Materials Literature
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Seven novel fungitoxic sesquiterpenoids, chokols A, B, C, D, E, F and G, were isolated from stromata of Epichloe typhina on Phleum pratense. Their structures were determined by spectroscopic methods. The absolute configuration of chokol E was elucidated by its CD spectrum with Eu(fod)3 and a chemical correlation with…
Quality, appearance, and tactile properties of textiles arise from the choices of fibre type, linear density, staple length and degree of crimp, yarn linear density, mass, and twist, and fabric mass, weave type, density, and type of finishing, and especially the types of fibre assembly chosen. Information on how these…
Abstract Graft polymerization of maize starch with acrylic acid using potassium persulphate as free radical initiator was investigated under different conditions. Variables studied included initiator concentration, acrylic acid concentration, starch/water ratio and polymerization temperature. The carboxyl content of t…
Our recent studies of ferroelectric chiral smectic and super-twisted nematic (ST) multiplexed-matrix liquid-crystal displays (LCDs) and a thin-film-transistor (TFT) active-matrix twisted nematic (TN) LCD are presented, mainly in terms of liquid-crystal material and cell optimization. This is based on a consideration o…
ABSTRACT: Analytical transmission electron microscopy (ATEM) was used to obtain chemical analyses of single illite crystals from Upper Carboniferous reservoir sandstones ofthe Bothamsall Oilfield, East Midlands, UK, and from Rotliegendes (Permian) sandstones of the North Sea. All samples were found to be highly alumin…
The scheme previously proposed by the authors on the basis of the Taylor model to deal with the deformation of polycrystals caused by the stress induced martensitic transformation (SIM) has been futher extended to describe the recovery stress associated with the reverse transformation upon unloading. According to this…
The unusually highly puckered macrocyclic core of the title compound confirms proposed conformational changes which are essential for the facile aerial oxidation of phenolic porphyrins, such as meso-tetrakis(3,5-di-t-butyl-4-hydroxyphenyl)porphyrin (1).
Irradiation of the benzene solution of l-(2-vinylpheny1)-2-(2-furyllethenes (71 resulted in the formation of furo(3.2-bl-6.7benzobicyclo[3.2.llocta-2,6-dienes (101 as the main product.The structure of the products was determined by spectroscopic data.Intramolecular photochemical cycloadditions of o-divinylbenzene (1)…
Some CaO–SiO2–H2O gels of controlled composition have been synthesised by the hydrolysis of mixed alkoxide precursors and by direct reaction between colloidal SiO2 and Ca(OH)2. The gels were equilibrated with water at 25 °C after different ageing treatments, and the water compositions analysed. A mathematical model de…
Ultrafine particles (UFP) of Fe-Ni, Fe-Cu and Fe-Si alloys were produced by arc melting, vaporization and deposition of iron alloys in 50%H2-50%Ar atmosphere (“hydrogen plasma-metal” reaction) at 0.1 MPa pressure. The morphology, chemical composition and crystal structure of particles obtained were determined by TEM o…
The occurrence of a three dimensional hexagonal blue phase BPH (possible space groups P6222 and P6422) in materials with negative dielectric anisotropy ϵa = ϵ∥ - ϵ⊊ has been detected by the investigation of Kossel diagrams. This is the first observation of a field-induced transition between different blue phase modifi…
The synthesis and single-crystal X-ray structure characterization of tetrameric cubane clusters of copper(1) halides with the hindered N-base ligand 2-(diphenylmethy1)pyridine are reported. The chloride, bromide and iodide structures are isomorphous , crystallizing in the tetragonal space group 141/ a, a ˜ 23, c ˜ 12…
It is shown experimentally that several types of glyceride additives improve the dielectric breakdown strength of polyethylene at the semiconducting electrode. The highest breakdown strength is more than twice the original one in terms of 1% Weibull breakdown strength. The average normal component, cos theta , is intr…
Analytical results are obtained for mobility functions that describe the hydrodynamic interactions for transverse motions of two unequal viscous drops. In conjunction with the results of an earlier paper on axisymmetric motions, the motion induced by external forces in an arbitrary direction, i.e., the solution of the…
The magnetostrictivity (d) and magnetostriction ( lambda ) of high coupling magnetomechanical amorphous ribbons and wires are determined without the use of a direct magnetomechanical measurement. The method relies on an easily measured magnetic property (permeability) of the magnetostrictive material obtained under th…
Environmentally assisted crack growth (namely, stress corrosion cracking and corrosion fatigue) in alloys is one of the principal determining factors for durability and reliability of engineering structures. Over the past 20 years, activities in this area have transformed from screening and qualitative characterizatio…
The dynamics of electric-field-induced lattice distortions and phase transitions in the BPI, BPII and BPIII (fog) phases of blue-phase mixtures, which include low-molar-mass and/or polymeric components, have been studied. Several electric-field-induced effects have been observed in the blue phases, and the electro-opt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh energy resolution x-ray photoelectron spectroscopy studies of tetracyanoquinodimethane charge transfer complexes with copper, nickel, and lithiumJohn M. Lindquist and John C. HemmingerCite this: Chem. Mater. 1989, 1, 1, 72–78Publication Date (Print):January 1, 1989Publi…
Transference numbers determined by the classical Hittorf method for liquid polymer electrolytes (solutions of NaSCN etc. in copolymers of ethylene and propylene oxide) yield consistently low values of t+(ca. 0.05). This points to a model in which cations are immobilised by interaction with the polymeric solvent and an…
Laser Raman microprobe examination in air of small-particle-sized (powders and whiskers) TiN, TiB 2 , TiC, WC, ZrN, and NbN revealed the formation of surface oxides, which were induced by laser heating. The rate of oxide formation varied with the particle size of the samples and the laser power density applied. The ox…