Materials Literature
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Artificial antenna systems: Zeolite L crystals loaded with a fluorescing donor dye and modified at the external surface with an acceptor dye are studied on a semiconductor surface (see picture). Radiationless excitation energy transfer from the donor dye to the acceptor dye and further through a thin insulating layer…
This paper describes the synthesis and characterization of a novel series of copolymers with different lengths of oligo(phenylene vinylene) (OPV) as the rod block, and poly(propylene oxide) as the coil block. Detailed characterization by means of transmission electron microscopy (TEM), atomic force microscopy (AFM), a…
Abstract The compounds [Hg 2 (μ—SePh) 2 (SePh) 2 (PPh 3 ) 2 ] ( I ) and [Hg 3 Br 3 (μ—SePh) 3 ] · 2 DMSO ( II ) are formed by reactions of [Hg(SePh) 2 ] with PPh 3 in THF( I ) or with HgBr 2 in DMSO ( II ) at room temperature. X—ray crystallography reveals that the cluster I consists of a distorted square built by eac…
Abstract New aryl‐terminated octaalkynyl tetrapyrazinoporphyrazines were prepared in three steps starting from functionalised bisarylalkynyl 1,2‐diones. While the tert ‐butylphenyl substituents were shown to aid solubility in organic solvents and to reduce chromophore aggregation efficiently, more hydrophilic tetrapyr…
The dynamics of ferroelectric hysteresis for Nd-substituted Bi 4 Ti 3 O 12 thin films as a function of frequency and amplitude of time-varying external electric field is measured utilizing a Sawyer–Tower (ST) circuit. The frequency ranges from 1 to 10 6 Hz and the amplitude range is 101–400 kV cm −1 . Given a fixed fi…
The formation of superabundant vacancies (SAVs; vacancy–hydrogen clusters) was studied in Nb–H alloys by means of resistivity measurements as a function of temperature, pressure and H concentration. The formation energy of a vac–H cluster (0.3 ± 0.1 eV), which is 1/10 of the formation energy of a vacancy in Nb, is exp…
The visualization of surface reactions on the atomic scale provides direct insight into the microscopic reaction steps taking place in a catalytic reaction at a (model) catalyst's surface. Employing the technique of scanning tunneling microscopy (STM), we investigated the CO oxidation reaction over the RuO2(110) and R…
In the framework of the perturbation theory an expression suitable for calculation of the effective conductivity of 3-D inhomogeneous metals in uniform magnetic field $H$ is derived. For polycrystals of metals with closed Fermi surfaces in high magnetic fields the perturbation series defining the longitudinal and the…
Eight novel three-coordinate boron compounds with the general formula BAr(2)L, in which Ar is mesityl and L is a 7-azaindolyl- or a 2,2'-dipyridylamino-functionalized aryl or thienyl ligand, have been synthesized by Suzuki coupling, Ullmann condensation methods, or simple substitution reactions (L = p-(2,2'-dipyridyla…
The use of carbon nanotubes in materials applications has been slowed due to nanotube insolubility and their incompatibility with polymers. We recently developed two protocols to overcome the insoluble nature of carbon nanotubes by affixing large amounts of addends to the nanotube sidewalls. Both processes involve rea…
We have studied the trends in CO adsorption on close-packed metal surfaces: Co, Ni, Cu from the 3d row, Ru, Rh, Pd, Ag from the 4d row and Ir, Pt, Au from the 5d row using density functional theory. In particular, we were concerned with the trends in adsorption energy, geometry, vibrational properties and other parame…
Temperature dependence of crystal structures is examined with X-ray diffraction at normal pressure or elevated pressures for solution-grown nylons with octamethylene moiety between amino or carboxy groups (nylons 82, 410, 610, 810). Although octamethylene moiety between amino groups has the potential to cause the phas…
The phase transitions of a ferroelastic CsPbCl 3 single crystal grown by using the Bridgman method have been investigated using 133 Cs and 207 Pb nuclear magnetic resonance (NMR). Two sets of seven-line 133 Cs NMR signals were obtained instead of a simple seven-line structure. From the experimental data, the 133 Cs NM…
The electronic ground state of RbMnFe(CN) 6 is calculated by using all-electron full-potential linearized augmented-plane–wave (FLAPW) method in the local density approximation (LDA).With using the tetragonally distorted structure determined by the x-ray diffraction (XRD) measurement, we obtain the ferromagnetic groun…
Neutron diffraction measurements for liquid (l-) Te and l-As–Te mixtures (10, 20, 30 and 40 at.% As) have been performed. The first minimum after the first peak of g ( r ) for l-Te and l-As–Te mixtures is filled up with temperature, and the second peak diminishes substantially and flattens out at high temperature. The…
Specific morphologies occasionally appear in the crystal growth in gels. Potassium dichromate (K 2 Cr 2 O 7 ) crystals grown in gelatin gel have been found to exhibit various morphologies by varying only initial concentrations of K 2 Cr 2 O 7 and gelatin in the medium. Particularly unique are huge helical crystals gro…
Neutron diffraction studies have been carried out on a single crystal of oxygen-deficient perovskite NdBaCo2O5 in the temperature range of 7-370 K. There have been observed, with decreasing temperature T, two magnetic transitions accompanied with structural changes, to the antiferromagnetic phase at ~360 K and to the…
Abstract The intercalation of four kinds of hexose for Mg–Al layered double hydroxide (LDH) by the calcination–rehydration reaction using the Mg–Al oxide precursor has been investigated. In spite of non-ionized organic guest, hexose was intercalated for the LDH, and the intercalation behavior of hexose was greatly inf…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPatterning of Conductive Polyaniline Films from a Polymerization-Induced Self-Assembled GelRethi Madathil, Raman Parkesh, Surendra Ponrathnam, and Maryanne C. J. LargeView Author Information SFI Nanoscience Laboratory, Trinity Colle…
Spent FCC catalyst was regenerated in a fluidized-bed reactor at 700 °C using a 2% O 2 in N 2 feed. The NO and CO emissions during regeneration were measured when Ag-based additives were used and compared with those when a commercial Pt-based CO promoter (1% CP-3) was added. All Ag/alumina additives exhibited high NO…