Materials Literature
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The relationship between the molecular weight of liquid hydroxyl-terminated polybutadiene (HTPB) and the physical properties of the elastomers were investigated. HTPB having various molecular weights were cured with 4,4′-diphenylmethane diisocyanate (MDI) by the one-shot method and the physical properties of these ela…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSonoluminescence of aqueous solutionsC. Sehgal, R. P. Steer, R. G. Sutherland, and R. E. VerrallCite this: J. Phys. Chem. 1977, 81, 26, 2618–2620Publication Date (Print):December 1, 1977Publication History Published online1 May 2002Published inissue 1 December 1977https://pu…
ABSTRACT A study of attached diatom communities on artificial and natural substrates was conducted in Wheelwright Pond, New Hampshire, during 1975. There were differences in the species composition growing on artificial glass slides and natural substrates. The slides favored the accumulation of Achnanthes minutissima…
This investigation is concerned with voltage stabilizing effects of peroxide decomposition products, measured by electrical treeing resistance. Trees are filled with a liquid, consisting of decomposition products. These details and the relationship to the treeing phenomenon are described and explained. The treeing res…
Some recent results of the research aimed to correlate properties of filled silicone rubber compounds with surface properties of fumed silica fillers are reported. It is shown that the specific interaction between silica surface silanol groups and the siloxane chain of silicone rubber plays the main role in “crepe har…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsomerization of the alkyl group in (.eta.5-C5H5)Fe(CO)(PPh3)(alkyl) complexesD. L. Reger and E. C. CulbertsonCite this: Inorg. Chem. 1977, 16, 12, 3104–3107Publication Date (Print):December 1, 1977Publication History Published online1 May 2002Published inissue 1 December 19…
Blisters have been observed in the oxide film of aluminum in aqueous chloride solutions. They can be initiated by short duration (⪝ 1 msec), low voltage pulses. Such blisters grow only if the steady‐state potential of the specimen is above the pitting potential. The growth proceeds laterally along the oxide‐metal inte…
Abstract The indirect exchange in heavily doped europium chalcogenides is calculated in the mean field approximation. The finite width of the conduction band and carrier statistics (splitting of spin subbands, non‐thermal degeneracy) are taken into account. The model is applied to Gd‐doped EuO and EuS for which magnet…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and magnetic properties of [M(C5H5NO)6]L2 (M = copper, zinc; L = perchlorate(1-), tetrafluoroborate(1-))C. J. O'Conner, E. Sinn, and R. L. CarlinCite this: Inorg. Chem. 1977, 16, 12, 3314–3320Publication Date (Print):December 1, 1977Publication History Published o…
An appropriate uncertainty measure for a compact Lie group is the invariant dispersion ( Delta F) 2 =(g rs (F r -(F r ))(F s -(F s ))). It is proven that it is minimized for maximum weight vectors (of greatest length in the weight space), and those unitarily related to them.
Abstract Effects of particle size, crystallinity and the amount of the structural water in kaolinites on their infrared spectra, were studied. The samples were ground in a vibrating ball-mill, and infrared and X-ray spectra, as well as thermal and specific surface area measurements, were taken on the initial and groun…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural characterization of [AsPh4]+[Fe4(NO)7(.mu.3-S)3]-. Stereochemical and bonding relationship of the Roussin black monoanion with the red ethyl ester, Fe2(NO)4(.mu.2-SC2H5)2, and Fe4(NO)4(.mu.3-S)4Cynthia Ting-Wah. Chu and Lawrence F. DahlCite this: Inorg. Chem. 1977…
Equimolar mixtures of binary or ternary combinations of tanthanides were studied with several photolytic sources. The solutions were photolyzed until more than 90% of Eu3+ was reduced. This is the first such study reported.(AIP)
The special features of X-ray energy-dispersive powder and single-crystal diffraction using synchrotron radiation are discussed on the basis of experiments performed at the Deutsches Elektronen-Synchrotron, DESY. The method is shown to be of particular value for fast structure identifications, experiments for which la…
The technique of molecular dynamics is used to calculate the properties of a liquid phase in contact with a fcc crystal phase. A system of 1680 particles which interact through a Lennard-Jones potential is divided into two closed subsystems by imposing artificial boundaries across which the particles can interact, but…
The infrared and Raman spectra of TTF and TTF- d 4 as powder and solution samples are reported. An extensive assignment of the fundamental vibrational modes is presented and discussed in terms of a normal coordinate analysis of the inplane modes. The results obtained allow the calculation of the cartesian displacement…
By controlled crystallization of the ferroelectric crystalline phase of Pb5Ge3O11 from the glass of the same composition, the evolution of ferroelectric behavior has been studied as a function of grain size. The large-grained material (≳1 μm) exhibits normal ferroelectric behavior. However, during the initial growth o…
Abstract The hydrolysis of aluminum-tri-(sec-butoxide), ASB, in ionic and nonionic media is shown to be a useful method for the synthesis of aluminum minerals. Infrared and X-ray analysis were used to identify the reaction products. Pseudoboehmite is formed at low water to aluminum ratios. At higher water content, tra…
Abstract The carotenoids astaxanthin, lutein and zeaxanthin form high molecular weight aggregates in aqueous solvent systems. The absorption spectra of the aggregates, compared to those of the monomer molecules, show significant bandwidth narrowing and blue shifts of 600–800 Å. The resonance Raman spectra of these agg…
The ultraviolet absorption cross sections of HgI2, HgBr2, and tin (II) halide vapors in the region 200–400 nm have been measured. The cross sections for the tin (II) halides are higher than the mercury (II) halides. The various ground and excited state HgX, SnX radicals, and X atoms (X=I, Br, Cl) produced as a result…