Materials Literature
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The electronic structure of a monolayer of single-molecule magnets ${\mathrm{Mn}}_{12}$ on a Au(111) surface is studied using spin-polarized density-functional theory. The ${\mathrm{Mn}}_{12}$ molecules are oriented such that the magnetic easy axis is normal to the surface, and the terminating ligands in the ${\mathrm…
We present here magnetization, specific heat and Raman studies on single-crystalline specimens of the first pyrochlore member $Sm_2Ti_2O_7$ of the rare-earth titanate series. Its analogous compound $Sm_2Zr_2O_7$ in the rare-earth zirconate series is also investigated in the polycrystalline form. The Sm spins in $Sm_2T…
We introduce a novel algorithm to perform event-driven simulations of hard rigid bodies of arbitrary shape, that relies on the evaluation of the geometric distance. In the case of a monodisperse system of uniaxial hard ellipsoids,we perform molecular dynamics simulations varying the aspect-ratio X0 and the packing fra…
We present a combined experimental and theoretical study of the effects of pressure on T_c of the hexagonal layered superconductors nH-CaAlSi (n = 1, 5, 6), where nH labels the different stacking variants that were recently discovered. Experimentally, the pressure dependence of T_c has been investigated by measuring t…
We report on the structural and magnetic characterization of (110) and (001) ${\mathrm{La}}_{2∕3}{\mathrm{Ca}}_{1∕3}\mathrm{Mn}{\mathrm{O}}_{3}$ (LCMO) epitaxial thin films simultaneously grown on (110) and $(001)\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}$ substrates, with thicknesses $t$ varying between 8 and $150\phanto…
Conceptual studies and numerical simulations are performed for imaging devices that transform a near-field pattern into magnified far-zone images and are based on high-order spatial transformation in cylindrical domains. A lens translating a near-field pattern from an almost circular input boundary onto a magnified fa…
We have prepared various poly(N-isopropylacrylamide) (PIPAAm)-grafted silica bead surfaces through surface-initiated atom transfer radical polymerization (ATRP) by changing graft densities and brush chain lengths. The prepared surfaces were characterized by chromatographic analysis using the modified silica beads as c…
This is the first paper of a series of three, reporting on numerical simulation studies of geometric and mechanical properties of static assemblies of spherical beads under an isotropic pressure. Frictionless systems assemble in the unique random close packing (RCP) state in the low pressure limit if the compression p…
The changes of defect characteristics induced by accelerated lifetime tests on the heterostructure n-ZnO/i-ZnO/CdS/Cu(In, Ga)(S, Se)$_2$/Mo relevant for photovoltaic energy conversion are investigated. We subject heterojunction and Schottky devices to extended damp heat exposure at 85$^{\circ}$C ambient temperature an…
Abstract Despite the periodical and completely interconnected pore network that characterizes rapid prototyped scaffolds, cell seeding efficiency remains still a critical factor for optimal tissue regeneration. This can be mainly attributed to the current resolution limits in pore size. We present here novel three‐dim…
Abstract Yttrium‐stabilized zirconia (YSZ) and cerium gadolinium oxide (CGO) thin films were prepared by pulsed laser deposition (PLD) under different ambient pressures and substrate temperatures. The microstructures of the obtained films are compared with existing structural zone models for thin‐film growth. The mode…
We examine the electronic ground states of acenes with different numbers of fused benzene rings (up to 40) by using first principles density functional theory. Their properties are compared with those of infinite polyacene. We find that the ground state of acenes that consist of more than seven fused benzene rings is…
Stable superhydrophobic surfaces with water contact angles over 170 degrees and sliding angles below 7 degrees were produced by simply coating a particulate silica sol solution of co-hydrolysed TEOS/fluorinated alkyl silane with NH(3).H(2)O on various substrates, including textile fabrics (e.g. polyester, wool and cot…
It is demonstrated that the doping of alkali metal atoms on fullerene, C60, remarkably enhances the molecular hydrogen adsorption capacity of fullerenes, which is higher than that of conventionally known other fullerene complexes. This effect is observed to be more pronounced for sodium than lithium atom. The formatio…
Abstract Organische Luminophore wurden lange nur in biologischen Markierungsverfahren und bestimmten analytischen Nachweisen angewendet, doch in jüngster Zeit werden auch neuartige organische elektronische Materialien und Farbstoffe für die aufstrebende Nanotechnologie entwickelt. Unter vielen verschiedenartigen Fluor…
Graphene is considered as one of the most promising materials for post silicon electronics, as it combines high electron mobility with atomic thickness [Novoselov et al. Science 2004, 306, 666-669. Novoselov et al. Proc. Natl. Acad. Sci. U.S.A. 2005, 102, 10451-10453]. The possibility of chemical doping and related ex…
The world of organic luminophores has been confined for a long time to fairly standard biological labeling applications and to certain analytical tests. Recently, however, the field has undergone a major change of direction, driven by the dual needs to develop novel organic electronic materials and to fuel the rapidly…
The magnetic phase diagram of single-crystalline Ho 1− x Er x MnO 3 below T N (antiferromagnetic transition temperature) is determined by measuring the magnetic susceptibility (χ), specific heat ( C P ), and dielectric constant (ε). Er doping enhances the P 6 3 c m magnetic phase above T SR (spin-reorientation tempera…
The electrical conduction of Li 2 O–B 2 O 3 , Na 2 O–B 2 O 3 and K 2 O–B 2 O 3 glasses seems, at first sight, to be dominated by the activation energy. Regardless of the size of the alkali ion, there is a unique dependence of conductivity, at a certain temperature, on the alkali–alkali distance and thus on N (the numb…
Thermal expansions (TEs) of dense and porous samples were studied for mixed conductor Sr(Co 0.9 Nb 0.1 )O 3−δ (SCNb). In Ar, the TEs of the porous samples were almost the same as those of a dense sample, which had the character of conventional TEs. In air, on the other hand, the TEs of porous samples were larger than…