Materials Literature
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OBJECTIVE: The aim of this study was to evaluate the characteristics of an ultrasmall superparamagnetic iron oxides (USPIO) agent in patients with brain tumors and to correlate changes on MRI with histopathologic data collected systematically in all patients. SUBJECTS AND METHODS: Nine patients with brain tumors were…
Abstract A new discrete supramolecular pseudo‐helicate has been obtained from a saturated heterotopic methylbipyrazyl–methylbipyridyl ligand strand and NiCl 2 . The X‐ray structure of the dinuclear complex shows the 2‐oxapropylene bridge oxygen atoms are engaged in coordination to the octahedral metal centre and a sel…
This paper describes a technique for measuring the sheet resistance of thin metallic films at both 130 GHz and dc (0 Hz). The high-frequency measurements were made using dielectric waveguides, and the conventional four-point probe was used for the lower frequency. The two values of the sheet resistance for each sample…
We report the direct observation, using freeze-fracture transmission electron microscopy, of topological melting in a lyotropic system in the vicinity of a smectic-cholesteric (N*) phase transition. The proliferation of dislocations leads to at least one, and possibly two intermediate phases, characterised by orientat…
Melt processing of poly(L-lactide) (PLLA) and poly(methyl methacrylate) (PMMA) was conducted over a targeted range of compositions with PLLAs of 118 and 316 kDa in molecular mass to identify morphologies and the phase relationships in these blends. These blends are of interest for use in biomaterials and the morpholog…
The thermal decomposition of fluorinated single-walled carbon nanotubes (F-SWNTs), known to result in pristine SWNTs, has been investigated by freezing the gaseous products formed at temperatures between 50 and 500 degrees C under high vacuum in an argon matrix at 10-20 K and analyzing the trapped species by IR spectr…
Various structural possibilities for Al(n)B(m) (n=1-7, m=1-2) neutral isomers were investigated using B3LYP6-311G(d) and CCSD(T)6-311G(d) methods. Our calculations predicted the existence of a number of previously unknown isomers. The B atom favors to locate over/inside of all clusters in this series. All structures o…
In this paper, two sets of electrospun fibers—nylon-6 and montmorillonite (MMT)-reinforced nylon-6—are being investigated for their tensile modulus. Results show that a reduction of fiber diameter close to nano-scale range reveals increasing modulus due to greater alignment of polymeric molecules and increased influen…
Accurate nuclear-density distribution of bismuth oxide solution Bi1.4Yb0.6O3 compound has been studied at 384 °C and at 738 °C by the maximum-entropy method (MEM) and MEM-based pattern fitting combined with the Rietveld method using neutron powder diffraction data. The results reveal that the oxide ions have a complic…
Wade was right: Li2B12C2 and LiB13C2, the first boron-rich boride carbides of lithium, are (nearly) colorless and stoichiometrically composed. Their crystal structures are characterized by B12 icosahedra and C2 and CBC units, respectively, forming a three-dimensional framework with Li cations in the voids. The charge…
We present extensive equilibrium and out-of-equilibrium molecular-dynamics simulations of a liquid of symmetric dumbbell molecules, for constant packing fraction, as a function of temperature and molecular elongation. We compute diffusion constants as well as odd and even orientational correlators. The notations odd a…
The Pt∕BaTiO3 (BTO) interface was investigated by angle-resolved x-ray photoelectron spectroscopy and x-ray reflectivity technique. It was shown that there exists a transition layer of about 9Å at the Pt/BTO interface with electron density lower than that of the BTO film. The transition layer shows a higher binding en…
We report on experiments probing the reactivity of neutral Au(n) clusters, n = 9-68, with carbon monoxide. The gold clusters are produced in a pulsed laser vaporization cluster source, operated at room temperature (RT) or at liquid-nitrogen temperature (LNT), pass through a low-pressure reaction cell containing CO gas…
AAA+ ATPases are ubiquitous proteins that employ the energy obtained from ATP hydrolysis to remodel proteins, DNA, or RNA. The MoxR family of AAA+ proteins is widespread throughout bacteria and archaea but is largely uncharacterized. Limited work with specific members has suggested a potential role as molecular chaper…
Ausgehöhlt: In einer eleganten Methode wandeln Lochfraß- und Ätztechniken einkristalline Pd-Nanowürfel in Nanokästchen (siehe SEM-Bild) und Nanokäfige um, ohne dass exotische Template erforderlich sind. Durch das Leeren der Innenräume der Pd-Nanostrukturen lassen sich Oberflächenplasmonenresonanz-Signale zwischen 410…
9, 16, or 27 [CpFe(μ3-CO)]4 clusters contain the title assemblies (see picture). The one-electron oxidation Fe4→Fe4+ of all Fe4 units appears as a single reversible cyclic voltammetry wave and was used in solution and with dendrimer-modified electrodes for oxo-anion recognition. ATP2− is selectively recognized and bet…
We present a recently developed ab initio method based on many-body perturbation theory to calculate the optical absorption spectrum of one-dimensional systems with helical symmetry. Our scheme involves a local, symmetrized basis set which allows for the calculation of large systems otherwise prohibitive in the standa…
Cerium oxide/montmorillonite layered silicate powder nanocomposites were synthesized electrochemically. The produced nanocomposites were characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy and Raman spectroscopy. X-Ray diffraction shows the nanocomposites retain the face-centered cubic s…
The coordination ability of the electroactive TTF-based chelating ligand 5,5'-bis(4,5-bis(thiomethyl)-4'-carbamoyltetrathiafulvalene)-2,2'-bipyridine (L) has been tested with Cu(I) and Cu(II) centres. [(L)2Cu(I)](PF6), [(L)2Cu(II)](OTf)2 and [(L)Cu(II)(DMF)3](OTf)2 have been synthesized. A single-crystal X-ray analysi…
The fabrication of thermopiles suitable for thermoelectric cooling and energy generation using Bi 2 Te 3 and Sb 2 Te 3 as n- and p-type layers, respectively, is reported. The thin-film thermoelectric material deposition process , thin-film electronic characterization and device simulation is addressed. The thermoelect…