Materials Literature
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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.…
We report the temperature dependent mid- and near-infrared spectra of K4C60, Rb4C60 and Cs4C60. The splitting of the vibrational and electronic transitions indicates a molecular symmetry change of C604- which brings the fulleride anion from D2h to either a D3d or a D5d distortion. In contrast to Cs4C60, low temperatur…
In the red: The synthesis and optical properties of homologous ladder-type near-infrared-absorbing chromophores, namely, two pentarylenebis(dicarboximide)s (green traces; see picture) as well as a hexarylenebis(dicarboximide) (yellow trace) have been studied. A strong bathochromic shift of the absorption maximum is no…
We present the theoretical and detailed experimental characterizations of photothermal heterodyne imaging. An analytical expression of the photothermal heterodyne signal is derived using the theory of light scattering from a fluctuating medium. The amplitudes of the signals detected in the backward and forward configu…
Abstract Both Raman and infrared spectroscopy have been used to characterise the three phase‐related minerals—dreyerite (tetragonal BiVO 4 ), pucherite (orthorhombic BiVO 4 ) and clinobisvanite (monoclinic BiVO 4 )—and a comparison of the spectra is made with that of the minerals namibite (Cu(BiO 2 )VO 4 (OH)), schuma…
Abstract Cotton fabrics were treated with montmorillonite (MMT) so as to improve the wrinkle‐resistant properties of the cotton fabrics. The MMT in emulsion form was applied by padding method to the cotton fabrics, and the wrinkle‐resistant properties of the MMT‐treated cotton fabrics and the wrinkle‐resistant propert…
In this work we review the physical motivations, both experimental and theoretical, suggesting the possible use of quasicrystals as thermoelectric materials. Analytical expressions for the dimensionless thermoelectric figure of merit and the compatibility factor are discussed in order to optimize the thermoelectric pe…
Abstract Uniform polystyrene (PSt) particles with the size of 1.9 μm were first prepared via dispersion polymerization, and then used as the seeds in a second‐stage dispersion copolymerization of styrene (St) and methacrylic acid (MAA) to produce carboxyl‐carrying microspheres. The PSt seed particles were swollen by m…
Electrically insulating films of Al 2 O 3 were deposited using thermal spray technology followed by the sputter deposition of a strain gauge pattern using shadow masking techniques. For the first time, a thin film strain gauge of chromium was successfully fabricated on thermally sprayed Al 2 O 3 insulation. X-ray diff…
The µ3, µ5 and µ7 approximants in Mg-Zn-RE were related in real and reciprocal space. The structure factors of µ3, µ5 and µ7 have quite similar intensity distributions and identical phases for the strongest corresponding reflections. Structure models of any of µ3, µ5 and µ7 can be obtained from any of the others using…