Materials Literature
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The initial growth process of diamond thin films formed by dc plasma chemical vapor deposition on cubic boron nitride ( c BN) surfaces of {111} B , {111} N and {100} has been investigated by scanning electron microscopy (SEM) and Auger electron spectroscopy (AES). On the {111} B surface, it is observed that the carbon…
General expressions for the free energy of the nematic liquid crystal in the interfacial region are derived using the density functional approach. The anisotropic part of the surface tension and the coefficients of the Landau–de Gennes theory for the nematic free surface are expressed in terms of the direct correlatio…
The double-well potential model, well known to describe many low-temperature properties of amorphous materials, has been extended to incorporate effects of high pressures. The resulting model not only explains the temperature and time dependences of pressure-induced phenomena but also provides possible explanations fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxo- and hydroxo-bridged (porphyrin)iron(III)-copper(II) species as cytochrome c oxidase models: acid-base interconversions and x-ray structure of the Fe(III)-(O2-)-Cu(II) complexAlaganandan Nanthakumar, Stephen Fox, Narasimha N. Murthy, Kenneth D. Karlin, Natarajan Ravi, Bo…
We generalize a previous model that was proposed to interpret the thickness dependence of the anchoring energy relevant to the nematic-liquid-crystal--solid substrate interaction. We show that beside the dielectric coupling between the surface electric field and the nematic liquid crystal, the quadrupolar flexoelectri…
Abstract A single-crystal X-ray analysis has revealed that the FeII–edta complex, formulated as Na2[Fe(edta)(H2O)]·2NaClO4·6H2O, has a seven-coordinate structure close to a mono-capped trigonal prism (C2v-CTP). The crystal data are as follows: Orthorhombic, Pmnb, a = 11.404(1), b = 23.573(2), c = 9.915(1) Å, and Z = 4…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProcess designs for fractional crystallization from solutionLuis A. Cisternas and Dale F. RuddCite this: Ind. Eng. Chem. Res. 1993, 32, 9, 1993–2005Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Published inissue 1 September 1993https…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSmall-angle scattering investigations of poly(.epsilon.-caprolactone)/polycarbonate blends. 1. Small-angle neutron and x-ray scattering study of crystalline blend morphologyY. W. Cheung, R. S. Stein, G. D. Wignall, and H. E. YangCite this: Macromolecules 1993, 26, 20, 5365–5…
We present a time dependent theoretical approach to calculating the electronic properties of semiconductor nanoclusters. The technique can be applied to ground and excited electronic states without using the effective mass approximation or perturbative expansions. The effects of surface properties on the electronic st…
Using surface optical second-harmonic generation, we have determined the molecular tilt angle and the in-plane orientational order of the liquid-crystal molecules 4'-n-octyl-4-cyanobiphenyl (8CB) on a series of polyimide surfaces. The polyimides differ in the length of the flexible spacers in between neighboring aroma…
One of the key processing concerns in the integration of thin film capacitors into the existing VLSI for ferroelectric or dynamic random access memory applications is the patterning of these films and the electrodes. In this work, we have identified a suitable etch gas for dry etching of PZT thin films on electrodes.…
Abstract Polyaniline (PAN) samples of high intrinsic oxidation states, such as the nigraniline (NA) and pernigraniline (PNA) oxidation states, were prepared by chemical oxidation of the 50% oxidized emeraldine (EM) base and the fully reduced leucoemeraldine (LM) base, according to the methods reported in the recent li…
Deterioration and degradation of organic polymeric structures are the basic mechanisms ensuring recycling of the elements of the biosphere. All organic polymers are, in principle, degradable, but even nature combines inert and degradable components in the same material, as, for example, in wood. Wood consists of degra…
NAD(+)-dependent isocitrate dehydrogenase from Saccharomyces cerevisiae is an allosterically regulated enzyme that exists as an octamer composed of two nonidentical subunits, designated IDH1 and IDH2. To determine the contribution of each subunit to regulation and catalysis, a conserved serine residue at the proposed…
sol with particle diameter of 5 nm was applied to the surface of both chemically and mechanically polished polycrystalline nickel. The oxidation kinetics during early stages of formation have been measured with an ultrahigh vacuum manometric system in the temperature range of 873 to 1073 K and oxygen pressure . The ce…
Göhr-Rosenthal S, Schmitt-Willich H, Ebert W, Conrad J. The demonstration of human tumors on nude mice using gadolinium-labelled monoclonal antibodies for magnetic resonance imaging. Invest Radiol 1993;28:789-795. rational and objectives. The authors describe the magnetic resonance imaging (MRI) of a tumor in a nude m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of Cp*MoCl4 and Cp*WCl4 with H2O, H2S, amines, and hydrazines. Formation of the trioxo anions [Cp*Mo(O)3]- and [Cp*W(O)3]- and the trisulfido anion [Cp*W(S)3]-Melinda S. Rau, Christine M. Kretz, Gregory L. Geoffroy, and Arnold L. RheingoldCite this: Organometallics…
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…