Materials Literature
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The synthesis of marokite CaMn(2)O(4) nanowires using a hydrothermal method is reported. Transmission electron microscopy and electron diffraction measurements show that the nanowires are polycrystalline in nature with diameters between 10 and 20 nm and lengths ranging from approximately 100 to 500 nm. Most interestin…
Self-organized chains and stripes of silver nanoparticles have been elaborated by ion-beam sputtering shadow deposition onto faceted alumina substrates. We show that the in-plane organization of the silver nanostructures can be controlled through the grazing-incidence conditions (angle and orientation of the atomic be…
We consider a model for periodic patterns of charges constrained over a cylindrical surface. In particular we focus on patterns of chiral helices, achiral rings, or vertical lamellae, with the constraint of global electroneutrality. We study the dependence of the patterns' size and pitch angle on the radius of the cyl…
Amorphous lithium borate films are prepared by ion-beam sputtering using a $0.2\phantom{\rule{0.3em}{0ex}}{\mathrm{Li}}_{2}\mathrm{O}∙0.8\phantom{\rule{0.3em}{0ex}}{\mathrm{B}}_{2}{\mathrm{O}}_{3}$ glass as a target material. The films of a thickness between 7 and $700\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ are deposi…
The structural configuration of Xe clusters, obtained by ion implantation in a Si matrix, has been investigated as a function of the temperature by x-ray absorption fine structure spectroscopy. In contrast with previous results, we demonstrate that an accurate analysis of the data, using high order cumulants, gives ev…
We introduce models of heterogeneous systems with finite connectivity defined on random graphs to capture finite-coordination effects on the low-temperature behaviour of finite-dimensional systems. Our models use a description in terms of small deviations of particle coordinates from a set of reference positions, part…
Ein löchriger Wirt: Die Oberton(SHG)-Intensität des Pulvers eines octupolaren porösen metall-organischen Gerüsts mit einer Td-symmetrischen Käfigstruktur (siehe Bild; grün: Zentrum der octopolaren Struktur) ist etwa 15-mal höher als diejenige von KH2PO4. Das offene anionische Gerüst ist thermisch sehr stabil, weist ei…
A snowflake-shaped Zn porphyrin dendrimer with a C60 terminal was prepared. Covalent linkage of the C60 unit results in significant quenching of the Zn porphyrin fluorescence mainly due to energy transfer from the Zn porphyrin core to the C60 terminal. Comparison of the energy-transfer efficiency with similar dendrons…
Magnetization and local Co structure of $4\phantom{\rule{0.3em}{0ex}}\mathrm{at.}\phantom{\rule{0.2em}{0ex}}%$ Co-doped ZnO insulating films, prepared by direct current reactive magnetron cosputtering, have been studied as a function of substrates. Although all the Co:ZnO films possess a common feature that ${\mathrm{…
Theoretical study on the structure and electronic properties of small AgmNip (m + p < or = 6) clusters has been carried out in the framework of density functional theory. Structural features, cohesive energies, vertical ionization potentials, and charge transfers are evaluated for each Ag/Ni ratio. In all the AgmNip c…
An external mechanical torque on colloids immersed in a nematic liquid crystal can induce a Coulomb-like $1∕r$ interaction between them [Lev and Tomchuk, Phys. Rev. E 59, 591 (1999); Lev et al., ibid. 65, 021709 (2002)]. In this paper we show that the director-mediated Coulomb-like interaction of two colloids is deter…
Mehr als eine hübsche Struktur: Wasserdispergierbare Hybrid-Nanoröhren wurden als desymmetrisierendes Agens zur Erzeugung von Janus-Nanopartikeln bestehend aus einem hydrophoben sphärischen Kern mit einseitig angebrachten, wasserlöslichen Polymerketten genutzt (siehe Schema). Die Janus-Micellen selbstorganisieren zu S…
We describe the spontaneous photoinduced patterning of azo-dye polymer films. We have observed that the illumination of an azo-dye polymer film by a uniform single laser beam with normal incidence leads to a self-structurization process that results in the formation of well-ordered submicrometer-sized structures whose…
We have studied the electronic structure of the Ni triangular lattice in NiGa(2)S(4) using photoemission spectroscopy and subsequent model calculations. The cluster-model analysis of the Ni 2p core-level spectrum shows that the S 3p to Ni 3d charge-transfer energy is approximately -1 eV and the ground state is dominat…
Electron paramagnetic resonance (EPR) investigations were carried out on hybrid core−shell nanocomposites based on silicon carbide nanoparticles (SiC) and polyaniline (PANI) doped with camphor sulfonic acid (CSA). Charge carrier concentrations and thermal activations in low and high conducting polymers arranged as thi…
We use density functional theory to study the capillary phase behaviour of a discotic system of colloidal platelets that are confined in a planar slit pore. The model plates have circular shape, continuous orientations and vanishing thickness; they interact via hard-core repulsion with each other and with the walls wh…
Schon in niedrigen Konzentrationen wirkt der im Schema gezeigte Pinzettenkomplex bei einer Reihe organischer Lösungsmittel als Gelbildner. π-Stapelung der Heteroaren-Einheiten, Van-der-Waals-Wechselwirkungen zwischen den langkettigen Alkylgruppen und Metall-Metall-Wechselwirkungen sind an der Aggregation beteiligt. De…
The universal stress protein (Usp) superfamily encompasses a conserved group of proteins involved in stress resistance, adaptation to energy deficiency, cell motility and adhesion, and is found in all kingdoms of life. The paradigm usp gene, uspA, of Escherichia coli is transcriptionally activated by a large variety o…
The mesoscopic inhomogeneity of conducting polymer films obtained by electropolymerization and spin-coating was studied using Kelvin probe force microscopy (KFM) and current-sensing atomic-force microscopy (CS-AFM). A well-pronounced correlation was established between the polymer morphology, on the one hand, and its…
Eines der größten Polywolframate, das 20 Cer(III)-Atome enthaltende Wolframatogermanat [Ce20Ge10W100O376(OH)4(H2O)30]56− (1), wurde durch Reaktion von CeIII-Ionen mit der trilakunaren polyanionischen Vorstufe [α-GeW9O34]10− in wässriger Lösung synthetisiert. Das Polyanion 1 ist das erste Lanthanoid-substituierte Wolfr…