Materials Literature
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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…
The sedimentation volume, V sed of polymer particles in mixtures of pairs of nonpoiar as well as polar liquid combinations was determined at 20°C The liquid combinations were chosen such that the interfacial tension, γSV, of the polymer particles fell between the surface tensions of the two liquids. Constant: amounts…
The production of β‐sialon (Si3A1303N5) and nonoxidic powders by carbothermal reduction of oxides is discussed. Special attention is paid to the rate‐determining steps in the conversion process performed in a packed‐bed reactor. It is shown that powders with specific surface area >10 m 2 /g can be produced by the c…
In order to investigate the grain boundary fracture in molybdenum with 〈110〉 symmetric tilt boundaries, the four-point bending test was conducted at 77 K by using bicrystals with various misorientations from 0° to 90°. A stress-strain curve to fracture was measured as a function of misorientation angle φ. Two classes…
The crystal and molecular structure of nematogen 4′-n-Pentyloxy-4-Biphenylcarbonitrile has been determined by direct methods. The crystals belong to the monoclinic system with space group P21/n. a = 21.378(5), b = 5.695(3), c = 12.789(2) Å, β = 106.074(17)° with four molecules per unit cell. Least-squares refinement l…
The development of microparticulate food particles for marine suspension-feeders is discussed with respect to the difficulties of nutrient delivery in the aquatic environment and to feeding and digestion in crustacea and bivalve molluscs. Loss of nutrients from particles suspended in seawater must be minimized by eith…