Morphological Changes Resulting from the Hydrolytic Degradation of Stereocopolymers Derived from L- and DL-Lactides
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Automatic numerical integration techniques for polyatomic molecules
We describe a new algorithm for the generation of 3D grids for the numerical evaluation of multicenter molecular integrals in density functional theory. First, we use the nuclear weight functions method of Becke [A. D. Becke, J. Chem. Phys. 88, 2547 (1988)] to decompose a multicenter integral ∫F(r) dr into a sum of at…
Fully protonated polyaniline: Hopping transport on a mesoscopic scale
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 Function and Photothreshold of Layered Metal Dichalcogenides
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…
Lead Oxide Coatings on Sol–Gel‐Derived Lead Lanthanum Zirconium Titanate Thin Layers for Enhanced Crystallization into the Perovskite Structure
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…
(Co)polymers of L‐lactide, 1. Synthesis, thermal properties and hydrolytic degradation
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…
Enzymatic Hydrolysis of Cotton, Linen, Ramie, and Viscose Rayon Fabrics
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…
Homogeneous layer models for high-spatial-frequency dielectric surface-relief gratings: conical diffraction and antireflection designs
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…
Use of Transmission Electron Microscopy for the Characterization of Rapid Thermally Annealed, Solution‐Gel, Lead Zirconate Titanate Films
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…
Phase Separation in Silica Sol–Gel System Containing Poly(ethylene oxide). I. Phase Relation and Gel Morphology
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…
Oxygen permeation through thin mixed‐conducting solid oxide membranes
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…
Origin of Polychromism of Cis Square-Planar Platinum(II) Complexes: Comparison of Two Forms of [Pt(2,2'-bpy)(Cl2]
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…
Dielectric properties of sputteredSrTiO3films
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/$…
Toward 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-stpy)4(NCS)2
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…
Regiochemistry and Conformation of Poly(3-hexylthiophene) via the Synthesis and the Spectroscopic Characterization of the Model Configurational Triads
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…
Tropylium Ion Formation from Toluene: Solution of an Old Problem in Organic Mass Spectrometry
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…
Surface analysis of oxidized aluminium. 1. Hydration of Al 2 O 3 and decomposition of Al(OH) 3 in a vacuum as studied by ESCA
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…
Phase I clinical evaluation of a new iron oxide MR contrast agent
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…
Redox Processes on Pure Ceria and on Rh/CeO2 Catalyst Monitored by X-Ray Absorption (Fast Acquisition Mode)
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…
Supramolecular Organization of Imidazolyl-Porphyrin to a Slipped Cofacial Dimer
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…