columnar (hexagonal) mesophases obtained by dissolution of non-ionic, disk-like amphiphilic mesogens (hexa-polyethyleneoxy derivatives of triphenylene) in water. The phenomenon of « solvent driven aggregation » is shown to be a practicable route to new an…
Abstract Both tensile and impact properties were measured of a heterogeneous polymer blend system, consisting of nylon 6 and a chemically modified polyolefin, DuPont CXA3095, which is an ethylene‐based multifunctional polymer. It was found, from the tensile testing, that the blends exhibited no signs of necking, and t…
Controlled reduction of LaBO3(B = Co or Ni) perovskites gives rise to ordered structures of composition La2B2O5, belonging to the homologous series LanBnO3n–1, which retain the original features of the perovskite; the co-ordination of the transition metal ions differ, with Ni2+ ions showing octahedral and square-plana…
1985 . 146, . 3 *) (. 4 ), .
The number and type of hydroxy groups on a TiO2 surface can be determined using a combination of wet chemical techniques, F– exchange, OH– and Fe(acac)3(Hacac = pentane-2,4-dione) adsorption, and i.r. spectroscopy.
The crystal and molecular structure and magnetic behaviour of [{Cu(NCO)(OCH2CH2NEt2)}4](B) from benzene have been determined. The crystal structure determination was carried out by single-crystal X-ray diffraction methods and refined to R= 0.066 for 4 379 independent reflections: triclinic, space group P, with unit-ce…
Experimental evidence for a Blue Phase of hexagonal symmetry is reported. In agreement with a theoretical prediction by Hornreich et al., this new Blue Phase has been found in a short pitch cholesteric liquid crystal of positive dielectric anisotropy submitted to a large enough electric field. Its symmetry, compatible…
Lactic acid was polymerized using tetraphenyl tin as a catalyst. The molecular weight of the resultant poly(lactic acid) varied between 0.89 X 10(6) and 2.94 X 10(6) depending upon the concentration of the catalyst used. In-vivo degradation of the poly(lactic acid) samples having 4 different molecular weights were stu…