Materials Literature
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The results of two sets of experiments to measure the elastic–plastic behaviour of gold at the nanometre length scale are reported. One set of experiments was on free-standing nanoscale single crystals of gold, and the other was on free-standing nanoscale specimens of open-celled nanoporous gold. Both types of specime…
Gradient plasticity theories which are used to describe size effects require nonstandard boundary conditions. We believe that the role of these boundary conditions in combination with a moving elastic–plastic boundary has so far not been well understood. In order to clarify the conditions which are required at such an…
World's record: The first isolation and structural characterization of a homoleptic isocyanidemetalate dianion has been achieved with [Fe(CNXyl)4]2− (Xyl=2,6-dimethylphenyl; see structure, Fe red, N blue, C gray). Spectral and structural data indicate that metal-to-isocyanide back-bonding in this electron-rich species…
To develop a novel layered host material with the ability to encapsulate anionic substances, the intercalation of three cationic polyelectrolytes into synthetic sodium fluortetrasilisic mica (Na-TSM) was investigated. With polyethylenimine (PEI) and poly(allylamine hydrochloride) (PAH), the conformation of the interca…
A new Monte Carlo technique for the simulation of secondary electron (SE) and backscattered electron (BSE) of scanning electron microscopy (SEM) images for an inhomogeneous specimen with a complex geometric structure has been developed. The simulation is based on structure construction modeling with simple geometric s…
Von gleicher Herkunft: Eine neuartige Polymerisationsmethode (Zwillingspolymerisation) liefert organisch-anorganische Nanokomposite ausgehend von einem einzigen Monomer. Zum Beispiel ergibt Tetrafurfuryloxysilan sich durchdringende Netzwerke aus Polyfurfurylalkohol und SiO2 (siehe Bild). Durch Herauslösen der organisc…
This paper studies dislocation induced internal stresses as introduced in a strain gradient crystal plasticity approach. The need for a second-order crystal plasticity approach is motivated in the context of the analysis of free-standing metal films used in radio-frequency micro-electro-mechanical systems (RFMEMS). Th…
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.