Materials Literature
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${\mathrm{Ba}}_{0.5}{\mathrm{Sr}}_{1.5}{\mathrm{Zn}}_{2}{\mathrm{Fe}}_{12}{\mathrm{O}}_{22}$ is a promising multiferroic compound in which the electric polarization is intimately connected to the magnetic state. In principle, ferroelectrity might exist above the room temperature, but the electrical conductivity that i…
Colloidal dispersions of Laponite platelets are known to age slowly from viscous sols to colloidal glasses. We follow this aging process by monitoring the diffusion of probe particles embedded in the sample via dynamic light scattering. Our results show that the time-dependent diffusion of the probe particles scales w…
Abstract Summary: Evidence of clay migration from the core to the surface of poly(propylene)/montmorillonite nanocomposites is provided. A three‐ to fivefold increase in the clay concentration of the surface is obtained during isothermal heating in oxidative atmosphere. The mechanism of migration is investigated by me…
Abstract For economic reasons, reaction rate and energy efficiency of ultrasonic devices need to be higher. In this investigation, it was found that the 850 kHz ultrasonic device achieves a higher energy efficiency and a higher sonochemical reaction rate than the 24 or 30 kHz device during the oxidation of KI or the d…
Abstract Transparent superhydrophobic surfaces were prepared by self‐assembly of hydrophobic n‐octa‐ decyltrimethoxysilane (H 3 C(CH 2 ) 17 Si(OCH 3 ) 3 , ODS) and (3,3,3‐trifluoropropyl)trimethoxysilane (F 3 C(CH 2 ) 2 Si(OCH 3 ) 3 , FAS3) monolayers from gas phase on transparent nanoporous alumina surfaces. Water co…
Abstract Summary: Chain‐growth polycondensations of 3‐aminobenzoic acid methyl esters 1a and 1b , bearing a tri‐ or tetra(ethylene glycol) methyl ether unit on the amino group, respectively, were carried out with lithium hexamethyldisilazide (LiHMDS) as a base and phenyl 4‐methylbenzoate ( 2 ) as an initiator in THF a…
The low-lying electronic states of the nickel monohalides, i.e., NiF, NiCl, NiBr, and NiI, are investigated by using multireference second-order perturbation theory with relativistic effects taken into account. For the energetically lowest 11 lambda-S states and 26 omega states there into, the potential energy curves…
Abstract Due to their excellent wear and corrosion properties, nanocrystalline cobalt and several cobalt alloys made by electrodeposition are currently being developed as environmentally benign replacement coatings for hard chromium electrodeposits. The focus of this study is on the mechanical properties of nanocrysta…
Abstract Noncentrosymmetric molecules with a π‐conjugated system and, among them, push–pull molecules such as pyridinium phenoxide, are a promising new class of materials for applications in optoelectronics due to their nonlinear optical (NLO) properties. Modelling studies have indicated that an increase in the twist…
Metal-radical alternating chains [Co(hfac)2HNN]n crystallized in two morphs containing repeating all-cis (alpha) and cis,cis,trans (beta) configurations with respect to the O(HNN)-Co-O(HNN) geometry (HNN = 4,4,5,5-tetramethylimidazolin-1-oxyl 3-oxide). Both phases showed magnetization jumps with hysteresis at 2 K. The…
The ground-state electronic structure of the trinuclear complex Cu3(dpa)4Cl2 (1), where dpa is the anion of di(2-pyridyl)amine, has been investigated within the framework of density functional theory (DFT) and compared with that obtained for other known M3(dpa)4Cl2 complexes (M = Cr, Co, Ni) and for the still hypothet…
Nanoparticles are metastable relative to the equivalent bulk material due to the positive excess interfacial free energy (IFE). Previous studies have shown that, with increasing surface interaction strength, the IFE diminishes but remains positive. We describe an experimental multicomponent system in which a nanoscale…
Abstract A new class of single‐walled carbon nanotube (SWNT) derivatives have been synthesized by means of an oxidation route that leads to shortened nanotubes bearing carboxylic acid end groups. The simultaneous attachment of poly(ethylene glycol)amine (PEG–NH 2 ) and amine derivatives of aromatic fluorophores was ac…
The adsorption of 2-mercaptobenzoxazole on copper has been investigated by means of surface-enhanced Raman scattering (SERS) by doping smooth copper surfaces with silver colloidal nanoparticles. The metal surfaces have been characterized by means of atomic force microscopy measurements. The compound adsorbs on the Cu/…
The gene hyuP from Microbacterium liquefaciens AJ 3912 with an added His6 tag was cloned into the expression plasmid pTTQ18 in an Escherichia coli host strain. The transformed E. coli showed transport of radioisotope-labeled 5-substituted hydantoins with apparent K(m) values in the micromolar range. This activity exhi…
Abstract Summary: The microwave (MW)‐assisted lipase‐catalyzed ring‐opening polymerization of ε ‐caprolactone in boiling solvents was investigated for the first time. In case of boiling toluene or benzene the MW‐assisted reaction proceeded significantly slower compared to oil bath heating. On the other hand, using boi…
The structural analysis of natural protein fibers with mixed parallel and antiparallel beta-sheet structures by solid-state NMR is reported. To obtain NMR parameters that can characterize these beta-sheet structures, (13)C solid-state NMR experiments were performed on two alanine tripeptide samples: one with 100% para…
Teilchen aus Drähten: Eine feine Balance aus Wasserstoffbrücken-, π-Stapel- und Van-der-Waals-Wechselwirkungen ermöglicht in nichtpolaren Kohlenwasserstoffen die konzentrationsgesteuerte Selbstorganisation eines kurzen molekularen Drahtes zu Nanopartikeln und fluoreszierenden Mikrokügelchen. Oberhalb einer kritischen…
beta-Ketoacyl-ACP synthases catalyze the condensation steps in fatty acid and polyketide synthesis and are targets for the development of novel antibiotics and anti-obesity and anti-cancer agents. The roles of the active site residues in Streptococcus pneumoniae FabF (beta-ketoacyl-ACP synthase II; SpFabF) were invest…
Single molecule spectroscopy is applied in studies of diffusion and surface adsorption in sol-gel-derived mesoporous silica thin films. Mesoporous films are obtained by spin casting surfactant-templated sols onto glass substrates. Small-angle X-ray diffraction results are consistent with hexagonally ordered mesophases…