Photoelectron spectroscopic studies of electrode and related surfaces
P. M. A. Sherwood, Chem. Soc. Rev., 1985, 14, 1 DOI: 10.1039/CS9851400001
Materials Literature
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An investigation of the involvement of cytoskeletal structures and secretion in gliding motility of the marine diatom, Amphora coffeaeformis
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…
New mesophases formed by water soluble discoidal amphiphiles
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…
Mechanical properties of blends of nylon 6 with a chemically modified polyolefin
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…
Oxygen vacancy ordering in superlatives of the two novel oxides, La2Ni2O5 and La2Co2O5, prepared by low temperature reduction of the parent perovskites
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…
The blue phase of liquid crystals
1985 . 146, . 3 *) (. 4 ), .
A method for the quantitative determination of the basic, acidic, and total surface hydroxy content of TiO2
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.
Magnetic behaviour of tetrakis[(2-diethylaminoethanolato)isocyanatocopper(II)], a complex with an antiferromagnetic ground state; the crystal and molecular structure of the triclinic modification
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 hexagonal Blue Phase
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…
In-Vivo Degradation of Poly(Lactic Acid) of Different Molecular Weights
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…
SURFACE TENSION EFFECTS IN THE SEDIMENTATION OF POLYMER PARTICLES IN VARIOUS LIQUID MIXTURES
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…
Reaction‐Rate‐Limiting Steps in Carbothermal Reduction Processes
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…
Grain Boundary Fracture in Molybdenum Bicrystals with Various ⟨110⟩ Symmetric Tilt Boundaries
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…
X-Ray Studies on the Mesogen 4′-n-Pentyloxy-4-Biphenylcarbonitrile(5OCB) in the Solid Crystalline State
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…
Microparticulate feeds for marine suspension-feeders
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…
Linear flexo-electro-optic effect in a hybrid aligned nematic liquid crystal cell
A hybrid aligned nematic liquid crystal sample presents a bulk flexo-electric polarization P. The coupling of P with an external electric field normal to the bounding plates allows, for weak anchoring, a texture distortion. We report a new linear flexo-electro-optic effect in such a cell with a weak anchoring, which p…
Steady state hydrogen transport in solids
The analytical formalism for evaluating the steady state hydrogen (tritium) inventory, recycle and permeation rate and recycle time for surfaces exposed to the plasma of an operating magnetic confinement fusion reactor is reviewed and new material relevant to the application of this theory is presented. The formalism…
Emission characteristics of the ZrO/W thermal field electron source
The ZrO/W thermal field emitter (TFE) has proven to be a useful high brightness electron source for a variety of microprobe applications. Desirable source characteristics are: 1 to 2 mA/sr angular intensity, 1 to 1.5 eV energy spread for an emitter radius of 0.6 to 1 μm, and <0.5% noise level between 1 Hz and 2…
Preparation, Magnetism, and Crystal Structures of the Tautomers [LCu(μ2‐OH)2CuL](ClO4)2 (Blue) and [LCu(μ2‐OH2)(μ2‐O)CuL](ClOμ4)μ2 (Green): μ‐Aqua‐μ‐oxo vs. Di‐μ‐hydroxo Linkage
The first example for μ-aqua-μ-oxo bridging of two transition-metal centers is the cation of 2. This compound is formed as green crystals from CuCl2·2H2O and L in methanol after addition of aqueous NaClO4 solution. 2 is ferromagnetic. 1, the cation of which belongs to a frequently encountered type, is formed as blue c…
Back to the problem of the upper critical fields in organic superconductors
It is shown that the properties of the upper critical fields in organic superconductors can be understood in terms of pure type II superconductivity. The experimental observation of high critical fields violating Clogston's criterion could give support in favour of triplet-paired superconductivity.