Materials Literature
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Rational outer-sphere design can be used to optimize heterogeneous catalysts. Thus, imprinting of bulk silica was used to prepare tethered active sites with hydrophilic (1) and hydrophobic environments (2). In the Knoevenagel condensation of isophthalaldehyde with malonitrile, for example, 1 gave rate enhancements of…
Abstract Exposures were conducted of iron, nickel, ferritic 1‐18%Cr steels, austenitic 18%Cr‐9%Ni‐ and 20%Cr‐31%Ni‐steels and a 16%Cr‐Ni‐base alloy at 500°C in He‐30%H 2 O and 70%H 2 O‐30%NH 3 , to compare the corrosion behaviour of these materials in water vapor as in conventional power plants with their behaviour in…
Rationales Design der äußeren Oberfläche kann zur Optimierung von heterogenen Katalysatoren genutzt werden. Durch molekulares Prägen von Siliciumdioxid wurden so aktive Stellen mit hydrophilen (1) und hydrophoben Umgebungen (2) erzeugt. Die Knoevenagel-Kondensation von Isophthalaldehyd mit Malonitril verlief mit 1 etw…
Abstract Wie Graphit sind Nanopartikel aus anorganischen Verbindungen mit zweidimensionaler lamellarer Struktur wie MoS 2 gegen Faltung instabil und können daher Nanoröhren und Fulleren‐artige Strukturen, auch anorganische Fullerene oder IFs genannt, liefern. Für solche Nanomaterialien wurde eine Reihe von Anwendungen…
Anionic meso -tetrakis(4-sulfonatophenyl)porphine (TSPP) interacts with poly(amido) amine (PAMAM) dendrimers of generations 2.0 and 4.0 in aqueous solution to form several dendrimer-associated species, which depend on the relative concentrations of dendrimer to porphyrin (D/P ≡ [PAMAM]/[TSPP]). At D/P ratios above the…
The photophysical properties of acetonitrile solutions of [Ru(bpy)(3)](2+) and [S(2)Mo(18)O(62)](4-) are described. We discuss evidence for ion cluster formation in solution and the observation that despite the strong donor ability of the excited state of [Ru(bpy)(3)](2+) and its inherent photolability, adducts with […
Abstract The thermodynamic equilibrium between metallic iron, iron oxides, iron carbides and an hydrocarbon/hydrogen mixture was calculated at 600°C. On the basis of the metastable Fe‐C‐O phase diagram, both metallic iron and iron oxides can be directly converted into carbides in reducing and carburizing atmosphere. T…
The formation of large-sized, well-oriented microdomains of poly( l -lactide)- b -poly(ε-caprolactone) (PLLA−PCL) was successfully achieved by using different crystalline substrates including benzoic acid (BA) and hexamethylbenzene (HMB), whereas spherulitic crystalline texture was obtained on amorphous substrates. Cr…
Ferromagnetic properties have been observed in CuO doped with 3.5–15 at. % of Mn. The transition from ferromagnetic to paramagnetic phase at TC=80 K is associated with the metal–insulator transition. Magnetoresistance is weakly negative in the vicinity of the transition, but positive in a wide range of temperatures be…
The synthesis of a poly(ethylene glycol) (PEG)-grafted surface-reactive random copolymer and its self-assembled structure on Si/SiO 2 substrates for construction of nonbiofouling surfaces are reported. The copolymer, poly(TMSMA-r-PEGMA), which is comprised of an “anchor part” (trimethoxysilane) and a “function part” (…
Diatom shells (see picture of cell of Stephanopyxis turris) contain long-chain polyamines attached either to putrescine or to phosphorylated silaffin peptides. These polyamines direct the in vitro formation of silica nanospheres from silicic acid. The concentration of multivalent anions (such as phosphate) defines the…
The physical properties of magnetic nanoparticles have been investigated with focus on the influence of dipolar interparticle interaction. For weakly coupled nanoparticles, thermodynamic perturbation theory is employed to derive analytical expressions for the linear equilibrium susceptibility, the zero-field specific…
We have re-refined the X-ray structure of the heme site in cytochrome c553, supplementing the crystallographic data with quantum chemical geometry optimizations, instead of the molecular mechanics force field used in standard crystallographic refinement. By comparing the resulting structure, obtained using medium-reso…
In this paper we explore the transmission properties of single subwavelength apertures perforated in thin metallic films flanked by asymmetric configurations of periodic arrays of indentations. It is shown how the corrugation in the input side can be used to transmit selectively only two different wavelengths. Also, b…
We perform ab initio calculations, based on density functional theory, of substitutional and vacancy defects in the monoclinic hafnium oxide (m-HfO2) and alpha-quartz (SiO2). The neutral oxygen vacancies and substitutional Si and Hf defects in HfO2 and SiO2, respectively, are investigated. Our calculations show that,…
Mie resonances due to scattering/absorption of light in InN containing clusters of metallic In may have been erroneously interpreted as the infrared band gap absorption in tens of papers. Here we show by direct thermally detected optical absorption measurements that the true band gap of InN is markedly wider than curr…
Reversing the magnetization of a ferromagnet by spin transfer from a current, rather than by applying a magnetic field, is the central idea of an extensive current research. After a review of our experiments of current-induced magnetization reversal in Co/Cu/Co trilayered pillars, we present the model we have worked o…
In this paper we report the determination of oxygen diffusion coefficient for optimally doped manganite thin films of La0.85Na0.15MnO3 (LNMO). The study was performed by means of isothermal conductivity measurements on two different epitaxially oriented thin films grown on SrTiO3 (100) and SrTiO3 (110). The values fou…
Coalescence of initially produced nanospheres inside 3D super-lattices may be the reason for the formation of ferromagnetic cobalt nanorods, monodisperse in length and diameter, from [Co(η3-C8H13)(η4-C8H12)] in the presence of stearic acid and hexadecylamine. The self-organization of these nanorods into unprecedented…
In analogy to graphite, nanoparticles of inorganic compounds with lamellar two-dimensional structure, such as MoS(2), are not stable against folding, and can adopt nanotubular and fullerene-like structures, nicknamed inorganic fullerenes or IF. Various applications for such nanomaterials were proposed. For instance, I…