Materials Literature
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Copper and copper oxides (Cu 2 O and CuO) have been deposited by evaporation of copper and subsequent oxidizing treatments, on the surface of flat SiO 2 and ZrO 2 substrates. Large variations of several eVs have been found in the values of the Cu 2p 3/2 binding energy (BE) and Auger parameter (α‘) of copper as a funct…
Niobium (Nb) and strontium (Sr) doped barium titanate (BT) films were deposited by radio frequency (RF) magnetron sputtering with Nb and Sr doped BT ceramic targets, respectively. The effect of Nb and Sr doping on the crystal structure of epitaxial BaTiO 3 thin films on MgO substrates was investigated. The crystal str…
A series of novel amphiphilic graft copolymers having a hydrophilic poly(2-hydroxyethyl methacrylate) [poly(HEMA)] or water-soluble poly(2,3-dihydroxypropyl methacrylate) [poly(DHPMA)] backbone and hydrophobic poly(dimethylsiloxane) (PDMS) side chains have been synthesized to develop a model system to examine surface…
La synthèse de nouveaux macrocycles tetrapyrazoliques dotés de deux bras latéraux fonctionnalisés est décrite, ces structures macrocycliques différent par la taille de la cavité macrocyclique. Les matériaux membranaires sont obtenus par photopolymérisation d'une formulation, contenant le monomère actif, étalée sur un…
Ti 3 SiC 2 exhibits a unique combination of ceramic and metallic properties suitable for both electrical and mechanical application. With high-temperature stability, high electrical and thermal conductivity and resistance to oxidation, Ti 3 SiC 2 has proven promising as a contact layer for high power SiC semiconductor…
The interaction of trivalent lanthanides with sodium dodecyl sulfate micelles (SDS) in aqueous solution has been studied by a variety of experimental techniques. Potentiometric measurements with a sodium selective electrode, steady-state fluorescence spectra of Ce(III), emission lifetime measurements of Ce(III), Tb(II…
An isotactic polypropylene (iPP) sample (100% by FTIR) has been thermooxidized in the temperature range 80−170 °C and the kinetics of the degradation followed by measuring the chemiluminescence intensity along the induction and autoacceleration stages. From those curves, the parameter p 0, related to the initial conce…
Abstract Chemical polymerization of o‐toluidine (OT) in the presence of nylon 6 and wool fibers initiated by peroxomonosulphate (PMS) in an aqueous acidic medium was carried out under nitrogen atmosphere. During the polymerization process, graft copolymers were formed along with homopolymers of OT. A procedure is give…
We report on the characterization of a number of random copolymers of “para” poly(2,5-pyridinediyl) (PPY) and “meta” poly(2,6-pyridinediyl) (PmPY). We demonstrate some ability to control the photophysical properties by variation of the ratio of the monomeric components of the copolymers. These effects, in both film an…
A significant reduction in the glass transition temperature ( T g ) is found for poly( l -(−) lactide) (PLLA), crystallized under partially constrained conditions, where the polymer is prevented from shrinking. It is proposed that the constrained crystallization process results in increasing the net free volume in the…
We explore the possibility that the unusually large electroclinic effect observed in the smectic-A phase of a ferroelectric liquid crystal arises from the presence of an ordered array of disclination lines and walls in a smectic-C* phase. If the spacing of these defects is in the subvisible range, this modulated smect…
Nanomagnets have been created by the incorporation of magnetic clusters into mesoporous silica. It is shown that, for a given cluster, the pore size has a strong influence on the degree of incorporation. Furthermore, the incorporation of these nanoclusters into three-dimensional organized mesoporous silica ensures tha…
Polymeric nanomicelles that allow control of the location of porphyrin moieties in the coronas, cores, or cores and coronas have been designed and reliably constructed by self- assembly of porphyrin-centered star polymers (see Figure). These photofunctional nanomicelles are of interest for advanced materials, pharmace…
High-speed persistent spectral hole burning (PSHB), 30 times faster than in a similar H2 gas treated glass, has been achieved for a samarium(II)-doped alumina–silica glass upon irradiation with X-rays. Glasses of this type, enabling fast and highly efficient hole burning, are excellent candidates for binary high-densi…
Layer-by-layer deposition of polythiophene (see Figure) has successfully been carried out using only polyanion and polycation dilute solutions of polythiophene. The synthesis and characterization of these assemblies, as well as their optical properties, are described. The conductivities of the regioregular polythiophe…
We have experimentally investigated the diameter dependence of Coulomb effects on the optical transition in semiconducting single-walled carbon nanotubes. The absorption band due to the lowest band-to-band transition shifts to the higher-energy side compared to the transition energy calculated by a tight-binding model…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTEncapsulation of Hydrophilic Pincer−Platinum(II) Complexes in Amphiphilic Hyperbranched Polyglycerol NanocapsulesMartijn Q. Slagt, Salah-Eddine Stiriba, Robertus J. M. Klein Gebbink, Holger Kautz, Holger Frey, and Gerard van KotenVi…
Hydrocarbon fuels have specific energy contents some two orders of magnitude greater than any electrical storage device. They therefore proffer an ideal source in the universal quest for compact, lightweight, long-lasting alternatives for batteries to power the ever-proliferating electronic devices. The motivation lie…
The study of poly( n -hexyl methacrylate) has been performed by both thermo-stimulated currents (TSC) and dynamic dielectric spectroscopy (DDS) in order to better define the nature of molecular mobility in the glass transition temperature range. TSC results reveal the existence of three dipolar relaxation modes: α, as…
Abstract The uncatalyzed cure of a commercial tetrafunctional epoxy monomer TGDDM ( N,N,N ′, N ′‐tetraglycidyl‐4,4′‐diaminodiphenylmethane) with hexahydrophthalic anhydride (HHPA), using variable stoichiometric ratios is reported. The reaction was followed by differential scanning calorimetry (DSC). Two kinds of exper…