Materials Literature
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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…
Abstract Expandierte Porphyrine sind synthetische Analoga der Porphyrine und unterscheiden sich von diesen und anderen natürlichen makrocyclischen Tetrapyrrolen durch einen größeren zentralen Ring mit mindestens 17 Atomen, wobei die ausgedehnte Konjugation erhalten bleibt, die die biologischen Pigmente kennzeichnet. D…
A hexapeptide motif, RKLPDA, that recognizes the surface of titanium was identified from a peptide phage selection. Mutational analyses showed electrostatic interaction was a major factor in the binding, paving a new way to modify the surface of Ti with active biomolecules.
We demonstrate that efficient shape control may be achieved in the shell of colloidally grown semiconductor nanocrystals (independent of the core), allowing the combination of a 0-D spherical CdSe core with a 1-D rodlike CdS shell. Besides exhibiting linearly polarized emission with a room-temperature quantum efficien…
Expanded porphyrins are synthetic analogues of the porphyrins, and differ from these and other naturally occurring tetrapyrrolic macrocycles by containing a larger central core with a minimum of 17 atoms, while retaining the extended conjugation features that are a hallmark of these quintessential biological pigments.…
ABSTRACT The magnetic‐induction field in the vicinity of an elliptical inclusion embedded in an infinite soft ferromagnetic medium is determined based on complex potential theory. By using a constitutive relation of magnetostriction for isotropic materials, the stress field in the vicinity of an elliptical flaw is obt…
Poly(pyridobisimidazole), PIPD, is known to be the strongest fiber. X-ray crystal structure analysis was carried out by using the imaging plate, on the basis of the neutron structure analysis ( Macromolecules 2002, 35, 3942). Two molecular chains, which are slightly deviated from the planar structure, pass through a m…
Metalated O-silyl cyanohydrins of beta-silyl-alpha,beta-epoxyaldehyde have been found to serve as functionalized homoenolate equivalents by a tandem sequence involving base-promoted ring opening of the epoxide, Brook rearrangement, and alkylation of the resulting allylic anion. On the basis of mechanistic studies invo…
This article describes simultaneous rheological and small-angle X-ray scattering (SAXS) studies of complex fluids, using a modified rheometer that allows in situ synchrotron SAXS measurements. We investigated the behavior under shear stress of lamellar liquid-crystalline suspensions, recently reported, comprised of co…