Materials Literature
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Using nanosecond laser pulses, we have observed for the first time optically induced transient and (erasable) permanent gratings in a smectic-A film. The transient grating is accompanied by strong high frequency acoustic waves.
Abstract Poly(vinyl chloride) (PVC) and its blends with polybutadiene‐acrylonitrile (NBR) (containing 21.7 weight‐percent acrylonitrile (AN), a heterogeneous two‐phase system; and containing 41.6 weight‐percent of AN, a homogeneous one‐phase system) and with polyethylene‐vinyl acetate (EVA) (containing 45 weight‐perce…
Abstract Contact angle and surface tension were measured for distilled and hard water solutions of adjuvants, Ortho X‐77, Span‐20, Sterox‐NJ. Surfactant‐WK, Triton B‐1956, Triton X‐114, Tween‐20, and Sun Oil 11E. The same parameters were measured for suspensions of atrazine [2‐chloro‐4‐(ethylamino)‐6‐(isopropylamino)‐…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray diffraction and nuclear magnetic resonance studies of the relationship between electronic structure and the tetragonal distortion in zirconium hydride (ZrHx)Joseph S. Cantrell, R. C. Jr. Bowman, and D. B. SullengerCite this: J. Phys. Chem. 1984, 88, 5, 918–923Publicati…
Crystal structures of Ca 2 Sr(C 2 H 5 CO 2 ) 6 at sixteen temperatures between -160°C and 150°C have been determined accurately, using an X-ray four circle diffractometer. The occupancies of the three disordered methyl groups in a formula unit, together with the displacements of Sr, Ca and O atoms, vary with temperatu…
Abstract Tetrahedral framework compounds, as defined in this paper, generally exist as tilted and distorted versions of ideal fully expanded structures at room temperature and atmospheric pressure. How pressure, temperature, and composition ( P, T , and X ) affect the tilting and distortion is critically reviewed. It…
When (CH)X is p-doped (oxidized) or n-doped (reduced) chemically or electrochemically the “dopant” ion may or may not be derived from the oxidizing or reducing agent as dictated by the nature of the specific doping reaction involved. The reduction potentials of neutral (CH)X and its various oxidized or reduced states…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of bis(.mu.-bromo)bis(N,N,N',N'-tetraethylethylenediamine)dicopper(I) and the kinetics of its oxidation by dioxygen in nitrobenzeneMelvyn Rowen Churchill, Geoffrey Davies, Mohamed A. El-Sayed, Jay A. Fournier, John P. Hutchinson, and Jon A. Zu…
Differential thermal analysis (DTA) has been used to obtain the temperature rises produced during the setting of a range of tooth coloured restorative materials, which included silicates, glass ionomers and composites. These have been compared on the basis of the temperature rise per unit volume of material. Calibrati…
A collection of photoacoustic spectra of several readily available stoichiometric rare earth oxide powders is presented. J levels of these spectra are assigned. In addition to the traditional applications of photoacoustic spectroscopy (chemical, physical, and analytical investigations), the technique is useful for stu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, crystal and molecular structure, and spectroscopic properties of tris(2,2'-bipyridyl)iron(II) nitroprusside tetrahydrate, [Fe(bpy)3][Fe(CN)5NO].4H2OM. E. Garcia Posse, M. A. Juri, P. J. Aymonino, O. E. Piro, H. A. Negri, and E. E. CastellanoCite this: Inorg. Chem.…
A series of simultaneous interpenetrating polymer networks of polyurethane-poly(methyl methacrylate) were synthesized under high pressure (up to 20,000kg/cm2). The morphology via transmission electron microscopy and the glass transition behavior via DMA and DSC measurements were studied, and the effect of the synthesi…
A generalized hydrodynamic treatment of the dynamic behavior of transverse phenomena in a fluid is presented. An attempt is made to describe such phenomena (VH depolarized light scattering, flow birefringence, transverse sound or shear waves and viscous flow) in a consistent manner over a range of temperatures for whi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMercury-199 NMR study of the mercury cations (Hg2+, Hg22+, Hg32+, and Hg42+): the first example of mercury-mercury spin-spin couplingRonald J. Gillespie, Pierre Granger, Keith R. Morgan, and Gary J. SchrobilgenCite this: Inorg. Chem. 1984, 23, 7, 887–891Publication Date (Pri…
Through the use of modulation spectroscopy we have measured the absorption spectrum experienced by a weak probe beam in the presence of a saturating pump beam at two different wavelengths within the broad homogeneous absorption band of alexandrite. At 584 nm the absorption saturates at high pump intensities, and a hol…
We report a study of the magnetoresistance of the organic superconductor bis-tetramethyl-tetraselenafulvalenium perchlorate [${(\mathrm{TMTSF})}_{2}$Cl${\mathrm{O}}_{4}$] from 1.8 to 20 K in fields up to 79 kG, for current flow both parallel and perpendicular (${\stackrel{\ensuremath{\rightarrow}}{\mathrm{c}}}^{*}$) t…
Abstract The microstructure of polybutadiene produced by anionic initiation in diethyl ether and tetrahydrofuran with counterions Li + , Na + and K + was determined by 1 H‐ and 13 C‐NMR. Ionization suppressing salts were added in tetrahydrofuran to ensure that only the ion‐pair reaction was studied. Results are compar…
For the past decade, materials research has focused on synthesizing new materials and generating new structural arrangements that exhibit specific desired properties. Some of the greatest advances in this area have come out of work on intercalation compounds, which are formed by the insertion of atomic or molecular la…
A model considering both short-range and long-range interactions for liquid crystals mixtures of rod-like and plate-like molecules is presented in this paper. The model is treated in the framework of a mean field, van der Waals-type theory. The relationship of the model to a Landau-type treatment is discussed in an Ap…
Abstract Addition of cryoground rubber (CGR) causes changes in curing characteristics (decrease in Mooney scorch time, optimum cure time, and reversion time) and shows a detrimental effect on most of the vulcanizate properties (tensile, resilience, flex, hysteresis, set, and abrasion). Tear strength, however, is not a…