Materials Literature
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The molecular mechanism of precursor evolution in the synthesis of colloidal group II-VI semiconductor nanocrystals was studied using 1H, 13C, and 31P NMR spectroscopy and mass spectrometry. Tri-n-butylphosphine chalcogenides (TBPE; E = S, Se, Te) react with an oleic acid complex of cadmium or zinc (M-OA; M = Zn, Cd)…
Structural genomics projects are providing large quantities of new 3D structural data for proteins. To monitor the quality of these data, we have developed the protein structure validation software suite (PSVS), for assessment of protein structures generated by NMR or X-ray crystallographic methods. PSVS is broadly ap…
The effects of thickness extension mode resonance oscillation (TERO) of acoustic waves on ethanol decomposition over thin AgAu binary alloy film catalysts were studied. TERO enhanced the activity of the alloy catalysts for both ethylene and acetaldehyde production. The activation for ethylene production by TERO was ne…
Thermal conductivity of ${\mathrm{CO}}_{2}$ and ${\mathrm{N}}_{2}\mathrm{O}$ solids has been investigated over the temperature range $1--40\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The thermal conductivity coefficient of ${\mathrm{CO}}_{2}$ and ${\mathrm{N}}_{2}\mathrm{O}$ exhibits, in the whole investigated temperature…
Novel amphiphilic, thermo-responsive polyaspartamides which showed both LCST (lower critical solution temperature), and sol-gel transition were prepared and characterized. The polyaspartamide derivatives were synthesized from polysuccinimide, the polycondensate of aspartic acid monomer, via successive nucleophilic rin…
The novel cluster anion [Co(11)Te(5)(CO)15]- ([3]-) has been isolated and structurally characterized as part of the salt [Cp*(2)Nb(CO)2][3] (Cp* = C(5)Me(5)). The cobalt-centered Co10 pentagonal prism is surrounded by a shell of two mu5-Te, three mu4-Te ligands, and 15 CO groups in terminal, symmetrical, and sigma-sem…
The adsorption of polymer and surfactant molecules onto colloidal particles or droplets in solution can be characterized non-destructively by scattering techniques. In a first part, the general framework of Dynamic Light Scattering, Small Angle Neutron and X-ray Scattering for the determination of the structure of ads…
The structure of spherical brushes formed by symmetric diblock polyampholytes end-grafted onto small spherical particles in aqueous solution is examined within the framework of the so-called primitive model using Monte Carlo simulations. The properties of the two blocks are identical except for the sign of their charg…
Two organometallic compounds containing zinc and manganese in different ratios are used as single-source precursors for the preparation of various new, bimetallic oxide materials with nanoscaled dimensions. It is shown that the materials synthesis can be performed in the solid-state, the liquid-phase, and even in the…
The title compound, K3.5[H4.5α-PtMo6O24]·5.5H2O, containing the hexamolybdoplatinate(IV) polyanion, was isolated at pH 2.85. The complete polyanion has no crystallographic symmetry. The [H4.5α-PtMo6O24]3.5− polyanions form an inversion-generated dimer, viz. [H9(PtMo6O24)2]7−, via seven strong hydrogen bonds, one of w…
An InNbO4 thin film was prepared by a sol-gel method. The photoinduced amphiphilic (hydrophilic and lipophilic) property on the film was determined from the changes in contact angles for water and diiodomethane (CH2I2) under light (lambda>300 nm) irradiation. Before light irradiation, the contact angles for water and…
Polysiloles have recently received much attention1 because of their unusual electronic properties. These unusual optical and electrical properties can be useful in electronic devices, such as electron transporting materials,2 light-emitting diodes (LEDs),3-5 and chemical sensors.6,7 Poly(2,3,4,5-tetraphenyl)siloles (1…
The cloudiness of hydrogen-bonded LBL films assembled from polyvinylpyrrolidone (PVPON) and poly(acrylic acid) (PAA) is studied in detail by two approaches: spectroscopy (Fabry-Pérot fringes) and microscopy (AFM). Fabrication parameters such as temperature, molecular weight, pH value, and rinsing time, have notable in…
Dielectric studies of methyl acrylate with 1-propanol, 1-butanol, 1-heptanol and 1-octanol binary mixtures have been carried out over the frequency range from 10 MHz to 10 GHz at temperatures of 283, 293, 303 and 313 K using Time Domain Reflectometry (TDR) for various concentrations. The Kirkwood correlation factor an…
Fuel cells offer the prospect of silent electrical power generation at high efficiency with near-zero pollutant emission. Many materials and fabrication problems have now been solved and attention has shifted toward system modeling, including the fluid flows that supply the cells with hydrogen and oxygen. This review…
Hollow triangular cones of packed calcite needles, which have never been seen before in natural biominerals, were prepared using a double-decomposition precipitation method. These are shown to be oriented attachments of inverted triangular cones toward crystalline superstructures in addition to “mesocrystal” formation.
The replica RISM theory is used to investigate the structure of electrolyte solutions confined in carbonized polyvinylidene chloride (PVDC) nanoporous material, compared to bulk electrolyte solution. Comparisons are made between the models of electrolyte solution sorbed in the carbonized PVDC material and a single car…
Using the first-principles plane-wave pseudopotential method within density functional theory, we have systematically investigated structural, electronic, and mechanical properties of , (; ; and ) nanowires and bulk phase of . We found that not only , but also transition metal and chalcogen atoms lying in the same col…
Zwei in Eins: Ein an zwei photochrome Einheiten gebundenes Porphyrin fungiert als digitaler 2:1-Multiplexer (MUX). Wärme und rotes Licht sind die Eingangsdaten (ein 1 und ein 2), und ein dritter, schaltbarer Eingang (grünes Licht, sel) entscheidet, ob als Ausgang (Porphyrinfluoreszenz) der Zustand von „ein 1“ oder von…
Formation of nanostructured hexagonal alkali tungstates (HTBs) from ammonium metatungstate (AMT) and alkali chlorides has been investigated by a combined strategy encompassing in situ spectroscopic techniques and hydrothermal synthetic studies. They demonstrate how the morphology of the HTBs can be tuned by the straig…