Materials Literature
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On the basis of ab initio calculations for Mn-doped GaN, GaP, GaAs and GaSb, we discuss the origin of ferromagnetism in diluted magnetic semiconductors. The calculations use the Korringa–Kohn–Rostoker method in connection with the coherent potential approximation to describe the substitutional and moment disorder. By…
Resonant x-ray scattering (RXS) experiment has been performed for the (3 0 1.5) superlattice reflection in the antiferroquadrupolar and antiferromagnetic phase of DyB2C2. Azimuthal-angle dependence of the resonance enhanced intensities for both dipolar (E1) and quadrupolar (E2) resonant processes has been measured pre…
Mononuclear complexes [Re(bpym)(CO)(3)Cl] and [Pt(bpym)(CC-C(6)H(4)CF(3))(2)] (bpym = 2,2'-bipyrimidine), in which one of the bipyrimidine sites is vacant, have been used as "complex ligands" to prepare heterodinuclear d-f complexes in which a lanthanide tris(1,3-diketonate) unit is attached to the secondary bipyrimid…
A new result enables direct calculation of thermoelastic damping in vibrating elastic solids. The mechanism for energy loss is thermal diffusion caused by inhomogeneous deformation, flexure in thin plates. The general result is combined with the Kirchhoff assumption to obtain a new equation for the flexural vibration…
We report in this paper the studies on protonation, exfoliation, and self-assembly of birnessite-type manganese oxide single crystals. The protonation was carried out by extracting K + ions from the potassium manganese oxide single crystals in a (NH 4 ) 2 S 2 O 8 aqueous solution heated at 60 °C, exfoliation to nanosh…
Here we describe a novel electrochemical biosensing platform based on biocompatible, well-ordered, self-assembled diphenylalanine peptide nanotubes. Voltammetric and time-based amperometric techniques were applied to demonstrate the ability of the peptide nanotubes to improve the electrochemical parameters of graphite…
Rare earth ions (Tm 3+, Er 3+, and Yb 3+ )-doped cubic Gd 2 O 3 nanocrystals were prepared by a simple sol−gel method. Raman and FT-IR spectra were measured to evaluate the vibrational feature of the samples. Under 980 nm laser excitation, blue (488 nm), green (564 nm), and red (661 nm) upconversion has been recorded…
Abstract Recent results have shown that different methods to obtain line integrals for the energies of dislocation loops, and, by extension, of arbitrary dislocation configurations, give different results when a constant core cutoff parameter is used. We show that a self‐consistent choice of different cutoff parameter…
Trigonal $S=1$ NOL1/NIRIM5 center has been characterized by electron spin resonance (ESR) in nickel and boron doped diamond grown by the high-pressure high-temperature technique. Hyperfine interaction structure has been detected and attributed to six equivalent carbon sites and one Ni site. Analysis of the ESR paramet…
We carry out a detailed study of neutral $({D}^{0})$ and charged $({D}^{\ensuremath{-}})$ impurity states of hydrogen-like donors in spherical semiconductor quantum dots. The work is carried out within the effective mass theory, treating many-body effects within the local density approximation and the Harbola-Sahni sc…
Abstract New amphiphilic and lypophilic polymer networks were obtained by the copolymerization of 2‐methyl‐2‐oxazoline (MeOXA), and/or 2‐nonyl‐2‐oxazoline (NoOXA) and 2,2′‐tetramethylenebis(2‐oxazoline) (BisOXA), respectively, initiating the copolymerization by random copolymers of chloromethylstyrene and methyl metha…
Protonated poly(propylene imine) dendrimers (Astramol) of five generations: DAB-dendr-(NH2)x (where x=4, 8, 16, 32 or 64) are sorbed by slightly cross-linked polyanionic hydrogels: poly(sodium acrylate) and poly(sodium 2-acrylamido-2-methylpropane sulfonate). As a result highly swollen original hydrogel transforms int…
UV irradiation of a polyphotochromic molecule bearing a spironaphthoxazine unit linked to a naphthopyran by a Z-ethenic bridge produces several interconverting nonequilibrium dihydrophenanthrenic photocyclized isomers. A quantitative kinetic analysis of the thermal evolution after photocyclization has been performed u…
Abstract The electrochemical and electrocatalytic behavior of electrodes modified with a Co/Al‐NO 3 hydrotalcite (HT) has been investigated and compared with that displayed by Ni/Al‐NO 3 HT modified electrodes. Mono and polyhydric compounds have been tested to study electrocatalysis. At Co/Al‐NO 3 HT modified electrod…
The magnetic phase separation in single crystals of the Pr0.67Ca0.33MnO3 manganites is studied using polarized small angle neutron scattering. The measured spectra give a fractal dimension consistent with a configuration in ferromagnetic filaments of nanometric diameter. We argue here that localized charge carriers ho…
We report a numerical study of the primary crystal nucleation of diblock copolymers in a lamellar phase. Only one of two polymer blocks is crystallizable; the other is maintained in a glassy state. We find that crystals in this lamellar geometry tend to nucleate with the chain axis perpendicular to the lamellar plane.…
A covalently tethered dyad containing the azulene (Az) and zinc tetraphenylporphyrin (ZnP) chromophores has been synthesized and its excited-state dynamics investigated, using the tether-substituted monochromophoric species as reference compounds. One photon excitation of the dyad at 270 nm results in selective popula…
Carbon disulfide, CS 2, mp = 161.7 K, has been crystallized in situ in a diamond-anvil cell at 295 K and 1.26 GPa to give an orthorhombic Cmca structure. No phase transitions occur with further increasing pressure till the polymerization onset at 8 GPa. The crystal structure was determined by direct methods from singl…
Molecular dynamics (MD) simulations were used to characterize the non-cooperative denaturation of the molten globule A-state of human alpha-lactalbumin by urea. A solvent of explicit urea and water molecules was used, corresponding to a urea concentration of approximately 6M. Three simulations were performed at temper…
The short-chain (n approximately equal to 50) homopolymer poly(L-cysteine) (PLC) has been previously studied for use as a novel metal chelator. PLC exhibits reversible oxidation-reduction chemistry involving the thiol groups of the cysteine (Cys) residues. Previously, chemical oxidation of the PLC immobilized on silic…