Materials Literature
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Using spectroscopic ellipsometry, we study the optical conductivity $\ensuremath{\sigma}(\ensuremath{\omega})$ of insulating $\mathrm{La}\mathrm{Sr}\mathrm{Mn}{\mathrm{O}}_{4}$ in the energy range of $0.75--5.8\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ from $15\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex…
We have developed new, synthetic vector formulations that display high efficiency of gene transfer to vascular cells and tissues. The formulations comprise cationic liposomes and cationic, receptor-targeting peptides that self assemble on mixing with plasmid DNA into receptor-targeted nanocomplexes (RTNs). One such RT…
Formwandler: Form und Größe von Gold-Nanokristallen wurden durch gerichtetes Überwachsen polyedrischer und sphärischer Kristallkeime unterschiedlicher Größen simultan gesteuert. Die erhaltenen Würfel, Kuboktaeder und Oktaeder (siehe SEM-Bilder; Wachstum aus sphärischen Keimen zweierlei Größe) zeigen charakteristische…
Coincidence Doppler broadening of the positron annihilation technique has been employed to identify the defects in thermally annealed 'as-received' ZnO and thermally annealed ball-milled nanocrystalline ZnO. Results indicate that a significant amount of oxygen vacancy has been created in ZnO due to annealing at about…
Multivalent systems are well known for their enhanced ability to bind multivalent counterparts. This contribution addresses the question whether they can also behave as cooperative catalysts. Analyzing examples from our own laboratory we show that self-assembled systems obtained by covering gold nanoclusters with thio…
A sandwich piezoelectric ceramic ultrasonic transducer in thickness vibration is studied. The transducer consists of front and back metal masses, and coaxially segmented, thickness polarized piezoelectric ceramic thin rings. For this kind of sandwich piezoelectric transducers in thickness vibration, it is required tha…
Dinuclear ruthenium complexes containing the stable metal−metal bonded Ru 2 (CO) 4 sawhorse unit with two dendritic carboxylato bridges have been synthesized and characterized. All complexes Ru 2 (CO) 4 (O 2 CR) 2 L 2 (R = R 1, R 2, R 3 ) containing cyanobiphenyl-based poly(arylester) dendrons of first (R 1 ), second…
We report on pulsed-field magnetization, $Q$-band electron spin resonance (ESR), and $^{23}\mathrm{Na}$ NMR measurements of the $S=1∕2$ spin triangle clusters ${\mathrm{Na}}_{9}[{\mathrm{Cu}}_{3}{\mathrm{Na}}_{3}{({\mathrm{H}}_{2}\mathrm{O})}_{9}{(\ensuremath{\alpha}\text{\ensuremath{-}}X{\mathrm{W}}_{9}{\mathrm{O}}_{…
Examination of Grammatophora marina from rough and clonal cultures showed that cell size changes were more flexible than is generally reported for diatoms.Allogamous sexual auxosporulation took place through copulation between small male cells and larger female cells, but only in mixed rough culture and never in clona…
The structural, electronic, and magnetic properties of the ${\mathrm{Mn}}_{0.06}{\mathrm{Ge}}_{0.94}$ diluted magnetic semiconductor, grown at $520\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ by molecular-beam epitaxy on $\mathrm{Ge}(001)2\ifmmode\times\else\texttimes\fi{}1$, have been investigated. Diluted and highly order…
Molecular dynamics simulations have been performed to investigate the reaction behaviour of species that may affect the growth of ultrananocrystalline and nanocrystalline diamond films. We calculated the sticking coefficients of CH x ( x = 0–4), C 2 H x ( x = 0–6), C 3 H x ( x = 0–2) and C 4 H x ( x = 0–2) on diamond…
The marine bacterium Saccharophagus degradans was investigated for the synthesis of polyhydroxyalkanoates (PHAs), using glucose as the sole source of carbon in a two-step batch culture. In the first step the microorganism grew under nutrient balanced conditions; in the second step the cells were cultivated under limit…
We report on anionic ring-opening polymerization (ROP) of racemic beta-(methoxymethyl)-beta-propiolactone (MOMPL) and beta-(ethoxymethyl)-beta-propiolactone (EOMPL) initiated by supramolecular complex of potassium acetate and tetrabutylammonium acetate (Bu4N+ Ac) as well as by tetrabutylammonium hydroxide, respectivel…
The clustering of nanoparticles (NPs) in solutions and polymer melts depends sensitively on the strength and directionality of the NP interactions involved, as well as the molecular geometry and interactions of the dispersing fluids. Since clustering can strongly influence the properties of polymer-NP materials, we ai…
Carbon nanotubes are nanostructures that promise much in the area of constructing nanoscale devices due to their enhanced mechanical, electrical and thermal properties. In this paper, we examine a gigahertz oscillator that comprises a carbon nanotube oscillating in a uniform concentric ring or bundle of carbon nanotub…
A main-chain-type organoboron quinolate polymer was prepared by means of polymer reaction between the precursor polymer and triphenylborane. The precursor polymer was synthesized by the Sonogashira−Hagihara coupling reaction between diyne monomer and tert -butoxycarbonyl- (Boc-) protected dibromoquinolinol monomer. Th…
Phase-contrast transmission electron microscopy (PC-TEM) and quick freezing method have been combined to study the initial growing process of a self-assembled lipid nanotube in water. The PC-TEM enabled us to detect thin lamellar edge structure and the very fast growth of the newborn edge to a thin tube with high cont…
Using first-principles density functional theory based on gradient corrected approach, we have studied interaction of ${\mathrm{H}}_{2}$ molecule with Li-doped carbon nanotube and nanotube based peapod structures. We find that ${\mathrm{H}}_{2}$ physisorbs on pure carbon nanotube, which is in agreement with earlier st…
We have synthesized linear poly(lactic acid) (BHMBA−PLA) possessing a pendent carboxylic acid group via ring-opening polymerization (ROP) of l - or d, l -lactide using bis(hydroxymethyl) butyric acid (BHMBA) as initiator and stannous octoate as catalyst. Polymerizations were typically conducted in the bulk for ∼3 h at…
We present the results of experiments on the optical, electrical and magnetic properties and electronic structure and optical spectrum calculations of the Heusler alloys Fe 2 TiAl, Fe 2 VAl and Fe 2 CrAl. We find that the drastic transformation of the band spectrum, especially near the Fermi level, when replacing the…