Materials Literature
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We demonstrate that carbon nanotori constructed by either coalescing C 60 molecules along the 5-fold axis (incorporating pentagons and octagons) or by joining the ends of Haeckelite tubes (containing heptagons, hexagons, and pentagons) exhibit large magnetic moments when an external magnetic field is applied. In parti…
Distribution of the probability current and the probability density of wave packets was calculated for nanotubes and nanotube Y junctions by solving the three dimensional time-dependent Schr\"odinger equation for a jellium potential model of the scanning tunneling microscope (STM) tip-nanotube-support system. Four sys…
The reaction between [Pd(2)(dba)(3)] (dba = dibenzylideneacetone), tributylphosphine, and a bis(cycloalkeno)-1,4-diselenin leads to either a mononuclear diselenolene [Pd[SeC(R(1))=C(R(2))Se](PBu(3))(2)] or a dinuclear diselenolene [Pd(2)[SeC(R(1))=C(R(2))Se](2)(PBu(3))(2)] [R(1), R(2) = (CH(2))(n), n = 4, 5, 6] depend…
Models of photogeneration of charge carriers and structural regularities of the photoeffect are analyzed for homologous series of the main classes of photosensitive polymer semiconductors and their donor-acceptor complexes with different sensitizers. The relationship between the chemical structure of polymers and thei…
Frustration verstehen: Eine gezielte Beeinflussung der Struktur durch die Wahl des Templats machte neunkernige Metallräder mit {Cr8Ni}- oder {Cr7(VO)2}-Kernen zugänglich. Magnetismusstudien (siehe Bild) an einem dieser Räder ergaben ein Verhalten als magnetisches Möbius-Band. Diese ersten detaillierten Magnetismusstud…
Trockene Filme: Durch Elektrospinnen wurden Filme mit großen Wasserkontaktwinkeln (166.7°) und kleinen Gleitwinkeln (4.3°) hergestellt. Diese Filme zeigen eine ausgezeichnete superhydrophobe Cassie-Bereichs-Stabilität: Im Bild ist ein selbst nach uniaxialer Belastung mit 400 Pa nicht benetzender Wassertropfen zu sehen.
The surface of the textile fabrics is not absolutely flat and smooth. Its geometrical roughness within certain extents is considerable. The surface roughness influences the fabric hand and it plays a significant role in the end use of the fabric. In parallel, the periodic variations of the fabric surface level due to…
1-Aminocyclopropane-1-carboxylate (ACC) deaminase is a pyridoxal 5'-phosphate (PLP) dependent enzyme catalyzing the opening of the cyclopropane ring of ACC to give alpha-ketobutyric acid and ammonia as the products. This ring cleavage reaction is unusual because the substrate, ACC, contains no abstractable alpha-proto…
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…