Materials Literature
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We report X-ray diffraction, density, ultrasonic velocity and refractive index studies in the N(p-n-pentyloxy benzylidene) p-n-alkylaniline compounds, viz. 50.5, 50.6 and 50.7. The nematic-smectic A (NA) transition is found to be weak first order in 50.6 while it is second order in 50.5 and 50.7. The salient features…
The least-squares method incorporating orthonormal relation between wavefunctions is formulated. The method fulfils the idempotency condition and allows the representation of wavefunctions to be obtained from charge-density distributions measured by the X-ray diffraction method. The present method can be applied to bo…
In order to determine the empty cell gap of a liquid-crystal (LC) cell to better than 1% accuracy, the empty LC cell has been modeled as an optical medium consisting of seven layers with an air gap representing the true cell gap in the middle layer. The given index of refraction and thickness for each layer, optical r…
The sensitivity and selectivity of double modulation Fourier transform infrared reflection absorption spectroscopy for absorbing species on a reflecting surface has been employed for the in situ analysis of low-temperature plasma enhanced chemical vapor deposition formed SiO2 films deposited on HgCdTe, silicon, and al…
A Therasonic 1030 (Electro-Medical Supplies) therapeutic ultrasound generator operating at 1 MHz continuous wave was used to insonate aerated water at two temperatures, 22 degrees C and 37 degrees C. Using various acoustically reflecting materials, sound fields were set up with different standing wave components. Meas…
Energies of formation of the members of the homologous series SrO · nSrTiO 3 , through a Ruddlesden‐Popper type of superlattice ordering, have been examined by employing atomistic computer simulation techniques. Results of the calculations have been shown to provide a theoretical basis for the observation that a limit…
The first-order Raman spectra of ZnWO4 single crystals have been obtained. All the vibrational frequencies are assigned by group theory. Among them the Bg modes at 269, 166, and 147 cm−1 and Ag mode at 124 cm−1 are reported for the first time. In view of x-ray structure data of ZnWO4, we suggest that the frequencies o…
Abstract— Two easily prepared derivatives of chlorophyll,purpurin–18 and chlorin p 6 , are potent sensitizers of cell killing by low‐intensity red light. The internal anhydride group inpurpurin–18 provides the potential of covalently linking in one step the chlorin to cell targeting agents such as antibodies.
The reflectivity of a multilayer dielectric coating deposited upon the end facet of a symmetrical dielectric slab waveguide is investigated for both TE and TM waves. The integral equation satisfied by the field in the junction plane is solved numerically through a Fourier representation and an iteration process. The p…
Abstract The α relaxation of isotropic and drawn poly(vinyl alcohol) dried gel films was studied using dynamic mechanical analysis. The temperature of the relaxation T α increased from 160°C in the isotropic gel to 220°C in a fiber drawn 19 ×. The relaxation, which is associated with the crystalline regions of the mat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDipalladium complexes with N,N'-diphenylbenzamidine bridging and chelating ligands. Synthesis and structural and electrochemical studiesC. L. Yao, L. P. He, J. D. Korp, and J. L. BearCite this: Inorg. Chem. 1988, 27, 24, 4389–4395Publication Date (Print):November 1, 1988Publ…
The relative effect of 13 anionic species, in conjunction with hydrogen and sodium cations, on the stress corrosion cracking (SCC) behavior of lightly sensitized AISI(1) 304 stainless steel (SS) was investigated in constant extension rate tests (CERTs) at 289 C in water with 0.2 ppm dissolved oxygen at total conductiv…
Abstract Donor‐ und Acceptorsubstituenten stabilisieren cyclische (4n)π‐Elektronensysteme und destabilisieren solche mit (4n + 2)π‐Elektronen. Entsprechendes gilt für Übergangszustände von pericyclischen Reaktionen, und das erklärt das Auftreten von dipolaren Zwischenstufen bei symmetrieerlaubten Cycloadditionen und s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteraction of the carbon-germanium or carbon-tin bond with positive charge on a .beta. carbonJoseph B. Lambert, Gen Tai Wang, and Douglas H. TeramuraCite this: J. Org. Chem. 1988, 53, 23, 5422–5428Publication Date (Print):November 1, 1988Publication History Published online…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactivity of the oxo-bridged ion .mu.-oxobis[bis(2,2'-bipyridine)dioxodiruthenium](3+)Stephen J. Raven and Thomas J. MeyerCite this: Inorg. Chem. 1988, 27, 24, 4478–4483Publication Date (Print):November 1, 1988Publication History Published online1 May 2002Published inissue…
The cross-linking reaction of 15 dimethacrylates, one trimethacrylate and five diacrylates was studied by means of differential scanning calorimetry (DSC) and high performance liquid chromatography (HPLC) to investigate the relationship between the polymerization characteristics and the chemical structure of these mon…
Hexagonal colloidal copper particles with a narrow size distribution are formed in the reduction of an acetonitrile solution of Cu(OAc) 2 ·H 2 O with hydrazine hydrate in the presence of poly(vinyl‐2‐pyrrolidone). The deep‐red sols, which were characterized by electron microscopy, are extremely stable in an inert gas…
Magnetic susceptibility has been measured in ${\mathrm{Pb}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Mn}}_{\mathrm{x}}$Te, ${\mathrm{Pb}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Mn}}_{\mathrm{x}}$Se, and ${\mathrm{Pb}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Gd}}_{\mathrm{x}}$Te with values of x fr…
Powder diffraction techniques are potentially extremely useful for the characterization of a variety of metallic thin films which are used as interconnection materials in very large scale integrated (VLSI) devices. Phase identification, texture determination, elastic strain measurement, and grain size distribution can…
Submicrometer alumina powders, of both standard and narrow particle‐size distributions, were consolidated by dry‐pressing and colloidal‐forming techniques. The resulting green compacts were characterized in terms of pore‐size distribution, green density, shrinkage behavior, and sintered density. The interrelationships…