Materials Literature
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The nonaqueous preparation of nanocrystalline indium and zinc oxide involving the solvothermal reaction of metal acetylacetonates with acetonitrile is presented. The synthesis approach is characterized by a particularly moderate reaction temperature of 100 °C and by the use of an oxygen-free solvent. The oxygen for th…
By using controlled SPM manipulation, carbon nanotubes have been continuously bent into a series of increasing angles, and two distinct buckling modes corresponding to "abrupt" and "gradual" buckle formation were observed through recording the height increment at the bend site during the loading process. Molecular dyn…
Mn2+ has five unpaired d-electrons, a long electronic relaxation time, and labile water exchange, all of which make it an attractive candidate for contrast agent application in medical magnetic resonance imaging. In the quest for stable and nonlabile Mn2+ complexes, we explored a novel dimeric triazacyclononane-based…
Knowledge of the atomic-scale structure is an important prerequisite to understanding and predicting properties of materials. With bulk crystals it is routinely obtained by X-ray diffraction. With nanocrystals, however, traditional X-ray crystallography fails because of their substantially limited length of structural…
Silicon carbide nanostructures were synthesized by carbothermal reduction of carbon−silica (C−SiO 2 ) nanocomposites. C−SiO 2 nanocomposites with C/SiO 2 molar ratios of 1.90−4.21 were used in this study. Thermogravimetric analysis, nitrogen sorption, X-ray diffraction, scanning electron microscopy, transmission elect…
A new family of associating polymers based on four-arm, star-shaped poly(D,L-lactide) (PDLLA) containing peripheral complementary hydrogen-bonding sites is described. Hydroxy-terminated, four-arm, star-shaped PDLLAs of controlled molar mass were functionalized with complementary DNA base pairs, adenine (A) and thymine…
Colored ribbons: The soluble, electron-rich conjugated title polymer (alkyl=dodecyl) with a regiosymmetric structure was synthesized by Grignard metathesis. The polymer displays strong thermochromism in solution. AFM images of spin-coated films show the formation of nanoribbons, and 2D-WAXS analysis reveals 2D order i…
A common source: In a novel twin polymerization, a single monomer is transformed into an organic–inorganic nanocomposite. For example, tetrafurfuryloxysilane polymerizes to form a dense interpenetrating network of poly(furfuryl alcohol) and SiO2 (see picture). Nanoporous silicate, and potentially other metal oxides, c…
Abstract Parts 1 and 2 have shown that the rate of production of bacterial cellulose stagnates because of the limitation of substrate supply and a wall effect, which hinders the removal of the product from the active cell zone. This paper demonstrates, how both of these problems can be eliminated in a novel bioreactor…
Two different condensations of appropriate dipyrromethanes and aldehydes resulted in two structural isomers of metal-free, meso -substituted diferrocenyldipentafluorophenyl porphyrins, one with the ferrocenyl groups in the 5,15 positions, 6, and the other with the ferrocenyl groups in the 5,10 positions, 7 . UV/vis sp…
A recent article by Shi et al. [J. Chem. Phys.123, 174507 (2005)] reports results from mechanical measurements on three simple inorganic glass formers: glycerol, m-toluidine, and sucrose benzoate. The experiments carried out were stress relaxation, aging, and dynamic (all in shear) using a torsional rheometer, an adva…
Abstract The hydrothermal reaction of an aqueous ammonium heptamolybdate solution with cobalt or copper metal salts in the presence of imidazole (imi) or pyrazole (pz) in the temperature range 120–180 °C and at autogenous pressure yields four fully oxidized metal‐complex‐templated octamolybdates, namely [{Cu I (imi) 2…
Photoisomerization studies on a tetranuclear macrocyclic gold(I) alkynyl phosphine complex demonstrate the generation of a dual-input molecular logic with photoswitching behavior that can be controlled by addition or removal of silver(I) ions.
Dislocation and grain-boundary processes contribute significantly to plastic behaviour in polycrystalline metals, but a full understanding of the interaction between these processes and their influence on plastic response has yet to be achieved. The coupled atomistic discrete-dislocation method is used to study edge d…
We present the polarized Raman spectra of $\mathrm{La}\mathrm{Cr}{\mathrm{O}}_{3}$ measured between 5 and $863\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ in several exact scattering configurations. All Raman lines below $600\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{\ensuremath{-}1}$ are assigned to definite phonon modes of…
We present the first study relating structural parameters of precipitate-free Ge0.95Mn0.05 films to magnetization data. Nanometer-sized clusters--areas with increased Mn content on substitutional lattice sites compared to the host matrix--are detected in transmission electron microscopy analysis. The films show no ove…
The crystal structure of the αI-phase of quinacridone was determined from non-indexed X-ray powder data by means of crystal structure prediction and subsequent Rietveld refinement. This αI-phase is another polymorph than the α-phase reported by Lincke [G. Lincke and H.-U. Finzel, Cryst. Res. Technol. 1996, 31, 441–452…
The structural properties of three compositions of phosphosilicate glasses are investigated by means of molecular dynamics computer simulations using a new potential model incorporating polarization effects. Structural features of the three compositions are compared in order to highlight the effect of the composition…
We have investigated random submonolayer films of 3d transition metals on W(001). The tight-binding linear muffin-tin orbital method combined with the coherent potential approximation was employed to calculate the electronic structure of the films. We have estimated local magnetic moments and the stability of differen…
A quinary (La0.5Ce0.5)65Al10(Co0.6Cu0.4)25 alloy with superior glass-forming ability (GFA), identified by the formation of fully glassy rod of 32 mm in diameter by tilt-pour casting, was reported. By comparing with the GFA of quarternary (La0.5Ce0.5)65Al10TM25 and ternary Ln65Al10TM25 alloys (Ln = La or Ce; TM = Co or…