Materials Literature
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The ferromagnetic intermetallic compound Mn2Ga5 has been synthesized and characterized by single-crystal X-ray diffraction study and by magnetic property measurements. The compound, with the Mn2Hg5-type structure, exhibits a saturated magnetic moment of 2.71 muB per formula unit with T(C) approximately = 450 K. The el…
Abstract BACKGROUND: Reactive melt blends of poly(trimethylene terephthalate) (PTT) with a phenoxy resin (Ph) are some of the most interesting classes of reactive blends in which different kinds of exchange reactions can occur. This work is devoted to the study of these reactions and their effect on the rheological an…
This article is focused on the preparation of barium titanate nanopowder/epoxy composites and studying the effect of barium titanate nanopowder on improving mechanical and thermal characteristics of the epoxy polymer. Composites are prepared by dispersing barium titanate nanopowder in epoxy resin and, subsequently, cr…
Abstract The synthesis of carbon nanotubes (CNTs) on a cobalt‐iron (Co‐Fe) catalyst supported on a calcium carbonate (CaCO 3 ) substrate, contained within a fluidized bed was investigated for the first time. CaCO 3 supported catalysts, prepared using traditional wet impregnation techniques result in a soft and sticky…
Dipeptides with two hydrophobic residues are known to often form crystals with hydrophobic or hydrophilic channels. One of the exceptions is Leu-Ile, which has been previously shown to crystallize as a nonporous 0.75 hydrate in the hexagonal space group P6(1) with Z' = 4. We have now found that in the presence of D-Le…
Calculations and measurements of the Xe 5s and 5p nondipole photoelectron asymmetry parameters are obtained, which present clear evidence of the existence of quadrupole Cooper minima, i.e., minima in quadrupole matrix elements as a function of energy, in the photoionization process. This verifies earlier predictions o…
The high-pressure structural behavior of the binary intermetallic compounds CoSn, FeSn, and NiIn with the peculiar void containing CoSn (B35)-type structure has been studied by means of room-temperature diamond anvil cell and high-temperature multianvil experiments, as well as by first-principles calculations. All thr…
Abstract An iron‐containing mesoporous molecular sieve, or Fe‐MCM‐41, was successfully synthesized the via sol–gel technique using silatrane and FeCl 3 as the silicon and iron sources, and was characterized using various techniques. Many factors were investigated, namely, reaction temperature and time, calcination rat…
In situ neutron powder diffraction experiments have been performed on samples of SrMnO y, La 0.1 Sr 0.9 MnO y, and La 0.2 Sr 0.8 MnO y (2.5 ≤ y ≤ 3) to determine the existence of oxygen-vacancy ordering and study order–disorder transformations in the La x Sr 1− x MnO y system. The vacancy ordered monoclinic Sr 7 Mn 7…
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…