Materials Literature
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ZnO films were electrodeposited on porous silicon templates with different porosities. The photoluminescence (PL) spectra of the samples before and after deposition of ZnO were measured to study the effect of template porosity on the luminescence properties of ZnO/porous Si composites. As-prepared porous Si (PS) templ…
Auf den Punkt gebracht: Der Zeolithkatalysator TS-1B für die Oxidation von Benzol mit Wasserstoffperoxid wird durch Modifizierung von Titan-Silicalit mit NH4HF2 und H2O2 erhalten. In Gegenwart von Sulfolan bleibt die Oxidation mit diesem neuen Katalysator selektiv auf der Stufe von Phenol stehen (siehe Schema).
The development of a high efficiency thermoelectric (TE) stack, which is a united system of thermoelectric modules and a heat exchanger, has been made to advance the applications of electrical power generation to vehicles. The thermoelectric materials under investigation are mostly heavily doped CoSb/sub 3/ and filled…
Pressure and photoirradiation effects on the structural properties were investigated for a transition metal cyanide, $\mathrm{RbMn}[\mathrm{Fe}(\mathrm{CN}{)}_{6}],$ with perovskitelike structure by means of high-angle resolved synchrotron-radiation x-ray powder diffraction. We have found that (1) photoirradiation by…
Magnetic properties after irradiation of a 1:4 mixture of Co(SCN)2 and 4-(alpha-diazobenzyl)pyridine in frozen solution were investigated by ac and dc magneto/susceptometry. Observations of the frequency dependence of chi'' signals and of a hysteresis loop at 2 K in ac and dc measurements, respectively, indicate that…
A series of sulfated zirconia samples were synthesized by a two-step sol−gel technique using zirconium propoxide as a precursor having two different concentrations, hydrolyzed with aqueous ammonia at pH 9−10 and sulfated with sulfuric acid. Effects of various synthetic parameters were studied on the structural, textur…
A novel hydrogel system based on oligo(poly(ethylene glycol) fumarate) (OPF) is currently being investigated as an injectable carrier for marrow stromal cells (MSCs) for orthopedic tissue engineering applications. This hydrogel is cross-linked using the redox radical initiators ammonium persulfate (APS) and ascorbic a…
Through the incorporation of a phenanthroline ligand into the oxazine moiety of photochromic spirooxazines, a series of photochromic spirooxazine-phenanthroline metal complexes have been synthesized, resulting in tunable and significantly increased photoresponsivities. Such systems are of interest for the investigatio…
Up to fifteen electrons are reversibly accommodated in a triply fused porphyrin dimer conjugated to two [60]fullerene moieties. Its photophysical properties differ completely from those of the many known porphyrin–fullerene dyads: Photoexcitation of the C60 moieties results in quantitative sensitization of the low-lyi…
Abstract The effects of emulsifiers (glyceryl monostearate and polyglycerol ester) and air inclusion on the structure of sponge batters were studied. Batter samples, immediately after mixing in a continuous mixer, were imaged for bubbles using an optical microscope and a CCD video camera. The bulk rheology of the batt…
The approach proposed by Choi and Ihm for calculating the ballistic conductance of open quantum systems is generalized to deal with magnetic transition metals. The method has been implemented with ultrasoft pseudopotentials and plane wave basis set in a DFT-LSDA ab-initio scheme. We present the quantum-mechanical cond…
The electrical resistance decay of a metallic granular packing has been measured as a function of time. This measurement gives information about the size of the conducting cluster formed by the well connected grains. Several regimes have been encountered. Chronologically, the first one concerns the growth of the condu…
We present a model for molecular materials (MM) made up of polar and polarizable molecular units. A simple two-state model is adopted for each molecular site and only classical intermolecular interactions are accounted for, neglecting any intermolecular overlap. The complex and interesting physics driven by interactio…
A ${\mathrm{Mn}}_{4}$ single-molecule magnet is used to show that quantum tunneling of magnetization is not suppressed by moderate three-dimensional exchange coupling between molecules. Instead, it leads to an exchange bias of the quantum resonances which allows precise measurements of the effective exchange coupling…
We present x-ray absorption spectra around the 3d-4f and 4d-4f excitation thresholds of in-plane magnetized Gd and Tb films measured by total electron yield using circularly polarized synchrotron radiation. By matching the experimental spectra to tabulated absorption data far below and above the thresholds, the imagin…
Stopping the rot! The selective oxidation of benzene to phenol with hydrogen peroxide is achieved by using a new zeolite catalyst (TS-1B), obtained by the modification of titanium silicalite with NH4HF2 and H2O2 (see scheme). The new catalyst, used in presence of a particular cosolvent (sulfolane) protects the produce…
An approach is presented for the atomistic study of phonon transport in real dielectric nanowires via Green functions. The formalism is applied to investigate the phonon flow through nanowires coated by an amorphous material. Examples for a simple model system, and for real Si nanowires coated by silica are given. New…
BACKGROUND: Superparamagnetic iron oxides (SPIO) are being used to label cells for in vivo monitoring by magnetic resonance imaging (MRI). The purpose of this study is to present protocols using SPIO and a polycationic transfection agent for magnetic labeling of cells as a basis for cellular MRI. METHODS: Various conc…
This paper describes a new method for fabricating a gas sensor composed of multi-wall carbon nanotubes (MWCNTs) using dielectrophoresis (DEP). MWCNTs dispersed in ethanol were trapped and enriched in an interdigitated microelectrode gap under the action of a positive DEP force that drove the MWCNTs to a higher electri…
Single crystals of the entire series of ${A}_{2}{\mathrm{Ti}}_{2}{\mathrm{O}}_{7}$ $(A=\mathrm{Sm}$ to Lu, and Y) pyrochlore compounds were irradiated by 1-MeV ${\mathrm{Kr}}^{+}$ ions at temperatures from 293 to 1073 K, and the microstructure evolution, as a function of increasing radiation fluence, was characterized…