Materials Literature
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Ag 10 Te 4 Br 3 is the first representative of an M(group 11) (poly)chalcogenide halide with covalently bonded [Te 2 ] 2 - units and isolated Te 2 - ions. It represents a new class of materials located between M(group 11) chalcogen halides, characterized by covalently bonded chalcogen structure motives, on the one han…
We report on the growth and multiferroic properties of epitaxial BiCrO3 thin films. Single phase epitaxial thin films were grown on LaAlO3 (001), SrTiO3 (001), and NdGaO3 (110) substrates by pulsed laser deposition. The films display weak ferromagnetism with the Curie temperature of 120K. Piezoelectric response and tu…
Modulated differential scanning calorimetry has been used to quantify the glass transitions of small adsorbed amounts of poly(methyl methacrylate) (PMMA) on silica. While a relatively narrow, single glass transition was found for bulk PMMA, broader two-component transitions were found for the adsorbed polymer. A two-s…
The current-voltage characteristics of layered organic crystals $\ensuremath{\theta}\mathrm{\text{\ensuremath{-}}}(\mathrm{BEDT}\mathrm{\text{\ensuremath{-}}}\mathrm{TTF}{)}_{2}M\mathrm{Zn}(\mathrm{SCN}{)}_{4}$ ($M=\mathrm{Cs},\mathrm{Rb}$) follow the power law with a large exponent (e.g., 8.4 at 0.29 K for $M=\mathrm…
P-doped ZnO films were deposited on n-Si substrate by radio-frequency magnetron sputtering. Hall measurements revealed that the films annealed in situ at 750°C in an oxygen ambient at a pressure of 1.3×10−3–3.9×10−3Pa showed p-type behavior with a hole concentration of 2.7×1016–2.2×1017cm−3, a mobility of 4–13cm2∕Vs,…
Abstract For the production of uniaxially oriented nanofibers and a three‐dimensional, biodegradable scaffold consisting of nanosized fibers, an electrospinning process was modified with a cylindrical auxiliary electrode that was connected to a spinning nozzle to stabilize the initially spun solution and a parallel‐pl…
Hydrogen bonding represents a versatile and convenient route to chemical diversity in natural and synthetic systems. It can be used to join various chemical species to one another to form products ranging from simple dimers to complex supramolecular moieties, some of which may be self-ordering.1,2 The use of hydrogen…
Ferroelectric materials such as lithium niobate and lithium tantalate show a non-linear hysteresis behaviour, which may be explained by dynamical system analysis. The behaviour of these ferroelectrics is usually explained by domains and domain wall movements. So, the spatial variation of the domain wall was studied pr…
Multi-walled carbon nanotubes were synthesized by chemical vapor deposition from pure toluene and toluene/diazine mixtures using ferrocene as a catalyst precursor at 760 degrees C. As recently announced, characterization of the resulting nanotube films showed that, unlike pure carbon nanotubes, those grown in the pres…
Optical control of the coherent breathing vibrations of silver nanospheres is demonstrated using a high-sensitivity femtosecond pump-probe technique in a double-pump pulse configuration. Oscillation of the fundamental mode that usually dominates the time-domain vibrational response can thus be stopped, permitting obse…
The magnetism of Fe and its alloys has been at the center of scientific and technological interest for decades. Along with the ferromagnetic nature of body-centered cubic Fe, the magnetic properties of face-centered cubic (fcc) Fe have attracted much attention. It is well known that fcc Fe is thermodynamically unstabl…
▪ Abstract This paper reviews recent in situ studies of ferroelectric thin films using synchrotron X-ray scattering, with an emphasis on single-crystal perovskite films. We describe observations of thin film growth, the ferroelectric phase transition, and structural evolution during ferroelectric switching. The import…
Injectable multiphasic polymer/ceramic composites are attractive as bioresorbable scaffolds for bone regeneration because they can be cross-linked in situ and are osteoconductive. The injectability of the composite depends on the nanoparticle content and the energetic interactions at the polymer/particle interface. Th…
Absorption and emission properties and fluorescence lifetimes for the [Formula: see text] transition of Nd(3+) ions embedded in P(2)O(5)-K(2)O-MgO-Al(2)O(3) (PKMA)-based glasses modified with AlF(3) and BaF(2) are reported at room temperature. The observed energy levels of Nd(3+) ions in these glasses have been analys…
The atomic structure of anisotropic titanium dioxide nanoparticles is characterized by HRTEM to identify coordination defects at the tip surfaces of the nanorods (see figure). At the tip regions of the nanoparticles, the titanium metal–metal atom spacings extend between the (001) planes and demonstrate site-specific c…
In this paper, we report the first systematic theoretical study of gold-coated iron nanoclusters, aiming at understanding the magnetic properties of this core-shell structure used in biomedical applications. The calculations based on density-functional theory focus on the effect of gold coating on the magnetic and str…
New "Pt-in-CeO(2)" catalyst prepared by microemulsion method is shown to give higher activity for a water-gas shift reaction but with no formation of CH(4), the side product from hydrogenation of carbon oxides using a hydrogen-rich reformate as compared to conventional "Pt-on-CeO(2)" catalysts. Detailed characterizati…
The overcoating of CdS:Mn nanocrystals by a thin shell of non-doped CdS or ZnS results in remarkably improved photoluminescence properties. The CdS:Mn/CdS and CdS:Mn/ZnS nanocrystals presented in this work (see figure) show a much more efficient Mn-related photoluminescence than the non-coated nanocrystals. These nano…
La-substituted Sr hexaferrite with different La concentrations $x$ were prepared and investigated in order to observe changes in magnetic and structural properties with the substitution. With diffraction methods a change in crystal structure below approximately $100\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ from hexagonal…
The purpose of this research was to develop a system for controlled electrospinning of fibro-porous scaffolds for tissue engineering applications and to use this system to assess mesh architecture sensitivity to manufacturing parameters. The intent was to achieve scaffolds with well-controlled fiber diameters and inte…