Materials Literature
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It is shown that three Frank elastic constants K 1 , K 2 and K 3 of a nematic liquid crystal can be determined by measuring the capacitance change with a magnetic field of a homogeneously aligned cell. The splay elastic constant K 1 is determined from the threshold magnetic field strength H c1 when the magnetic field…
Summary New oil-gelling agents have been developed composed of a long-chain dialkyl phosphate (DP) surfactant and aluminium ion or multinuclear aluminum ion (MAI) which provide good oil-gel systems. One such gelling agent is the aluminum salt of DP (DP-Al) prepared as a precipitate by mixing DP with aluminum chloride…
A new ternary intermetallic compound, Ta 5 Ga 2 Sn, has been synthesized by the self-flux method using molten tin as a solvent. The crystal structure is tetragonal (space group D 4h 18 /I4 mcm). The lattice parameters are a =10.342(2) Å, c =5.174(2) Å, V =555.3 Å 3 , Z =4, and the X-ray density D x is 13.91 Mgm -3 at…
Abstract A first-order phase transition accompanied by a color change from green to black was observed for CsSnI3 at about 425 K. These two modifications showed quite different 127I NQR spectra suggesting drastic structural change. High temperature modification has a perovskite structure with semi-metallic electric co…
Communication: Organic Polyelectrolytes (I–VII) known as Ionenes, with unique combinations of high refractive index (ND) and high Abbe number (VD, see figure) now compete with inorganic glasses for application in optics. Variation of the counterions allows the tuning of their chemical and optical properties.
Abstract The aging of tracers, containing different amounts of Mg, Sr(NO 3 ) 2 , KClO 4 , Al‐Mg alloy and organic binder, was conducted under the conditions of 50.0% and 98.5% relative humidities at 75 °C, and of 98.5% relative humidity at 25 °C. IR spectroscopy and X‐ray diffraction were used for investigation of che…
The properties of intrinsic optical bistability in nematic liquid crystals were studied. This kind of optical bistability is without resonant optical cavity and electric feedback. We find that the nematic ROTN-200 film can exhibit bistability when applying a constant ac electric field (≊560 kHz) that is greater than a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDevelopment of new adhesion agents for asphalt cementCarlo Giavarini and Gilberto RinaldiCite this: Ind. Eng. Chem. Res. 1989, 28, 8, 1231–1236Publication Date (Print):August 1, 1989Publication History Published online1 May 2002Published inissue 1 August 1989https://pubs.acs…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
Abstract Exchgangeable Cl− anions in the interlayer sites of a hydrotalcite-like mineral, Mg6Al2(OH)16Cl2·4H2O, catalyzed a halide-exchange reaction between C6H5CH2Cl and C4H9Br or C4H9I in toluene or in DMF. Thus, for example, a reaction between C6H5CH2Cl (33 mmol) and C4H9Br (195 mmol) in DMF at 343 K for 20 h gave…
The strengths of as‐drawn, abraded, and pristine Se, As 2 Se 3 , As 2 S 3 , and Ge 30 As 15 Se 55 fibers are reported. Pristine strength values range from an average of 80 MPa for Se and Ge 30 As 15 Se 55 to 100 and 180 MPa for As 2 Se 3 and As 2 S 3 , respectively. Although these values are considerably higher than t…
The available data on the effects of fast neutron irradiation on the properties of fine-grain (POCO) graphites at temperatures between 950 and 1400°C are collected. New results are presented for a number of fine-grain graphites irradiated at 600°C. The results are discussed in terms of the useful lifetimes of the grap…
Article Structural and chemical varieties of dioptase, Cu6[Si6O18]∙6H2O was published on August 1, 1989 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 187, issue 1-4).
Abstract This paper is concerned with the study of the positive photosensitive polyimide precursors, and deals with monomer synthesis, polymerization, and characterization. The polymers were prepared from diamines and diaeid chlorides whieh were derived from the reactant with biphenyltetracarboxilic dianhydride and o‐…
Abstract A series of novel ABA block copolymers were synthesized containing a rigid‐rod (B) block for reinforcement and a flexible coil (A) block as the matrix. Poly[(benzo[1, 2d: 4, 5d′]bisthiazole‐2,6‐diyl)‐1,4‐phenylene] (PBT) was the rigid‐rod (B) block utilized in this study and was polymerized in such a way as t…
The present study was undertaken to determine if uses of exogenous electrical fields could improve the posttraumatic quality of dermis and epidermis in isolated grafts in the rat. In blinded procedures, a full-thickness area of skin was removed and reattached to the original site. A galvanic device delivering 4.5 micr…
Mechanical and dielectric strength distributions were studied for variously surface‐finished TiO 2 ceramics. Roughly finished specimens showed a small Weibull modulus for both kinds of failures, and clear analogies between mechanical and dielectric strength distributions were found in both rough‐and fine‐surface speci…
Voids frequently form on crystallization of calcium phosphate glasses because of the density difference between the original glass and the resulting glass‐ceramic. However, the calcium phosphate glass‐ceramic with a composition of 40CaO · 50P 2 O 5 · 10Al 2 O 3 (mol%) has a density nearly equal to that of the original…
Abstract Hochlegierte austenitische Stähle mit 6 bis 7% Molybdän, 20 bis 21% Chrom und 18 bis 25% Nickel finden zunehmend Anwendung im Seewasser‐ und Chemiebereich, vor allem infolge ihrer Beständigkeit gegenüber Loch‐ und Spaltkorrosion in chloridhaltigen neutralen und sauren Medien. Die hohen Chrom‐ und Molybdängeha…
The effect of surface plasmon generation on the reflectivity of thin metal films in attenuated-total-reflection prism configurations has been described as a means of determining the film dielectric function and thickness. Although this technique is capable of yielding accurate values for the film parameters with relat…