Materials Literature
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Abstract Inorganic/polymer Janus microspheres were fabricated successfully in a one-step process by miniemulsion polymerization. Our method involved the in situ miniemulsion polymerization of styrene and the in situ hydrolysis–condensation of tetraethoxysilane under basic conditions. By taking full advantage of phase…
The electronic paramagnetic resonance g factors g‖, g⊥of Dy3+centers and the hyperfine structure constants A‖and A⊥of161Dy3+and163Dy3+isotopes in ZrSiO4crystal are theoretically studied from the perturbation formulas of the spin Hamiltonian parameters for a 4f9ion in tetragonal symmetry. In these formulas, the contrib…
Abstract A metastable 3D supramolecular compound [Ag(NH3)2][Ag3(pzdca)2(NH3)4] (H2pzdca = pyrazine-2,3-dicarboxylic acid) (1) has been synthesized and characterized crystallographically. This study offers important information to in-depth understanding of the self-assembly process involving AgI under ammoniacal condit…
Protein phosphorylation plays an important role in cell signaling. However, in the Archaea, little is known about which proteins are phosphorylated and which kinases are involved. In this study, we identified, for the first time, a typical eukaryote-like Ser/Thr protein kinase and its protein partner, a forkhead-assoc…
Pure nanocrystalline forsterite ( Mg 2 SiO 4) powder was successfully synthesized by mechanochemical route and subsequent annealing. The starting materials were talc ( Mg 3 Si 4 O 10( OH )2) and magnesium carbonate ( MgCO 3) powders. To produce forsterite powder, first talc and magnesium carbonate powders were calcine…
Abstract Gold clusters with average diameters of 0.8, 1.5, and 1.9 nm were prepared on mesoporous silica (SBA-15) by controlling the calcination time of an Au11(PPh3)7Cl3/SBA-15 composite. It was found that the catalytic activity for benzyl alcohol oxidation decreased monotonically with the increase in size.
Abstract We have designed a chiral T-shaped compound possessing a flexible spacer, which was found to exhibit a blue phase III with a temperature range of about 30 K including room temperature on cooling. Furthermore, the BPIII changed to a glass phase. Electrooptical switching was observed at all temperatures of the…
We study the impact of the diagonal frustrating couplings on the quantum phase diagram of a two-leg ladder composed of alternating spin-1 and spin-1/2 rungs. As the coupling strength is increased the system successively exhibits two gapped paramagnetic phases (a rung-singlet and a Haldane-like non-degenerate states) a…
We study the enhancement of the magnetic transition temperature Tc due to incident light in ferromagnetic semiconductors such as EuS. The photoexcited carriers mediate an extra ferromagnetic interaction due to the coupling with the localized magnetic moments increasing the Tc. The Hamiltonian consists of a Heisenberg…
Perfect lensing and cloaking based on complementary media are possible applications of negative refractive index materials. Metamaterials represent the natural candidates to realize such property by tailoring the effective dielectric permittiviy and magnetic permeability. The fine tuning of $n<0$ of metamaterials is l…
Spin-dependent transport was investigated in a spin metal-oxide-semiconductor field-effect transistors (spin MOSFET) with ferromagnetic MnAs source and drain (S/D) contacts. The spin MOSFET of bottom-gate type was fabricated by photolithography using an epitaxial MnAs film grown on a silicon-on-insulator (SOI) substra…
We report on photoluminescence (PL) measurements at 85 K for GaN/AlGaN surface quantum wells (SQW's) with a width in the range of 1.51-2.9 nm. The PL spectra show a redshift with decreasing SQW width, in contrast to the blueshift normally observed for conventional GaN QW's of the same width. The effect is attributed t…
Microbiologically influenced corrosion of steel in anaerobic environments has been attributed to hydrogenotrophic microorganisms. A sludge sample collected from the bottom plate of a crude-oil storage tank was used to inoculate a medium containing iron (Fe(0)) granules, which was then incubated anaerobically at 37 deg…
Les Oligothiophènes sont étudiés depuis une quinzaine d’années dans le cadre du développement d’applications électroniques et plus particulièrement des transistors à effet de champ organiques (OFETs). Dans ce contexte, une série de dialkylterthiophènes a été synthétisée et l’organisation supramoléculaire a été caracté…
Zu Beginn der Arbeit wurden Experimente zur Stabilisierung von Calciumphosphat Nanopartikeln mit Polyaminosäuren (PAsp und PLys) durchgeführt. Hier kristallisierte sich heraus, dass verschiedene Kettenlängen der Aminosäuren keinen Einfluss auf die Partikelgröße haben, aber längere Ketten zu einheitlicheren DLS Ergebni…
In the framework of CDM, the evolution of the plastic strain, at which damage processes initiates, as a function of stress triaxiality, making the assumption of constant damage dissipated work is derived. Based on this, the CDM model proposed by Bonora (Eng. Frac. Mech., 58, 1-2, 1997) has been used to predict the occ…
Les necessitats de la tecnologia moderna, juntament amb les mesures mediambientals cada cop mes severes, han dut a la recerca de nous materials d’elevades prestacions que superin les propietats dels materials coneguts fins al moment. A mesura que la mida es redueix al rang nanometric, els materials mostren propietats…
The conclusions of this presentation are: (1) Amine boranes potentially can be used as a vehicular hydrogen storage material. (2) Purity of the hydrogen stream is critical for use with a fuel cell. Pure H{sub 2} can be provided by carefully conditioning the fuel (encapsulation, drying, heating rate, impurities). (3) T…
The objectives of this work are the realization, characterization and optimization of nanostructured surfaces, e.g. substrates for the surface-enhanced Raman spectroscopy and the surface plasmon resonance. Several main contributions were performed. The first one is based on the grafting of silver and gold nanoparticle…
An overview of organic electronic electrooptic materials and the applications of those materials in prototype devices is given. This overview is set in the context of competing technologies. Quantum and statistical mechanical theoretical methods have recently provided significantly improved guidance in understanding o…