Materials Literature
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The bigger the better: Increasing metal size seems to be the determining factor in the formation of an unprecedented series of homoleptic linear pyrazolates of the heavy alkaline-earth metals (Ca, Sr, Ba, see picture, Ba=green, N=blue, C=black), with the formation of trinuclear calcium, tetranuclear strontium, and hex…
With the help of the equations of motion method for the Green's function, the transition properties of ferroelectric thin films are investigated on the basis of the transverse Ising model. By decoupling the Fermi-type Green's functions to a higher order, the results beyond those of the usual mean-field approximation a…
In this study we present results of an investigation into the reactivity of molecularly chemisorbed oxygen species on a Au/TiO2 model catalyst. We have previously shown that a Au/TiO2 model catalyst sample can be populated with both atomically and molecularly chemisorbed oxygen species following exposure to a radio fr…
X-ray absorption spectroscopy is applied to investigate NaAlH 4 doped with 5 mol % TiCl 3 by ball milling. XANES analysis indicates that after the ball milling Ti species are reduced from Ti (+3) to Ti (0). Release or absorption of hydrogen does not affect the chemical state obtained after ball milling. EXAFS analysis…
We substitute $\mathrm{Mg}$ for $\mathrm{Mn}$ in the ${\mathrm{LaMnO}}_{3}$ compound. ${\mathrm{LaMn}}_{1\ensuremath{-}x}{\mathrm{Mg}}_{x}{\mathrm{O}}_{3}$ single phases can be formed up to $x=0.5$. Structural and electronic properties were studied by means of x-ray diffraction and x-ray absorption spectroscopy. A dou…
CeO 2 nanostructured thin films have been deposited on Al 2 O 3 (1−102) and TiO 2 (001) single-crystal substrates through metal−organic chemical vapor deposition (MOCVD) using the Ce(III) 1,1,1,5,5,5-hexafluoro-2,4-pentanedionato diglyme adduct (Ce(hfa) 3 ·diglyme). Structural and morphological characterizations have…
Hair raising! Poly(methyl methacrylate) chains grown on a dendronized polymer (denpol) having repeat units with terminal 2-bromoisobutyramide groups produce a hairy surface. When adsorbed on mica, MoS2, and highly oriented pyrolytic graphite, the hairy denpol molecules have a quasi two dimensional backbone conformatio…
One-dimensional supramolecular assembly of dendrimers (see picture) has been achieved by multiple weak interactions between highly branched molecules with irregular structures. This finding contradicts the widely accepted assumption that precise matching of directional interactions and steric constraints is required t…
The effect of a crystal's growth rate history on the current growth behavior was investigated as a cause of crystal growth rate dispersion (GRD), which is a significant problem in crystallizer design and modeling. The solute used in the experiments was sucrose, a high production commodity still crystallized mainly in…
We perform inelastic neutron scattering measurements on the molecular nanomagnet ${\mathrm{Mn}}_{12}$-acetate to measure the excitation spectrum up to $45\phantom{\rule{0.3em}{0ex}}\mathrm{meV}$ $(500\phantom{\rule{0.3em}{0ex}}\mathrm{K})$. We isolate magnetic excitations in two groups at $5--6.5\phantom{\rule{0.3em}{…
Biodegradable PEGylated Gd-DTPA l-cystine copolymers, PEG-g-poly(GdDTPA-co-l-cystine), were prepared and tested as a blood pool contrast agent in mice. The biodegradable macromolecular agent was designed to be broken down into smaller Gd complexes by endogenous thiols via the disulfide-thiol exchange reaction to facil…
Top banana! Hydrogen-bonded bent complexes of benzoic acids (H donor) and nonmesomorphic V-shaped 4′-stilbazoles (H acceptor) give rise to polar smectic C (SmCP, see graphic) mesophases. The multifunctional character of these noncovalent materials is confirmed through their electrooptical, dielectric, and luminescent…
We analyze spin transitions in molecular crystals with the help of Landau theory. Experimental observations show that a pure spin transition may be described as an isostructural transition with a totally symmetric order parameter. For long-range ordering of different spin states, a model is developed in which the spin…
Abstract Polyanilines soluble in an aqueous basic medium were synthesised by copolymerization of aniline (ANI) with both 2 and 3‐aminobenzoic acids (ABA). Different composition copolymers were prepared by varying the ANI/ABA feed ratio. Poly(aniline‐ co ‐2‐aminobenzoic acid) (PANI2ABA) and poly(aniline‐ co ‐3‐aminoben…
Herein we demonstrate the successful photochemical generation of nitric oxide via two-photon excitation (TPE) from the supramolecular complex PPIX-RSE ({mu-S,mu-S'-protoporphyrin-IX-bis(2-thioethyl)diester]tetranitrosyl-diiron). The TPE fluorescence spectra indicate efficient energy transfer from the PPIX antennae to…
A simple easy to follow statistical approach has been proposed for developing body size charts from anthropometric data. It has been possible to cover 95 percent of the population using 11 size charts. Multivariate analysis was carried out to detect relationships between variables. Principal component analysis was car…
Die Flüssigphasensynthese von einkristallinen ZnO-Scheiben und -Ringen (siehe Bild) in hohen Ausbeuten gelingt mit anionischen Tensiden als Templaten bei nur 70–90 °C. Über die Wachstumstemperatur und das molare Verhältnis der Reagentien lässt sich die Reaktion so steuern, dass Scheiben oder Ringe bevorzugt erhalten w…
Understanding frustration: The control of structure through the choice of the template has allowed the synthesis of nona-nuclear metal wheels that contain {Cr8Ni} or {Cr7(VO)2} cores. Magnetic studies (see picture) of one of these wheels shows that it behaves as a magnetic Möbius strip. These are the first detailed ma…
All change: Three different output signals, chromic, nonlinear optical, and magnetic, can be altered simultaneously with the molecular switch based on radical 1. The electrochemical reduction and oxidation of 1 is completely reversible. These redox cycles can be repeated several times, and the corresponding changes in…
The scaling of the bond-bond correlation function ${P}_{1}(s)$ along linear polymer chains is investigated with respect to the curvilinear distance $s$ along the flexible chain and the monomer density $\ensuremath{\rho}$ via Monte Carlo and molecular dynamics simulations. Surprisingly, the correlations in dense three-…