Materials Literature
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The compound YBaMn 2 O 5.5, having only Mn 3+, has been prepared by carefully oxidizing/reducing YBaMn 2 O 5 /YBaMn 2 O 6 . We have determined its crystal ( Icma, a ≈ 8.161, b ≈ 7.546, c ≈ 15.279 Å) and magnetic (collinear antiferromagnetic) structures using neutron powder diffraction as a function of temperature. The…
Dielectric relaxation measurements were performed on a series of poly(di- n -alkylitaconate)s with various side-chain lengths. The experimental data were analyzed by adjustment with one or the sum of several Havriliak−Negami functions. They demonstrated the existence of several relaxation processes with significant di…
I explore the polarization characteristics of a wire-grid polarizer operating in a rotating platform using well-established rigorous coupled-wave analysis. The results show that the performance of a wire-grid polarizer evaluated in transmittance and extinction ratio is substantially degraded with rotation, although it…
We report a method for fabricating ordered spatial arrangements of pre-synthesized CdS nanoparticles in thin block copolymer templates by first selectively dispersing these nanoparticles in one particular block of a diblock copolymer, in bulk, by means of dipole–dipole interactions and then using solvent selectivity t…
Säurespezifische Konformationsänderungen: Die Protonierung von meso-Aryl-substituiertem Rubyrin 1 mit HCl und CF3CO2H bewirkt unterschiedliche Konformationsänderungen, wie die Verschiebungen der UV/Vis-Absorptionsbanden relativ zu denen der freien Base belegen (Cl−: Blauverschiebung; CF3CO2−: Rotverschiebung). Die deu…
Two-dimensional correlation spectroscopy has been applied to study PMPCS (poly{2,5-bis[(4-methoxyphenyl)oxycarbonyl]styrene}), a representative example of mesogen-jacketed liquid crystalline polymers. With the precise analysis of a series of Fourier transform infrared (FTIR) spectra of PMPCS recorded at varied tempera…
Spinel cobalt ferrite in the form of nearly spherical particles, having a narrow range of particle size around 7.6nm, was produced by forced hydrolysis. Between the magnetization blocking temperature of 180K and the Mössbauer blocking temperature of 270K, the magnetic anisotropy energy decreases rapidly with temperatu…
The dielectric properties of tantalum-doped BaTi 0.85 Zr 0.15 O 3 were investigated. The conventional solid-state reaction method was used to make the ceramic samples. The composition was close to the pinch point of the three structure phase transitions in BaTiO 3 . Powder X-ray diffraction results indicated that the…
A stereoregular poly(phenylacetylene) bearing the aza-18-crown-6 ether as the pendant (poly- 1 ) formed a predominantly one-handed helical conformation upon complexation with optically active bis(amino acid)s such as l -homocystine perchlorate ( l - 2 ) in acetonitrile, and the complex solution gradually gelled with t…
Unusual conductivity effects: Suitably functionalized dendrimers (see picture) are capable of forming truly covalent three-dimensional networks with remarkably high conductivity on electrochemical doping. Depending on the charging level of the electroactive components used as building blocks for the dendrimer core and…
Ab initio calculations reveal distinct electronic properties associated with functionalized single-wall carbon nanotubes (SWNTs) with monovalent sidewall additions. The metallic tubes are found to be more reactive than the semiconducting ones. The hybridization between the addend and the tube induces unique impurity s…
Granular simulations are used to probe the particle scale dynamics at short, intermediate, and long time scales for gravity-driven, dense granular flows down an inclined plane. On approach to the angle of repose, where motion ceases, the dynamics become intermittent over intermediate times, with strong temporal correl…
The calculation of the nonresonant Raman spectrum of double-walled carbon nanotubes (DWCNT's) is performed in the framework of the bond polarization theory, using the spectral moment method. The calculation of the Raman spectrum of DWCNT's as a function of the diameter and chirality of the inner and outer tubes allows…
Acid-specific conformational changes: Protonation of meso-aryl-substituted rubyrin 1 with HCl or CF3CO2H causes different conformational changes, as revealed by specific shifts in the UV/Vis absorption bands relative to those of the free-base form (Cl−: blue shift; CF3CO2−: red shift). The distinct counteranion-depend…
Engineering applications of carbon nanofibers and nanotubes require their alignment in specific directions. Single-walled carbon nanotubes can be aligned in a magnetic field due to the presence of small amounts of catalyst elements, such as Ni and Co. However, for carbon nanofibers, their extremely low magnetic suscep…
Gold auf nanokristallinem Ceroxid katalysiert die Homokupplung von Phenylboronsäure-Derivaten in Gegenwart der Base K2CO3 hoch aktiv und selektiv (siehe Schema). Au3+-Spezies werden als aktive Zentren postuliert, und Wasser ist erforderlich, um Hydroxygruppen an der Oberfläche zu erzeugen, die die Boronsäure aktiviere…
Abstract Dendrimers have attracted immense attention during the last decade due to their interesting properties both from a basic and an applied research viewpoint. Encapsulation of metal nanoparticles for catalysis, drug delivery and light harvesting are only some applications of dendrimers that are breaking new grou…
Abstract Pasteurization is an important, if not the most important, process step in the packaging of milk. It is subject to alterations stemming from the variation in the temperature, pH and raw milk quality. The variability may manifest itself in changes in the formation of the deposit (fouling) in the pasteurization…
The X-ray crystallographic structures, the magnetic susceptibilities from 2 to 300 K, and a theoretical analysis of the magnetism for a triangular and a tetranuclear molecule consisting of linked high-spin cobalt(II) centers are described. The interpretation of the magnetic data for the triangular compound [Co(depa)Cl…
Abstract Water‐reducible acrylic–alkyd resins were synthesized from the reaction between monoglycerides prepared from modified palm oil and carboxy‐functional acrylic copolymer followed by neutralization of carboxyl groups with diethanolamine. Modified palm oil was produced by interesterification of palm oil with tung…