Materials Literature
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We study the influence of a substrate on the surface plasmon resonance absorption in silver nanoparticles depending on the distance between the nanoparticles and the substrate. The experimentally observed red shift of the resonant absorption is explained in the frame of the image-induced charges at the interface betwe…
The magnetic ground state of antiferromagnetically coupled Gd/Fe multilayers and the evolution of in-plane domain walls is modelled with micromagnetics. The twisted state is characterised by a rapid decrease of the interface angle with increasing magnetic field. We found that for certain ratios M(Fe):M(Gd), the twiste…
Electronic states and magnetic properties of single $Mn$ impurity and dimer doped in narrow-gap and wide-gap $III$-$V$ semiconductors have been studied systematically. It has been found that in the ground state for single $Mn$ impurity, $Mn$-$As(N)$ complex is antiferromagnetic (AFM) coupling when $p$-$d$ hybridizatio…
Electron transport properties in nanostructures can be modeled, for example, by using the semiclassical Wigner formalism or the quantum mechanical Green's functions formalism. We compare the performance and the results of these methods in the case of magnetic resonant-tunneling diodes. We have implemented the two meth…
We report the response of electrical resistivity $ρ$ to the application of magnetic fields (H) up to 140 kOe in the temperature interval 1.8-300 K for the compound, Gd7Rh3, ordering antiferromagnetically below 150 K. We find that there is an unusually large decrease of $ρ$ for moderate values of H in the close vicinit…
We present results of variational calculations of the binding energy of a neutral donor in a quantum well in the presence of a magnetic field tilted relative to the QW plane. Assuming that the donor is located in the center of the QW, we perform calculations for parameters typical of a II-VI wide-gap semiconductor het…
In this Letter we show that the extraordinary optical transmission phenomenon found before in 2D hole arrays is already present in a linear chain of subwavelength holes, which can be considered as the basic geometrical unit showing this property. In order to study this problem, we have developed a new theoretical fram…
The evolution of static dielectric constants and polarization with doping are analyzed and discussed using established experimental results. The variation of screened Coulomb potential with doping is derived theoretically to justify the said evolutions. The latter justification arises due to the influence of ionizatio…
The magnetism of the Fe/Cr/Sn/Cr multilayers was studied by first-principles functional theory. The calculations by LAPW and SKKR methods showed that two solutions exist in the $Fe_9/Cr_{14}/Sn/Cr_2$ system. One of them is originated from the antiferromagnetic order in the bulk Cr, and the other is connected with inco…
You only need eyes to appreciate the color change that occurs in a polymer matrix when the bistable rotaxane shown is switched between its ground-state (green) and metastable-state (red) co-conformers. Not only is an electrochromic device within reach, but a universal switching mechanism seems to be on the cards.
A new contrast agent for MRI based on recombinant HDL-like nanoparticles has been prepared. It shows a great potential as a contrast agent for atherosclerotic plaques in a relative short time (24 h post-injection) as it is selective for the plaques and is an endogenous molecule. It also can distinguish between differe…
The elastic constants of the ${\mathrm{Ti}}_{1\ensuremath{-}x}{X}_{x}$ ($X=\mathrm{V}$, Nb, Ta, Mo, and W) and ${\mathrm{Zr}}_{1\ensuremath{-}x}{X}_{x}$ ($X=\mathrm{Nb}$ and Mo) binary alloys were calculated for $x=0.0$, 0.25, 0.5, 0.75, and 1.0 by the ultrasoft pseudopotential method within the generalized gradient a…
Abstract The effect of selected borates [i.e., tri(hydroxypropyl) borate (BTHP), tri[(3‐chloro‐2‐hydroxy‐1‐propoxy)propyl] borate (BTClHPP), and tri[(3‐chloro‐2‐hydroxy‐1‐propoxy)‐1‐methylethyl] borate (BTClHPME)] on the heat and thermal properties of the rigid polyurethane–polyisocyanurate foams was investigated. Inc…
Abstract Polymer films developed for distance detection, containing dye‐coated silver particles for ultra‐sensitive analysis using surface‐enhanced resonance Raman scattering (SERRS), identified the need for effective SERRS labels that interact strongly with the metal surfaces. Many dyes that are currently used for SE…
Abstract A series of alternating aliphatic poly(amide‐ester)s, derived from dicarboxylic acid and aminoalcohols, were obtained by polycondensation in melt. All poly(amide‐ester)s were characterized by FTIR and 1 H/ 13 C‐NMR spectroscopies. The synthesized polymers showed an inherent viscosity ranging from 0.4 to 1.0 d…
nu-Dysprosium borate (nu-DyBO(3)) was synthesized under conditions of high temperature and pressure in a Walker-type multi-anvil apparatus at 3 GPa and 1323 K. The compound is isotypic with the already known nu-samarium and nu-europium orthoborates.
A new type of atomization interference, caused by traces of oxygen in gases supplied to the atomizer, has been identified in three different types of miniature flame hydride atomizer for atomic fluorescence spectrometry, namely argon–hydrogen diffusion flame (MDF), flame-in-gas shield (FIGS) and double flame (DF), whi…
Phasenänderungen erhellt: Die Absorption von Röntgenphotonen löst in dem gemischtvalenten Mn/Fe-Cyanid Rb0.7MnII1.15[FeIII(CN)6]⋅2 H2O über einen großen Temperaturbereich interne Charge-Transfer-Prozesse aus. Dabei treten kontinuierliche wie abrupte Phasenänderungen auf (siehe Schema; HS=high spin, LS=low spin). Da di…
Eine hellere Zukunft für Silole: Lumineszierende Silolchromophore mit den höchsten Quanteneffizienzen für vollständig substituierte monomere Silole entstehen durch Variation der sterischen Eigenschaften der Substituenten. Behandelt man die 1,1-Dimethylsilole bei Raumtemperatur mit Bu4NF (TBAF) in THF, werden sie schne…
Recently, the Istituto di Metrologia 'G Colonnetti' (IMGC) and the National Metrology Institute of Japan (NMIJ) reported joint measurements of the (220) lattice plane spacing of Si. These measurements were carried out at both the IMGC and the NMIJ to resolve a discrepancy between previous determinations. It has been f…