Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAn Approach to Glycerol Dendrimers and Pseudo-Dendritic PolyglycerolsRainer Haag, Alexander Sunder, and Jean-François StumbéView Author Information Freiburger Materialforschungszentrum und Institut für Makromolekulare Chemie, Albert-Ludwigs-Universität, Stefan-Meier-St…
The effect of copolymers on the breakup and coalescence of polybutadiene (PB) drops in polydimethylsiloxane (PDMS) is studied using a four-roll mill flow cell. Copolymers are produced at the interface by a reaction between functionalized homopolymers. They reduce the interfacial tension and thus enhance breakup; they…
Four magnetization models, now considered as classical, are presented: the Stoner-Wolhfarth model, the Jiles-Atherton model, the Globus model, and the Preisach model. The paper describes the methods each model uses to simulate the magnetization mechanisms, reversible and irreversible processes, major and minor loops,…
We studied the femtosecond dynamics of colloidal gold nanorods encapsulated in micelles after excitation with 400 nm pulses of 100 fs duration. It is found that the laser heating of the electron gas of gold nanorods with an average aspect ratio of 3.8 leads to the bleaching of both the transverse and longitudinal mode…
Slow photoconductivity transients were comprehensively studied in ZnO films prepared by spray pyrolysis of the zinc-nitrate solution. Surface charge controlled the film conductivity, and it was possible to reversibly change the conductivity by many orders of magnitude using short-term annealing in hydrogen and oxygen.…
The domain structures and phase transitions of relaxor-based piezo-/ferroelectric (1−x)Pb(Mg1/3Nb2/3)O3−xPbTiO3 [PMNT] single crystals, grown from high temperature solutions, have been analyzed by polarized light microscopy using an optical crystallographic approach. The substitution of Ti4+ ions for the B-site comple…
The controlled deposition of individual V2O5 nanowires on chemically modified SiO2 substrates is reported here. Electrical transport measurements were performed on individual fibers (see Figure) and on thin fiber networks, and the conductivity of an individual V2O5 nanowire was estimated to be ∼0.5 S/cm at room temper…
Cellulose with a degree of polymerization up to 650 can be dissolved in dimethyl sulfoxide containing 10 to 20% (w/v) tetrabutylammonium fluoride trihydrate without any pretreatment within 15 min at room temperature. The new solvent can be classified as a non-derivatizing one as concluded from 13C NMR measurements. Th…
The kinetics and mechanism of l, l -dilactide (LA) polymerization, initiated with tin(II) butoxide (Sn(OBu) 2 ) and carried out in THF solvent (from 20 to 80 °C) or in bulk (at 120 °C), were studied. Polarimetric and size exclusion chromatography (SEC) measurements showed that initiation was fast and quantitative; ter…
Dipolar interaction between the metal ion and proximate water molecules represents an efficient mechanism for solvent relaxation in Gd3+ complexes currently employed as MRI contrast agents. Besides inner sphere (metal bound) and outer sphere hydration molecules, a well-defined second coordination shell may provide an…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMolecular Limit of a Bulk Semiconductor: Size Dependence of the "Band Gap" in CdSe Cluster MoleculesV. N. Soloviev, A. Eichhöfer, D. Fenske, and U. BaninView Author Information Department of Physical Chemistry and the Farkas Center for Light Induced Processes The Hebre…
Water soluble thiol capped CdTe nanocrystals are assembled into ultrathin films in combination with poly(diallyldimethylammonium chloride) (PDDA) by the self-assembly method of layer-by-layer adsorption of oppositely charged polyelectrolytes. Electroluminescent devices, which produce different color emissions, are fab…
A study of the complex permittivity in bismuth titanate was conducted to reveal the nature of an anomaly in the real part of the permittivity, which occurs below the Curie temperature. This anomaly is frequency dependent and is caused by a combination of two relaxation phenomena that appear in the imaginary part of th…
The high intensity of third-generation X-ray sources, along with the development of cryo-cooling of protein crystals at temperatures around 100 K, have made it possible to extend the diffraction limit of crystals and to reduce their size. However, even with cryo-cooled crystals, radiation damage becomes a limiting fac…
We have investigated the field emission properties of nanotube thin films deposited by a plasma enhanced chemical vapor deposition process from 2% CH4 in H2 atmosphere. Depending on the deposition of the metallic catalyst [Fe(NO3)3 in an ethanol solution or sputtered Ni] the nanotube films showed a nested or continuou…
ABSTRACT: The physicochemical differences between pork and fish gelatin and the effect of melting point on the sensory characteristics of a gelatin‐water gel were investigated. Gelatin gel strength (measured as Bloom) and melting point of gelatin gels were measured, and quantitative descriptive analysis sensory tests…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA High-Spin Cyanide-Bridged Mn9W6 Cluster (S = 39/2) with a Full-Capped Cubane StructureZhuang Jin Zhong, Hidetake Seino, Yasushi Mizobe, Masanobu Hidai, Akira Fujishima, Shin-ichi Ohkoshi, and Kazuhito HashimotoView Author Information Kanagawa Academy of Science and T…
Mesoporous carbon materials are desirable electrode materials and are also useful for the separation of bulky organics. In this article, the templated synthesis of a new high surface area mesoporous carbon using hexagonal mesoporous silica (HMS) aluminosilicate is reported. Preliminary results on the electrochemical d…
Abstract X-ray diffraction is used widely for quantitative analysis of geological samples but studies which document the accuracy of the methods employed are not numerous. Synthetic sandstones of known composition are used to compare a ‘routine application’ of a Rietveld and a reference intensity ratio (RIR) method of…
Crystal structures and ferroelectric properties of a series of Bi-layered compounds, ${\mathrm{CaBi}}_{2}{\mathrm{Ta}}_{2}{\mathrm{O}}_{9},$ ${\mathrm{SrBi}}_{2}{\mathrm{Ta}}_{2}{\mathrm{O}}_{9},$ and ${\mathrm{BaBi}}_{2}{\mathrm{Ta}}_{2}{\mathrm{O}}_{9},$ were investigated. The structures of ${\mathrm{CaBi}}_{2}{\mat…