Materials Literature
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N-(2-Mercaptopropionyl)glycine (tiopronin)-coated silver nanoparticles (average diameter of metal core=5 nm) were prepared by a modified Brust method. Tiopronin ligands were partially displaced by thiolate single-stranded oligonucleotides via ligand exchange. These particles were immobilized onto a solid substrate thr…
Abstract The Thermoluminescence (TL), Blue Stimulated Luminescence (BSL) and Infrared Stimulated Luminescence (IRSL) properties of apatite (originating from Durango, Mexico) are studied. The TL dose response of Durango apatite is linear to an extended dose region whereas the BSL and IRSL dose responses are sublinear.…
We discuss theoretically a novel approach to tailoring the properties of a new family of organic-inorganic hybrid superlattices, using two isostructural materials, ZnSe(en)0.5 and ZnTe(en)0.5, as examples. Replacing Se with Te leads to a number of nontrivial changes: the conduction band parity, singularity type, condu…
Licht bewegt: Die Herstellung flüssigkristalliner Azobenzolelastomerfilme mit vollkommen verschiedener Anordnung der Mesogene durch In-situ-Photopolymerisation wird beschrieben. Bei der Bestrahlung mit UV-Licht biegt sich der Film mit homogener (paralleler) Ausrichtung in Richtung der Lichtquelle, der mit homöotroper…
A strain-dependent random landscape model shows that many aspects of the mechanical response of disordered materials are universal, and arise from the rugged nature of the energy landscape. Simulations with this model demonstrate that states produced by mechanical deformation will generally be distinct from the states…
Swapping structures and cations: In an acid-induced 3D-to-3D transformation at room temperature, K6Cd4Sn3Se13 is converted into K14−xHxCd15Sn12Se46. The [Cd15Sn12Se46]14− framework, which contains a tunnel network of accessible cages of labyrinthine complexity (see picture), is highly robust, acid resistant, and has e…
Polymers adsorbing from a dilute solution onto the solvent-vapor interface generate a nonzero surface pressure. When the same polymers are end-grafted onto a surface such that a so-called polymer brush is formed, one will find that the solvent wets this compound interface partially. The partial wetting and the finite…
Gd + ions were implanted at total doses of 3–6×1014cm2 into single-crystal GaN or AlN epilayers grown on sapphire substrates and annealed at 700–1000°C. The implanted Gd showed no detectable diffusion in either material after annealing, as measured by secondary ion mass spectrometry, corresponding to a diffusion coeff…
Diffusion barrier properties of 10nm Ru sputtered in N and Ar atmospheres have been assessed. N was found to be dissolved in the Ru film deposited in N atmosphere making it amorphous with ten times higher sheet resistance. Annealing caused effusion of N resulting in crystallization of Ru and a sharp decrease in sheet…
Im Roten: Die Synthese und die optischen Eigenschaften homologer, im Nah-IR absorbierender Chromophore vom Leitertyp werden vorgestellt: von zwei Pentarylenbis(dicarboximiden) (grüne Spektren; siehe Bild) und einem Hexarylenbis(dicarboximid) (gelbes Spektrum). Wie die übrigen Spektren belegen, führt eine zunehmende An…
Abstract Hydrotalcites with phosphate in the interlayer were prepared at different pH values. At pH > 11.0 (PO 4 ) 3− was the intercalated ionic species, whereas at pH < 11.0 a mixture of (PO 4 ) 3− and (HPO 4 ) 2− ions was intercalated. Powder X‐ray diffraction shows that the hydrotalcite formed at pH 9.5 is po…
Eutrophication of the Baltic Sea has become a serious concern in recent decades. To provide a potential means for quality assessments of coastal waters in this area, we collected a data set of 49 embayments in the Gulf of Finland, and explored the relationship between surface sediment diatom assemblages and 15 environ…
The compression behavior of the hexagonal $MAX$ phases ${M}_{2}\mathrm{Al}\mathrm{C}$ ($M=\mathrm{Ti}$, V, Cr, Nb, and Ta)---selected because they represent two series; a horizontal series in which the atomic number of the $M$ element increases from 23 to 25 and a vertical series where the $M$ element (V, Nb, or Ta) b…
Photoluminescence (PL) properties of ZnO thin films on Si substrate with and without an indium tin oxide (ITO) buffer layer, prepared under different oxygen partial pressures in the sputtering gas, were studied. It was found that PL characteristics of ZnO thin films depend on oxygen partial pressure and substrate, and…
Nitrile butadiene rubber (NBR) structure foam of different apparent densities was obtained by using different concentrations of foaming agent, azodicarbonamide, ADC/K. The true stress–strain characteristics, in case of compression, of foamed samples were measured. It was found that the theoretical values predicted fro…
Monitoring self-assembled objects: Optical studies and scanning confocal microscopy have been used to monitor intermolecular energy transfer (ENT) in mixed vesicles of donor/acceptor oligo(p-phenylene vinylene)s (OPVs) in water (see picture) over time. This probing of the ongoing exchange process between separate dono…
We report on the existence of acoustic emission during the paramagnetic-monoclinic\ensuremath{\leftrightarrow}ferromagnetic-orthorhombic magnetostructural phase transition in the giant magnetocaloric ${\mathrm{Gd}}_{5}{\mathrm{Si}}_{2}{\mathrm{Ge}}_{2}$ compound. The transition kinetics have been analyzed from the det…
In this article we use a geometric approach to study geometric phases in graphitic cones. The spinor that describes the low energy states near the Fermi energy acquires a phase when transported around the apex of the cone, as found by a holonomy transformation. This topological result can be viewed as an analogue of t…
The electron paramagnetic resonance investigations of the magnetically concentrated crystal of KYb(MoO4)2 have been performed. The main value of g-factors along principal local axes was determinate. The two nonequivalent Yb3+ centers were found in ac-plane. It is shown that local symmetry of Yb3+ ion in ac-plane is no…
The issue of how to define and determine an optimal acoustical fit to a set of anisotropic elastic constants is addressed. The optimal moduli are defined as those which minimize the mean squared difference in the acoustical tensors between the given moduli and all possible moduli of a chosen higher material symmetry.…