Materials Literature
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A theoretical investigation of the structure, magnetism and thermal conductivity of LaMn 1− x Ga x O 3 has been made. A local, cluster model is introduced. It is proposed that gallium substitution may cause neighbouring Mn 3+ (3 x 2 − r 2 )/(3 y 2 − r 2 ) orbitals to transform into the 3 z 2 − r 2 state. This unique i…
Ringing the changes: Complexes of azamacrocycles were used for the template synthesis of extraordinary new cyclic and acyclic chromium–nickel chains, which include the “S”-shaped cluster shown (see picture) obtained when a cyclen-based template is used. The results suggest a new method for making sophisticated polymet…
Magnetic-field-induced reorientation of nematic liquid crystals on polymer layers is studied near the glass transition temperature of the polymer. Kinetic curves for different field strengths and temperatures are presented. A model is developed which takes into account the structural rearrangements in the polymer indu…
This Minireview considers the key factors that govern the organization of macroscopic polarization in nonlinear optical systems obtained by electric poling of organic dipolar chromophores dissolved in polymer matrices. The macroscopic electric polarization depends on the thermodynamic state of the dipole system. The d…
The glass transition, a relaxation phenomenon, sets the low temperature limit to the liquid state. Glassy water that forms only under extreme quenching conditions is unstable against crystallization. Opinions differ on whether the glass transition can be observed at all. Here we measure the dielectric $\mathrm{tan}\e…
Large charge disproportionation has been confirmed in the metallic state of a $1/4$-filled organic conductor $\ensuremath{\theta}\mathrm{\text{\ensuremath{-}}}(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\mathrm{\text{\ensuremath{-}}}\mathrm{T}\mathrm{T}\mathrm{F}{)}_{2}\mathrm{R}\mathrm{b}\mathrm{Z}\mathrm{n}(\mathrm{S}\…
Manganese magnets: Trimethylammonio groups appended to the surface of a Mn12 single-molecule magnet lead to a highly charged magnetic cluster that behaves as an electron reservoir. This cluster spontaneously forms its two-electron reduced species which has a ground spin state S=11. The cluster is a precursor for the s…
Freigelegt! Mit einer templatgestützten Elektroabscheidung gelang die Synthese stabiler Netzwerke aus Metall- oder Halbleiternanodrähten (siehe Schema). Dazu wurde a) mesoporöses Siliciumdioxid an einer Elektrode abgeschieden, b) die Kanäle mit dem Metall oder Halbleiter gefüllt und c) das Templat entfernt, um das Nan…
Abstract Chemisorption of the oxygen molecule on the (100) surface of γ‐uranium was investigated using the generalized gradient approximation to Density Functional Theory. Dissociative adsorptions of O 2 are found to be significantly favored compared to molecular adsorptions. Interstitial adsorptions of molecular oxyg…
The synthesis of a novel water-soluble hyperbranched polyurethane is described. The synthetic strategy involves a new approach to hyperbranched polymerization through the selective activation of the A functionality of the unprotected of AB 2 monomer. 1,1‘-Carbonyl diimidazole is added at room temperature to an amino-d…
We demonstrate here the single-atom migration of Tb, Gd, or Ce metal from cage to cage through an intentionally induced atomic path within a carbon nanopeapod. The atomic path is actually an atomic defect (vacancy) induced at the fullerene cage during TEM observation. It is therefore proved that the atomic cage can be…
Two- and three-dimensional Au nanoparticle/[tetrakis( N -methylpyridyl)porphyrinato]cobalt (CoTMPyP) nanostructured materials were prepared by “bottom-up” self-assembly. The electrocatalytic and plasmonic properties of the Au nanoparticle/CoTMPyP self-assembled nanostructured materials (abbreviated as Au/CoTMPyP SANMs…
We employ a theoretical model to calculate mechanical characteristics of macroscopic mats and fibers of single-walled carbon nanotubes. We further investigate irradiation-induced covalent bonds between nanotubes and their effects on the tensile strength of nanotube mats and fibers. We show that the stiffness and stren…
Coronene is a highly symmetric organic molecule whose molecular structure resembles a fragment of graphite. We have crystallized a charge-transfer complex based on coronene and TCNQ, and present crystal structure and transport properties. The complex adopts alternate stacking between coronene and TCNQ, and the charge-…
Spectroscopic properties of ${\mathrm{Eu}}^{3+}$ ions $(<0.1\phantom{\rule{0.3em}{0ex}}\mathrm{at}\phantom{\rule{0.2em}{0ex}}%)$ at two main sites of BaFCl microcrystals are investigated. For ${\mathrm{Eu}}^{3+}$ ions at site I the energy levels and luminescence intensity distribution are similar to most other norm…
The crystal and magnetic structures of the $(\mathrm{La}A)\mathrm{Co}\mathrm{Nb}{\mathrm{O}}_{6}$ ($A=\mathrm{Ca}$, Sr, and Ba) double perovskites have been investigated. The $A=\mathrm{Ca}$ and Sr compounds crystallize with a monoclinic $P{2}_{1}∕n$ superstructure while the larger $A=\mathrm{Ba}$ gives a tetragonal $…
We have studied vacuum ultraviolet (VUV)-induced damage processes in BaMgAl 10 O 17:Eu 2+ using a unique accelerated life-testing device. Emission, excitation, and reflectance spectra of doped and undoped samples before and after VUV damage reveal two independent mechanisms of degradation. The observed color shift in…
The dimeric, pentacopper(II) substituted tungstosilicate [Cu(5)(OH)(4)(H(2)O)(2)(A-alpha-SiW(9)O(33))(2)](10-) (1) has been synthesized in good yield using a one-pot procedure by reaction of Cu(2+) ions with the trilacunary precursor salt K(10)[A-alpha-SiW(9)O(34)]. The title polyanion represents the first polyoxotung…
A flow-through-type DNA array fabricated from an ideally ordered anodic porous alumina substrate is reported. Single-stranded probe DNA was affixed to the walls of the sub-micrometer-diameter holes, and fluorescently labelled target DNA was passed through the holes in the substrate. Fluorescence microscopy revealed an…
High energy $(67\phantom{\rule{0.3em}{0ex}}\mathrm{keV})$ x-ray diffuse scattering measurements were performed on single crystals of $\mathrm{Pb}({\mathrm{Zn}}_{1∕3}{\mathrm{Nb}}_{2∕3}){\mathrm{O}}_{3}\text{\ensuremath{-}}x\mathrm{Pb}\mathrm{Ti}{\mathrm{O}}_{3}$ $(\mathrm{PZN}\text{\ensuremath{-}}x\mathrm{PT})$, to ma…