Materials Literature
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We report the development of a methodology for the comprehensive characterization of the linear- and nonlinear-optical properties of a model copolymer, Disperse Red 1, covalently functionalized to a methyl methacrylate backbone. From refractive-index and electro-optic measurements, we have evaluated both fundamental m…
The basic mechanisms determining the formation of optical anisotropy in stretched, thin polymer dispersed liquid crystal (PDLC) films with micron sized nematic droplets have been studied experimentally and the results analysed in terms of a proposed theoretical model. The experiments were performed on PDLC films with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and characterization of polyurethanes based on a series of fluorinated diolsRobert V. Honeychuck, Tai Ho, Kenneth J. Wynne, and Robin A. NissanCite this: Chem. Mater. 1993, 5, 9, 1299–1306Publication Date (Print):September 1, 1993Publication History Published onl…
We have previously shown that the concentration of Gd-DTPA as a function of time ([Gd-DTPA]t(t)) in the myocardium following an intravenous bolus injection of Gd-DTPA can be modeled using the Modified Kety Equation. Fitting this model to measurements of [Gd-DTPA]t(t) in a region of myocardium would allow the determina…
Abstract New aromatic diamines having kink and crank structures, 2,2′‐bis( p ‐aminophenoxy)biphenyl and 2,2′‐bis( p ‐aminophenoxy)‐1,1′‐binaphthyl, were synthesized by the reaction of p ‐fluoronitrobenzene with biphenyl‐2,2′‐diol and 2,2′‐dihydroxy‐1,1′‐binaphthyl, respectively, followed by catalytic reduction. Biphen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation, characterization, and reactivity of scandium octaethylporphyrin complexes. X-ray crystal structures of (OEP)ScCH3, (OEP)ScCH(SiMe3)2, (OEP)Sc(.eta.5-C9H7), and [(OEP)Sc]2(.mu.-OH)2John Arnold, Caroline G. Hoffman, Denisha Y. Dawson, and Frederick J. HollanderCit…
Ferroelectric lead-zirconate-titanate (PZT) thin films were successfully fabricated by the multi-ion-beam sputtering technique in an oxygen ambient at a low substrate temperature of 415°C. By inserting lead-lanthanum-titanate (PLT) buffer layers between substrates and PZT films, the perovskite-PZT thin films could be…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStabilization of the dipole alignment of poled nonlinear optical polymers by ultrastructure synthesisChengzeng Xu, Bo Wu, Olga Todorova, Larry R. Dalton, Yongqiang Shi, Peter M. Ranon, and William H. SteierCite this: Macromolecules 1993, 26, 20, 5303–5309Publication Date (Pr…
Abstract A new, generalized, method for measuring the steric size of ligands and substituents has been developed. The method is based on the solid angle concept, the solid angle being generated by the pairwise addition of spheres (atoms). The problem of overlapping spheres (atoms) has been solved analytically and the…
A simple criterion as a first approximation to predict the formation of elementary colloids of implants in SiO 2 glasses by ion implantation has been proposed. The criterion predicts that colloid formation occurs when free energy of formation of oxides of implants is greater than that of SiO 2 at ∼3000 K, which corres…
Studies of imprint properties have been carried out by electrical evaluation with pulse switching response and circuit modeling on sol-gel lead zirconate titanate (PZT) ferroelectric thin-film capacitors. The imprint properties were evaluated by measuring the switched and nonswitched charges after three different oper…
Durch quantitative Cyanethylierung von Polyaminen kombiniert mit katalytischer Hydrierung der gebildeten Polynitrile sind Poly(trimethylenimin)‐Kaskadenmoleküle in hohen Ausbeuten und hohen Reinheiten zugänglich. Ausgehend von Ammoniak wurden mit dieser Reaktionssequenz hochsymmetrische Dendrimere bis zur fünften Gene…
(Ba 0.5 Sr 0.5 )TiO 3 thin films (200-300 nm) were deposited on Pt-coated Si substrates by laser ablation at 500 and 650°C. The leakage currents of crystalline films grown at 650°C were found to be higher than those of amorphous films grown at 500°C. The crystalline thin films showed higher surface roughness than the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA two-dimensional polymer formed by TCNE and dirhodium tetra(trifluoroacetate)F. Albert Cotton and Youngmee KimCite this: J. Am. Chem. Soc. 1993, 115, 18, 8511–8512Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Published inissue 1 Sep…
Stoichiometric Bi 4 Ti 3 O 12 thin films were prepared by sol-gel processing. This paper discusses the synthesis of polymerizable solutions containing Bi and Ti, and characterization of the resulting Bi 4 Ti 3 O 12 thin films. The formation of metallic alkoxide and acetate alkoxide are indispensable, soluble precursor…
The dielectric constant and leakage current were studied for SrTiO 3 films thinner than 100 nm, focusing on the influence of the dielectric-electrode interface and the grain boundary. Experimentally, the thickness dependence of the dielectric constant and leakage current was investigated for both epitaxially grown fil…
A neutron-diffraction measurement in the 0--23 A${\mathrm{\r{}}}^{\mathrm{\ensuremath{-}}1}$ inverse space interval was performed on pure amorphous Si. With the structure factor obtained experimentally three-dimensional models were constructed by reverse Monte Carlo simulation for the determination of the atomic struc…
Based on the results of total-energy calculations using the full-potential linear muffin-tin orbital method, the equilibrium ground-state structure is determined in perovskite-type ${\mathrm{KNbO}}_{3}$ and ${\mathrm{KTaO}}_{3}$ complex oxides. The first compound is found to have a ferroelectric zero-temperature groun…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplementarity and internal consistency between magnetic and optical properties for the manganese(II) copper(II) heterodinuclear compound [Mn(Me6-[14]ane-N4)Cu(oxpn)](CF3SO3)2 (Me6-[14]ane-N4 = (.+-.)-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane; oxpn = N,N'-…
Pb(Zr, Ti)O 3 thin films of thickness ranging from 55 nm to 625 nm were synthesized on Pt/Ti/SiO 2 /Si substrates using a sol-gel process. The film thickness dependence of both microstructure and electrical properties was investigated. The synthesized films showed columnar structure. The diameter of each column was ar…