Materials Literature
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In order to clarify the transport mechanism in fully protanated highly conductive polyaniline the origin and size of the electronic localization centers and barriers have to be determined. Dispersions of polyaniline in an insulating polymer have been studied by temperature-dependent broadband dielectric spectroscopy (…
Work functions and photothreshold values of various layered metal dichalcogenides ( ZrSe 2 , HfSe 2 , NbSe 2 , 1T-TaS 2 , 2H-TaS 2 , MoS 2 , MoSe 2 , α-MoTe 2 , SnS 2 , SnSe 2 ) have been measured by a photoemission technique. The measured photothreshold values, except for Sn compounds, are compared with the calculate…
An improved method is described for the sol–gel preparation of PLZT thin layers in the perovskite structure. The method uses a PbO cover coat. Details are reported for the sol‐gel processing route and heat‐treatment conditions. Through use of this method it is possible to prepare singlephase perovskite material with i…
Abstract Copolymers of L ‐lactide with D ‐lactide According to IUPAC the name dilactide is preferred to lactide. , glycolide IUPAC name: diglycolide. , ε‐caprolactone and trimethylene carbonate, and networks with spiro‐bis‐dimethylene‐carbonate (2,4,7,9‐tetraoxaspiro[5.5]undecane‐3,8‐dione) were prepared in bulk at st…
Cotton, linen, ramie, and viscose rayon fabrics along with a cotton / linen blend were hydrolyzed with cellulase from Trichoderma viride. Surface fibrils were eliminated by a 6 hour treatment in all cases. The loss of fibrillar matter appeared to be the primary cause of weight loss at this stage. On prolonged treatmen…
The validity of various homogeneous layer models for high-spatial-frequency rectangular-groove (binary) dielectric surface-relief gratings is examined for both nonconical and conical diffraction. In each model the grating is described by a slab of uniaxial material with its optic axis parallel to the grating vector. T…
The microstructure and preferred orientations of rapid thermally annealed Pb(Zr 0.53 ,Ti 0.47 )O 3 films, deposited on Pt/Ti/SiO 2 /Si electrode/substrates by solution‐gel spinning, have been investigated using analytical and high‐resolution electron microscopy and X‐ray diffraction. The temperature of pyrolysis of th…
Abstract Phase separation and gelation behaviors have been studied for the acid-catalyzed, alkoxide-based silica systems containing poly(ethylene oxide) (PEO) with an average molecular weight of 100000. Gels with micrometer range interconnected porous morphology were obtained similarly to the systems containing other…
Abstract A new approach for developing fundamental equations of oxygen permeation through thin mixed‐conducting oxide ceramic is presented considering both surface reactions on membrane‐gas interfaces and the diffusion of charged species in the bulk oxide. The essence of this work is the coupling of surface reactions…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrigin of Polychromism of Cis Square-Planar Platinum(II) Complexes: Comparison of Two Forms of [Pt(2,2'-bpy)(Cl2]R. H. Herber, M. Croft, M. J. Coyer, B. Bilash, and A. SahinerCite this: Inorg. Chem. 1994, 33, 11, 2422–2426Publication Date (Print):May 1, 1994Publication Histo…
The dielectric properties of 〈100〉-oriented epitaxial ${\mathrm{SrTiO}}_{3}$ films as used in high-${\mathit{T}}_{\mathit{c}}$ heterostructures have been studied as a function of temperature and applied electric field by using in situ grown heterostructures (Mg/${\mathrm{SrTiO}}_{3}$/${\mathrm{SrTiO}}_{3}$:Nb and Au/$…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTToward Ligand-Driven Light-Induced Spin Changing. Influence of the Configuration of 4 Styrylpyridine (stpy) on the Magnetic Properties of FeII(stpy)4(NCS)2 Complexes. Crystal Structures of the Spin-Crossover Species Fe(trans-stpy)4(NCS)2 and of the High-Spin Species Fe(cis-s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRegiochemistry and Conformation of Poly(3-hexylthiophene) via the Synthesis and the Spectroscopic Characterization of the Model Configurational TriadsGiovanna Barbarella, Alessandro Bongini, and Massimo ZambianchiCite this: Macromolecules 1994, 27, 11, 3039–3045Publication D…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTropylium Ion Formation from Toluene: Solution of an Old Problem in Organic Mass SpectrometryChava LifshitzCite this: Acc. Chem. Res. 1994, 27, 5, 138–144Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 May 1994https://pub…
Abstract Pure polycrystalline Al (99.998%) was oxidized in dry oxygen and water. The surface products formed were analysed by ESCA. The thicknesses of the amorphous Al 2 O 3 formed during oxidation for 1 h in dry oxygen at 25°C and 250°C are 14 and 20 Å, respectively. During exposure of the oxidized sample to water a…
The safety and magnetic resonance (MR) imaging potential of BMS 180549, a new superparamagnetic iron oxide contrast agent, were evaluated in a phase I, open-label, placebo-controlled study involving 41 healthy subjects. No clinically significant postdose changes in physical examination findings, vital signs, or electr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox Processes on Pure Ceria and on Rh/CeO2 Catalyst Monitored by X-Ray Absorption (Fast Acquisition Mode)J. El Fallah, S. Boujana, H. Dexpert, A. Kiennemann, J. Majerus, O. Touret, F. Villain, and F. Le NormandCite this: J. Phys. Chem. 1994, 98, 21, 5522–5533Publication Da…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSupramolecular Organization of Imidazolyl-Porphyrin to a Slipped Cofacial DimerYoshiaki Kobuke and Hidekazu MiyajiCite this: J. Am. Chem. Soc. 1994, 116, 9, 4111–4112Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 May 199…
Abstract The α‐relaxations in homogeneous polymer blends are often compared with the corresponding relaxations in their pure components, an effect that has long been associated qualitatively with concentration fluctuations. A novel “fluctuation model” describes very accurately the observed dielectric relaxation curves…
We have performed a thermodynamical analysis of the phase diagrams for ${\mathrm{ZrO}}_{2}$-CaO and ${\mathrm{ZrO}}_{2}$-MgO solid solutions which has demonstrated that differential heats of mixing are important parameters determining the stabilization of the cubic phase of ${\mathrm{ZrO}}_{2}$ by impurities. It is sh…