Materials Literature
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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…
A vacancy relaxation model which predicts the DC lifetime, pulse DC lifetime, and AC lifetime for all waveforms and all frequencies above 10 kHz is proposed. The AC lifetimes of aluminum interconnect are experimentally found to be more than 10/sup 3/ times larger than DC lifetime at the same current density. AC stress…
A large number of herbal drugs are used in the traditional medicine of Saudi Arabia for the treatment of rheumatism, arthritis, gout and other forms of inflammation. In the present study seven of these crude drugs, namely Francoeuria crispa, Hammada elegans, Malus pumila, Ruta chalepensis, Smilax sarsaparilla, Achille…
A chemical examination of the leaves of Mallotus repandus (WILLD.) MUELLER-ARG. (Euphorbiaceae) has led to the isolation of four new hydrolyzable tannins, named repandusinin (10), repandusinic acids A (11a) and B (14a) (as monopotassium salts) and mallotinin (15), together with glucogallin (1), eugeniin (2), corilagin…
Plasmids containing (dG)27.(dC)27 inserts (pPG27), (dG)37.(dC)37 inserts (pPG37), and (dG)24C(dG)21.(dC)24G(dC)21 inserts (pPG46C) were constructed for the study of structural transitions within (dG)n.(dC)n stretches. Two-dimensional gel electrophoresis has shown that a Mg2+-dependent supercoiling-induced structural t…
Abstract Gelatinization temperatures of starch and hydroxyethyl starch was determined using Differential Scanning Calorimetry (DSC), hot stage microscopy and viscography. The gelatinization temperature based on peak temperature of DSC is incorrect. Viscograph overestimates the gelatinization temperature. Hot stage mic…
The effects of hydride morphology on the axial fracture toughness of cold-worked Zr-2.5Nb pressure tube material have been determined between room temperature and 240°C. Tests were performed on small compact tension specimens machined from samples of material prepared with different morphologies and hydrogen concentra…
Abstract A concept of effective surface area was defined as a geometrical controlling factor for a chemical reaction involving powdery materials. It is not uniquely determined for the specific material but depends on the sort of chemical reaction as well as the state of agglomeration. Case studies were given for disso…
Reaction of europium(III) with p-t-butylcalix[4]arene (H4L) under the same conditions as used for reactions with larger calixarenes yields a yellow crystalline complex structurally characterised as [Eu2(HL)2(dmf)4].7dmf, where dmf =N,N-dimethylformamide. The crystals are monoclinic, space group C2/c with a= 35.03(2),…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUltrasonic irradiation of copper powderKenneth S. Suslick, Dominick J. Casadonte, and Stephen J. DoktyczCite this: Chem. Mater. 1989, 1, 1, 6–8Publication Date (Print):January 1, 1989Publication History Published online1 May 2002Published inissue 1 January 1989https://pubs.a…
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